2. Styrene-butadiene rubber (SBR) copolymer of butadiene and styrene. Its performance is close to that of natural rubber, and it is the general synthetic rubber with the largest output at present. Its characteristics are wear resistance, aging resistance and heat resistance, and its texture is more uniform than that of natural rubber. Disadvantages are: low elasticity, poor buckling resistance and tear resistance; Poor processability, especially poor self-adhesion, and low strength of raw rubber. Working temperature range: about -50℃ ~+ 100℃. Mainly used to replace natural rubber to make tires, rubber sheets, rubber hoses, rubber shoes and other general products.
3. Butadiene rubber (BR) is a cis-structure rubber polymerized from butadiene. Advantages: excellent elasticity and wear resistance, good aging resistance, excellent low temperature resistance, low calorific value under dynamic load and easy metal bonding. Disadvantages are low strength, poor tear resistance, poor machinability and self-adhesion. Service temperature range: about -60℃ ~+ 100℃. Generally used with natural rubber or styrene-butadiene rubber, it is mainly used to make tire treads, conveyor belts and special cold-resistant products.
4. Isoprene rubber (IR) is a cis-structure rubber polymerized from isoprene monomer. The chemical composition, three-dimensional structure and properties are similar to those of natural rubber, so it is called synthetic natural rubber. It has most advantages of natural rubber. Because of natural rubber, its elasticity and strength are slightly lower, its processability is poor and its cost is higher. Service temperature range: about -50℃ ~+ 100℃ can replace natural rubber to make general products such as tires, rubber overshoes, rubber hoses and adhesive tapes.
5. Chloroprene rubber (CR) is a polymer made by emulsion polymerization with chloroprene as monomer. This kind of rubber contains chlorine atoms in its molecules, so compared with other ordinary rubbers, it has the advantages of excellent oxidation resistance, ozone resistance, incombustibility, self-extinguishing in case of fire, oil resistance, solvent resistance, acid and alkali resistance, aging resistance and good air tightness. Its physical and mechanical properties are also better than natural rubber, so it can be used as general rubber and special rubber. The main disadvantages are poor cold resistance, heavy specific gravity, high relative cost, poor electrical insulation, and easy to roll, scorch and stick to the mold during processing. In addition, raw rubber has poor stability and is not easy to store. Working temperature range: about -45℃ ~+ 100℃. Mainly used for manufacturing cable sheaths, various protective sleeves and protective sleeves that require ozone resistance and high aging resistance; Oil-resistant and chemical-resistant rubber hose, adhesive tape and chemical lining; Refractory rubber products for underground mining, as well as various molded products, sealing rings, gaskets, adhesives, etc.
6. Butyl rubber (IIR) is a copolymer of isobutylene and a small amount of isoprene or butadiene. The biggest feature is good air tightness, ozone resistance, aging resistance and high heat resistance, and the long-term working temperature can be below 130℃; Resistant to inorganic strong acids (such as sulfuric acid and nitric acid). ) and common organic solvents, which have good vibration absorption and damping characteristics and excellent electrical insulation. Disadvantages are poor elasticity, poor processability, slow vulcanization speed, poor adhesion and poor oil resistance. Service temperature range: about -40℃ ~+ 120℃. Mainly used as inner tube, water tyre, balloon, wire and cable insulation layer, chemical equipment lining and shock-proof products, heat-resistant conveyor belt and heat-resistant aging adhesive tape products.
7. Ding Qing Rubber (NBR) copolymer of butadiene and acrylonitrile. It is characterized by excellent gasoline and aliphatic hydrocarbon oil resistance, second only to polysulfide rubber, acrylate and fluororubber, and superior to other general rubber. Good heat resistance, air tightness, wear resistance, water resistance and strong adhesion. Disadvantages are poor cold resistance and ozone resistance, low strength and elasticity, poor acid resistance, poor electrical insulation and poor polar solvent resistance. Working temperature range: about -30℃ ~+ 100℃. It is mainly used to manufacture various oil-resistant products, such as rubber pipes and sealing products.
8, hydrogenated Ding Qing rubber (HNBR) butadiene and acrylonitrile copolymer. It is obtained by completely or partially hydrogenating the double bonds in butadiene of nitrile rubber. It is characterized by high mechanical strength and wear resistance. When crosslinked with peroxide, its heat resistance is better than that of NBR, and other properties are the same as those of Ding Qing rubber. The disadvantage is that the price is higher. Working temperature range: about -30℃ ~+ 150℃. Mainly used for oil-resistant and high-temperature resistant sealing products.
9. Ethylene-propylene rubber (EPM \ \ \ EPDM) Copolymers of ethylene and propylene are generally divided into EPDM and EPDM. It is characterized by excellent ozone resistance, ultraviolet resistance, weather resistance and aging resistance, ranking first among general rubber. Good electrical insulation, chemical resistance, impact elasticity, acid and alkali resistance, small specific gravity and high filling. Heat resistance can reach 150℃, polar solvents-ketones, esters, etc. , but not resistant to aliphatic hydrocarbons and aromatic hydrocarbons. Other physical and mechanical properties are slightly inferior to natural rubber and superior to styrene-butadiene rubber. The disadvantage is that self-adhesion and mutual adhesion are poor, and it is not easy to bond. Working temperature range: about -50℃ ~+ 150℃. Mainly used as chemical equipment lining, wire and cable sheath, steam hose, heat-resistant conveyor belt, rubber products for automobiles and other industrial products.