Styrene-butadiene rubber (SBR), which is polymerized from butadiene and styrene, is the most widely used synthetic rubber, including emulsion styrene-butadiene rubber, solution styrene-butadiene rubber and thermoplastic rubber (SBS).
Sisden
It is made of butadiene by solution polymerization, and cis-polybutadiene rubber has excellent cold resistance, wear resistance and elasticity, as well as good aging resistance. Most of cis-polybutadiene rubber is used to produce tires, and a small part is used to make cold-resistant products, cushioning materials, adhesive tapes, rubber shoes and so on. The disadvantages of cis-polybutadiene rubber are poor tear resistance and wet skid resistance.
isoprene rubber
Isoprene rubber is the abbreviation of polyisoprene rubber, which is produced by solution polymerization. Like natural rubber, isoprene rubber has good elasticity and wear resistance, excellent heat resistance and good chemical stability. The strength of raw isoprene rubber (unprocessed) is obviously lower than that of natural rubber, but its quality uniformity and processability are better than that of natural rubber. Isoprene rubber can replace natural rubber to make truck tires and off-road tires, and can also be used to produce various rubber products.
ethylene propylene rubber
Ethylene-propylene rubber is synthesized from ethylene and propylene, which has outstanding aging resistance, electrical insulation and ozone resistance. Ethylene propylene rubber can be filled with a lot of oil and carbon black, and the product price is lower. Ethylene propylene rubber has good chemical stability, and its wear resistance, elasticity and oil resistance are close to those of styrene-butadiene rubber. Ethylene propylene rubber is widely used, which can be used as tire sidewall, rubber strip, inner tube and automobile parts, and can also be used as wire and cable sheath and high voltage and ultra-high voltage insulation material. You can also make light-colored products, such as rubber shoes and sanitary products.
chloroprene rubber
It is made of chloroprene as the main raw material by homopolymerization or polymerization of a small amount of other monomers. For example, it has high tensile strength, excellent heat resistance, light resistance and aging resistance, and oil resistance is better than natural rubber, styrene-butadiene rubber and cis-butadiene rubber. It has strong flame retardancy and excellent flame retardancy, high chemical stability and good water resistance. The disadvantages of chloroprene rubber are poor electrical insulation and cold resistance, and the raw rubber is unstable during storage. Neoprene rubber has a wide range of uses, such as making covering materials for transportation belts and transmission belts, wires and cables, making oil-resistant hoses, gaskets and chemical-resistant equipment linings. nitrile rubber
NBR is made of butadiene and acrylonitrile by emulsion polymerization. Nitrile rubber is mainly produced by low-temperature emulsion polymerization, which has excellent oil resistance, high wear resistance, good heat resistance and strong adhesion. Its disadvantages are poor low temperature resistance, poor ozone resistance, poor electrical performance and slightly lower elasticity. Nitrile rubber is mainly used to make oil-resistant rubber products.
butyl rubber
Butyl rubber is polymerized from isobutylene and a small amount of isoprene, which is mainly produced by slurry method. Low air permeability, excellent air tightness, good heat resistance, ozone resistance, aging resistance, chemical stability and electrical insulation. Butyl rubber has the disadvantages of slow vulcanization speed and poor elasticity, strength and adhesion. Butyl rubber is mainly used to manufacture various vehicle inner tubes, used to manufacture wire and cable sheaths, heat-resistant conveyor belts, steam hoses and so on.
viton
Fluorine rubber is a kind of synthetic rubber containing fluorine atoms, which has excellent heat resistance, oxidation resistance, oil resistance and drug resistance. Mainly used in aviation, chemical industry, petroleum, automobile and other industrial sectors as sealing materials, dielectric resistant materials and insulating materials.
silicon rubber
Silicone rubber is composed of silicon and oxygen atoms, and its side chain is carbon-containing group. The most content of silicone rubber is vinyl. Heat-resistant and cold-resistant, the service temperature is between-100 ~ 300℃. It has excellent weather resistance, ozone resistance and good insulation. Disadvantages are low strength, poor tear resistance and poor wear resistance. Silicone rubber is mainly used in aviation industry, electrical industry, food industry and medical industry.
polyurethane
Polyurethane rubber is polymerized from polyester (or polyether) and diisocyanurate compound. Good wear resistance, followed by good elasticity, high hardness, oil resistance and solvent resistance. The disadvantage is poor thermal aging resistance. Polyurethane rubber is widely used in automobile, shoemaking and machinery industries.
Cars need special synthetic rubber with high performance.
Rubber parts for automobiles play an important role in vibration prevention, noise reduction, driving stability and ride comfort of automobiles. The amount of general rubber materials used in automobiles is relatively large. However, with the development of the engine in the direction of high power and miniaturization in recent years, the ambient temperature around the engine has increased, and the requirements of exhaust control regulations have become more stringent. In addition, the use of alcohol fuel forces rubber parts to improve their properties, such as heat resistance, cold resistance, oil resistance and aging resistance. Therefore, the amount of high-performance special synthetic rubber
Cars have gradually become the main market for these special synthetic rubbers. Therefore, the types of automobile rubber will develop to special rubber with excellent performance.
The improvement of rubber raw materials has improved the service life of rubber parts. At present, the service life of oil seals generally exceeds 250,000 kilometers, and the service life of fan belts reaches 6,543,800 kilometers. According to the research and analysis of Deng Lupu Company in the UK, acrylate rubber is the most promising in the future automobile industry, and the consumption of fluororubber, silicone rubber, EPDM, epichlorohydrin rubber and polyurethane rubber is also increasing.
At present, the automobile parts made of acrylate rubber mainly include engine oil seal, cylinder gasket, oil cooler hose, exhaust hose, gearbox, oil seal and various O-rings. The fluororubber parts used in automobiles include water pump seal, valve stem seal, crankshaft rear oil seal, single valve diaphragm, rubber hose, gas rainbow sleeve O-ring seal, etc. It is expected that all kinds of gaskets except cylinder gasket may eventually be made of silicone rubber.
China's special rubber for automobiles has few varieties and specifications, unstable quality and poor technological performance, which can't meet the demand of rubber for automobiles. In particular, there is a shortage of rubber raw materials needed for the localization of imported rubber products. We only need to import seven kinds of rubber, including acrylate rubber, EPDM rubber, hydrogenated butyl rubber, oil-resistant silicone rubber, butyl rubber, thermoplastic rubber and fluororubber.