Classification of rubber materials for automotive plastic parts

　Rubber materials are divided into natural rubber and synthetic rubber. Natural rubber is mainly derived from the Hevea rubber tree. When the skin of this rubber tree is cut, milky white juice will flow out, which is called latex. The latex is coagulated, washed, molded, and dried to obtain natural rubber. Synthetic rubber is made by artificial synthesis, and different kinds of rubber can be synthesized by using different raw materials (monomers). From 1900 to 1910, chemist C.D. Harris (Harris) determined that the structure of natural rubber was a polymer of isoprene, which opened up a way for synthetic rubber. In 1910, the Russian chemist SV Lebedev (Lebedev, 1874—1934) polymerized 1,3-butadiene into butadiene rubber using sodium metal as an initiator. After that, many new synthetic rubber varieties appeared, such as Rushun. Butadiene rubber, neoprene rubber, styrene butadiene rubber, etc. The output of synthetic rubber has greatly exceeded that of natural rubber, of which the largest output is general-purpose styrene butadiene rubber.
　　 refers to the rubber species that partially or completely replace natural rubber, such as styrene butadiene rubber, butadiene rubber, isoprene rubber, etc., which are mainly used to make tires and general industrial rubber products. General-purpose rubber is in large demand and is the main variety of synthetic rubber.
　　Styrene butadiene rubber
　　 SBR [1] is made by copolymerization of butadiene and styrene. It is the largest general-purpose synthetic rubber produced. There are emulsion polystyrene butadiene rubber, solution polymerized styrene butadiene rubber and thermoplastic rubber (SBS).
Butadiene rubber
　　 is made by solution polymerization of butadiene. Butadiene rubber has particularly excellent cold resistance, abrasion resistance and elasticity, as well as good aging resistance. Butadiene rubber is mostly used in the production of tires, and a small part is used in the manufacture of cold-resistant products, cushioning materials, tapes, and rubber shoes. The disadvantages of butadiene rubber are poor tear resistance and poor wet skid resistance.
　　 isoprene rubber
　　 Isoprene rubber is the abbreviation of polyisoprene rubber, produced by solution polymerization. Isoprene rubber, like natural rubber, has good elasticity and abrasion resistance, excellent heat resistance and better chemical stability. The strength of isoprene raw rubber (before processing) is significantly lower than that of natural rubber, but its quality uniformity and processing performance are better than natural rubber. Isoprene rubber can replace natural rubber to make truck tires and off-road tires, and it can also be used to produce various rubber products.
　　 Ethylene Propylene Rubber
　　 Ethylene-propylene rubber is synthesized with ethylene and propylene as the main raw materials, and has outstanding aging resistance, electrical insulation properties and ozone resistance. Ethylene-propylene rubber can be filled with large amounts of oil and carbon black, and the product price is low. Ethylene-propylene rubber has good chemical stability, abrasion resistance, elasticity, and oil resistance close to styrene-butadiene rubber. Ethylene-propylene rubber has a wide range of uses. It can be used as tire sidewalls, rubber strips, inner tubes, and automotive parts, as well as wire, cable sheathing, and high-voltage and ultra-high-voltage insulation materials. It can also manufacture light-colored products such as rubber shoes and sanitary products.
　　 Neoprene
　　 It is made of chloroprene as the main raw material through homopolymerization or copolymerization of a small amount of other monomers. Such as high tensile strength, excellent heat resistance, light resistance, aging resistance, and oil resistance are better than natural rubber, styrene butadiene rubber and butadiene rubber. It has strong flame resistance and excellent flame retardancy, high chemical stability, and good water resistance. The shortcomings of neoprene are electrical insulation, poor cold resistance, and raw rubber is unstable during storage. Neoprene has a wide range of uses, such as making transportation belts and transmission belts, covering materials for wires and cables, making oil-resistant hoses, gaskets, and chemical-resistant equipment linings.

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