The Source and Application Characteristics of Universal Rubber

Universal rubber has good comprehensive performance and is widely used. There are mainly: ① Natural rubber, made from latex from three leaf rubber trees, with a basic chemical composition of cis polyisoprene. Good elasticity, high strength, and good overall performance Isoprene rubber, also known as cis-1,4-polyisoprene rubber, is a highly cis synthetic rubber made from isoprene. Due to its similar structure and properties to natural rubber, it is also called synthetic natural rubber Styrene butadiene rubber, abbreviated as SBR, is produced by copolymerization of butadiene and styrene. According to the production method, it can be divided into lotion polymerized styrene butadiene rubber and solution polymerized styrene butadiene rubber. Its comprehensive performance and chemical stability are good. ④ Cis-1,4-polybutadiene rubber, also known as BR, is produced by polymerization of butadiene. Compared with other general-purpose rubbers, vulcanized butadiene rubber has excellent cold resistance, wear resistance, and elasticity. It generates less heat under dynamic loads and has good aging resistance. It is easy to mix with natural rubber, chloroprene rubber, nitrile rubber, etc Chloroprene rubber, abbreviated as CR, is produced by polymerization of chloroprene. Has good comprehensive performance, oil resistance, flame resistance, oxidation resistance, and ozone resistance. But it has a high density, is prone to crystallization and hardening at room temperature, poor storage performance, and poor cold resistance.
The Source and Application Characteristics of Special Rubber
Special rubber refers to rubber with certain special properties. There are mainly: ① Nitrile rubber, abbreviated as NBR, obtained by copolymerization of butadiene and acrylonitrile. Good oil and aging resistance, can be used for a long time in air at 120 ℃ or in oil at 150 ℃. In addition, it also has water resistance, airtightness, and excellent bonding performance Silicone rubber, the main chain is composed of alternating silicon and oxygen atoms, with organic groups on the silicon atoms. High and low temperature resistance, ozone resistance, and good electrical insulation Fluorine rubber, a synthetic rubber with fluorine atoms in its molecular structure. Usually expressed by the number of fluorine atoms in the fluorine containing unit of the copolymer, such as fluorine rubber 23, which is a copolymer of vinylidene fluoride and trifluoroethylene chloride. Fluorine rubber is resistant to high temperature, oil, and chemical corrosion Polysulfide rubber is formed by condensation of dihalogenated alkanes with polysulfides of alkali or alkali earth metals. It has excellent oil and solvent resistance, but its strength is not high, its aging resistance and processability are not good, and it has a foul odor. It is often used in combination with nitrile rubber. In addition, there are also polyurethane rubber, chlorohydrin rubber, acrylic ester rubber, etc.