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Rubber. Silicone

Update Time:2011-05-27   Writer:arima

Rubber is rubber industry's basic raw material, widely used in the manufacture of tires, hose, belt, cable and other rubber products. Classification of rubber:
1 divided by raw natural rubber and synthetic rubber.
2 is divided into blocks according to shape raw rubber, latex, rubber, liquid rubber and powder.
Colloidal latex of rubber-like aqueous dispersion;
Liquid rubber for the rubber oligomers, before curing is generally not viscous liquid;
Powdered latex rubber is processed into powder form to facilitate the production of ingredients and processing.
3-per-use is divided into general-purpose and special type.
Universal good combined properties of rubber, widely used. Are: ① natural rubber. ② isoprene rubber, also known as synthetic natural rubber. ③ styrene-butadiene rubber, referred to as the SBR. ④ butadiene rubber, referred to as BR.
Special type rubber that has some special properties of the rubber. Are:
① chloroprene rubber, referred to as CR.
Obtained by the polymerization of chloroprene. Has a good overall performance, oil, fire, resist oxidation and ozone. But its high density, easy to crystallize at room temperature hardening, storage is bad, bad cold.
② nitrile rubber, referred to as NBR.
By the copolymerization of butadiene and acrylonitrile obtained. Good oil resistance, heat resistance, cold, pressure and water resistance, air tightness and excellent bonding properties, and have suitable wear resistance, the usual temperature is approximately -40 ℃ ~ +120 ℃ can be at 120 ℃ 150 ℃ in air or oil in the long-term use.
Easily molded into any shape with a metal hydraulic seals, NBR therefore most suitable for working pressure of not more than 32Mpa production of hydraulic cylinder seals. The specially designed formula, oil-resistant and easy by onset: can withstand the mechanical abrasion car axis speed 3000 r / when the following (in this case rubber hardness of 70 °).
③ silicone rubber. SILICONE
Main chain composed of alternating silicon and oxygen atoms in the silicon atoms with organic groups. High temperature resistance, ozone resistance, electrical insulation. ﹋ temperature -40 ℃ 220 ℃; oil is preferred, temperature, abrasion resistance, oil! Especially suitable for automotive engine crankshaft oil seal is not temperature volatile oil (diesel, gasoline) wear, the on oxygen, ozone, and sunlight (UV) resistant.
④ fluorine rubber. Viton
Sub-structure of synthetic rubber containing fluorine atoms. Usually fluorinated copolymer unit, said the number of fluorine atoms, such as fluorine rubber, 23, is a vinylidene fluoride copolymers with chlorotrifluoroethylene. Viton high temperature, oil resistance, chemical corrosion. Oil, high temperature, chemical resistance, but also has the characteristics of acid and alkali. Operating temperature -30 ℃ 280 ℃. Jet engine for the crankshaft oil seal, oil seal when the regulations, is also used of the agents and the ring O-ring