Application principle of PMMA plastic materials
PMMA (Polymethyl Methacrylate) English name: PolymethylMethacrylate. PMMA resin is a non-toxic and environmentally friendly material, which can be used to produce tableware, sanitary ware, etc. It has good chemical stability and weather resistance. PMMA resin is not easy to produce sharp fragments when it is broken. The United States, Japan and other countries and regions have made mandatory regulations in the law, and PMMA resin must be used for building glass in primary, secondary, and elementary schools. At present, all parts of the country have accelerated the pace of urban construction, and street signs, advertising light boxes and telephone booths have appeared in large numbers. A considerable part of the materials used is PMMA resin. The outdoor colored building materials of the Beijing Olympics Project also used a large number of environmentally friendly PMMA resins.
Polymethyl methacrylate PMMA plastic raw materials-application range: automotive industry (signal light equipment, instrument panels, etc.), pharmaceutical industry (blood storage containers, etc.), industrial applications (video discs, light diffusers), electronic product buttons (especially transparent). Daily consumer goods (beverage cups, stationery, etc.). The application of plexiglass acrylic (acrylic) in the construction industry. In architecture, plexiglass acrylic (acrylic) is mainly used in building lighting, transparent roofs, roofs, telephone booths, stairs and room wall guards, etc.; Sanitary wares include bathtubs, washbasins, dressing tables and other products. In recent years, the application development in highway and high-grade road lighting lampshades and automotive lamps has also been quite rapid. Among them, the market for architectural lighting, bathtubs, street advertising light boxes and telephone booths has grown rapidly, and there will be more room for development in the future, with a very broad market prospect.
Polymethyl methacrylate PMMA plastic raw material-processing technology: drying treatment: PMMA is hygroscopic, so drying treatment before processing is necessary. The recommended drying condition is 90℃, 2~4 hours. Melting temperature: 240~270℃. Mold temperature: 35~70℃. Injection speed: medium. Chemical and physical properties PMMA has excellent optical properties and weather resistance characteristics. The penetration of white light is as high as 92%.
PMMA products have very low birefringence and are especially suitable for making DVDs. PMMA has room temperature creep characteristics. As the load increases and time increases, it can lead to stress cracking. PMMA has good impact resistance. Due to the shortcomings of PMMA surface hardness, easy scratching, low impact resistance, poor molding fluidity, etc., the modification of PMMA has appeared one after another. Polymethyl methacrylate PMMA plastic raw materials-physical properties: Polymethylmethacrylate (PMMA, English Acrylic), also known as acrylic or plexiglass, in Hong Kong is often called agaric glue, it The number average molecular weight of the cast plate polymer is generally 2.2;104, the relative density is 1.19-1.20, the refractive index is 1.482-1.521, the moisture absorption is below 0.5%, and the glass transition temperature is 105°C. It has the advantages of high transparency, low price, easy machining, etc. It is a commonly used glass substitute material.