Types of rubber

According to the shape of raw rubber, latex, liquid rubber and powder rubber. Latex is a colloidal water dispersion of rubber; Liquid rubber is the oligomer of rubber, before vulcanization is generally viscous liquid; Powder rubber is latex processed into powder, for the sake of ingredients and processing. Thermoplastic rubber, developed in the 1960s, requires no chemical vulcanization and is formed by a thermoplastic process. According to the use of rubber is divided into general type and special type of two categories. It's an insulator. It's not easy to conduct electricity, but it can become a conductor if it gets wet or at different temperatures. Conduction is about the ease with which electrons in molecules or ions in a substance can conduct. According to the source of raw materials and methods: rubber can be divided into natural rubber and synthetic rubber two categories. The consumption of natural rubber accounts for 1/3, the consumption of synthetic rubber accounts for 2/3.

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

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

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

By performance and use: general rubber and special rubber.

Natural rubber

Natural rubber mainly comes from the three-leaf rubber tree, when the rubber tree skin is cut open, will flow out of the milky juice, called latex, latex by condensation, washing, molding, drying natural rubber.

Synthetic rubber is made by synthetic methods. Different kinds of rubber can be synthesized from different materials (monomers). In 1900-1910, chemist C.D. Harris determined that natural rubber was a polymer of isoprene, opening the way for synthetic rubber. In 1910, Russian chemist SV Lebedev (Lebedev, 1874-1934) polymerized 1, 3-butadiene into sodium butadiene rubber by using sodium metal as the initiator. The yield of synthetic rubber has greatly surpassed that of natural rubber, among which styrene butadiene rubber is the largest.

General rubber

It refers to the rubber used in part or in whole instead of natural rubber, such as styrene-butadiene rubber, styrene-butadiene rubber, isoprene rubber, mainly used in the manufacture of tires and general industrial rubber products. The demand of general rubber is large, it is the main kind of synthetic rubber.

Styrene butadiene rubber

Styrene-butadiene rubber is produced by copolymerization of butadiene and styrene. It is the most widely used synthetic rubber, including latex styrene-butadiene rubber, soluble styrene-butadiene rubber and thermoplastic rubber (SBR).

Nitrile rubber

Nitrile rubber is composed of butadiene and acrylonitrile by emulsion copolymerization of polymers, nitrile rubber, with its excellent oil resistance and yarrow, according to the oil resistance after polysulfide rubber, acrylate rubber and fluorine rubber, nitrile rubber also has good abrasion resistance, aging resistance and gas tightness, ozone resistance, electrical insulation and cold resistance is poor, and electrical conductivity is better. Therefore, it is widely used in rubber industry. Nitrile butadiene rubber is mainly used in oil resistant products, such as various sealing products. Other as PVC modifier and PVC and used as flame retardant products, and phenolic and used as structural adhesives, anti-static good rubber products.

Silicone rubber

Silicone rubber is mainly composed of silicon and oxygen atoms, and the side chain is composed of groups containing carbon. It is both heat-resistant and cold-resistant, with the service temperature between 100-300℃. It has excellent weather resistance and ozone resistance for good insulation. Disadvantages are low strength, poor tear resistance, wear resistance is poor. Silicone rubber is mainly used in aviation industry, electrical industry, food industry and medical industry.

Butadiene rubber

Butadiene is prepared by solution polymerization, butadiene rubber has particularly excellent cold resistance, wear resistance and elasticity, but also has good aging resistance. Butadiene rubber is mostly used in the production of tires, a small part in the manufacture of cold-resistant products, cushioning materials as well as tape, rubber shoes. Butadiene rubber has the disadvantage of poor tear resistance and poor wet - slip resistance.

Isoamyl rubber

Isoprene rubber, short for polyisoprene rubber, is produced by solution polymerization. Isoprene rubber, like natural rubber, has good elasticity, wear resistance, good heat resistance and good chemical stability. The strength of isoprene rubber raw rubber (before processing) is significantly lower than that of natural rubber, but its quality uniformity and processing performance 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 in the production of various rubber products.

Ethylene propylene rubber

Ethylene - propylene rubber is synthesized from ethylene and propylene. Epdm rubber can be filled with oil and carbon black, the product price is lower, epdm rubber chemical stability, wear resistance, elasticity, oil resistance and styrene butadiene rubber close. Ethylene propylene rubber is widely used, can be used as tire side, rubber strip and inner tube as well as automobile parts, can also be used as wire, cable cover and high voltage, ultra high voltage insulation materials. Also can manufacture rubber shoes, sanitary products and other light - colored products.

Neoprene

It is made from chlorobutadiene by homopolymerization or a small amount of other monomers. Such as high tensile strength, heat, light, aging resistance, oil resistance is better than natural rubber, styrene butadiene rubber, butadiene rubber. It has strong fire resistance and excellent fire resistance, high chemical stability and good water resistance. The disadvantages of neoprene are electrical insulation, poor cold resistance, raw rubber in storage instability. Neoprene is used in a wide range of applications, such as for transport belts and transmission belts, as a wrapping material for electric wires and cables, as well as for oil-resistant rubber tubes, gaskets and chemical corrosion resistant equipment linings.