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The rubber has good comprehensive performance and is widely used. Mainly include: ①Natural rubber. It is made from the latex of the para rubber tree. The basic chemical composition is cis-polyisoprene. Good elasticity, high strength, and good overall performance. ② Isoprene rubber. The full name is cis-1,4-polyisoprene rubber. A high cis synthetic rubber made from isoprene. Because its structure and properties are similar to natural rubber, it is also called synthetic natural rubber. ③ SBR. Abbreviated as SBR, it is made by copolymerization of butadiene and styrene. According to the production method, it is divided into emulsion polymerization styrene butadiene rubber and solution polymerization styrene butadiene rubber. Its comprehensive performance and chemical stability are good. ④ Butadiene rubber. The full name is cis-1,4-polybutadiene rubber, abbreviated as BR, which is made by polymerization of butadiene. Compared with other general-purpose rubbers, vulcanized butadiene rubber has excellent cold resistance, abrasion resistance and elasticity, less heat under dynamic load, good aging resistance, and easy to use with natural rubber, neoprene rubber, nitrile rubber, etc.
Bromobutyl Rubber Stopper
The source and application characteristics of different special rubbers
Special rubber refers to rubber with certain special properties. Mainly include: ① Neoprene. Referred to as CR, it is made by the polymerization of chloroprene. It has good overall performance, oil resistance, flame resistance, oxidation resistance and ozone resistance. However, its density is relatively high, it is easy to crystallize and become hard at room temperature, it has poor storage properties and poor cold resistance. ②Nitrile rubber. Abbreviated as NBR, it is made by copolymerization of butadiene and acrylonitrile. It has good oil resistance and aging resistance. It can be used for a long time in the air at 120℃ or in oil at 150℃. In addition, it also has water resistance, air tightness and excellent bonding properties. ③Silicone rubber. The main chain consists of alternating silicon and oxygen atoms, with organic groups on the silicon atoms. High and low temperature resistance, ozone resistance, and good electrical insulation. ④Fluorine rubber. A synthetic rubber containing fluorine atoms in its molecular structure. It is usually expressed by the number of fluorine atoms in the fluorine-containing unit in the copolymer. For example, fluorine rubber 23 is a copolymer of vinylidene fluoride and chlorotrifluoroethylene. Fluorine rubber is resistant to high temperature, oil and chemical corrosion. ⑤Polysulfide rubber. It is formed by condensation polymerization of dihaloalkane and alkali metal or alkaline earth metal polysulfide. It has excellent oil and solvent resistance, but the strength is not high, the aging resistance, processability is not good, and it has odor. It is often used in combination with nitrile rubber. In addition, there are urethane rubber, epichlorohydrin rubber, acrylic rubber and so on.
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