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Categories of plastics

Time:[2012-7-4]     Views:3556
Many types of plastics, there are about 300 in the world, dropped into the production of plastic so far. Plastic classification method is more commonly used, there are two plastic Category:
1, according to the different nature of the plastic heat: Plastic classified into thermoplastics and thermosetting plastics
The molecular structure of the thermoplastic linear structure, easy to soften or melt when heated, plastic made ​​of a certain shape, cooled and then hardened. Such as polyvinyl chloride, polyethylene, polystyrene, and so on. The thermoplastic molding process is simple, continuous production, with very high mechanical strength, so the development of fast.
The molecular structure of the thermosetting plastic body structure also occur easily when heated, softened, plastic made ​​of a certain shape, but after heating to a certain extent, or add a small amount of curing agent, hardening stereotypes, reheating does not become soft and change shape. Thermosetting plastic molding, heat does not soften, and therefore can not be recovered for recycling, such as phenolics, amino plastics, epoxy resins belong to this type of plastic.
2, according to the different uses of plastics: plastic classification is divided into a general-purpose plastics and engineering plastics
GE Plastics is a large output, low prices, the most widely used plastic, including five varieties of polyolefin, polyvinyl chloride, polystyrene, phenolics, and amino plastics. People used to daily life are mostly made ​​of plastic products by GE Plastics.
Is engineering plastics can be used as structural materials instead of metal machine parts, such as plastic. For example, polyamide, polycarbonate, POM, ABS resin, PTFE, polyester, polysulfone, polyimide, etc.. Engineering plastics with low density, high chemical stability, good mechanical properties, excellent power to make edge molding process easily, which is widely used in automotive, electrical, chemical, machinery, apparatus, instruments and other industries, but also used in the Astronautical rockets, missiles and so on.
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