How many kinds of plastics are there?
General engineering plastics include: polyamide, POM, polycarbonate, modified polyphenylene oxide, thermoplastic polyester, ultra high molecular weight polyethylene, methyl amyl polymer, vinyl alcohol copolymer, etc..Special engineering plastics are crosslinked and non crosslinked. The crosslinked types are poly amino bis maleic amide, poly three triazine, crosslinked polyimide, heat-resistant epoxy tree fingers and so on. Non crosslinked types are polysulfone, polyethersulfone, polyphenylene sulfide, polyimide and PEEK.
According to the different use characteristics of various plastics, plastics are usually divided into three types: general plastics, engineering plastics and special plastics.
Generally refers to a special function, can be used in aviation, aerospace and other special fields of plastic. Such as fluorine plastics and silicone, with outstanding resistance to high temperature, self-lubricating and other special functions, and enhance the plastic and foam plastic with high strength, high cushioning and other special properties, these plastics are in the category of special plastics.
Foam plastics can be divided into three kinds of hard, semi hard and soft foam. Hard foam without flexibility, compression hardness is very big, only up to a certain stress deformation, stress the lifting of restitution; soft foam rich flexibility, compression hardness is very small, very easy to deformation, stress release after can restore the residual deformation small; semi rigid foam between flexibility and other properties between hard and soft foam.
Plastic material can be divided into granular (such as calcium plastic reinforced plastic), fiber (such as glass fiber or glass cloth reinforced plastic), sheet (such as mica reinforced plastic) three. According to the material can be divided into cloth reinforced plastic (such as rags or reinforced asbestos reinforced plastics), inorganic mineral filled plastics (such as quartz or mica filled plastics), fiber reinforced plastics (such as carbon fiber reinforced plastics) three.
