Acrylic glue bunnings: Weldbond 60ml Universal Adhesive – Blister Pack

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Which Glues Work for Polycarbonate Plastic

Polycarbonate is a modern plastic material with many beneficial properties, namely its high optical clarity, and great durability. It is visually similar to glass, but thirty times more impact-resistant, making it as strong as some metals. Consequently, there are many use cases for polycarbonate, such as a replacement for security windows, or tiny non-conductive parts for machinery.
 
Regular solvents won’t adhere to polycarbonate. In fact, standard household glues may cause polycarbonate to undergo “crazing,” which occurs when chemicals break down the polymer’s microscopic bonds, causing small, crack-like streaks. While this won’t damage the polycarbonate significantly, it will create an unseemly appearance.
 
Thankfully, there are many effective methods for gluing, or fusing, polycarbonate plastic. Gluing and fusing are not exactly the same, however. While glues leave an adhesive behind, fusing causes a chemical reaction that allows the polycarbonate to melt back together. This is similar to the processes used to glue acrylic plastic.
 
Each of these bonding and fusing agents have different chemical properties, which may be ideal for different use cases. Let’s go over four common methods used to repair, bond, or fuse polycarbonate plastic.

 

How to Prepare Polycarbonate Plastic for Gluing

Before polycarbonate can be glued, it’s important to ensure it is free of contaminants. First, rinse the polycarbonate with lukewarm water to remove any dirt, sand, or other hard materials that could damage the polycarbonate by scraping against it. Then, combine lukewarm water with a small amount of dish soap. Dip a clean sponge or cloth into the mixture, and gently rub the polycarbonate to remove any small contaminants. Then, rinse the polycarbonate again. At this point, your polycarbonate will be ready for gluing.
 

Gluing Polycarbonate with Methyl Methacrylate

The most commonly recommended way to fuse polycarbonate is with methyl methacrylate since it creates a strong, resilient bond. Some users have found that if they try to mechanically pull polycarbonate apart, the unaltered polycarbonate will break before the bond will! However, this product is rather niche, and may not be readily available unless the user orders it online ahead of time.
 

 
When applying methyl methacrylate, make sure you’re either outdoors, or in a very well-ventilated room. The fumes from methyl methacrylate can be toxic if inhaled in high concentrations. Then, follow these steps:

  1. Take a clean piece of polycarbonate, and lightly apply the methyl methacrylate to the area you’d like to join.
  2. Let the methyl methacrylate soak for a minute. Give it a light tap with a clean piece of metal or wood – if the plastic feels sticky, it’s ready to bond.
  3. Attach the polycarbonate to another piece of polycarbonate, and hold them tightly until they can support their own weight. The timing may vary, but this should take about five minutes.
  4. Once the polycarbonate can support its own weight, let it set for 48 to 72 hours. Then, it should be fully joined.

Gluing Polycarbonate with Superglue

Superglue, also known as a cyanoacrylate adhesive, is another effective way to join polycarbonate. Although methyl methacrylate makes a better quality bond, superglue is much more accessible to the average user. It also bonds faster than methyl methacrylate, making it ideal for quick fixes.
 
When bonding polycarbonate with superglue, make sure that you’re working in a well-ventilated room. The fumes from cyanoacrylate can be toxic if they are inhaled in high quantities. Don’t apply too much superglue, as it can cause adverse chemical reactions like crazing or blooming. Finally, do not submerge any polycarbonate that is bonded with superglue, since this will cause the superglue’s bond to weaken.
 
When bonding polycarbonate with superglue, follow this procedure:

  1. Apply the cyanoacrylate to a clean sheet of polycarbonate on the edges that will be joined.
  2. The adhesive will be ready to bond immediately – within a minute of applying the glue, hold the pieces of polycarbonate together until it can support its own weight. This may take a minute
  3. Let the superglue dry for 48 hours before putting any significant pressure on it.

Using Epoxy to Glue Polycarbonate

Epoxide glue, also known as epoxy, is a simple way to glue polycarbonate together. This is commonly used for quick fixes, or for bonding the polycarbonate to materials like ceramic. While epoxy is suitable for some use cases, it’s not necessarily the best general gluing method. It is likely to leave marks from its application, and only provides a slightly stronger bond than superglue. Epoxy is not recommended for outdoor use since it will yellow with continued exposure to UV rays.
 
Gluing polycarbonate using epoxy is rather simple. Just follow these steps, and make sure you are outdoors or in a well-ventilated room:

  1. If using two-part epoxy, mix the two parts together by following the instructions on the back of the packaging.
  2. Apply epoxy to a clean part of the polycarbonate that you would like to glue.
  3. Hold another piece of polycarbonate to it for about five to ten minutes, or until the bond is firm.
  4. Allow it to sit for 72 hours before putting it under any stress. It may take up to a week for the epoxy to fully dry.

Bonding Polycarbonate with Polyurethane

You can bond polycarbonate with another kind of plastic: Liquid polyurethane. Polyurethane is ideal for low temperatures – as low as -40F – as it will not become as brittle as other forms of adhesives. It’s also highly resistant to many kinds of chemicals, like gas, oil, and salt. If you’ve ever used classic, brand-name Gorilla Glue, then you’ve used polyurethane glue before.
 
While the bond will not be totally clear, or as strong as methyl methacrylate, many people are drawn to polyurethane due to its physical properties. To glue polycarbonate using this material, make sure you’re in a well-ventilated area. Then, follow this procedure:

  1. Apply the glue to a clean section of the polycarbonate using the applicator or a foam brush.
  2. Hold the polycarbonate together until it begins to join – this may take a few minutes.
  3. Once it can support its own weight, leave it to dry for 24 to 48 hours. Even if the polyurethane is dry, it is not yet ready for demanding use cases.
  4. After about a month, the polyurethane will be perfectly cured and hardened, allowing it to withstand regular use without splitting.

Final Thoughts

Whether you’re looking to create a structure out of polycarbonate, or you’d like to repair a cracked polycarbonate panel, the process to glue polycarbonate is simple. However, each method has its own strengths and weaknesses, think about which kind of bond will be most beneficial to your use case. With the right gluing process, your polycarbonate product will stay sturdy for years to come.
 
Looking to purchase polycarbonate for your next project? Take a look at our selection of polycarbonate products, or contact us for custom orders.

Mosaic Glues – Mosaic Art Supply

Choosing the right adhesive for your mosaic

Picking the correct adhesive or glue is a very important decision when starting a mosaic, possibly the most important. If you choose the wrong one, your mosaic will not last as long as it should.

The best way to make a decision is to understand the different choices of adhesives and which ones works better with certain surfaces and tesserae. The primary deciding factor will be where the mosaic will live once it is complete: indoors or outdoors.

Indoor mosaic glue

Most mosaics intended for indoor use such as this mirror can be made using Weldbond and sanded grout.Weldbond Adhesive 160ml (5.4oz) the best mosaic glue made.

Weldbond is the best. It’s a water based PVA glue, has no fumes, dries clear and water resistant, bonds to most any surface, is non-toxic and cleans up easily. We’ve extensively tested it, which you can read about here. However, I prefer to use thinset bonding mortar for floors. It gives a more stable and durable walking surface and better resists water seepage when cleaning the floors.

Outdoor mosaic glue

Thinset is the best adhesive for outdoor mosaics such as this garden stone.

In choosing adhesive for outdoor mosaics, it’s probably best to avoid adhesives altogether and use thinset mortar (a sticky concrete with added polymers) instead. To use thinset, you should read and follow the instructions on the package for mixing, handling and disposal. We also have a guide to using thinset. In brief, thinset is like grout and other concrete products. This means that the best place to mix them up is outside, and you should wear a dust mask if have trouble mixing it up without creating a lot of dust. (Our artists merely stand upwind and mist it with a spray bottle until they get it mixed up.)

I usually mix up about 1 or 2 pounds at a time and smear it on the wall with a small trowel or putty knife. I spread it out to about 1/8″ to 1/4″ thick and press my mixed materials directly into the concrete. I wear rubber examination gloves and keep a damp rag so I can wipe away any excess that squeezes up to the face of the tiles. If you keep the concrete in the bucket covered so that it doesn’t dry out, then it should stay workable for several hours. I made the mosaic columns at the gallery using thinset mortar in this way. I always keep a small bucket with a little water and rag to clean my hands from time to time and a dry rag in my lap.

See our illustrated grouting tutorial for more details.

At this time, we no longer recommend using a construction adhesives in an outdoor environment. Use adhesives other than thinset at your own risk.

Read more about outdoor mosaic considerations.

Glue for marbles and round stones

Marbles and round stones can be a challenge. Unless they are being pressed into cement face-up on a horizontal surface like stepping stones, the right adhesive choice is important. You may be able to use a thick cosntruction adhesive for this purpose, though it isn’t recommended to do this for outdoor mosaics. It is probably best to use thinset in these cases.

Understanding Different Types of Mosaic Adhesives

PVA Glues

PVA glues like Welbond are water soluble adhesives that will clean up with water. PVA glues should not be used on any outdoor project. Even if it isn’t exposed to rain, humidity can also loosen the bond. When working in the indirect method, PVA glue can be used to adhere tiles to fiberglass mesh. It also bonds well with any type of tile and wooden or acrylic surfaces. Again, Weldbond is the best and it dries clear.

Thinset Mortar

Thinset is a sticky cement which can be messy to work with, but it is necessary for outdoor projects if you want them to hold up. It can be found at any hardware store, and is often only sold in large quantities. The best surfaces for thinset are porous, such as cement, cement backerboard, and wood and terracotta. To use with non-porous surfaces like glass, the thinset has to be mixed with admixes instead of water, which are either latex or acrylic liquids that make the thinset sticky. Premixed thinset is not as good as dry mix.

Stained glass was glued with clear silicone to square pieces of clear glass to make these sun catchers.Silicone

Silicone is used most often on glass surfaces because it comes in transparent varieties. It usually comes in a caulking tube and can take some time to get used to. It is difficult to remove and if you apply too much, it will come up between the tiles and make grouting more difficult and incomplete. When used under larger sheets, the areas towards the inside may never cure completely.

Epoxy

Epoxy is used on metal surfaces, but works on wood and glass also. It can hold up outdoors in ideal conditions, but it is very difficult to use and has a noxious odor. Once it is mixed, it must be used quickly. But when it is used successfully and correctly, it is a very strong adhesive and it dries clear.

Other Glues

In speaking with other mosaic artists, you will likely find that everyone has their own preferences for adhesives and that they are used in different ways from artist to artist. Understanding the characteristics of each type of adhesive will help you in finding the best solution for you in your various projects. When working with a new glue, be sure it is what you need for your project. Is it for interior or exterior, is it toxic, and will it work with your surface? Other than Welbond, the most popular brands for mosaics are Liquid Nails, MacGlue, and Gorilla Glue. Once you’ve experimented with several types of adhesives, you will get a feel for what you prefer and what works best.

NOTE

Always clean up excess glue before you grout. After water soluble glue has dried for a day or two, I come back and mist the mosaic with water. After about 10 minutes, any traces of glue that are sticking up on the sides of the tile will start to turn white. I then take a razor knife like a box cutter or exacto knife and trim away the excess glue. This cleaning step ensures that there will be no glue sticking up and not covered by grout.

Loctite plastic glue bunnings. Top 14 Best Glue for Plastic in 2020

For interior applications, apply and cure in a well ventilated area. Wear gloves and wash hands after use. Surfaces must be clean, dry and free from oil, wax and paint. Roughen smooth surfaces for better adhesion. Pre-fit parts to be joined. Pierce the seal in the head of the tube using the reverse end of the cap.

Wet Bonding Instructions: Apply evenly to both surfaces and press surfaces together. Hold parts together until set. The assembly can be repositioned while the adhesive is still wet. Wipe excess adhesive away before it sets. For repairing small tears and rips: Apply to the edges of the damaged areas. Press both edges together and secure with masking tape for approximately 10 minutes.

For repairing large tears and rips: Place a cloth or Fiberglass patch under the damaged area for extra strength.

J-B Weld Plastic Bonder – World’s Strongest Bond

Apply product to the edges of the damaged area. Secure the repair with masking tape for approximately 10 minutes. Contact bonding Instructions: Apply evenly to both surfaces.

Let dry for 10 to 30 minutes or until dry to the touch. On porous surfaces, apply a second coat and allow to dry. Assemble parts within 30 minutes.

Super Glue

Uncured adhesive can be removed using acetone or mineral spirits Caution: Acetone may damage some plastics. Cured adhesive may be cut away using a sharp blade with caution or removed with acetone. It dries to a transparent and waterproof bond. It will not yellow or go brittle with age or sunlight. Key Facts. Recommended on Also repairing household items such as, shoes, toys, tools and weather stripping Repairing seat covers, beach balls, vinyl inflatable mattresses, vinyl upholstery, raincoats and wading pools Bonding paper, glass, leather, wood, fabric, rubber and some plastics.

Step 2: Preparation Surfaces must be clean, dry and free from oil, wax and paint. Step 3: Application Wet Bonding Instructions: Apply evenly to both surfaces and press surfaces together. Wait for a full cure of 24 hours before exposure to water.

Step 4: Cleanup Uncured adhesive can be removed using acetone or mineral spirits Caution: Acetone may damage some plastics.Glue is an essential part of modeling.

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However, picking the best glue for plastic models can be a difficult task. Most people barely have the correct information to settle on a particular adhesive for their plastic models. If you need to stick your plastic models and they stay put until either someone removes them or their adhesive force weakens hence they fall off after an extended period, you do not need to worry.

Here, you will get a comprehensive guide that should help you settle on the best glue for plastic models. You will find a review of 5 of the best products you may use and a comprehensive guide that should help you compare hence settle on the ideal product for you. This might be one of the best cement to use.

The glue comes in a tiny cubed glass jar with a bright green lid. The liquid is subtle. The cover has a small brush and offers an original method of sticking plastics with glue. You can use this adhesive to connect plastic parts from polystyrene, from which almost all sprues are made. Capillary action powers this glue. Capillary action is a feature of Tamiya Extra Thin Cement that generally causes it to pull into tiny cracks and gaps.

The capillary action is brought about by surface tension between the molecules of the glue. Tamiya Extra Thin Cement uses the force to fill the cracks between the plastic surfaces that are being put together.

You ought to take appropriate care as if too much of the glue loads up, and it might find a seam and a crack on the plastic model and run through it. This might be quite messy. A little amount of this glue can form a strong bond. Therefore, you should use it sparingly. The adhesive has powerful chemicals, and it is quite thin. The capillary action does work in reverse on your plastic. The glue takes a few minutes to completely dry.

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The capillary action may also allow you to be quite precise when bonding your plastics. The glue should also not be taken internally. It should be kept away from kids.

You should also avoid it making contact with your eyes or skin. You should not use it with an elastomer as it can cause brittleness.Your question may be answered by sellers, manufacturers, or customers who purchased this item, who are all part of the Amazon community.

Please make sure that you are posting in the form of a question. Please enter a question. The key to success is our 2 part system with activator to prime the surface prior to gluing plastic together. Works on all plastics including hard-to-bond polyethylene and polypropylene. Plus rubber, leather, cork, paper, cardboard, wood, chipboard, fabric, metal and ceramic. Priming activator with slanted felt tip prepares plastic surfaces for permanent bonding.

One minute after applying activator, use super glue sparingly on one surface, press together and hold for 30 seconds; it develops tremendous strength with just one drop.

Product Type: -Plastic Adhesives. Dimensions: Overall Height – Top to Bottom: Overall Width – Side to Side: -8 Inches. Overall Depth – Front to Back: Overall Product Weight: For over 50 years, Loctite has provided customers with advanced adhesive and sealing solutions. The Loctite Plastics Bonding System is a two-part cyanoacrylate adhesive that sets in seconds and develops tremendous strength with just one drop.

The activator primes hard-to-bond surfaces such as polypropylene and polyethylene. It is resistant to water, most chemicals and freezing temperatures.

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Our uncompromising level of quality and innovation is achieved through a strong commitment to research and development. This commitment to innovation, quality and reliability has truly earned Loctite the reputation of delivering “Trusted Performance.

Proven Results”. Skip to main content. Free day shipping within the U. Prices may vary for AK and HI. We will ship this item as soon as we can and email you a confirmation when it ships. Learn more.

In Stock. Qty: 1 2 3 Qty: 1. Add to Cart. Secure transaction. Your transaction is secure. We work hard to protect your security and privacy.

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Our payment security system encrypts your information during transmission. Ships from and sold by Amazon. Loctite Super Glue PlastiPlastic can be an extremely flexible and durable material, one suited exceptionally well for all sorts of home projects.

Luckily, however, there are a few common adhesives out there – some specially engineered for plastic, some not – that can get the job done. As you might guess, this product has been designed to bond exceptionally well with plastic. Though the mixing for epoxies can be tricky and messy – one must blend the resin and the catalyst in equal parts to create a proper adhesive – JB Weld cuts down on the hassle by deploying their product with a double plunger that dispenses both elements simultaneously.

If you wish, you can also order PlasticWeld in a simple tube whose dispersion allows for hand mixing. While this product works beautifully with most varieties of plastic, please be aware that there are certain types – including polyethylene and polypropylene sheet – that it will not adhere to.

This super glue is released by Eclectic Products, Inc. True to its namesake, it can also be a bit messy and goopy, which might not make it the best choice for delicate applications.

The Trim Repair and Automotive varieties advertise their ability to work with plastics, so those types are likely your best bet. Its Plastics Bonding System offers the resin and activator of an epoxy in small, separate tubes with precise applicators, making it an excellent choice for jobs that require a degree of delicacy. The Epoxy Plastic Bonder, meanwhile, is similar to PlasticWeld in the sense that it contains both elements of an epoxy in one tube with a double plunger for easy, mess-free mixing.

If you need just one adhesive for one project, it may be wise to go with one of these specialized formulas. Acrylic is one of the most commonly used plastics in home craft projects; it also reacts extremely poorly to Super Glue. A chemical burn can be caused by the glue and the acrylic sheet coming into contact with one another, one that may cause extensive white clouding within the plastic. Though Super Glue can be removed with acetone, that chemical – as luck would have it – also creates a reaction in acrylic in the form of significant scratching.

Loctite® Glass Glue

The usage of adhesives, however, poses particular challenges. For one, both temperature and humidity can play a large role in whether an adhesive will bond to a material. If possible, make sure that your work environment is between 70 and 75 degrees Fahrenheit and that there is relatively little humidity in the air. Also, many adhesives are extremely flammable. If you do your research and take the necessary preparation, adhering plastics can be just as easy as gluing wood.

Still have questions about working with plastic? Our friendly and knowledgeable customer service representatives are always available to address any concerns you might have.

Polypropylene sheeting also possesses a very favorable strength to weight ratio. Acrylic sheeting, commonly referred to as plexiglass sheeting, is the most common alternative to traditional glass.Whether you need to glue PVC pipes to fix your plumbing or add some glitter to your favorite pair of flip-flops, getting the best glue for the job will make your project a greater success and will make it last longer.

There are many different types of plastic and not all glues will work on all plastics. Even though the glue bottle says that it is approved for plastic, it does not necessarily mean that it will work on every type of plastic. Choosing the right glue for the job will save you frustration and assure that you are happy with the result. The following table summarizes the qualities of the different types of the best glue for plastic in this review.

The Difference Between Red, Blue, Green and Purple Threadlockers

Pratley Plastic Glue made the list because it is one of the few plastic adhesives that can be used on plastic automotive parts such as headlights, radiators, and dash components. It will work on most plastics, glass, fiberglass, and metal. It can be used on ABS plastic, unlike many types of glue. This glue also fills in gaps and cracks easily.

It is suggested that you store the glue in the refrigerator after opening to keep it from getting old quickly. Once it has cured, it can be sanded, painted, or drilled. Duco Cement is a great multipurpose household glue that can be used on many different surfaces.

It dries quickly and is set in about 5 to 10 minutes. It dries tough and is water resistant. Another thing we liked about this glue is that it resistant to gasoline, mineral spirits, corn oil, and other solvents. This means that you can use it on surfaces that will be cleaned with the solvents and the glue will not be harmed, such as painted surfaces.

This glue is made from nitrocellulosewhich makes it last longer before drying out if the cap is carefully replaced after each use. This glue was thick and easy to apply. This means that you can get an accurate placement of the glue. We also found that this glue was easily removed from the skin if you allow it to dry and then peel it off.

Overall, we felt that this was a good all-purpose glue that would be suitable for many projects. Pros Water resistant Resistant to solvents Thick and does not run quickly when applying Cons Not recommended for areas that will be in contact with food Highly flammable when wet Does not set as quickly as superglues. E is a household glue that has been around for a long time. It is a favorite because it dries white and can be used on many different services. One of the things that we did not like about E is that it takes about five minutes to set.

However, this can be an advantage, because it allows you some time to make adjustments before the glue sets.Please allow us to set Cookies. There are some features on our websites that may not work without Cookies. To find out more about the Cookies we use, social media plug-ins and web tracking please visit our Cookie Information Page and the Data Protection Statement. Ideal for large to medium surfaces providing fast initial tack and the ability to fill gaps in interior and exterior applications.

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Our line of versatile construction adhesives to meet all your project needs. All with legendary 0 second instant grab. Instant bonding in small projects and repairs that reduces the need for nails and screws.

Our professional line of adhesives providing superior bonding for all of your building needs. Bonds that last as long as the material they are joining together. Strongest bond to most materials. Ideal for any project where long term strength and durability are a must. Designed for the Pro – for those specific jobs that require the quality expected from the PL line.

Exceptional holding power for a wide variety of building materials. Bridge minor gaps when bonding irregular surfaces. Here are some tips and tricks that will help you get your home improvement, repairs or job done more quickly, more safely and with less stress. Cookie Policy Please allow us to set Cookies. Read more. Loctite Products Build Construction Adhesives.

Construction Adhesives Ideal for large to medium surfaces providing fast initial tack and the ability to fill gaps in interior and exterior applications.

Where to buy? Help me choose a product. Read More.Surfaces must be clean, dry and free from oil, wax and paint. Roughen smooth surfaces with grit sandpaper prior to cleaning. To clean surfaces, wipe with rubbing alcohol. Pre-fit parts to be joined. Remove the plug from between the piston. Cut off the end tips of the syringe. Turn syringe end up and pull plunger back slightly allowing air bubbles to rise to top.

Press the plunger to dispel the air. Depress the double piston to dispense equal parts of the two materials on a disposable surface. Mix both components thoroughly until a uniform color is achieved. Wipe syringe tips clean, retract piston slightly and close with the plug.

Ensure that the plug is always placed in the same orientation on the tips. Apply a small amount to both surfaces, join and press together. Support parts until bond sets in approximately 20 to 25 minutes at room temperature. After the fixture time is achieved the material has reached handling strength.

Remove any excess uncured adhesive immediately using mineral spirits, isopropyl alcohol or denatured alcohol. The convenient double syringe dispenses equal amounts of each component every time. When mixed in equal volumes, the components react to produce a tough, rigid, high strength bond in 20 to 25 minutes. Loctite Epoxy Plastic Bonder does not shrink and is resistant to water, most common solvents and shop fluids.

It has high impact resistance and can be sanded and drilled. Key Facts. Wear gloves and wash hands after use. Step 2: Preparation Surfaces must be clean, dry and free from oil, wax and paint. Step 3: Application Apply a small amount to both surfaces, join and press together. Step 4: Cleanup Remove any excess uncured adhesive immediately using mineral spirits, isopropyl alcohol or denatured alcohol.

Is Super Glue Food Safe? – The Truth

*This post may contain affiliate links. Please see my disclosure to learn more.

Super glue is an effective adhesive that is commonly used to repair broken items.

If you need to repair kitchen utensils and food-related items such as cutting boards, wooden spoons, and other items, you might wonder about the safety of using super glue for such repairs.

Is super glue food safe? No, super glue is not-food safe; it contains the toxic ingredient cyanoacrylate. However, there are some strong, food-safe adhesives without cyanoacrylate which you can use to repair kitchen items.

We will find out why super glue is not food-safe in this article and also go over some food-safe glue alternatives that you can use on kitchen items.

First, let’s learn more about the type of glue that is referred to as super glue. 

What is Super Glue?

Super glue, or cyanoacrylate adhesive, is a strong, fast-bonding adhesive that can bond to almost any surface and material. They’re commonly used for quick home repairs such as fixing cracks and broken items. They’re very easy to use and offer high resistance to moisture and temperature.

Super glue forms a really strong, long lasting bond when fully cured. It also sets in just a few seconds and requires just a few drops to create an extremely rigid bond. Super glue can be used with metal, wood, plastic, glass, stone, ceramic, paper, and many other common items.

Super glue was discovered in 1942 by Harry Coover Jr. It began to be produced commercially by Loctite in 1958. It quickly grew in popularity and is now manufactured by other popular brands including Gorilla, Elmer’s, Infinity Bond, and Permabond.

How Does Super Glue Work?

The major ingredient in super glue, which is responsible for its bonding properties, is cyanoacrylate. Cyanoacrylate is an acrylic monomer that cures to a plastic state when it comes into contact with hydroxyl ions in moisture in a process known as anionic polymerization. 

Super glue, therefore, only requires water molecules to bond. As a result, it can bond to virtually every surface as long as moisture is present. Since moisture is always present in the air, super glue can be used on almost any surface.

Super glue products generally have a very short bonding time. A side effect of this, though, is that you have less time to get things aligned properly.

While this may be inconveniencing in some cases, it can be very beneficial if you’re working in a cramped space or on surfaces that are hard to reach. Short bonding times could mean having to stay in an uncomfortable position for much shorter than otherwise.

Since super glue bonds with the aid of moisture, the bonding process tends to be faster in environments with higher humidity. Since they also do not require mixing with any other substance to harden, you don’t have to worry about mixing precise combinations of different ingredients to get a solid bond.

Different kinds of super glue are designed for different surfaces. For example, some super glue products feature a gel-like substance which works great for surfaces like wood.

Plastic surfaces tend to give adhesives a tough time due to their low porosity and smooth texture. However, super glues designed for plastic materials overcome these challenges and produce reliable bonds.

Thus, it is a good idea to read the label on a super glue product you’re planning to purchase to see what surfaces it works best on. If you can’t tell whether a glue you’re looking at is super glue, check the ingredient labels. If it doesn’t contain cyanoacrylate, then it’s not super glue.

Tips For Working With Super Glue

When working with cyanoacrylate glue, there are certain things you’ll want to keep in mind.

  • First, if you’ve ever used superglue before, you can attest to how easily it bonds to anything, including the human skin. As a result, you may end up inadvertently gluing your fingers together instead of your broken item. An easy way to prevent this from happening is to wear gloves before working with super glues. In fact, it’s a good practice to wear gloves when dealing with any type of glue to avoid problems.
  • Another important thing to do before you begin applying super glue is surface preparation. Contaminants like dirt or oil on the surface you’re working with can adversely affect the bonding strength and drying time of the super glue product. Thus, you should endeavor to get the surface clean and dry before applying glue. This will allow the glue to bond easily with the material.
  • If you are working on a complex bonding surface, you might want to mask or cover the surrounding surfaces before applying the glue. This will help to prevent any issues that might otherwise arise during application. 
  • Super glues have a short shelf life of about a year from the manufacture date if unopened and just a month on they’ve been opened. This is due to its reaction with moisture. Thus, to store super glue in a way that maximizes its shelf life, the container has to be as airtight as possible. Clean up any excess adhesive at the opening of the tube and try to squeeze out any excess air. Make sure to close the lid tightly as well. You can also store superglue in the freezer as the polymerization reaction does not occur below the freezing point of water.
  • Cured super glue can be removed from a surface through mechanical means, which involves scraping it away with a tool, or by using chemical solvents to dissolve it. If you get superglue on your skin, you can remove it with the aid of acetone

Is Super Glue Food-Safe?

Super glue is generally not food-safe.

Cyanoacrylate, which is the main ingredient in superglues, is a toxic chemical that should not come in contact with food. As a result, super glue products are not FDA-approved for either direct or indirect food contact, and thus, are not considered to be food-safe.

So if you’re looking to quickly repair a kitchen utensil that will come in contact with food, super glue is not the best option, despite its strengths.

To keep yourself and others safe, you’ll need to get a food safe adhesive that doesn’t contain cyanoacrylate. Fortunately, there are numerous non-toxic glue products that you can use instead of super glue.

What Are Some Food-Safe Glue Alternatives to Super Glue?

The most common type of food-safe glue is an epoxy glue. This type of glue forms bonds that are as strong as cyanoacrylate glues without being toxic.

Epoxy glues are generally made from materials that are considered to be food-safe by the FDA. Epoxy glues are also produced by most of the popular brands that manufacture super glues such as Gorilla and Elmer’s, among others. 

Two-part epoxy glues consist of a resin and a hardener which must be mixed together before application. These glues are able to resist moisture, solvents, oil, and can be used in a wide variety of environments. They also have good shear strength and high tensile strength. 

1. Gorilla 2-Part Epoxy

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If you’re looking for a food-safe super glue alternative to use for your kitchen repairs, check out the Gorilla 2-Part Epoxy glue product.

It’s an affordable, high-quality two-part epoxy glue that works great for repairs. The glue creates a durable bond between a variety of surfaces and also works well for gap-filling.

The Gorilla 2 Part Epoxy, 5 Minute Set glue dries clear, sets in just 5 minutes, and features an easy-to-use syringe which keeps the epoxy resin and the hardener separate.

It can withstand moderate exposure to water. The product comes in at a really great price and has a ton of positive reviews from satisfied users.

2. Instant Krazy Glue Advanced Gel

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Another excellent food safe epoxy glue is the Krazy Glue Advanced Gel product. This glue works on wood, metal, rubber, glass, leather, plastic, and ceramic.

It features an advanced gel formula that creates a long-lasting, shock-resistant bond. The glue is completely non-toxic and is made from FDA-approved food-safe ingredients. It’s easy to use, effective, and versatile alternative to super glue.

3. Rhino Glue Pro Kit

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The Rhino Glue Pro-Kit is another superb food-safe option. This glue bonds virtually everything and does so very quickly. The product is available in a number of sizes and styles. Plus, it dries clear.

The Rhino Glue Pro Kit contains one Rhino Glue 40 gram product, one Rhino Glue Gel 15 gram product, and one Rhino Glue 10 gram Brush On Glue product in the package. Thus, you get a total of 65 grams of Rhino Glue for a very affordable price.

As you can see, there are a number of great food safe glue alternatives to cyanoacrylate glue that work just as well.

While some of these options may not set or cure as fast as super glue, they get the job done while being safe for use with kitchen utensils. So be sure to check these out when you need to fix a chopping board or other food-related items.

Up Next: How To Remove Fabric Glue From Clothes

building – What glue should I use for permanent LEGO construction?

So I’ve been referring to this post for a long time and I figured it is time to put in my experiences. One thing that many answers don’t talk about is that different glues are good for different purposes so my input will revolve around that.

A little background. I’ve been building Lego for multiple decades though only recently started using glue as I’ve started making art and design for other people through my side business and almost unanimously they want something permanent. I make small delicate designs (I am being intentionally vague here since I don’t want to look like I am advertising), mosaics, and large company logos.

The mosaics are made by taking the large grey baseplate and putting a single layer of plates on it (studs out). For this application I use 100% pure acetone. I take a small brush, dip it in the acetone and brush it on a small section of the baseplate and put the mosaic plates on before it dries. Stays together great and if you don’t use too much it won’t bleed out and mar the look of the mosaic.

For the logos and the small designs, which are built studs up (showing a smooth surface – like building a brick wall), acetone is terrible. Since it melts ABS plastic and is not viscous, it runs along the edges of the bricks creating smudges that don’t come out. The end result looks bad especially in those areas where there is a connection between 2 contrasting color bricks. I also tried hobby glue (Testor’s Cement Glue) and the results were not great but for different reasons. This glue is very viscous but what happens is when you apply it, it trails thin strands of glue that you need to clean up before it dries. When you squeeze the bricks together (a very tight fit), the glue squirts out and if you wipe it away it mars the glossy surface of the brick. That and that stuff smells so bad it makes you sick. What I have settled on is what Jay mentioned above: Zap-A-Gap. It is viscous enough to not run, does not thin out to strands, doesn’t smell nearly as bad as the other glues, and dries really, really strong. I put on a small amount on the back of the brick so that the front surface looks untouched. I just finished a 30″ square logo with a Lego frame and I can pick up the piece from its frame without any give. Still looking for a better solution, but Zap-A-Gap is the best for this.

Sorry for the long post, hope this helps!

How To Glue Polycarbonate – Cut Plastic Sheeting

Despite being almost 30 times more sturdy than glass and extremely resilient to damage, you cannot simply adhere two pieces of Polycarbonate together using regular solvents, as this will cause the material to craze. Crazing occurs when the bonds that hold the material together at a microscopic level are damaged or broken, causing the material to appear as though it has hundreds of tiny little cracks both on and underneath its surface; these cracks cannot be felt however, and it is important to note that the material will still be capable of bearing a load.

There are two methods of bonding pieces of polycarbonate effectively, one being the use of an epoxide glue (Epoxy), which is relatively straight forward and not at all dissimilar to gluing any other two materials together; and the other being fusing the two together. Fusing is superior to using Epoxy as the end results tend to look seamless, almost invisible, and the bond itself is actually stronger and more resilient.

To fuse the material all you need are your polycarbonate sheets and some Methylene Chloride, which can easily be bought online; once you have these two things you can get started with bonding your sheets together.

Bonding Polycarbonate

Your best first step would be to thoroughly clean the areas that will be adhered. This is best done by rinsing the sheets with lukewarm water before washing it in soapy water of the same temperature; use a gentle cloth or sponge and wipe it, preferably in the direction of the grain. It is important that you do not scrub or use anything with a rough surface, as the sheet will blemish. Rinse it one last time and then dry it off with another cloth.

Once dried you can start the process of fusing the sheets together by applying a small trail of your methylene chloride along the edge of the sheet that you intend to fuse; be sure to carry this out in a well ventilated area, as methylene chloride is toxic and the fumes can be harmful. It should only take a moment but give the adhesive some time to soak into the sheet and become slightly sticky before placing the edge directly onto the surface of the other sheet where you would like it bond.

Hold the sheets carefully in place, ensuring that the two surfaces that are being fused remain in constant contact. To this end it is also a good idea to apply a small amount of pressure on the sheets, encouraging a stronger bond to form. Once they are capable of supporting themselves, leave them to dry for a minimum of a full 48 hour; we recommend that you put as little strain on either of the pieces as possible; as doing so before the bond has fully formed may result in a weaker bond, or cause the two sheets to come apart.

This exact same process can also be used to glue sheets of Plexiglass or Perspex to one another, but it will not work on other plastics. Acrylic can also be bonded using a different method, one that involves specifically designed acrylic glue; if you would like to find out how to glue acrylic edges then please follow the link ‘here‘.

Rock painting hide and seek: The game parents are playing with kids in lockdown

Have you noticed lots of pretty rocks in your feed lately? Here’s why, and how you and your kids can also be a part of the rock painting hide and seek game.

Parents have had to become pretty inventive over the last 18 months in order to keep our kids entertained, active and mentally stimulated. One trend that has been increasing in popularity in recent months is one that you can do anytime, anywhere, and all you need are some paints and a little imagination.

Want to join the family? Sign up to our Kidspot newsletter for more stories like this. 

David paints rocks and hides them in his local area. Source: David Stanley.

RELATED: Entertaining the kids during isolation

Hide and seek, ROCKS edition

You may have seen these little critters popping up on your social media. There are groups of people in various areas who paint rocks and hide them in a sort of online scavenger hunt.

On the back of the rocks, you’ll find the tag of the Facebook page they’re connected with so people can find them and provide an update on where they were found and where they may be headed next.

It’s a great way to get the kids crafting at home, but also out and about scouting for the perfect rock and searching for other people’s creations which they can then relocate to a different area. And in the days of social distancing, it’s become a great hobby for many Australian families.

Peta, a mum of two from the new South Wales South Coast has been painting and hiding rocks for some time now with her two daughters aged six and eight. She discovered the game her daughters found some painted rocks and she subsequently read all about it on social media.

“It has given us something to do at night while we relax after dinner,” Peta told Kidspot.

“The kids enjoy coming up with ideas and it is mindfulness for us all. They also enjoy connecting to the community and seeing their rocks being rehidden on our walks.”

RELATED: Cherry picking is the perfect activity for kids

Some of Peta and her girls’ creations. Source: supplied.

RELATED: 21 things to do with a Sharpie

How it works

We’ve put together step-by-step instructions on how you can take part in this activity with your kids (or not, if you’d rather enjoy some ‘me time’).

First, find yourself some unpolished, clean, dry rocks. Bunnings sell river rocks that work well, or you can venture out and find your own!

Paint your rocks – use of a primer first makes for better results, and acrylic paint is the best to decorate with, but you can also use paint pens.

Write the name of your Facebook group on the back so people know where they can update the travels of your rocks.

Here are just some of the groups we’ve found (if you search your local area with the word “rocks” you might find a group local to your area):

Have fun!!!

90,000 ADHESIVES BASED ON SILICONE-ACRYLIC HYBRID POLYMER

TECHNICAL FIELD

The invention relates to silicone-acrylic hybrid polymers, pressure sensitive adhesive compositions containing hybrid polymers and their end uses. In particular, the invention relates to adhesives that are ideally suited for use in contact with the skin and can be used in the manufacture of medical tapes and transdermal drug delivery systems.BACKGROUND

BACKGROUND OF THE INVENTION

Pressure-sensitive adhesive (SP) compositions are used in the manufacture of pressure-sensitive adhesive plasters. Such tapes generally include a backing substrate and an SPC adhesive composition.

One area in which KCH adhesive compositions find widespread use is in the medical segment, for example, various tapes, bandages and drug delivery devices. In a variety of such applications, such as, for example, transdermal patches, there is direct contact between the KCH adhesive composition and the patient’s skin.The adhesives for skin application exhibit stable tackiness at room temperature, hold the article to be adhered to the skin with light pressure, and should be easily removed without causing pain or build-up from adhesive residues.

In medical applications, the requirements imposed on the formulation of the SCN adhesive are particularly stringent in order to avoid skin irritation and allergic reactions. In addition, such adhesives should adhere well to human skin during sweating in hot weather or in the environment of oozing wounds.

Continuous, controlled drug delivery across the dermis, that is, the skin, provides many advantages over other routes of drug administration. Transdermal drug delivery provides a comfortable, convenient and non-invasive alternative to other drug delivery methods, such as by oral ingestion of a medicinal product at fixed intervals or by subcutaneous injection.Transdermal drug delivery systems not only provide controlled release of the pharmaceutical product in a sustained release mode, but also reduce side effects such as gastrointestinal irritation, prevent first pass inactivation, unsatisfactory or erratic absorption from the gastrointestinal tract, and inactivation by fluids of the gastrointestinal tract. Transdermal drug delivery also enables a high degree of control over the concentration of any particular drug in the blood.These benefits improve patient compliance and treatment regimens and enhance the safety and efficacy of medicines.

In transdermal drug delivery systems, drugs are delivered from a patch applied to the skin using a pressure sensitive adhesive. The known advantages of continuous transdermal drug delivery devices have stimulated the development of transdermal drug delivery systems for the administration of a wide variety of drugs.

Acrylate-based SPC adhesives have been widely used in transdermal drug delivery systems because they have a relatively low cost compared to other SPC adhesives, solubilize many types of functional drugs, adhere well to a wide variety of different surfaces, and can be formulated if necessary. their formulations, providing the formation of adhesion to the surface. The disadvantages of acrylate-based PSC adhesives include poor high temperature performance, poor low temperature performance, inability to adhere to surfaces with low surface energies, and the potential to form excess skin adhesion in medical tape applications, which can result in painful removal for user.

Silicone based adhesives exhibit good both high and low temperature performance, excellent chemical inertness, electrical insulating properties, biocompatibility and adhesion to substrates with low surface energy. The main disadvantage of silicone-based KSN adhesives is their high cost in comparison with other technologies. Other limitations compared to acrylate-based PSC adhesives include reduced tack and limited adhesion formation as needed.

While both silicone adhesives and acrylic adhesives for skin applications are known and used in the art, there is a continuing need and unmet need for improved SPC adhesives that can be used in medical applications, in particular delivery applications. medicines. In transdermal drug delivery applications, the pharmaceutically active ingredient generally exhibits very low solubility in the silicone adhesive SPC matrix, while the solubility in the acrylic adhesive SPC matrix is ​​generally greater.In order to optimize the delivery system for a particular application, it is sometimes desirable to achieve an intermediate level of solubility. One simple approach used by Noven Pharmaceuticals, Inc. in United States Patent Nos. 5474783, 5656286, 6024976, 6221383, 6235306, 6465004 and 6638528 is to prepare a simple mixture of silicone and acrylic nibs on the KCH. Despite the possibility of achieving optimization of drug solubility in this approach, such a mixture of incompatible polymers is thermodynamically unstable.This can lead to macroscopic phase separation and changes in adhesive properties over time. One attempt to overcome this problem by creating an acrylic-grafted silicone POC was made by Dow Corning Corp. in accordance with the description in international publication No. WO 2007/145996, which uses a three-stage method, where the silicone adhesive KCH is first obtained as a result of thickening of rubber and resin, after which blocking end groups of a reagent reactive to a free the radical mechanism, and finally add an acrylic monomer, and then carry out free-radical polymerization in the presence of KCH glue with introduced blocking end groups.This sophisticated process makes the removal of residual monomer more problematic. High levels of acrylic monomer are unacceptable in skin contact applications. In addition, although free radical grafting of silicone and acrylic polymers is possible, it is relatively uncontrollable. One additional disadvantage of this approach is the need for an external crosslinker and / or high levels of acidic comonomer to achieve high cohesive strength.A high level of cohesion may be necessary to eliminate the plasticizing effects associated with certain active ingredients or other drugs such as skin permeation enhancers, which leads to cold flow of the adhesive around the perimeter of the patch and retains adhesive residues on the skin after the patch is removed. External crosslinkers such as dibenzoyl peroxide, metal acetylacetonates or orthoalkyl titanates can result in unwanted by-products resulting from degradation or drug interaction.High acid levels are also undesirable due to the potential for drug interactions.

A physical mixture of silicone and acrylate is known, however, such a physical mixture is thermodynamically unstable and would lead to macroscopic phase separation and changes in adhesive properties over time. In addition, unreacted silicone and acrylic components are immiscible, this can also lead to phase separation over time, even if the remaining components are covalently grafted together.

The present invention describes a method for preparing new covalently grafted mixtures of silicone and acrylic materials using a prepolymerized acrylic polymer, but having reactive groups, and combining it with a precursor of silicone adhesive KCH. These reactive groups on the acrylic material are preferably grafted onto the KCH silicone adhesive during its final reaction phase known as the “thickening” step, whereby the reactive groups on the silicone rubber and resin condense to form covalent bonds.The acrylic reactive groups are such that they are able to take part in this thickening process while self-crosslinking. Thus, the acrylic material is grafted onto the final KCH silicone adhesive in a single step in a more controlled reaction; no acrylic monomer needs to be removed, and high levels of shear stress can be obtained in the absence of external crosslinkers or high levels of acidic comonomer.

The present invention relates to the need of the state of the art for PSC adhesives that demonstrate the advantages of both acrylate and silicone based adhesives technologies without the disadvantages of the prior art.

SUMMARY OF THE INVENTION

The invention provides polymers and peel compositions that can be formulated directly or formulated for use in medical applications including use in transdermal drug delivery systems.

One aspect of the invention relates to hybrid silicone polymers. The hybrid polymers of the invention are prepared by reacting a silicone resin component, a silicone resin component, and an acrylic resin component.In one embodiment, a hybrid polymer is prepared by chemically reacting a silicone polymer component, a silicone resin component, and an acrylic polymer component to form a hybrid silicone-acrylate polymer, where the acrylic polymer component covalently self-crosslinks and covalently bonds to the silicone polymer and / or silicone resin. components. In a second embodiment of the invention, a hybrid polymer is prepared by chemically reacting a silicone polymer component, a silicone resin component and an acrylic polymer component to form a hybrid silicone-acrylate polymer, where the silicone resin component comprises a silicone resin containing triorganosiloxy units R 3 SiO 1/2 , where R is an organic group, and tetrafunctional siloxyl units SiO 4/2 with a molar ratio in the range from 0.1 to 0.9 units R 3 SiO 1/2 on each link SiO 4/2 .In one preferred embodiment, the acrylic polymer comprises greater than about 90 weight percent of the alkyl (meth) acrylate component, and more than about 0.2 weight percent of alkoxysilyl functional monomers, halogenosilane-containing monomers, and / or polysiloxane-containing monomers. In a second embodiment, the acrylic polymer comprises end-capped alkoxysilyl functional groups and / or a polysiloxane-capped macromer.

Another aspect of the invention relates to a method for producing a hybrid polymer by means of a stepwise condensation reaction.The silicone resin component is first reacted with the silicone resin component to result in a silicone POC adhesive, and this resulting silicone POC adhesive is then reacted with an acrylic polymer containing reactive functionality to form a silicone-acrylic hybrid polymer.

In yet another aspect, the silicone resin component is first reacted with an acrylic polymer containing reactive functionality to form an intermediate, and then the silicone resin component is reacted with the intermediate to form a hybrid silicone-acrylic polymer.

In one further aspect, the silicone polymer component is first reacted with an acrylic polymer containing reactive functionality to form an intermediate, and then the silicone resin component is reacted with the intermediate to form a hybrid silicone-acrylic polymer.

In the above reactions, the components are reacted in an organic solvent in the presence of an acidic, basic or organometallic catalyst such as an organic salt of tin, titanium, aluminum, bismuth, organometallic reagents such as organolithium reagents and Grignard reagents, or mixtures thereof.

Another aspect of the invention relates to pressure sensitive adhesives and adhesive articles comprising pressure sensitive adhesive made using the hybrid polymers of the invention. Adhesives can advantageously be used to prepare adhesive articles, including pressure sensitive adhesive, for use in medical applications or industrial applications. The glue can be used in the manufacture of articles such as plasters, bandages and tapes, which, due to the action of the glue, adhere to the skin.Articles of the invention will typically include a substrate substrate having an adhesive coating on at least one surface thereof. In one embodiment, the article includes a pressure sensitive adhesive and a therapeutic agent. In one preferred embodiment, the adhesive is used as a carrier for the physiologically active agent. The adhesive will typically contain hybrid polymers containing more than 20% silicone polymer component, more than 20% silicone resin component, and less than 60% acrylic polymer component.

Yet another aspect of the invention relates to a method of administering a therapeutic agent to a patient, comprising applying to a patient’s body surface an article comprising a support substrate having a pressure sensitive adhesive coating on at least one surface thereof and a physiologically active agent. In one embodiment, the article includes an adhesive layer into which the drug to be delivered is incorporated, an outer support layer, and an inner release layer.

BRIEF DESCRIPTION OF FIGURES

Fig. 1 is a DMA plot comparing the mechanical behavior of a prior art silicone-acrylic blend (-◊-) and a silicone-acrylate hybrid of the invention (- □ -) and (-Δ-).

Fig. 2 is a DMA graph showing the mechanical behavior of a silicone-acrylic hybrid polymer that has been reacted in a stepwise fashion.

DETAILED DESCRIPTION OF THE INVENTION

Mass percent denotes percent on a dry basis unless otherwise stated explicitly.

The invention provides hybrid polymers obtained by reacting a mixture of a silicone polymer component, a silicone resin component and an acrylic polymer component. The invention also provides pressure sensitive adhesives comprising hybrid polymers. The adhesives of the invention have properties that make them suitable for use in industrial applications as well as for drug delivery and cosmetics and for delicate skin contact.

The components used to prepare the hybrid polymer are reacted in an organic solvent in the presence of a catalyst such as a base, acid and / or organometallic catalyst such as an organic salt of tin, titanium, aluminum, bismuth, organolithium, Grignard reagent, or a mixture thereof …

Suitable silicone polymer components that can be used in the practice of the invention include silicone polymers that include an organo-substituted polysiloxane.Diorgano substituents include, for example, dimethyl, methylvinyl, methylphenyl, diphenyl, methylethyl, and (3,3,3-trifluoropropyl) methyl. In one embodiment, the diorgano substituents are dimethyl. Terminal blocking functionalities such as hydroxyl, alkoxyl, hydride, vinyl functional groups, and the like will generally be incorporated into the silicone polymer. In one embodiment, the terminal blocking functional groups are hydroxyl groups. The molecular weight of the polydiorganosiloxane will typically range from about 50,000 to about 1,000,000, preferably from about 80,000 to about 300,000.Unless otherwise indicated, molecular weight herein refers to the weight average molecular weight Mw.

Suitable silicone resin components that can be used in the practice of the invention include MQ silicone resins which contain 0.05 to 5 weight percent silicon-bonded hydroxyl groups and contain triorganosiloxyl units R 3 SiO 1/2 and tetrafunctional siloxyl units SiO 4/2 with a molar ratio of 0.1-0.9, preferably 0.6-0.9, units R 3 SiO 1/2 for each unit SiO 4/2 …They can be used as a solid or in solution in an organic solvent such as toluene or xylene. Preferred organic groups R of the silicone resin are vinyl, methyl, phenyl and the like, and mixtures thereof. One preferred R group is a methyl group. To reduce the amount of OH in the resin, the resins can also be subjected to additional processing when using, for example, Me 3 SiOSiMe 3 , ViMe 2 SiOSiMe 2 Vi, MeViPhSiOSiPhViMe, Me 3 SiNHSiMe 3 or triorgan such as Me 3 SiCl, Me 2 ViSiCl or MeViPhSiCl, (where Me = methyl; Vi = vinyl and Ph = phenyl).

Suitable acrylic polymer components that can be used in the practice of the invention include acrylic polymers that include at least an alkoxysilyl functional monomer, a polysiloxane-containing monomer, a halogenosilyl functional monomer, or an alkyloxyhalogenosilyl functional monomer. Alkoxysilyl-functional monomers, being incorporated into the backbone of the acrylic polymer, undergo condensation reactions with the OH-functional groups of the silicone resin or silicone polymer in the presence of a catalyst.The alkoxysilyl functional groups of the acrylic polymer can also undergo a self-crosslinking reaction in the presence of water / moisture and a catalyst during the condensation reaction. This crosslinking reaction results in stable crosslinked acrylic polymer domains that contribute to the cohesive strength of the final adhesive film. Such acrylic polymer domains also serve as many small reservoirs for dissolving and storing drug molecules. Under the action of acid or base catalysis, the polysiloxane chains undergo chain cleavage and recombination with other components in the hybrid system.Polymers containing more than about 0.2 wt% alkoxysilyl functional monomers have been found to be particularly well suited for use in hybrid adhesive compositions of the invention and can be used in the manufacture of adhesive articles such as, for example, adhesive plasters and adhesive sheets. by applying an adhesive or adhesive composition to a base material such as paper, cloth or plastic film.

Examples of alkoxysilyl functional monomers include trialkoxysilyl and dialkoxysilyl functional acrylates or methacrylates.Preferred alkoxysilyl functional monomers are trimethoxylsilyl and dimethoxymethylsilyl functional acrylates or methacrylates.

Examples of polysiloxane-containing monomers include polydimethylsiloxane monoacrylates or β-monomethacrylates.

Other suitable silyl functional monomers include triethoxylsilyl and diethoxymethylsilyl functional acrylates or methacrylates.

The silyl-functional monomers will generally be used in amounts ranging from 0.2 to 20 weight percent of the acrylic polymer, more preferably the amount of silyl-functional monomers will range from about 1.5 to about 5 weight percent of the acrylic polymer.

The amount of polysiloxane-containing monomer will generally be used in the range of 1.5 to 50 weight percent of the acrylic polymer, more preferably the amount of polysiloxane-containing monomers will be in the range of 5 to 15 weight percent of the acrylic polymer.

Yet another acrylic polymer component that can be advantageously used in the practice of the invention are acrylic polymers containing end-capped alkoxysilyl functional groups or copolymers containing polysiloxane blocks or grafted with polysiloxane.Examples of end-capped alkoxysilyl functional groups are trialkoxylsilyl, dialkoxysilyl functional groups. Preferred end-capped alkoxysilyl functional groups are trimethoxylsilyl, dimethoxymethylsilyl, triethoxylsilyl and / or diethoxymethylsilyl functional groups. Examples of such polymers are SA polymers available from Kaneka. Block copolymers are also suitable.One example of a polysiloxane block copolymer is a polydimethylsiloxane-acrylic block copolymer. The preferred amount of siloxane block is in the range of 10 to 50 weight percent of the total block copolymer.

Acrylic polymer components include alkyl (meth) acrylate monomers. Preferred alkyl (meth) acrylates that can be used in the practice of the invention contain up to about 18 carbon atoms in the alkyl group, preferably from 1 to about 12 carbon atoms in the alkyl group.These acrylic polymer components may include a low glass transition temperature (Tg) alkyl acrylate monomer. Monomers having a low Tg are those with a homopolymer Tg of less than about 0 ° C. Low Tg alkyl acrylates preferred for use in the invention contain from about 4 to about 10 carbon atoms in the alkyl group and include butyl acrylate, amyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, isooctyl acrylate, decyl acrylate, isomers thereof, and combinations thereof.Particularly preferred are butyl acrylate, 2-ethylhexyl acrylate and isooctyl acrylate. Low Tg acrylic monomers are preferably, but not necessarily, present in amounts greater than about 40 wt% based on the total weight of the acrylic polymer monomers. The acrylic polymer components may further comprise high glass transition (meth) acrylate monomers. Non-limiting examples include methyl acrylate, ethyl acrylate, methyl methacrylate, and isobutyl methacrylate.The practitioner in the relevant art should understand that the choice of monomers is determined by consideration of adhesive properties, compatibility with other components of the adhesive matrix, drug solubility, and the like. Thus, the Tg of a monomer is only one of many variables taken into account when designing any particular polymer.

The acrylic resin component may further have a polyisobutylene group to improve the cold flow characteristics of the resulting adhesive.

Examples of acrylic polymers, which include halogenosilyl or alkoxyhalogenosilyl functional monomers, can be obtained by copolymerization of 3-methacryloxypropyl dimethylchlorosilane, 3-methacryloxypropyl dichlorosilane, 3-methacryloxypropyltrichlorosylloroxypropyl 3-acryloxypropyl-3-acryloxypropyl

Acrylic polymer components may include nitrogen-containing polar monomers. Examples include N-vinyl pyrrolidone, N-vinyl caprolactam, N- (tertiary octyl) acrylamide, dimethyl acrylamide, diacetone acrylamide, N- (tertiary butyl) acrylamide, N-isopropyl acrylamide, cyanoethyl acrylate, N-vinyl acetamide, and N-vinyl formamide.

The acrylic polymer component may include one or more hydroxyl-containing monomers such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, and / or hydroxypropyl methacrylate. Such hydroxy-functional monomers are generally used in amounts up to about 40 wt%, more often in the range from about 0.5 to about 10 wt%, based on the total weight of the acrylic polymer monomers.

The acrylic polymer components may optionally include carboxylic acid-containing monomers.Suitable carboxylic acids preferably contain from about 3 to about 6 carbon atoms and include, but are not limited to, acrylic acid, methacrylic acid, itaconic acid, β-carboxyethyl acrylate, and the like. Acrylic acid is particularly preferred. Such carboxy-functional monomers are generally used in amounts up to about 25 wt%, more often in the range from about 0.5 to about 10 wt.%, based on the total weight of the acrylic polymer monomers.

Other suitable well-known comonomers include vinyl acetate, styrene, cyclohexyl acrylate, alkyldi (meth) acrylates, glycidyl methacrylate and allyl glycidyl ether, as well as monomers such as poly (styryl) methacrylate.

One acrylic polymer component that can be used in the practice of the invention is an acrylic polymer that includes from about 90 to about 99.5 wt.% butyl acrylate and from about 0.5 to about 10 wt.% dimethoxymethylsilyl methacrylate.

Notwithstanding one particular polymerization method described in the examples, the acrylic resin component of the present invention can be prepared by conventional polymerization methods known to those skilled in the art. These methods include, but are not limited to, solution polymerization, suspension polymerization, bulk polymerization, and emulsion polymerization. It may also be advantageous in the practice of the invention to reduce the level of sufficient monomer or to remove or reduce levels of solvent and / or other volatiles after polymerization using methods that are known and common in the art.The adhesive can be applied from an organic solution, an aqueous dispersion, or from a hot melt.

Hybrid pressure-sensitive adhesive compositions can be prepared using any suitable method depending on the reactive groups present in the silicone polymer, silicone resin and acrylic polymers. The hybrid polymer can conveniently be obtained using a one-step process. In one preferred method, the adhesives are prepared by conducting a condensation reaction on a mixture of a silicone polymer component, a silicone resin component, and an acrylic component.The reaction can proceed in the absence of a catalyst, or alternatively and more preferably in the presence of a catalyst.

Examples of catalyst include organometallic metal salts such as tin, titanium, aluminum, bismuth, organometallic reagents such as organolithium and Grignard reagents, organic and inorganic acid such as methanesulfonic acid, sulfuric acid, acid clay, acidic ion exchange resins Amberlyst ™ (Rohm and Haas), organic and inorganic bases such as KOH, NaOH, (NH 4 ) 2 CO 3 , ammonium carbamate and organic bases such as triethylamine, triethanolamine.In the case of reactive groups such as halosilanes in acrylic polymer, the condensation reaction with silicone polymer and / or silicone resin can be carried out without using a catalyst. Although it is possible to carry out the condensation reaction at room temperature, one preferred method is to carry out the condensation reaction while heating at 50-160 ° C. As the reaction solvent, organic solvents such as toluene, heptane or xylene can be used.As the reaction solvent or co-solvent, other organic solvents such as aliphatic hydrocarbons, tetrahydrofuran, ethyl acetate, methyl ethyl ketone and the like can also be used. The condensation is preferably allowed to proceed at least to the point of substantially canceling the rate of removal of the evolution of condensation by-products such as water and alcohol. Heating is continued until the desired physical properties such as viscosity, tack and adhesion values ​​are obtained.Typically, the mixtures will be allowed to react for a period of time ranging from about 1 to about 24 hours.

From an essential drug compatibility standpoint, it is often desirable to block the remaining silicon-bound hydroxyl groups after condensation reactions for the silicone polymer, MQ resin and acrylic polymer components. This is usually achieved by additional heating of the solution in the presence of, for example, hexamethyldisilazane.Other suitable subsequent chemical treatments are disclosed in United States Patent No. 4,655,767 to Dow Corning Corp .; it is incorporated by reference into this document. The introduction of blocking end groups is a step that prevents the drugs or actives from catalyzing further condensation of the free hydroxyl groups, resulting in a loss of tack. The introduction of blocking end groups is also essential to ensure the stability of the viscosity of the formulation in the presence of free hydroxyl groups.In order to achieve viscosity stability of the KCH adhesive formulation, it may be necessary to accept certain residual bases such as KOH, NaOH or organic amines, which prevents further condensation of free hydroxyl groups. This can be achieved by neutralization with carboxylic acids such as acetic acid or long chain fatty acids such as oleic acid, stearic acid, or polymeric acids such as Amberlyst acidic material, and the like.If long chain fatty acids were used, the resulting salt would remain in the mixture as a surfactant and could also function as a drug penetration enhancer.

When the condensation reaction is completed, the solids content of the resulting hybrid pressure sensitive adhesive composition can be adjusted by adding or removing a solvent. The solvent present can be completely removed and another organic solvent can be added to the hybrid pressure sensitive adhesive product.It is preferred that the hybrid pressure sensitive adhesive compositions be in solution in an organic solvent, where the organic solvent is from about 30 to about 90 weight percent of the total mixture of components.

While the object of the invention is to improve cohesion by providing self-crosslinking without the need for an external additive, it will be apparent to the practitioner in the art that the pressure sensitive adhesives of this invention can be further crosslinked by the action of peroxide. by vinyl groups on polymer components.Likewise, additional crosslinking of the acrylic phase after polymerization, if desired, can be achieved by the addition of known crosslinkers such as organometallic compounds.

As used herein, the term “pressure sensitive adhesive” refers to a viscoelastic material that adheres instantly to most substrates upon application of light pressure and remains firmly tacky. The polymer composition may be a pressure sensitive adhesive, as used herein, if it has the properties of a pressure sensitive adhesive as such, or has the functions of a pressure sensitive adhesive as a result of the admixture of tackifiers. , plasticizers or other additives.

Suitable tackifiers are those known in the art, including: (1) aliphatic hydrocarbons; (2) mixed aliphatic and aromatic hydrocarbons; (3) aromatic hydrocarbons; (4) substituted aromatic hydrocarbons; (5) hydrogenated esters; (6) polyterpenes; (7) esters of rosin; and (8) wood gums or rosins and their hydrogenated forms. Suitable levels of tackifiers generally range from about 1 wt.% to about 30 wt.% based on the weight of the total adhesive composition.

The adhesives of the present invention may also contain admixed polymers to further increase or decrease, as needed, the solubility of the drug in the polymer matrix of the adhesive. Examples of polymers suitable for admixture with the polymers of the adhesive of this invention include, but are not limited to, other acrylates, polysiloxanes, polyisobutylene, polypropylene oxide, polyisoprene, polybutadiene, styrene block polymers, and the like.Examples of styrenic block copolymers include, but are not limited to, the following: styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene copolymer (SBS), styrene-ethylene butene-styrene copolymers (SEBS), and diblock analogs thereof.

The compositions of the invention may include other additives known to those skilled in the art. These additives may include, but are not limited to, the following: pigments, fillers, fluorescent additives, flow improvers and leveling agents, wetting agents, surfactants, defoamers, rheological modifiers, penetration enhancers, stabilizers, and antioxidants.

Antioxidants are typically added singly or in combination to prevent ingredients from degradation during the preparation and use of adhesive compositions and to provide long term heat resistance. In general, up to about 1 weight percent of one or more antioxidants can be included in the adhesive composition, typically from about 0.1 weight percent to about 0.5 weight percent.

Although the pressure-sensitive adhesive of the invention can be used in any number of applications, for example in the case of labels, the adhesives are particularly well suited for use in medical applications.Pressure-sensitive adhesives are used in the manufacture of articles such as stoma anchors, adhesive plasters and bandages, wound drainage adhesive anchors, wound dressings, as adhesives for other products, and the like that adhere to human skin and remain sticky. even in a humid environment. The pressure sensitive adhesives of the invention may also be used in industrial tape and a variety of other PSC applications.

The adhesive of the invention is particularly well suited for use in transdermal drug delivery applications.The pressure sensitive adhesive of the invention can be incorporated into a transdermal drug delivery device designed to deliver a therapeutically effective amount of a product to a patient’s skin, for example, to treat skin irritation or to deliver a therapeutically effective amount of a drug through the patient’s skin. The term “transdermal” refers to the use of the skin as a portal for drug administration for topical administration or for diagnostic techniques such as blood chemistry monitoring.When applied topically, the drug passes into and / or through the skin. Thus, the term “transdermal” is used in this document in a broad sense in relation to the local administration of a drug that has a local effect, that is, on the surface or inside the skin, since in the case of, for example, a patch for combating skin imperfections used for the treatment of acne, and for topical application of a drug that has a systemic effect as a result of diffusion through the skin and entry into the bloodstream.

Transdermal drug delivery devices of the invention comprise a carrier (such as a liquid, gel, or solid matrix or pressure sensitive adhesive) which includes the drug to be delivered, an outer support layer and an inner release layer. If the patient peels the release film from the adhesive and applies a patch, the drug is redistributed into the stratum corneum (outer layer of the skin) and penetrates the epidermis and dermis.

The drug-containing polymer layer is preferably a pressure sensitive skin contact adhesive of the invention, which is a pharmaceutically acceptable material that does not have functional groups containing, for example, reactive hydrogen moieties or other groups capable of participate in reactions with the drug during the manufacture or storage of the patch or change the adhesive properties during storage as a result of the passage of unintended chemical reactions.The adhesive of the invention, when used as a carrier contact adhesive or a contact adhesive of a patch for transdermal patches, is non-irritating, easy to apply and easy to remove.

The term “drug” as used herein should be taken in its broadest sense to mean any substance that is intended to produce a particular beneficial therapeutic effect. A substance may or may not be pharmaceutically active, but will be “biologically active” in the sense that it has an effect on the human body.The substance can be used to treat or alter a condition that may or may not be pathological, that is, a stage of the disease. The terms “drug”, “biologically active agent”, “drug”, “medicine”, “therapeutic agent”, “physiological agent” and “pharmaceutical agent” are used interchangeably herein and include substances intended for use in diagnostics , curing, ameliorating, blocking, treating or preventing a condition or stage of a disease, or affecting the structure or function of the body.This term includes substances for the prevention of skin conditions that have a function of, for example, softening and moisturizing. The term “treatment” is used broadly to include prevention, change, cure, and control of a condition.

The drug in the drug delivery device of the invention is present in a therapeutically effective amount, that is, an amount effective to stimulate the desired therapeutic result in the treatment of the condition for which the drug of the present invention is to be used.An effective amount of a drug means a non-toxic, but sufficient amount of a drug to produce a selected effect over a specified period of time. The amount that constitutes a therapeutically effective amount will vary according to the particular drug included in the device, the condition being treated, any drugs co-administered with the selected drug, the desired duration of treatment, the skin surface area on which the device is to be placed, and other components of the drug delivery device.Such an amount can easily be determined by a practitioner in the relevant field of technology.

The drug delivery system of the invention, in addition to the drug, may advantageously also contain an effective amount of a penetration enhancer. An effective amount of penetration enhancer refers to an amount that achieves a selected increase in membrane permeability, rate of administration, and amount of drug delivered.Suitable enhancers are described, for example, in Percutaneous Penetration Enhancers, edited by E. H. Smith and H. I. Maibach, CRC Press, New York (1995).

The device of the invention is placed on the skin and allowed to remain there for a period of time sufficient to achieve or maintain the intended therapeutic effect. The time, which is sufficient time, can be selected by a person skilled in the relevant field of technology taking into account considerations of the flow rate for the device of the invention and the condition to be treated.

The transdermal delivery devices of the invention can be manufactured in the form of an article such as a tape, patch, sheet, bandage, or any other form known to those skilled in the art. The dosage system can be made in any desired unit dosage form. A round shape is common because it does not have corners that can easily detach from the skin, while a square or rectangular shape is used to minimize waste when cut from a roll or sheet.In addition to having different forms, the resulting unit dosage forms can be manufactured in various sizes.

Depending on the design of the patch and the condition being treated (eg, prevention of pregnancy, relief of pain, high blood pressure, smoking cessation, skin condition), the patch will remain on the skin for up to an hour or more, up to about one week. In one preferred embodiment, the patch is designed to remain on the skin at the site of application for about 24 hours when replaced daily.In yet another preferred embodiment, the patch is changed once or twice a week. Preferably, the patch will be placed on the skin at a different location from the previously used patches.

The term “patient” is used herein to include animals, both human and non-human, including domestic animals such as dogs, cats and horses, and livestock such as cattle and pigs. Agricultural and horticultural applications are also envisaged.

Treatment areas where the delivery device of the invention finds use and examples of pharmaceutical products that may be included in the devices of the invention include the treatment of incontinence (e.g., oxybutynin), central nervous system conditions (e.g., methylphenidate, rotigotine), hormone therapy, and prevention of pregnancy (eg estradiol, testosterone, progestin, progesterone, levonorgestrel), cardiovascular system (eg, nitroglycerin, clonidine) and cardiotonic drugs (eg digitalis, digoxin), pain relief, or anti-inflammatories (eg fentanyl, lidocaine, sufentanil, diclofenac, flurbiprofen), cosmetics (eg benzoyl peroxide, salicylic acid, vitamin C, vitamin E, aromatic oils), anti-nausea drugs (eg scopolamine, granisetron), smoking cessation (eg nicotine), anti-inflammatory conditions like steroids (for example, hydrocortisone, prednisolone, triamcinolone), so and non-steroidal agents (eg naproxen, piroxicam), antibacterial agents (eg, penicillins such as penicillin V, cephalosporins such as cephalexin, erythromycin, tetracycline, gentamicin, sulfathiazole, nitrofurantoin, and quinolones and quinolones, such as flaba norfechinocin) , antiprotozoal agents (eg metronidazole), antifungal agents (eg nystatin), calcium channel blockers (eg nifedipine, diltiazem), bronchodilators (eg theophylline, pirbuterol, salmeterol, isoproterenol), collagen inhibitors such as inhibitors protease inhibitors, elastase inhibitors, lipoxygenase inhibitors and angiotensin-converting enzyme inhibitors (eg captopril, lisinopril), other antihypertensive agents (eg propranolol), leukotriene antagonists, antiulcer agents such as H2 antagonists and / or antiviral agents (eg, antiviral agents , 1-isobutyl-1H-imidase o [4,5-c] quinolin-4-amine, 1- (2-hydroxy-2-methylpropyl) -1H-imidazo [4,5-c] quinolin-4-amine and acyclovir), local anesthetics ( for example benzocaine, propofol), antitussives (for example, codeine, dextromethorphan), antihistamines (for example, diphenhydramine, chlorpheniramine, terfenadine), narcotic analgesics (for example, morpholine, fentanyl, sufentanil), cardioactive drugs such as antiretroviral drugs (for example, carbamazine), immunosuppressants (for example, cyclosporine), psychotherapeutic agents (for example, diazepam), sedatives (for example, phenobarbital), anticoagulants (for example, heparin), pain relievers (for example, acetaminophen), anti-migraine drugs (for example , ergotamine, melatonin, sumatriptan), antiarrhythmics (eg flecainide), antiemetics (eg metaclopromide, ondansentron), antineoplastic agents (eg methotrexate), neurological agents such as anxiolytics, hemostatic agents, weight loss agents and the like, as well as their pharmaceutically acceptable salts, esters, solvates and clathrates.

When using the transdermal drug delivery device of the invention, it is conveniently also possible to use veterinary drugs, as well as agricultural and horticultural products. It should be understood that transdermal drug delivery in veterinary and horticultural applications allows for more accurate dosing and less waste than food / irrigation water.

The drug delivery device of the invention can be obtained using conventional methods of applying an appropriate carrier to a substrate.For example, a matrix device can be made by preparing a coating formulation by mixing a solvent-based adhesive solution with a drug and any drug media to produce a homogeneous solution or suspension; applying the formulation to a substrate (backing or release film) using well known roller, scraper, bar, or die coating methods; drying the coated substrate to remove the solvent; and laminating to the face of a release film or substrate.

The invention will be further described in the following examples, which are included for purposes of illustration and are in no way intended to limit the scope of the invention.

EXAMPLES

Silicone polymers (130,000-160000) and MQ methylsilicone resin (M / Q ratio (Me 3 SiO / SiO 4/2 ) was about 0.8) used in examples 2 to 6 was prepared according to prior art techniques (Silicon in Organic, Organometallic and Polymer Chemistry by M.Brook, US 2676182, US 2814601). The silicone polymer and MQ methyl resin used in Examples 10-12 were obtained from commercial sources.

Example 1

Initial batch containing 90.0 g butyl acrylate, 7.0 g methyl methacrylate, 3.0 g trimethoxysilylpropyl acrylate, 0.17 g 2,2′-azobisisobutyronitrile (AIBN) (polymerization initiator) and 100.0 g ethyl acetate (solvent), stirred and charged into a 1 L 4-necked round bottom flask equipped with a stainless steel stirrer, thermometer, condenser, water bath, and slow addition funnels.The initial batch was heated to reflux with stirring. After 15 minutes from the start of reflux, a monomer mixture containing 270 g of butyl acrylate, 21.0 g of methyl methacrylate, 9.0 g of trimethoxysilylpropyl acrylate was uniformly added over a period of 2 hours. In addition, after 15 minutes from the start of reflux, 51.15 g of ethyl acetate and 1.20 g of AIBN were added continuously and uniformly over a period of 4 hours.At the end of the addition, the contents of the flask were kept at reflux under reflux conditions for 1 hour. At the end of the holding period, the contents were cooled to room temperature and the polymer solution was discharged. The ethyl acetate solvent was removed by rotary evaporation in vacuo and fresh xylene was added to bring the solids content to 50%.

Example 2

Blend of silicone polymer polydimethylsiloxane (Mw 130,000, 48% in toluene, 90 g), acrylic polymer SA-100S from Kaneka (50% in toluene, 40 g) and base catalyst (NH 4 ) 2 CO 3 (1.0 g) was stirred at 60 ° C for 2 hours.Methyl silicone resin MQ (32.0% in toluene, 135 g) was added and the reaction mixture was stirred at 60 ° C for 12 hours. Thereafter, the reaction mixture was heated to 115 ° C for 2 hours while slowly blowing nitrogen gas. Hexamethyldisilazane (5.0 g) was added and the reaction was continued at 115 ° C for 2 hours. The product was cooled to room temperature and packed in a glass container for testing.

Example 3

Blend of silicone polymer polydimethylsiloxane (Mw 160,000, 48% in xylene, 100.0 g), an acrylic polymer prepared according to example 1 (Mw 230,000, 50% in xylene, 43.0 g), MQ methylsilicone resin (55.3% in xylene, 50 g) and acetic acid (0.5 g) were stirred at 50 ° C for 3 hours and at 135 ° C for 3 hours.The product was cooled to room temperature and packed in a glass container.

Example 4

Blend of silicone polymer polydimethylsiloxane (Mw 160,000, 48% in xylene, 100.0 g), an acrylic polymer prepared according to example 1 (Mw 230,000, 50% in xylene, 43.0 g), MQ methylsilicone resin (55.3% in xylene, 50 g) and base catalyst (NH 4 ) 2 CO 3 (1.0 g) were stirred at 60 ° C for 6 hours and at 115 ° C within 2 hours.Hexamethyldisilazane (5.0 g) was added and the reaction was continued at 115 ° C for 2 hours. The product was cooled to room temperature and packed in a glass container for testing.

Example 5

Blend of silicone polymer polydimethylsiloxane (Mw 160,000, 48% in xylene, 100.0 g), an acrylic polymer prepared according to example 1 (Mw 230,000, 50% in xylene, 43.0 g), MQ methylsilicone resin (55.3% in xylene, 50 g) and KOH powder (0.05 g) were stirred at room temperature for 6 hours and at 140 ° C. for 2 hours.Hexamethyldisilazane (5.0 g) was added and the reaction was continued at 140 ° C for 2 hours. The product was cooled to room temperature and packed in a glass container for testing. After cooling the reaction mixture to room temperature, Amberlyst acidic ion exchange resin (5 g) was added to neutralize KOH. The product was filtered to remove any particulate matter and packed in a glass container.

Example 6

Blend of silicone polymer polydimethylsiloxane (Mw 160,000, 48% in xylene, 100.0 g), an acrylic polymer prepared according to example 1 (Mw 230,000, 50% in xylene, 43.0 g), MQ methyl silicone resin (55.3% in xylene, 50 g) and Amberlyst ion exchange resin (1.0 g) were stirred at 80 ° C. for 6 hours.The product was filtered to remove any particulate matter and packed in a glass container.

Example 7 (Comparative Example)

An initial charge containing 100.0 g of butyl acrylate, 0.5 g of 2,2′-azobisisobutyronitrile (AIBN) and 100.0 g of ethyl acetate was prepared and loaded into a 1-liter 4-neck a round bottom flask equipped with a stainless steel stirrer, thermometer, condenser, water bath and dropping funnels for slow addition. The mixture was heated to reflux with stirring.After 30 minutes from the start of reflux, 30 g of ethyl acetate and 0.5 g of AIBN were added over a period of 2 hours. At the end of the addition, the contents of the flask were kept at reflux under reflux conditions for 1 hour. At the end of the holding period, the ethyl acetate solvent was removed by rotary evaporation in vacuo and fresh toluene was added to bring the solids content to 50%.

Example 8

An initial charge containing 98.0 g of butyl acrylate, 2.0 g of (3-acryloxypropyl) methyldimethoxysilane, 0.5 g of 2,2′-azobisisobutyronitrile (AIBN) and 100.0 g of ethyl acetate was prepared and charged into a 1 L 4-necked round bottom flask equipped with a stainless steel stirrer, thermometer, condenser, water bath, and addition funnels for slow addition.The mixture was heated to reflux with stirring. After 30 minutes from the start of reflux, 30 g of ethyl acetate and 0.5 g of AIBN were added over a period of 2 hours. At the end of the addition, the contents of the flask were kept boiling under reflux conditions for 1 hour. At the end of the holding period, the ethyl acetate solvent was removed by rotary evaporation in vacuo and fresh toluene was added to bring the solids content to 50%.

Example 9

Initial batch containing 90.0 g butyl acrylate, 7.0 g monomethacryloxypropyl terminated polydimethylsiloxane (MCR-M17, Gelest), 3.0 g (3-acryloxypropyl) methyldimethoxysilane, 0.4 g 2,2′-azobisisobutyronitrile (AIBN) and 100.0 g ethyl acetate were prepared and charged into a 1 L 4-necked round bottom flask equipped with a stainless steel stirrer, thermometer, condenser, water bath and dropping funnels for slow addition.The mixture was heated to reflux with stirring. After 30 minutes from the start of reflux, 30 g of ethyl acetate and 0.4 g of AIBN were added over a period of 2 hours. At the end of the addition, the contents of the flask were kept boiling under reflux conditions for 1 hour. At the end of the holding period, the ethyl acetate solvent was removed by rotary evaporation in vacuo and fresh toluene was added to bring the solids content to 50%.

Example 10 (comparative example)

Blend of silicone polymer polydimethylsiloxane (18.7 g), methyl silicone resin MQ (17.0 g), (NH 4 ) 2 CO 3 (0.5 g) and xylene (100 ml) was stirred at 60 ° C for 2 hours and then at 115 ° C for 2 hours. Hexamethyldisilazane (5.0 g) was added and the reaction was continued at 115 ° C for 2 hours. The acrylic polymer prepared according to Example 7 (50.0% in xylene, 18.0 g) was added and mixed well.The product was cooled to room temperature and packed in a glass container for testing.

Example 11

Blend of silicone polymer polydimethylsiloxane (18.7 g), methyl silicone resin MQ (17.0 g), (NH 4 ) 2 CO 3 (0.5 g), acrylic resin, obtained in accordance with example 8, (50.0% in xylene, 18.0 g) and xylene (100 ml) were stirred at 60 ° C for 2 hours, and then at 115 ° C for 2 hours. Hexamethyldisilazane (5.0 g) was added and the reaction was continued at 115 ° C for 2 hours.The product was cooled to room temperature and packed in a glass container for testing. The product was cooled to room temperature and packed in a glass container for testing.

Example 12

Blend of polydimethylsiloxane silicone polymer (18.7 g), MQ methyl silicone resin (17.0 g), KOH powder (0.03 g), acrylic polymer prepared according to Example 8, (50.0 % in xylene, 18.0 g) and xylene (100 ml) were stirred at 140 ° C for 2 hours.Hexamethyldisilazane (5.0 g) was added and the reaction was continued at 115 ° C for 2 hours. The product was cooled to room temperature and packed in a glass container for testing. The product was filtered off, cooled to room temperature and packed in a glass container for testing.

Example 13

Blend of polydimethylsiloxane silicone polymer (3.9 g), MQ methyl silicone resin (3.9 g), (NH 4 ) 2 CO 3 (0.2 g), acrylic resin, obtained in accordance with example 9, (1.95 g) and toluene (20 ml) was stirred at 60 ° C for 12 hours and at 115 ° C for 2 hours.Hexamethyldisilazane (0.7 g) was added and the reaction was continued at 115 ° C for 2 hours. The product was cooled to room temperature and packed in a glass container for testing. The product was filtered off, cooled to room temperature and packed in a glass container for testing.

Example 14

A mixture of monomers from butyl acrylate (BA) (BASF), 196.0 g, and 3-acryloxypropylmethyldimethoxysilane (3-APMDS) (Gelest Inc.), 4.0 g, was obtained in heptanes and transferred to an addition funnel …Received and transferred into a dropping funnel a solution of lauroyl peroxide initiator (Sigma-Aldrich), 1.0 g, in heptane, 80.0 g. 2 g was weighed into a 1 liter round bottom four necked flask equipped with a stainless steel banana blade stirrer, thermometer, condenser, oil bath and dropping funnels. The initial batch was heated to reflux with stirring.After 5 minutes at reflux, the monomer mixture and initiator solution were slowly and continuously added over 2 and 3 hours, respectively, while maintaining reflux. Upon completion of the addition, the contents of the flask were stirred for 2 hours while refluxing. As a result of stirring tert-amyl peroxypivalate (tert-APP, 75%) (Akzo Nobel), 2.0 g, in heptanes, 22.0 g, an acceptor solution was obtained, which was slowly added over 1 hour while refluxing under reflux conditions.After the addition, the mixture was stirred for 2 hours. After 2 hours of incubation, the contents of the flask were cooled to room temperature and the solid was analyzed.

Example 15

A mixture of monomers from butyl acrylate (BA) (BASF), 196.0 g, and methacryloxymethyltrimethoxysilane (Gelest Inc.), 4.0 g, was prepared in heptane and transferred to an addition funnel. Received and transferred to the dropping funnel a solution of the initiator lauroyl peroxide (Sigma-Aldrich), 1.0 g, in heptanes, 80.0 g.An initial charge consisting of 20% mixture of monomers, heptanes, 160.0 g, and lauroyl peroxide, 0.2 g, was weighed into a 1 liter round bottom four-necked flask equipped with a stainless steel stirrer with a paddle in the shape of a banana, thermometer, condenser, oil bath and drip funnels. The initial batch was heated to reflux with stirring. After 5 minutes at reflux, the monomer mixture and initiator solution were slowly and continuously added over 2 and 3 hours, respectively, while maintaining reflux.Upon completion of the addition, the contents of the flask were stirred for 2 hours while refluxing. Stirring tert-amyl peroxypivalate (tert-APP, 75%) (Gelest Inc.), 2.0 g, in heptanes, 22.0 g gave an acceptor solution which was slowly added over 1 hour while refluxing. After the addition, the mixture was stirred for 2 hours. After 2 hours of incubation, the contents of the flask were cooled to room temperature and the solid was analyzed.

Example 16

Silicone polymer polydimethylsiloxane, 18.0 g, (Mw 130,000), methylsilicone resin (MQ), 18.0 g, and heptane, 77.8 g, were weighed into a 250 ml round bottom four neck flask equipped with a stirrer. stainless steel device with banana blade, thermometer, condenser, oil bath and dropping funnel. The mixture was stirred at room temperature. The basic catalyst KOH, 1N, 0.12 g was added to the flask, and the mixture was heated to reflux with stirring for 5-6 hours.The next day, the acrylic polymer (Example 14), 9.0 g, was added to the mixture with stirring, and heated to reflux for 5-6 hours. Hexamethyldisilazane (Dow Corning), 3.05 g was added and stirred for an additional 2 hours. The solution was cooled to room temperature and analyzed for solids and viscosity.

Example 17

Silicone polymer polydimethylsiloxane, 18.0 g, (Mw 130,000), methylsilicone resin (MQ), 18.0 g, and heptane, 77.8 g, were weighed into a 250 ml round bottom four neck flask equipped with a stirrer. stainless steel device with banana blade, thermometer, condenser, oil bath and dropping funnel.The mixture was stirred at room temperature. The basic catalyst KOH, 1N, 0.12 g was added to the flask, and the mixture was heated to reflux with stirring for 5-6 hours. The next day, the acrylic polymer (Example 14), 9.0 g, was added to the mixture with stirring, and heated to reflux for 5-6 hours. To the mixture with stirring was added oleic acid (Sigma-Aldrich), 2.44 g, and heated to reflux for 2 hours.Hexamethyldisilazane (Dow Corning), 3.05 g was added and stirred for an additional 2 hours. The solution was cooled to room temperature and analyzed for solids and viscosity.

Example 18

Silicone polymer polydimethylsiloxane, 18.0 g, (Mw 130,000), methylsilicone resin (MQ), 18.0 g, heptane, 77.8 g, were weighed into a 250 ml round bottom four-necked flask equipped with a stirrer stainless steel with banana blade, thermometer, condenser, oil bath and dropping funnel.The mixture was stirred at room temperature. The basic catalyst KOH, 1N, 0.12 g was added to the flask, and the mixture was heated to reflux with stirring for 5-6 hours. The next day, the acrylic polymer (Example 15), 9.0 g, was added to the mixture with stirring, and heated to reflux for 5-6 hours. Hexamethyldisilazane (Dow Corning), 3.05 g was added and stirred for an additional 2 hours. The solution was cooled to room temperature and analyzed for solids and viscosity.

Example 19

Methylsilicone resin (MQ), 18.0 g, acrylic polymer (from Example 14), 9.0 g, and heptane, 77.8 g, were weighed into a 250 ml four-neck round bottom flask equipped with a stirrer. stainless steel with banana blade, thermometer, condenser, oil bath and dropping funnel. The mixture was stirred at room temperature. The basic catalyst KOH, 1N, 0.12 g was added to the flask, and the mixture was heated to reflux with stirring for 5-6 hours.The next day, silicone polymer polydimethylsiloxane, 18.0 g, (Mw 130,000) was added to the mixture with stirring, and heated to reflux for 5-6 hours. Hexamethyldisilazane (Dow Corning), 3.05 g was added and stirred for an additional 2 hours. The solution was cooled to room temperature and analyzed for solids and viscosity. The final product was a stable solution.

Example 20

Silicone polymer polydimethylsiloxane, 18.0 g, (Mw 130,000), acrylic polymer (from example 14), 9.0 g, and heptane, 77.8 g, were weighed into a 250 ml round bottom four-necked flask, equipped with a stainless steel stirrer with banana blade, thermometer, condenser, oil bath and addition funnel.The mixture was stirred at room temperature. The basic catalyst KOH, 1N, 0.12 g was added to the flask, and the mixture was heated to reflux with stirring for 5-6 hours. The next day, methyl silicone resin (MQ), 18.0 g, was added to the mixture with stirring, and heated to reflux for 5-6 hours. Hexamethyldisilazane (Dow Corning), 3.05 g was added and stirred for an additional 2 hours. The solution was cooled to room temperature and analyzed for solids and viscosity.

Example 21

Silicone-acrylic hybrid polymers prepared according to Examples 2-6, 12, 16, 17 and 21 were evaluated for their adhesion performance on stainless steel (HC) and low density polyethylene (LDPE) panels in accordance with Adhesive Tape Board Test Methods PSTC-16 for peel strength, PSTC-101 for initial loop tack and PSTC-107 for shear strength at 22 ° C and 50% relative humidity. Table 1 summarizes the test results for various silicone-acrylic hybrid adhesives versus two pure silicone pressure-sensitive adhesives available from Dow Corning under the trade designation BIO-PSA® 7-4202 and 7-4302.

Table 1
Samples 2 3 4 5 6 12 16 17 21 7-4202 7-4302
HC 180º Peel (oz / in (g / mm))
20 min 16.91 (18.87) 7.58 (8.46) 2.38 (2.66) 11.24 (12.55) 17.24 (19.24) 33.75 (37.67) 34.21 (38.18) 23.09 (25.77) 11.24 (12.55) 12.53 (13.99) 7.73 (8.63)
24 hours 14.86 (16.59) 19.11 (21.33) 2.25 (2.51) 6.50 (7.25) 17.77 (19.83) 32.47 (36.24) 38.95 (43.47) 19.88 (22.19) 6.50 (7.25) 13.75 (15.35) 6.29 (7.02)
1 week 18.21 (20.32) 14.43 (16.11) 2.49 (2.78) 3.33 (3.72) 17.90 (19.98) 37.00 (41.30) 39.96 (44.60) 27.1 (30.25) 3.33 (3.72) 14.45 (16.13) 8.46 (9.44)
LDPE 180º Peel (oz / in (g / mm))
20 min 14.54 (16.23) 8.97 (10.01) 1.33 (1.48) 13.53 (15.10) 16.17 (18.05) 26.80 (29.91) 9.04 (10.09) 7.91 (8.83) 13.53 (15.10) 13.79 (15.39) 7.40 (8.26)
24 hours 15.90 (17.75) 14.32 (15.98) 2.60 (2.90) 7.88 (8.80) 17.75 (19.81) 32.47 (36.24) 30.84 (34.42) 24.31 (27.13) 7.88 (8.80) 12.75 (14.23) 10.92 (12.19)
1 week 18.41 (20.55) 17.80 (19.87) 1.47 (1.64) 12.53 (13.99) 18.17 (20.23) 30.57 (34.12) 28.66 (31.99) 25.71 (28.70) 12.53 (13.99) 15.19 (16.95) 9.29 (10.37)
Initial loop tack (oz / inch (g / mm)) 15.46 (17.26) 4.19 (4.68) 12.93 (14.43) 10.62 (11.85) 19.95 (22.27) 35.26 (39.35) 19.04 (21.25) 16.58 (18.50) 10.62 (11.85) 0.77 (0.86) 4.67 (5.21)
Offset (4.4 psi 2 (30.3 kPa) hr) 2.74 > 168 0.28 > 168 9.53 > 168 > 168 > 168 > 168 34.45 1.17

For these silicone and silicone-acrylic hybrid adhesives, tack test measurements were also obtained using the TA Instruments Texture Analyzer® at either zero hold time or 10 second hold time.The results are shown in Table 2.

Table 2
Samples 2 3 4 5 6 7-4202 7-4302
Peak Force (g), no hold 18.78 78.45 121.79 21.01 51.10 53.14 34.34
Peak force (g), 10 second hold 28.68 169.74 167.49 30.17 89.89 60.96 46.08

As the data in Tables 1 and 2 demonstrate, the invention provides adhesives exhibiting a wide range of pressure-sensitive adhesive properties.One preferred composition, Example 12, exhibits very high levels of peel, tack and shear characteristics and is superior to the commercial pure silicone POS adhesives demonstrated by comparison.

Example 22

The performance characteristics of the silicone-acrylic blended adhesive of Comparative Example 10 and the silicone-acrylic hybrid adhesives (Examples 11 and 12) were analyzed. Table 3 shows the peel, tack and shear data for the compositions of Examples 10, 11 and 12, determined in accordance with the above description.Dynamic mechanical analysis (DMA) for Comparative Example 10 and Examples 11 and 12 showed different mechanical behavior as shown in Figure 1. The most notable difference between the silicone-acrylic unreacted mixture and the silicone-acrylic reacted hybrid is observed for the storage modulus curves. The storage modulus for the silicone-acrylic blend (Example 10) decreased as the temperature increased, and there was no modulus plateau. However, the storage modules for silicone-acrylic hybrids (examples 11 and 12) show a plateau after passing through the glass transition region as the temperature increases.The module plateau for silicone-acrylic hybrid polymers is clearly indicative of a reaction between the silane functionality on the acrylic polymer and the silicone polymer and / or MQ resin, which increases the overall crosslink density.

DMA data in FIG. 1 also demonstrate the achievement of higher levels of reaction between the three components when using a stronger base (KOH, example 12) in comparison with a weaker base (ammonium carbonate, example 11), as evidenced by the much higher plateau modulus for example 12 in comparison with example 11.The improved response in the case of a stronger base also results in superior peel, tack and shear characteristics (compare the data in Table 3 for Examples 11 and 12).

Table 3
Samples 10 11 12
HC 180º Peel (oz / in (g / mm))
20 min 12.24 (13.66) 10.82 (12.08) 33.75 (37.67)
24 hours 13.52 (15.09) 12.21 (13.63) 32.47 (36.24)
1 week 14.92 (16.65) 13.49 (15.06) 37.00 (41.30)
LDPE 180º Peel (oz / in (g / mm))
20 min 12.74 (14.22) 10.57 (11.80) 26.80 (29.91)
24 hours 12.12 (13.53) 9.54 (10.65) 32.47 (36.24)
1 week 14.41 (16.08) 12.44 (13.88) 30.57 (34.12)
Initial loop tack (oz / in (g / mm)) 17.09 (19.07) 25.57 (28.54) 35.26 (39.35)
Offset (hour), 1/2 ” (12.7 mm) x 1 ” (25.4 mm) x 1000 g / room temperature (4.4 psi 2 (30.3 kPa) )) 1.12 0.19 > 168

As illustrated in FIG.2, Example 16 revealed a different mechanical behavior. The storage moduli for the silicone-acrylic hybrid made from the stepwise addition of each component showed a plateau after passing through the glass transition region with increasing temperature. This plateau indicated a reaction between the silane functionality on the acrylic polymer and the silicone polymer and / or MQ resin, which increased the overall crosslink density.

Several silicone-acrylic hybrid polymers prepared according to Example 16 were subjected to phase separation tests.The samples were left in the test tube and the number of days it took to separate into two different layers is recorded in Table 4. As the data in Table 4 demonstrate, the stepwise hybrid polymer reproducibly showed no visible phase separation for more than 30 days.

Table 4
Sample number 16
Visible phase separation
(in days)
> 30,> 30,> 30,> 30,> 30

The phase stability test for the sample of Example 16 was also performed using a Beckman Coulter Allegra X-12 Centrifuge.Approximately eight ounces (227 grams) of the hybrid polymer from Example 16 was placed in a vessel and the vessel was loaded into a cup holder. After that, the sample from example 16 was rotated in a centrifuge at 2000 rpm for 30 minutes. There was no phase separation even after centrifugation, and the sample remained homogeneous (did not undergo phase separation) for more than one month.

Many modifications and variations can be made without departing from the spirit and scope of the present invention, which will be obvious to those skilled in the art.The specific embodiments described herein are presented by way of example only, and the invention should be limited only by the provisions of the appended claims, together with the full scope of equivalents to which such claims are entitled.

Acrylic insert in the bathtub Novosibirsk

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Bath insert – is it?

Acrylic bathtub insert, acrylic insert , bathtub to bathtub, bathtub insert – these are all the different names that the acrylic bathtub insert deservedly has.The only difference from the stand-alone acrylic bathtub is that your old bathtub is used as a strength frame (strong stable base) for the acrylic layer, and not a layer of epoxy resin. This technology has many advantages, since it combines the qualities of both cast iron and acrylic bathtubs.

Installation of the insert takes only 2 – 2.5 hours, after which the protective film is removed from the surface of the new bath, and the bath is filled with water for 24 hours.A day later, it can be used as usual …

Acrylic bath insert is factory-cast from an environmentally friendly polymer. Acrylic bath liners are made in accordance with GOST sizes, so they can be installed in all domestic-made bathtubs. Acrylic liners are made from a two-layer sheet, the top layer is sanitary acrylic, which has an aesthetic appearance and excellent physical properties, it is reinforced with a bottom layer of ABS plastic, which has all the qualities of a high-tech structural polymer.For the production of inserts and bathtubs, we use a two-layer polymer material (ABS / PMMA 6 mm thick) that meets the requirements of TU 2246-093-00203387-07 from raw materials from BASF with the use of dyes from KAFRIT Industries. The service life of this material is at least 20 years.

When installing the insert, your bathtub acquires the following series of properties and advantages over cast iron bathtubs:

  • Acrylic provides increased comfort.Due to the low thermal conductivity of the material, the temperature of the water in the bath drops very slowly, by about 1 degree in 30 minutes. For example, in a cast iron bath, heat loss is 1 degree in 3 minutes. There is a tenfold improvement in the indicator.
  • Any cast-iron, even an expensive bathtub has casting irregularities, and the enamel with which this bathtub is covered repeats all these irregularities. The acrylic liner is free from this drawback and has a perfectly smooth glossy surface. This is important for aesthetic perception.
  • The enamel applied to the metal does not have a dirt-repellent effect and therefore such a bath must be washed with special detergents, often abrasive, with considerable effort. After such a procedure, micro-scratches appear on the enamel, and the dirt penetrates deeper into the enamel. Any plaque and dirt, both organic and inorganic, can be washed off from an acrylic bath very easily with a sponge and any liquid detergent, leaving no residue.
  • Acrylic is an absolutely environmentally friendly material that is pleasant in contact with the body.
  • Acrylic has a sound-absorbing property, dampens the unpleasant sound of pouring water, characteristic of metal bathtubs.
  • The surface of the insert, unlike conventional bathtubs, can be easily restored using auto polish or a special polishing paste. Even with such a nuisance as large cracks, you can easily handle it yourself.
    Your bathtub is like new again!

The main advantage of the acrylic insert is the elimination of damage in the bathroom, the absence of dismantling and violation of the integrity of the floor and walls in the bathroom, which is inevitable when replacing an old bathtub.A bathtub with an acrylic insert is higher in its performance and aesthetic qualities than a conventional cast iron, enamelled bathtub.

The installation of the acrylic insert requires special attention.

To install the insert, you need an impressive experience of qualified workers who are well versed in the specifics of installing the product. An important role is played by the accuracy of the distribution of the waterproofing components, as well as the use of original Henkel adhesives.The service life of the installed liner directly depends on this. The Expert-N company offers the services of professionals who will install the acrylic liner correctly, quickly and efficiently.

You can find the prices for acrylic insert in the Price List …

Acrylic insert in the bath – types of inserts, reviews and manufacturers

As you know, it is the bathtub, as the most eye-catching element of the bathroom, that most of all influences the overall perception of the space.The acrylic insert in the bath , , as confirmed by consumer reviews, is one of the repair methods that allows you to get new equipment with a small investment.

Steel and especially cast iron bathtubs, which were installed in the bathrooms of Soviet-built houses, were not particularly distinguished by a variety of shapes and sizes. They were characterized by high weight and wall thickness, which provided products with excellent mechanical strength, which in some cases surpasses modern samples.

But there is nothing eternal in this world, and time has left its mark on the condition of these products. Cracked, half-erased enamel of an incomprehensible color, deeply ingrained dirt begin to irritate its owner. Acrylic bath liners will allow you to return it to its original appearance and extend the operating time by a dozen years.

What is a bath insert?

Acrylic insert – quick way to restore the bath

The technology of bath recovery using the synthetic polymer methyl methacrylate was developed in the second half of the sixties of the twentieth century.A fairly simple repair method, when a new bathtub is placed on top of the old one with a special adhesive, allows you to get the best result at minimal cost. Due to the properties of the material, the acrylic insert in the old bathtub allows copying the shape of the original and gives the product some additional useful properties:

  • The glossy polymer surface has no pores and does not absorb dirt, which serves as a breeding ground for bacteria, as a result of which the surface is very hygienic and does not require treatment with aggressive detergents;
  • The ability of the material to withstand small plastic deformations is successfully used in cases where it is necessary to install an acrylic insert in a steel bath, the bottom of which can bend slightly;
  • Chemical inertness of polymerized derivatives of acrylic acid allows you not to worry about the state of the surface when choosing detergents;

Acrylic bath liner used during repairs is necessarily made in an industrial environment on specialized equipment capable of maintaining the required technological parameters.Even a slight deviation from the technology dramatically reduces the mechanical properties of the product without changing the appearance of the product.

Important! An insert made in violation of technology or of poor-quality material can become brittle and cracked in the first months of operation, which will entail the need for expensive repairs or complete replacement of equipment.

Types of inserts used in the repair

Among the many methods of manufacturing methyl methacrylate parts, manufacturers use the following most often:

Cast insert

Making a cast liner by pressing

The first is the so-called cast method, when an acrylic bathtub is “cast” from a thick sheet of acrylic heated to the required temperature by the method of vacuum forming, repeating the shape of the original as closely as possible.The shaping is carried out on a polished aluminum matrix, which ensures a high gloss of the final product. The lining can also be molded over a matrix of a heat-resistant synthetic composite, which, due to the lower cost and laboriousness of processing, replaces aluminum models.

Products made on different matrices cannot be distinguished externally, and the lower cost of the composite mold affects the final cost, which is beneficial for both the manufacturer and the consumer.

However, an acrylic bathroom insert made using a cast technology by an unscrupulous manufacturer from a thinner than necessary polymer sheet is fraught with several hidden dangers.Stretching the heated polymer over the shape of the matrix leads to a decrease in the wall thickness. If the manufacturer uses a material that is thinner than necessary, the walls may be so thin that they may not withstand the load even with the water taken into the bath. Therefore, when buying an acrylic “insert” in your bathtub, it is worth asking what is the initial thickness of the material from which it is made. If the seller does not provide such information, you can see the approximate thickness of the sheet on the sides, but it is better to refrain from such an acquisition, despite the arguments of the installers that the liner will rest on the metal walls of the old bath.

Inserts made of ABS plastic

Insert liner made of durable ABS plastic is cheaper than liquid filling

The second manufacturing method used by manufacturers of acrylic bath liners is to use cheaper ABS plastic, which is the basis of the finished product, covered with a thin layer of acrylic. The technological process of applying acrylic makes it possible to obtain a strong monolithic joint, in which the materials cannot be torn off from each other without destruction.Despite the monolithic design, the plastic insert in the bathtub made using this technology has one significant drawback.

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The thickness of the acrylic layer, as a rule, does not exceed 0.2-0.3 mm and the slightest damage or scratch will require complex repair. And if a thick layer of acrylic can be relatively easily polished, then in the case of using ABS plastic co-extruded with acrylic, special materials and rather complex repair technologies will be required.

Such products are cheaper than acrylic ones, have a similar initial appearance, but their service life is much shorter. The insert, the manufacturing technology of which involves the use of a base made of ABS plastic, is easier to mold than products made of pure acrylic, which is used by manufacturers to the maximum extent to simplify the technological process.

Vinyl earbuds

Technology for installing vinyl liner

Some buyers are looking for vinyl bath liners for refurbishment.This is a somewhat erroneous understanding of the name of construction materials, which is common among non-specialists. Vinyl is the common name for polyvinyl chloride, a material other than acrylic that is widely used in windows, clothing, car awning fabrics, artificial leather and building materials, but has nothing to do with plumbing fixtures.

The high popularity gained by the quick bath-to-bath method, used in the restoration of old plumbing fixtures, determines the presence of a wide range of products in the production program of many manufacturers.More than twelve types of inserts are supplied to retail chains. Manufacturers offer plastic bathroom inserts for almost all cast iron and steel models that were installed in Soviet-built houses and for some more modern models.

Difficulty in the selection may arise for the owners of apartments of the so-called Stalinist buildings. For example, there is hardly a ready-made “sit-down” insert for a one-room “stalinka” bathtub, where bathtubs of non-standard sizes were used.

Please note: If the plastic insert in the bath does not fit the size or configuration of the installed plumbing fixture, you will have to use the method of restoring the bath with liquid acrylic, or buy new equipment.

Major manufacturers of quality liners

Products of foreign manufacturers are often not suitable for domestic baths

The possibility of inexpensive repair of worn enamel using the bath-in-bath method, and even with the possibility of improving the performance of the installed equipment, causes an increased demand among buyers for plastic linings for the bath, which, with certain skills, can be installed independently.As you know, demand creates supply.

Products of foreign manufacturers generally do not fit the size of Soviet metal baths, made in compliance with GOSTs and having strictly defined dimensions, and the quality of installation of the product and the durability of its operation depend on how exactly the base and the plastic insert in the bath match each other.

Domestic enterprises, using technologies and materials from Dutch, German and British firms, have launched the production of high-quality products adapted to domestic standard sizes of sanitary equipment.The domestically produced acrylic insert for the bathroom is no different from the imported one in quality, but it is much more affordable and cheaper.

Advice: Moscow “LLC ISKomp”, which produces high-quality white and colored liners for the bathtub, Togliatti firms “Plastall” and “SevenLux” have recommended well in the market of repair kits for bathtubs. Cherepovets “Multiplast” keeps up with them and manufactures a wide range of products for bathroom-to-bathroom repair technology. The North of the European part of the country provides high-quality products to the St. Petersburg enterprise “Grand Plast”.

These enterprises have their own extensive network of dealerships and directly cooperate with many well-known construction companies in the regions, which have a sufficient staff of highly qualified specialists who are able to correctly measure and install an acrylic liner in the bathroom in the shortest possible time. The options for the work performed are shown in the photo, and the factory warranty for the installed product will be a pleasant bonus for the consumer.

Is it worth the candle?

Acrylic liner extends bath life but requires gentle handling

How much does a bathroom insert cost if this technology has become so popular? If we take into account the cost of dismantling and disposal of the old bathtub, the cost of purchasing new equipment, then even taking into account all the additional costs, the cost of an acrylic insert in the bathtub will be from 35 to 50% of the cost of a new bathtub with a very high quality of the repaired product.

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And although the cost of an acrylic insert in a bath is much higher than the cost of materials for enameling, including bulk acrylic compositions, this method of repair provides such a long service life of the refurbished equipment that it is comparable to the service life of a new product, and bulk technologies can only delay the need for replacement by 5 – 7 years.

When calculating the budget for the upcoming repair, it is necessary not only to take into account how much the insert in the bathtub costs, but also to clarify the costs of paying the installer, because the service life of the repaired bathtub depends on the quality of the installation and the type of adhesive materials used.

Important! The negative reviews that have appeared on the network that the liner has peeled off from the base, eloquently indicate that some, if I may say so, “masters” use the addition of ethylene glycol to ordinary polyurethane foam intended for completely different work.

Can you install the insert yourself?

Self-installation will save a little

You can install the insert in the bathtub, as shown in the video, by yourself, having correctly indicated to the manufacturer the dimensions of the installed equipment.For exact observance of the technology, it is necessary to watch the training video several times and conditionally perform all the necessary actions right in the bathroom with imitation of all technological operations.

If it turns out to fit into the time frame provided for by the technology, then the insert into the old bath can be installed independently, but when there is no confidence in the quality of the work, it is better to invite a specialist.

Before placing the acrylic insert in the bathtub, all preparatory operations must be done very carefully.Free the sides of the bathtub to the required height and width, clean the surface of the old enamel from grease contamination, rust and limescale, because the adhesive strength will depend on this, so that the acrylic insert for the bathroom does not come off during operation.

After gluing the insert and installing the drain plumbing fittings, do not forget that the plastic insert in the bathtub must be filled with water to a certain level to create a pressing force and even distribution of the glue until it dries completely.After the time specified in the instructions has elapsed, you can use the bath in full and enjoy the results of your own labor.

Pros and cons of installing a tab

The plastic insert can come off if the technology is not followed

Overhead acrylic bathtubs allow you to repair old equipment that is absolutely unsuitable for further use with an erased enamel layer and numerous chips, while obtaining undeniable advantages:

  • A robust metal frame, combined with a high-quality acrylic coating, combines the positive qualities of both materials, leveling their disadvantages;
  • Slip-on bathtubs in an old bathtub can be mass-painted in one of the six colors offered by the manufacturer, which expands the color options for interior designers;
  • Thermal conductivity is significantly reduced, which increases the duration of taking water procedures without adding hot water and leads to direct cost savings;
  • By installing acrylic bathtubs on an old bathtub, the owner gets 50% or more savings in equipment replacement costs, excellent appearance and performance of a full-fledged acrylic bathtub;
  • Liner life is comparable to a new product.

But this repair method also has its drawbacks:

  • Low resistance of the liner surface to sharp objects and abrasive materials;
  • An overhead bath can come off the base if the technology is not followed and low-quality adhesives are used;
  • Aggressive cleaning fluids can degrade the appearance of the surface, necessitating repairs.

Conclusion

An acrylic bath insert is a good way to bring back to life seemingly irretrievably time-damaged equipment and to optimize the cost of renovating such a complex apartment as a bathroom.You can easily find the answer to the question of how much an insert in a bathtub costs in the price lists of manufacturers.

MASTIX – Professional

To use Mastix adhesive compositions in production conditions, it is necessary to develop a technological process for assembling the product. In order for the process of adaptation of your production to the use of adhesive assembly technologies to take place with the least labor intensity and cost, Mastix specialists suggest that you familiarize yourself with the main stages of the technological process for assembling adhesive joints:

  1. preparation of surfaces for bonding;
  2. selection and preparation of glue;
  3. applying glue;
  4. connection assembly;
  5. glue curing;
  6. quality control of gluing.

At the stage of preparing the surface for bonding, it is necessary to achieve maximum surface wettability with the adhesive. Distinguish between physical and chemical surface treatment. The most common physical preparation in real production conditions is mechanical surface treatment: blade, abrasive, metal brush, sand and shot blasting.

Chemical treatment usually includes degreasing (swab, watering, spraying, dipping into a bath, in a Soxhlet apparatus, in solvent vapors, etc.)). When gluing dissimilar materials, in some cases, resort to the use of adhesive primers.

Degreasing is used after mechanical processing, and in cases of gluing highly oily parts, they are degreased before and after mechanical processing. The surface prepared for gluing should not have pronounced mechanical defects, scale, oily contamination, rust and other defects that reduce the contact of the adhesive with the surface or can serve as stress concentrators in the joint.The roughness of the surface for bonding is recommended in the range Ra = 1.6 – 3.2.

It is recommended to carry out mechanical preparation of the surface at least 24 hours before gluing, which has a positive effect on the strength characteristics of the adhesive joint; over time, an oxide film forms in the air in metals, which reduces the activity of the treated surface.

Organic solvents (acetone, gasoline, kerosene, white spirit, etc.) are used for degreasing.) or aqueous cleaning solutions containing surfactants. The latter are more efficient and cheaper, but require special equipment and longer processing times.

At the stage of selection and preparation of the adhesive, it is necessary to take into account the chemical compatibility of the connection elements. For production conditions, it is more convenient to choose one-component adhesives that are prepared by the glue manufacturer. It is recommended to prepare multi-component adhesives just before assembly. Usually, two or more components of the adhesive are thoroughly mixed in the proportion specified by the manufacturer of the adhesive.The main advantage of multi-component adhesives is the long shelf life when unmixed. Once the components have been connected, the pot life of the adhesive is limited. Mastix multi-component adhesives are made on the basis of epoxy resins, after mixing it is recommended to use them within 30 – 40 minutes.

When choosing an adhesive, one is guided by its modulus of elasticity and coefficient of thermal expansion in the hardened state. These figures are compared with those of other connection parts in real working conditions.

The adhesive and the material of the connection parts must be compatible, not corrosive and destructive, form a galvanic pair, etc.

It is recommended to use rigid adhesives for static-loaded joints and elastic adhesives for dynamic-loaded joints.

At the stage of glue application, the method of its application is determined, it depends on the viscosity of the glue composition and is carried out by various methods depending on the serial production. When choosing a method of applying glue, it is necessary to take into account the overall dimensions of the surfaces to be glued, the type and general equipment of the production, the performance of the equipment, the state and properties of the glue, the type of the resulting joint.

For manual application of glue, various rollers, spatulas, brushes, swabs, nozzles, etc. are used. Cold welds are cut with a knife, scissors, guillotines, etc. In mechanization and automation of work, various dispensers equipped with a nozzle or spray systems are used. When applying glue, they maintain the continuity and thickness of the glue layer, the uniformity of application along the entire trajectory, since the strength of the connection depends on this. The number of surfaces lubricated with glue is taken into account.The main criterion for applying glue is the thickness of the glue layer. For Mastix anaerobic and acrylic adhesives, it is recommended to create glue lines with a thickness of 0.1 … 0.3 mm, for epoxy adhesives 0.05 – 0.5 mm. For cold welding, the thickness of the adhesive layer is not limited.

When repairing joints and sealing cracks, to increase the strength of the glue seam, the glue is reinforced with fiberglass. In this case, the fiberglass is applied to a layer of glue, and then the upper surface of the fiberglass patch is coated with glue.For these purposes, epoxy compositions and cold welding are usually used.

At the stage of installation of the connection, equipment is selected to fix the parts to be glued in the desired position. In this case, it is necessary to achieve the greatest contact between the surfaces to be glued and displace air bubbles from the contact zone. If the requirement for the relative position of the parts, imposed on the assembled unit, is not ensured, then the structure will have to be disassembled. Removing the bonded joint is laborious and requires re-surface preparation, making it difficult to maintain dimensional stability.The fixtures used during the assembly must ensure the desired direction of pressure and ensure exposure until “hand curing”, ie. until the assembled unit can be transported. To obtain a high-quality adhesive composition, it is necessary to maintain the temperature regime until the glue is completely cured. In some cases, the glue joints are “rubbed in” after the glue has been applied until the glue is evenly squeezed out.

When assembling connections, various clamps and presses are used to create high pressures.To create low pressures – springs, movable rollers, clamps, tightening with soft wire. In some cases, the assembly to be assembled is fixed on the bushings under the pressure of its own weight.

At the stage of glue curing, it is necessary to provide the required modes, which is determined by its chemical base. The curing process is influenced by many factors. The negative influence is exerted by: temperature drops, high humidity, atmospheric corrosion, overestimated loading rate. During curing, the adhesive is very sensitive to the action of chemicals.As a result of the negative impact of the above factors, uneven zones are formed in the glue seam, the stresses are distributed unevenly, which leads to premature failure of the glued unit. The main parameters that are taken into account during curing are temperature and time. The greatest strength of the adhesive compositions of the Mastix company is achieved by curing at room temperature 20 – 25 about C, within 24 hours. However, the operation of the assembled joints can begin after 8 hours, when the adhesive compositions provide 80-85% of the declared strength.Cold welds provide similar strength within 2 to 3 hours after mixing. The use of heaters in the assembly area significantly speeds up the curing process. If it is necessary to reduce the time of the curing process, it is considered promising to use high-frequency currents or blowing the assembled units with a jet of hot air.

Quality control of gluing of non-critical joints is carried out visually. Responsible joints are subjected to tests, which are divided into non-destructive and destructive.Non-destructive testing is based on the use of radioactive and X-ray radiation, acoustic and ultrasonic resonance, electron microscopy, electron emission, infrared and laser radiation, holography, measurement of electrical resistance and dielectric constant, measurement of thermal conductivity. Non-destructive tests allow assessing the state of the adhesive joint by indirect factors: the presence of voids in the adhesive joint, the stress state of the adhesive joint, the presence of foreign inclusions, molecular orientation in the joint, etc.p. Destructive tests are carried out on a representative sample, which is manufactured according to the general technology with the entire batch of glued assemblies. Depending on the operating conditions of the product, a load diagram for the destructive test is developed.

There are three types of damage to the adhesive bond:

  1. adhesive, in which the destruction of the adhesive seam occurs along the interface “adhesive – substrate”. This type of destruction indicates the wrong choice of glue or insufficient preparation of the surface for gluing;
  2. cohesive failure.In this fracture, the crack passes either through the substrate or through the mass of the adhesive. This indicates a good preparation of the surface for gluing, the correct choice of glue and careful observance of the entire technological process of assembling the glue joint;
  3. mixed destruction. In this case, the crack passes arbitrarily through the “substrate – glue” interface, which indicates a high-quality connection of materials.

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