The Source and Application Characteristics of Special Rubber

Special type 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, suitable for long-term use in air at 120 ℃ or oil at 150 ℃. In addition, it also has water resistance, air tightness, 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 Fluoroelastomer, synthetic rubber with fluorine atoms in its molecular structure. Usually represented by the number of fluorine atoms in the fluorine containing unit of the copolymer, such as fluororubber 23, which is a copolymer of vinylidene fluoride and trifluoroethylene chloride. Fluorine rubber is resistant to high temperature, oil, and chemical corrosion. ④ Polysulfide rubber is formed by condensation of dihaloalkanes with polysulfides of alkali or alkaline 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 polyurethane rubber, chlorohydrin rubber, acrylic rubber, etc.