Acrylic Plastic

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Background

Acrylic plastic refers to a family of synthetic, or man-made, plastic materials containing one or more derivatives of acrylic acid. The most common acrylic plastic is polymethyl methacrylate (PMMA), which is sold under the brand names of Plexiglas, Lucite, Perspex, and Crystallite. PMMA is a tough, highly transparent material with excellent resistance to ultraviolet radiation and weathering. It can be colored, molded, cut, drilled, and formed. These properties make it ideal for many applications including airplane windshields, skylights, automobile taillights, and outdoor signs. One notable application is the ceiling of the Houston Astrodome which is composed of hundreds of double-insulating panels of PMMA acrylic plastic.

Like all plastics, acrylic plastics are polymers. The word polymer comes from the Greek words poly, meaning many, and meros, meaning a part. A polymer, therefore, is a material made up of many molecules, or parts, linked together like a chain. Polymers may have hundreds, or even thousands, of molecules linked together. More importantly, a polymer is a material that has properties entirely different than its component parts. The process of making a polymer, known as polymerization, has been likened to shoveling scrap glass, copper, and other materials into a box, shaking the box, and coming back in an hour to find a working color television set. The glass, copper, and other component parts are still there, but they have been reassembled into something that looks and functions entirely differently.

The first plastic polymer, celluloid, a combination of cellulose nitrate and camphor, was developed in . It was based on the natural polymer cellulose, which is present in plants. Celluloid was used to make many items including photographic film, combs, and men's shirt collars.

In , Leo Baekeland developed the first commercially successful synthetic plastic polymer when he patented phenol formalde-hyde resin, which he named Bakelite. Bakelite was an immediate success. It could be machined and molded. It was an excellent electrical insulator and was resistant to heat, acids, and weather. It could also be colored and dyed for use in decorative objects. Bakelite plastic was used in radio, , and electrical equipment, as well as counter tops, buttons, and knife handles.

Acrylic acid was first prepared in . Methacrylic acid, which is a derivative of acrylic acid, was formulated in . When methacrylic acid is reacted with methyl alcohol, it results in an ester known as methyl methacrylate. The polymerization process to turn methyl methacrylate into polymethyl methacrylate was discovered by the German chemists Fittig and Paul in , but it wasn't until that the process was used to produce sheets of acrylic safety glass commercially. During World War II, acrylic glass was used for periscope ports on submarines and for windshields, canopies, and gun turrets on airplanes.

Raw Materials

Methyl methacrylate is the basic molecule, or monomer, from which polymethyl methacrylate and many other acrylic plastic polymers are formed. The chemical notation for this material is CH 2 =C(CH 3 )

3 . It is written in this format, rather than the more common chemical notation C 5 H 8 O 2 , to show the double bond (=) between the two carbon atoms in the middle. During polymerization, one leg of this double bond breaks and links up with the middle carbon atom of another methyl methacrylate molecule to start a chain. This process repeats itself until the final polymer is formed. (See Figure 1)

COOCH. It is written in this format, rather than the more common chemical notation C, to show the double bond (=) between the two carbon atoms in the middle. During polymerization, one leg of this double bond breaks and links up with the middle carbon atom of another methyl methacrylate molecule to start a chain. This process repeats itself until the final polymer is formed. (See Figure 1)

Methyl methacrylate may be formed in several ways. One common way is to react acetone [CH 3 COCH 3 ] with sodium cyanide [NaCN] to produce acetone cyanhydrin [(CH 3 ) 2 C(OH)CN]. This in turn is reacted with methyl alcohol [CH 3 OH] to produce methyl methacrylate.

Other similar monomers such as methyl acrylate [CH 2 =CHCOOCH,] and acrylonitrile [CH 2 =CHCN] can be joined with methyl methacrylate to form different acrylic plastics. (See Figure 2) When two or more monomers are joined together, the result is known as a copolymer. Just as with methyl methacrylate, both of these monomers have a double bond on the middle carbon atoms that splits during polymerization to link with the carbon atoms of other molecules. Controlling the proportion of these other monomers produces changes in elasticity and other properties in the resulting plastic.

The Manufacturing
Process

Acrylic plastic polymers are formed by reacting a monomer, such as methyl methacrylate, with a catalyst. A typical catalyst would be an organic peroxide. The catalyst starts the reaction and enters into it to keep it going, but does not become part of the resulting polymer.

Acrylic plastics are available in three forms: flat sheets, elongated shapes (rods and tubes), and molding powder. Molding powders are sometimes made by a process known as suspension polymerization in which the reaction takes place between tiny droplets of the monomer suspended in a solution of water and catalyst. This results in grains of polymer with tightly controlled molecular weight suitable for molding or extrusion.

Acrylic plastic sheets are formed by a process known as bulk polymerization. In this process, the monomer and catalyst are poured into a mold where the reaction takes place. Two methods of bulk polymerization may be used: batch cell or continuous. Batch cell is the most common because it is simple and is easily adapted for making acrylic sheets in thicknesses from 0.06 to 6.0 inches (0.16-15 cm) and widths from 3 feet (0.9 m) up to several hundred feet. The batch cell method may also be used to form rods and tubes. The continuous method is quicker and involves less labor. It is used to make sheets of thinner thicknesses and smaller widths than those produced by the batch cell method.

We will describe both the batch cell and continuous bulk polymerization processes typically used to produce transparent polymethyl methacrylic (PMMA) sheets.

Batch cell bulk polymerization

1. The mold for producing sheets is assembled from two plates of polished glass separated by a flexible "window-frame" spacer. The spacer sits along the outer perimeter of the surface of the glass plates and forms a sealed cavity between the plates. The fact that the spacer is flexible allows the mold cavity to shrink during the polymerization process to compensate for the volume contraction of the material as the reaction goes from individual molecules to linked polymers. In some production applications, polished metal plates are used instead of glass. Several plates may be stacked on top of each other with the upper surface of one plate becoming the bottom surface of the next higher mold cavity. The plates and spacers are clamped together with spring clamps.
2. An open comer of each mold cavity is filled with a pre-measured liquid syrup of methyl methacrylate monomer and catalyst. In some cases, a methyl methacrylate prepolymer is also added. A prepolymer is a material with partially formed polymer chains used to further help the polymerization process. The liquid syrup flows throughout the mold cavity to fill it.
3. The mold is then sealed and heat may be applied to help the catalyst start the reaction.
4. As the reaction proceeds, it may generate significant heat by itself. This heat is fanned off in air ovens or by placing the molds in a water bath. A programmed temperature cycle is followed to ensure proper cure time without additional vaporization of the monomer solution. This also prevents bubbles from forming. Thinner sheets may cure in 10 to 12 hours, but thicker sheets may require several days.
5. When the plastic is cured, the molds are cooled and opened. The glass or metal plates are cleaned and reassembled for the next batch.
6. The plastic sheets are either used as is or are annealed by heating them to 284-302°F (140-150°C) for several hours to reduce any residual stresses in the material that might cause warping or other dimensional instabilities.
7. Any excess material, or flash, is trimmed off the edges, and masking paper or plastic film is applied to the surface of the finished sheets for protection during handling and shipping. The paper or film is often marked with the material's brand name, size, and handling instructions. Conformance with applicable safety or building code standards is also noted.

Continuous bulk polymerization

1. The continuous process is similar to the batch cell process, but because the sheets are thinner and smaller, the process times are much shorter. The syrup of monomer and catalyst is introduced at one end of a set of horizontal stainless steel belts running parallel, one above the other. The distance between the belts determines the thickness of the sheet to be formed.

2. The belts hold the reacting monomer and catalyst syrup between them and move it through a series of heating and cooling zones according to a programmed temperature cycle to cure the material.
3. Electric heaters or hot air may then anneal the material as it comes out of the end of the belts.
4. The sheets are cut to size and masking paper or plastic film is applied.

Quality Control

The storage, handling, and processing of the chemicals that make acrylic plastics are done under controlled environmental conditions to prevent contamination of the material or unsafe chemical reactions. The control of temperature is especially critical to the polymerization process. Even the initial temperatures of the monomer and catalyst are controlled before they are introduced into the mold. During the entire process, the temperature of the reacting material is monitored and controlled to ensure the heating and cooling cycles are the proper temperature and duration.

Samples of finished acrylic materials are also given periodic laboratory analysis to confirm physical, optical, and chemical properties.

Toxic Materials, Safety
Considerations, and
Recycling

Acrylic plastics manufacturing involves highly toxic substances which require careful storage, handling, and disposal. The polymerization process can result in an explosion if not monitored properly. It also produces toxic fumes. Recent legislation requires that the polymerization process be carried out in a closed environment and that the fumes be cleaned, captured, or otherwise neutralized before discharge to the atmosphere.

Acrylic plastic is not easily recycled. It is considered a group 7 plastic among recycled plastics and is not collected for recycling in most communities. Large pieces can be reformed into other useful objects if they have not suffered too much stress, crazing, or cracking, but this accounts for only a very small portion of the acrylic plastic waste. In a landfill, acrylic plastics, like many other plastics, are not readily biodegradable. Some acrylic plastics are highly flammable and must be protected from sources of combustion.

The Future

The average annual increase in the rate of consumption of acrylic plastics has been about 10%. A future annual growth rate of about 5% is predicted. Despite the fact that acrylic plastics are one of the oldest plastic materials in use today, they still hold the same advantages of optical clarity and resistance to the outdoor environment that make them the material of choice for many applications.

Where To Learn More

Books

Baird, Ronald J. and David T. Baird. Industrial Plastics. The Goodheart-Willcox Company, .

Cowie, J.M.G. Polymers: Chemistry and Physics of Modern Materials. Chapman and Hall, .

Encyclopedia of Polymer Science and Engineering, Volume 1. John Wiley & Sons, .

Rosato, Dominick V. Plastic Encyclopedia and Dictionary. Hanser Publications, .

Seymour, Raymond B. Engineering Polymer Sourcebook. McGraw-Hill, .

Smith, Edward H., ed. Mechanical Engineer's Reference Book. Society of Automotive Engineers, .

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Acrylic Sheet: Ultimate FAQ Guide

Acrylic plastics are getting more popular day by day. Being a leading manufacturer in this industry, we get tons of questions about acrylics every day.

In this guide, we&#;ll answer the most commonly asked question about acrylic plastic. The goal of this guide is to make it easy for our readers to find their desired information. So without further adieu, let&#;s jump right into it.

What is acrylic plastic?

Acrylic plastic or Poly Methyl Methacrylate is a transparent and robust material used in various applications and glass replacement. The strength, workability, and resistance ability make it popular and used widely. It is also known as plexiglass, perspex, PMMA, and many other names.

It is similar to the polycarbonate sheet but different. Want to know the difference between polycarbonate and acrylic sheet.

How is acrylic plastic manufactured?

It can be made in two different ways, cast and extruded. The casting method is more labor-intensive and requires more time to produce. In this method, two large-sized glass is used as a mold to shape the raw material into a sheet.

On the other hand, the extruded method is more dependent on large machines and automated processes. The process is fast and the price of final products is lower than the casting method.

Want to know the difference between cast and extruded acrylic sheet.

What is the difference between acrylic and plastic?

With so many options and alternatives with transparent plastics, people often get confused about acrylic and plastic. Many people may think of acrylic as an alternative to plastic, which is not quite right.

Acrylic is a branch of plastic material. This means not all plastics are acrylic, but all acrylics are plastic materials. Want to know the difference between acrylic and polycarbonate.

Is acrylic stronger than plastic?

As we&#;ve stated above, acrylic is a plastic material. And among many plastic options, acrylic offers an incredible strength among the see-through plastic options. Along with polycarbonate sheets, it provides excellent stability, a longer lifespan, and durability.

Is acrylic a glass material?

Acrylic is rapidly taking over the glass and being used as a replacement of it widely. However, this is not a glass material at all. Acrylic is a polymethyl methacrylate plastic-type, which offers far more strength and workability than the glass material.

These plastics can be used as a better replacement for any glass applications like mirrors, glasses, door glass, sky windows, and all.

Is an acrylic sheet UV resistant?

The acrylic sheet is highly capable and one of the best choices when it comes to UV resistance. They can block harmful UV rays to a great extent while performing light transmission better than other plastic and glass materials.

This is the reason why acrylic sheets are so widely used in skylights and windows. Even very thin sheets of 5mm do not let UV rays to pass through. On the other hand, glass and most other plastic materials fail at this.

How long does acrylic plastic last?

The lifespan of these materials is significantly better than glass or other materials. It holds a superior strength and impacts resistance ability compared to other alternatives. Acrylic sheets are almost 15-20 times stronger than glass material while offering a longer lifespan and durability.

Related Blogs

Is acrylic plastic sustainable?

This is one of the strongest plastic materials with very high strength and durability. Compared to their alternatives like glass and many other plastics, acrylic offer better sustainability and durability. Which makes them perfect use for home and outdoor applications.

Is acrylic plastic waterproof?

Yes. They&#;re entirely waterproof material and can be used in both indoor and outdoor applications. It&#;s successfully used in skylights and windows for both waterproof and heat resistance capability.

Is acrylic sheets flammable?

Normally, yes. Although acrylic offers heat resistance to a great extent and is harmless when burned, it is advised to avoid using it where flames can occur regularly. Like industries where fireworks are done, you shouldn&#;t use acrylic sheets in windows or other applications. 

What is the melting point of acrylic plastic?

Acrylic or Plexiglas offers excellent heat resistance but can&#;t withstand extreme heat. Because the melting point of these is 160 degrees celsius. This is fair for a plastic material but not to the extent that we can say it&#;s burn-proof material.

How to cut thick acrylic plastic?

Cutting acrylic sheets is not a very hard thing to do when you know how to do it. If you&#;re new to our blog, feel free to check this guide out.

However, in short, jigsaws can be a better choice for cutting thick acrylic sheets. If you don&#;t have one, you could use a scoring knife or cutter to cut it. Compared to thin sheets, you&#;ll have to run the knife more times on the surface.

How to glue acrylic plastic together?

Gluing acrylic is one of the essential tasks to do while working with this material. You&#;ll need solvent-based glue for this material. Before gluing, you must ensure that the edges are even and polished to get the best result.

Don&#;t forget to use hand gloves and a needle to glue the sheets. Apply the glue carefully on the contact surface and hold the sheets accordingly.

One of the major mistakes people make is applying regular glue to the sheets, making a mess. There are plenty of adhesives you can find on the market that is designed for acrylic materials. Use those to get the best results.

How to remove super glue from the sheet?

Before you approach the glue, make sure the specks of dirt are wiped off from the surface with a soft cloth. Then use a thin blade or razor to peel off the glue. When the glue is removed, apply mild soap and wash the Plexiglas. If there are still any strains, use lemon and run it over the strained area.

What&#;s left?

We&#;ve covered the most asked question that we encounter every day. Did you find it useful? Or have we left anything behind? Let us know in the chat option and we&#;ll add the question to this guide or reply to you personally.

About UVPLASTIC

UVPLASTIC is a leading manufacturer of polycarbonate in China. Meantime, UVPLASTIC provides designing and machining polycarbonate service. The subsidiary-UVACRYLIC, which is a leading manufacturer of acrylic sheets in China, provides custom acrylic. If you are interested in these products, please contact us!

For more information, please visit Custom Acrylic Sheet China Manufacturer.

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