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Rubber classification
- Jan 03, 2019 -

Rubber classification


According to the form, it is divided into block rubber, latex, liquid rubber and powder rubber. milk

The glue is a colloidal aqueous dispersion of rubber; the liquid rubber is a rubber oligomer, which is generally a viscous liquid before being vulcanized; the powder rubber is processed into a powder to facilitate the preparation and processing. The thermoplastic rubber developed in the 1960s was formed by a thermoplastic processing method without chemical vulcanization. Rubber is divided into general and special types according to its use. It is an insulator and is not easy to conduct electricity, but it may become a conductor if it is wet or at a different temperature. Conductivity is an easy condition for the conduction of electrons with molecules or ions inside a substance. According to the source and method of raw materials: rubber can be divided into two categories: natural rubber and synthetic rubber. Natural rubber consumption accounts for 1/3, and synthetic rubber consumption accounts for 2/3.


According to the appearance of rubber: rubber can be divided into four categories: solid rubber (also known as dry rubber), milk rubber (referred to as latex), liquid rubber and powder rubber.


According to the properties and uses of rubber: in addition to natural rubber, synthetic rubber can be divided into general synthetic rubber, semi-generic synthetic rubber, special synthetic rubber and special synthetic rubber.


According to the physical form of rubber: rubber can be divided into hard rubber and soft rubber, raw rubber and rubber compound.


According to performance and use: general rubber and special rubber.


natural rubber


Natural rubber is mainly derived from the trefoil tree. When the skin of the rubber tree is cut, the milky white juice is called, which is called latex. The latex is coagulated, washed, formed and dried to obtain natural rubber. Synthetic rubber is produced by artificial synthesis, and different types of rubber can be synthesized using different raw materials (monomers). From 1900 to 1910, chemist C.D. Harris determined that the structure of natural rubber is a polymer of isoprene, which opens the way for synthetic rubber. In 1910, the Russian chemist SV Lebedev (1874-1934) used sodium metal as an initiator to polymerize 1,3-butadiene into butadiene rubber. Later, many new synthetic rubber varieties appeared, such as Butadiene rubber, neoprene, styrene butadiene rubber, etc. The output of synthetic rubber has greatly exceeded that of natural rubber, and the largest output is styrene-butadiene rubber.


General purpose rubber


It refers to some or all of the rubber used in place of natural rubber, such as styrene butadiene rubber, butadiene rubber, isoprene rubber, etc., mainly used in the manufacture of tires and general industrial rubber products. General rubber is in high demand and is the main type of synthetic rubber.


SBR


Styrene-butadiene rubber is a copolymer of butadiene and styrene. It is the most widely produced general-purpose synthetic rubber, including latex polystyrene-butadiene rubber, solution-polymerized styrene-butadiene rubber and thermoplastic rubber (SBR).


Nitrile rubber


Nitrile rubber is a polymer obtained by emulsion copolymerization of butadiene and acrylonitrile. Nitrile rubber is nicknamed for its excellent oil resistance, and its oil resistance is second only to polysulfide rubber, acrylate rubber and fluororubber. In addition, nitrile rubber has good wear resistance, aging resistance and air tightness, but ozone resistance, electrical insulation and cold resistance are relatively poor, and electrical conductivity is better. Therefore, it is widely used in the rubber industry. The use of nitrile rubber is mainly used in oil resistant products such as various sealing products. Others are used as a PVC modifier and as a flame retardant product with PVC, as a structural adhesive with phenolic, and as an antistatic good rubber product.


Silicone Rubber


The silicone rubber is composed of silicon and oxygen atoms, and the side chain is a carbon-containing group. The maximum amount is a silicone rubber having a side chain of ethylene. It is heat-resistant and cold-resistant. It is used at temperatures between 100 and 300 ° C. It has excellent weather resistance and ozone resistance for good insulation. Disadvantages are low strength, poor tear resistance and poor wear resistance. Silicone rubber is mainly used in the aviation industry, electrical industry, food industry and medical industry.


Butadiene rubber


It is prepared by solution polymerization of butadiene. Butadiene rubber has excellent cold resistance, wear resistance and elasticity.

Rubber tires

Rubber tires

Sex, also has good aging resistance. Most of the butadiene rubber is used to produce tires, and a small part is used to make cold-resistant products, cushioning materials, and tapes and rubber shoes. The disadvantage of butadiene rubber is that it has poor tear resistance and poor wet skid resistance.


Isoprene rubber


Isoprene rubber is an abbreviation for polyisoprene rubber and 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 the isoprene rubber (unprocessed) is significantly lower than that of natural rubber, but the quality uniformity and processing properties are superior to those of natural rubber. Isoprene rubber can be used to make heavy duty tires and off-road tires instead of natural rubber. It can also be used to produce a variety of rubber products.


Ethylene propylene rubber


Ethylene-propylene rubber is synthesized from ethylene and propylene as main raw materials, and has outstanding resistance to aging, electrical insulation and ozone resistance. Ethylene-propylene rubber can be filled with a large amount of oil and filled with carbon black. The price of the product is low. The chemical stability of ethylene-propylene rubber is good, and the wear resistance, elasticity, oil resistance and styrene-butadiene rubber are close. Ethylene-propylene rubber is widely used as a tire sidewall, rubber strip and inner tube, as well as automotive parts. It can also be used for wire and cable sheathing and high-voltage, ultra-high-voltage insulation materials. It can also manufacture light-colored products such as rubber shoes and sanitary products.


Neoprene


It is made of chloroprene as the main raw material by homopolymerization or copolymerization of a small amount of other monomers. Such as high tensile strength, heat resistance, light resistance, aging resistance, oil resistance is better than natural rubber, styrene butadiene rubber, butadiene rubber. It has strong flame resistance and excellent resistance to flame retardancy. It has high chemical stability and good water resistance. The disadvantage of neoprene is that it has electrical insulation properties and poor cold resistance, and the raw rubber is unstable during storage. Neoprene is used in a wide variety of applications, such as the manufacture of conveyor belts and drive belts, sheathing materials for wires and cables, and the manufacture of oil-resistant hoses, gaskets and chemically resistant equipment linings.