Polymethylmethacrylate (PMMA)
DATE：2019/12/11 9:03:51 / READ： / SOURCE：This station
Polymethylmethacrylate (PMMA)
Polymethyl methacrylate is polymerized from methyl methacrylate (MMA) according to a free radical or anionic mechanism. Generally, people call it plexiglass. Currently, free radical polymerization is used in industry, and its relative molecular mass is about 500,000 to 1 million. The abbreviation of polymethyl methacrylate is PMA.
Polymethyl methacrylate is divided into polymerization methods, and there are bulk and suspension polymerization methods, followed by solution and emulsion polymerization methods.
Performance characteristics of polymethyl methacrylate
Polymethyl methacrylate is one of the most important optical plastics. The optical transmittance in optical properties reaches 92%. PMMA products are colorless, have good coloring performance, wide color tone range, surface gloss, and do not change color under the action of heat. The resin has a small density, and the quality is light and strong. Alkali, inorganic salt, organic salt and grease etc .; good weather resistance; good electrical properties, no leakage, large surface resistivity, can be used for various electrical appliances; resin melt has good fluidity, can be used for extrusion , Injection molding and calendering molding products; products can be mechanically processed, can also be bonded, printing and dyeing, embossing and other processing.
The disadvantages of PMMA products are: low surface hardness, easy to scratch; large thermal expansion coefficient, water absorption, so the shape and size of the structure caused by temperature and humidity are large; easy to crack; easy to be charged and easy to vacuum
The properties of polymethyl methacrylate are shown in Table 1-51. Forming method of polymethyl methacrylate plastic product
Polymethyl methacrylate is made of suspension polymerized pellets (or powders), which can be used for extrusion, injection molding and compression molding; using bulk polymerized PMMA slurry, it can be made into profiles such as plates, rods and tubes by casting. .
The PMMA plate can be subjected to the second thermal processing, such as pressing into various lenses or changing into various shapes; it can also be used for bonding, welding or turning, drilling, etc.
machining
Third, the use of polymethyl methacrylate plastic products
Polymethyl methacrylate has excellent optical properties, and its products are widely used in 60% of areas that require good brightness, and have a certain strength of riot, vibration and easy observation.
Polymethyl methacrylate is polymerized from methyl methacrylate (MMA) according to a free radical or anionic mechanism. Generally, people call it plexiglass. Currently, free radical polymerization is used in industry, and its relative molecular mass is about 500,000 to 1 million. The abbreviation of polymethyl methacrylate is PMA.
Polymethyl methacrylate is divided into polymerization methods, and there are bulk and suspension polymerization methods, followed by solution and emulsion polymerization methods.
Performance characteristics of polymethyl methacrylate
Polymethyl methacrylate is one of the most important optical plastics. The optical transmittance in optical properties reaches 92%. PMMA products are colorless, have good coloring performance, wide color tone range, surface gloss, and do not change color under the action of heat. The resin has a small density, and the quality is light and strong. Alkali, inorganic salt, organic salt and grease etc .; good weather resistance; good electrical properties, no leakage, large surface resistivity, can be used for various electrical appliances; resin melt has good fluidity, can be used for extrusion , Injection molding and calendering molding products; products can be mechanically processed, can also be bonded, printing and dyeing, embossing and other processing.
The disadvantages of PMMA products are: low surface hardness, easy to scratch; large thermal expansion coefficient, water absorption, so the shape and size of the structure caused by temperature and humidity are large; easy to crack; easy to be charged and easy to vacuum
The properties of polymethyl methacrylate are shown in Table 1-51. Forming method of polymethyl methacrylate plastic product
Polymethyl methacrylate is made of suspension polymerized pellets (or powders), which can be used for extrusion, injection molding and compression molding; using bulk polymerized PMMA slurry, it can be made into profiles such as plates, rods and tubes by casting. .
The PMMA plate can be subjected to the second thermal processing, such as pressing into various lenses or changing into various shapes; it can also be used for bonding, welding or turning, drilling, etc.
machining
Third, the use of polymethyl methacrylate plastic products
Polymethyl methacrylate has excellent optical properties, and its products are widely used in 60% of areas that require good brightness, and have a certain strength of riot, vibration and easy observation.
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