1, NR refers to the natural rubber. Natural rubber (NR) is a cis-1,4-polyisoprene as the main component of natural polymer compounds, 91% to 94% of its composition is a rubber hydrocarbon (cis-1,4-polyisoprene), and the rest are proteins, fatty acids, ash, sugar and other non-rubber substances. Natural rubber is the most widely used general-purpose rubber.
2, IR is isoprene rubber. Isoprene rubber a high-performance rubber for tire production, with its stable chemical properties are widely used in the tire manufacturing industry. It has good elasticity, cold resistance (glass temperature -68 ℃) and high tensile strength. In the oxidation resistance and multiple deformation conditions of resistance to cut and tear than natural rubber, but processing performance such as mixing, calendering, etc. than natural rubber is slightly worse.
3, SBR refers to the styrene butadiene rubber. Also known as polystyrene butadiene **** polymer. Its physical properties, processing performance and product performance close to natural rubber, some properties such as abrasion resistance, heat resistance, aging resistance and vulcanization speed is more excellent than natural rubber, natural rubber and a variety of synthetic rubber and widely used in tires, adhesive tapes, rubber hoses, wires and cables, medical devices and a variety of rubber products in the field of production, it is the largest general-purpose varieties of synthetic rubber, but also one of the earliest realization of industrial production of rubber varieties. It is the largest general-purpose synthetic rubber, and one of the earliest rubber varieties to realize industrialized production.
4, BR refers to the cis-butadiene rubber. Cis-1,4-polybutadiene rubber is cis-1,4-polybutadiene rubber, its molecular formula is (C4H6)n. Cis-butadiene rubber is the butadiene polymerization of the structure of the regular synthetic rubber, the cis structure of the content of more than 95%. According to the different catalysts, it can be divided into nickel system, cobalt system, titanium system and rare earth system (neodymium system) of cis-butadiene rubber. The cis-butadiene rubber is the second largest synthetic rubber after styrene butadiene rubber.
5, NBR refers to the nitrile rubber. NBR is made of butadiene and acrylonitrile by emulsion polymerization, nitrile rubber is mainly produced by low-temperature emulsion polymerization, excellent oil resistance, high abrasion resistance, good heat resistance, strong adhesive force. Its disadvantages are poor low-temperature resistance, poor ozone resistance, poor insulation properties, slightly lower elasticity. Nitrile rubber is mainly used in the manufacture of oil-resistant rubber products. Abbreviated as NBR, it is a kind of synthetic rubber made by polymerizing butadiene and acrylonitrile***. It is a synthetic rubber with good oil resistance (especially alkane oil) and aging resistance.
6, EPDM refers to the EPDM rubber. EPDM is ethylene, propylene and a small amount of non-*** yoke diolefin **** polymer, is a kind of ethylene propylene rubber, expressed as EPDM (Ethylene Propylene Diene Monomer), because its main chain is composed of chemically stable saturated hydrocarbons, only in the side chain contains an unsaturated double bond, so it is ozone-resistant, heat-resistant, weather-resistant and other aging properties, can be It can be widely used in automobile parts, waterproof materials for construction, wire and cable sheathing, heat-resistant hoses, adhesive tapes, automobile seals and other fields.
Reference:
Baidu Encyclopedia-Natural RubberBaidu Encyclopedia-Isoprene Rubber
Baidu Encyclopedia-Styrene Butadiene Rubber
Baidu Encyclopedia-Shuntung Rubber Baidu Encyclopedia-Nitrile RubberBaidu Encyclopedia-Ethylene Propylene Rubber
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