The chemical composition, performance characteristics and main uses of common rubber products

1. Natural rubber (NR)


It is mainly rubber hydrocarbon (polyisoprene), containing a small amount of protein, water, resin acid, sugar and inorganic salt. Large elasticity, high tensile strength, excellent tear resistance and electrical insulation, good wear resistance and drought resistance, good processability, easy to bond with other materials, and better than most synthetic rubbers in terms of comprehensive performance. The disadvantages are poor resistance to oxygen and ozone, easy to aging and deterioration; poor resistance to oil and solvents, low corrosion resistance to acids and alkalis, and low heat resistance. Operating temperature range: about -60~+80. Production of tires, rubber shoes, hoses, tapes, insulating layers and sheaths of wires and cables, and other general products. It is especially suitable for the manufacture of torsional vibration eliminators, engine shock absorbers, machine supports, rubber-metal suspension components, diaphragms, and molded products.


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2. Styrene butadiene rubber (SBR)


Copolymer of butadiene and styrene. The performance is close to that of natural rubber. It is a general-purpose synthetic rubber with a large output at present. It is characterized by abrasion resistance, aging resistance and heat resistance exceeding natural rubber, and its texture is more uniform than natural rubber. The disadvantages are: low elasticity, poor flex resistance and tear resistance; poor processing performance, especially poor self-adhesiveness and low green rubber strength. Operating temperature range: about -50~100. It is mainly used to replace natural rubber to make tires, rubber sheets, hoses, rubber shoes and other general products.


3. Butadiene rubber (BR)


It is a cis-structure rubber formed by polymerization of butadiene. The advantages are: excellent elasticity and wear resistance, good aging resistance, excellent low temperature resistance, low heat generation under dynamic load, and easy metal bonding. The disadvantages are low strength, poor tear resistance, poor processing performance and self-adhesiveness. Operating temperature range: about -60~100. Generally, it is used together with natural rubber or styrene-butadiene rubber, mainly to make tire treads, conveyor belts and special cold-resistant products.


4. Isoprene rubber (IR)


It is a kind of cis-structure rubber made by polymerization of isoprene monomer. The chemical composition and three-dimensional structure are similar to natural rubber, and the performance is very close to natural rubber, so it is called synthetic natural rubber. It has most of the advantages of natural rubber. Due to its aging resistance, natural rubber has slightly lower elasticity and strength than natural rubber, poor processing performance and higher cost. Operating temperature range: about -50~+100It can replace natural rubber to make tires, rubber shoes, hoses, tapes and other general products.


5. Neoprene (CR)


It is a polymer formed by emulsion polymerization of chloroprene as monomer. This kind of rubber contains chlorine atoms in its molecule, so compared with other general rubbers: it has excellent antioxidant, ozone resistance, non-flammable, self-extinguishing after fire, oil resistance, solvent resistance, acid and alkali resistance, aging and gas resistance. Good tightness and other advantages; its physical and mechanical properties are also better than natural rubber, so it can be used as general-purpose rubber or special rubber. The main disadvantages are poor cold resistance, large specific gravity, high relative cost, poor electrical insulation, and easy sticking, scorching, and mold sticking during processing. In addition, the raw rubber has poor stability and is not easy to store. Operating temperature range: about -45~100. Mainly used to manufacture cable sheaths and various protective covers and protective covers that require high ozone resistance and high aging resistance; oil and chemical resistance hoses, tapes and chemical linings; flame-resistant rubber products for underground mining, and various moldings Products, sealing rings, gaskets, adhesives, etc.

Post time: Mar-26-2021

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