The use of rubber has a good overall performance and is widely used. There are: 1 natural rubber. Made from the latex of Hevea brasiliensis, the basic chemical composition is cis-polyisoprene. Good elasticity, high strength, good overall performance.
2 isoprene rubber. The full name is cis-1,4-polyisoprene rubber, a high-cis synthetic rubber made from isoprene, and the special rubber material is also called synthetic natural rubber because its structure and properties are similar to natural rubber.
3 styrene butadiene rubber. Referred to as SBR, it is obtained by copolymerizing butadiene and styrene. According to the production method is divided into emulsion polymerization styrene butadiene rubber and solution polymerization styrene butadiene rubber. Its comprehensive performance and chemical stability. 4 butadiene rubber. The full name is cis-1,4-polybutadiene rubber, abbreviated as BR, and is obtained by polymerization of butadiene. Compared with other general-purpose rubbers, vulcanized butadiene rubber is particularly excellent in cold resistance, abrasion resistance, and elasticity. It has less heat under dynamic load, and has good aging resistance. It is easy to use with natural rubber, neoprene, nitrile rubber, etc. .
Special rubber refers to rubber with certain special properties. There are:
1 neoprene. The abbreviation CR is obtained by polymerization of chloroprene. Has a good overall performance, oil resistance, flame resistance, oxidation resistance and ozone resistance. However, its density is relatively high, it is easy to crystallize and harden at room temperature, it is not good in storage, and it is poor in cold resistance.
Rubber products
2 nitrile rubber. Referred to as NBR, it is obtained by copolymerizing butadiene and acrylonitrile. Oil resistance, aging resistance, special rubber materials can be used in air at 120°C or in oil at 150°C for a long time. In addition, it also has water resistance, airtightness and excellent adhesive properties. 3 silicone 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, electricity
4 fluorine rubber. Synthetic rubber containing fluorine atoms in its molecular structure. It is usually expressed as the number of fluorine atoms in the fluorine-containing unit in the copolymer, such as fluororubber 23, and the special rubber material is a copolymer of vinylidene fluoride and chlorotrifluoroethylene. Fluorine rubber is resistant to heat, oil, and chemicals. Good insulation.
5 polysulfide rubber. It is made from polycondensation of polyhalides of dihalogenated alkanes with alkali metals or alkaline earth metals. Has excellent oil and solvent resistance, but the strength is not high, aging resistance, poor processing, odor, and more with nitrile rubber. In addition, there are polyurethane rubber, chlorine alcohol rubber, acrylic rubber and so on.