Natural rubber is mainly rubber hydrocarbon, containing a small amount of protein, water, resin acid, sugar and inorganic salt. High elasticity, high tensile strength, excellent tear resistance and electrical insulation, good wear resistance and drought resistance, good workability, easy to bond with other materials, superior to most synthetic rubber in terms of comprehensive properties. The disadvantage is poor oxygen resistance and ozone resistance, easy to aging deterioration; Oil and solvent resistance is not good, acid and alkali corrosion resistance is low; The heat resistance is not high. Operating temperature range: about -60℃ ~ +80℃. Manufacture tires, rubber shoes, rubber hose, tape, wire and cable insulation and jacket and other general products. Especially suitable for the manufacture of torsional vibration eliminator, engine shock absorber, machine support, rubber-metal suspension elements, diaphragm, molded products.
A copolymer of styrene butadiene and styrene. The performance is close to natural rubber, is the current production of general synthetic rubber, which is characterized by wear resistance, aging resistance and heat resistance than natural rubber, the texture is also more uniform than natural rubber. The disadvantage is that the elasticity is low, the resistance to flexure and tear is poor; Poor processing performance, especially poor self-viscosity, low rubber strength. Operating temperature range: about -50℃ ~ +100℃. It is mainly used to replace natural rubber to make tires, rubber plates, rubber hoses, rubber shoes and other general products.
Butadiene rubber is a cis-structured rubber synthesized from butadiene. Excellent elasticity and wear resistance, good aging resistance, excellent low temperature resistance, low heat under dynamic load, easy to metal bonding. The disadvantages are low strength, poor tear resistance, poor processing performance and self-viscosity. Operating temperature range: about -60℃ ~ +100℃. Generally, it is used with natural rubber or styrene butadiene rubber, mainly making tire tread, transport belt and special cold-resistant products.
Isoprene rubber is a cis-structured rubber synthesized from isoprene monomer. The chemical composition and three-dimensional structure are similar to natural rubber, and the performance is also very close to natural rubber, so it is called synthetic natural rubber. It has most of the advantages of natural rubber, aging resistance due to natural rubber, the elasticity and strength are slightly lower than natural rubber, poor processing performance, high cost. Use temperature range: about -50℃ ~ +100 ℃ can replace natural rubber to make tires, rubber shoes, hose, tape and other general products.
Neoprene rubber is a polymer made from chloroprene as a monomer emulsion polymerization. This rubber molecule contains chlorine atoms, so compared with other general purpose rubber: it has excellent oxygen resistance, ozone resistance, non-flammable, self-extinguishing after fire, oil resistance, solvent resistance, acid and alkali resistance, aging resistance, good air tightness and other advantages; 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, large proportion, high relative cost, poor electrical insulation, easy to stick rolling, easy to burn and easy to stick mold during processing. In addition, raw rubber stability is poor, not easy to save. Operating temperature range: about -45℃ ~ +100℃. It is mainly used in the manufacture of cable sheaths and various protective sleeves and protective covers requiring high ozone resistance and aging resistance; Oil and chemical resistant hose, tape and chemical lining; Inflammable underground mining rubber products, as well as various molded products, sealing rings, pads, binders, etc.
Butyl rubber is a copolymer of isobutylene and a small amount of isoprene or butadiene. It is characterized by good air tightness, good ozone resistance, good aging resistance, high heat resistance, long-term working temperature can be below 130℃; It can withstand strong inorganic acids (such as sulfuric acid, nitric acid, etc.) and general organic solvents, good vibration absorption and damping characteristics, and electrical insulation is also very good. The disadvantages are poor elasticity, poor processing performance, slow curing speed, poor adhesion and oil resistance. Operating temperature range: about -40℃ ~ 120℃. Mainly used as inner tube, wire and cable insulation layer, chemical equipment lining and shock-proof products, heat-resistant transport belt, heat-resistant aging tape products.
Butadiene rubber is prepared by copolymerization of butadiene and acrylonitrile. It has good oil resistance, heat resistance, cold resistance, pressure resistance and water resistance, air tightness and excellent adhesive properties, and has suitable wear resistance, the usual use temperature is roughly -40 ~ +120 ° C, and can be used in 120 ° C air or 15O ° C oil for a long time. It is easy to use metal molding into hydraulic seals of any shape, so Ding Qing rubber is most suitable for making hydraulic cylinder seals with working pressure of no more than 32MPa. Specially designed formula, easy to press hair oil: wear-resistant to withstand the mechanical automobile axis speed of 3000 RPM/h below (at this time the rubber hardness of 70°).
A copolymer of hydrogenated butadiene and acrylonitrile rubber. It is obtained by fully or partially hydrogenating the double bonds in butadiene of NBR. It is characterized by high mechanical strength and wear resistance, better heat resistance than NBR when crosslinked with peroxide, and other properties are the same as butyl rubber. Operating temperature range: about -30℃ ~ +150℃. Mainly used for oil resistance, high temperature sealing products.
Ethylene propylene rubber is a copolymer of ethylene and propylene, generally divided into binary ethylene propylene rubber and EPDM rubber. It is characterized by ozone resistance, ultraviolet resistance, weather resistance and aging resistance, ranking first in general rubber. Electrical insulation, chemical resistance, good impact elasticity, acid and alkali resistance, small specific gravity, can be filled with high. Heat resistance up to 15O℃, resistance to polar solvents one ketone, ester, etc., but not resistant to aliphatic hydrocarbons and aromatic hydrocarbons, other physical and mechanical properties are slightly inferior to natural rubber and better than styrene butadiene rubber. The disadvantage is that the self-viscosity and mutual viscosity are very poor, and it is not easy to bond. Operating temperature range: about -50℃ ~ +150℃. Mainly used as wire and cable cover, steam hose, heat-resistant transport belt, automotive rubber products and other industrial products.
Silicone rubber. The main chain is composed of alternating silico-oxygen atoms with organic groups on the silicon atoms. High and low temperature resistance, ozone resistance, good electrical insulation. Operating temperature -40℃ ~ +220℃; Oil resistance is preferred, temperature resistance, wear resistance, oil resistance. Especially suitable for crankshaft oil seals in automotive engines, resistant to oxygen, ozone and sunlight (ultraviolet).
Fluorine rubber. A synthetic rubber containing fluorine atoms in its substructure. It is usually expressed by the number of fluorine atoms in the fluorine unit in the copolymer, such as fluorine rubber 23, which is a copolymer of vinylidene fluoride and trifluoro vinyl chloride. Fluororubber is resistant to high temperature, oil and chemical corrosion. Oil resistance, high temperature resistance, chemical resistance, and acid and alkali resistance. Operating temperature -30℃ ~ +280℃. Suitable for crankshaft oil seals, time-gauge oil seals, O-rings and seals in jet engines.
Polyaminocool rubber. Polyurethane is a kind of synthetic rubber with the highest tensile strength, compared with rubber, it has excellent oil resistance, heat resistance, cold resistance, pressure resistance and wear resistance and good mechanical properties, the usual use temperature of -40℃ ~ +80℃, polyurethane cool rubber room temperature sealing performance is superior to buqing rubber, It is especially suitable for the production of medium pressure, high pressure and ultra-high pressure hydraulic cylinder seals. Therefore, it is the most commonly used sealing material for medium and high pressure hydraulic cylinders (butadiene glue can be used for low pressure), especially for longer service life, and many occasions where rubber oil seals are used to use polyurethane oil seals.
Acrylic rubber is a polymer of ethyl acrylate or butyl acrylate vinegar. It is characterized by both good heat resistance and oil resistance, and stable performance in lubricants containing sulfur, phosphorus and chlorine additives. At the same time, aging resistance, oxygen and ozone resistance, ultraviolet resistance, good air tightness. The disadvantages are poor cold resistance, water resistance, steam resistance and organic and inorganic acids and alkalis. It expands badly in water-soluble solution such as methanol, ethylene glycol and ketovinegar. At the same time, the elasticity and wear resistance are poor, the electrical insulation is poor, and the processing performance is poor. Operating temperature range: about -25℃ ~ +150℃. Can be used to manufacture oil resistant, heat resistant, aging resistant products, such as seals, hose, chemical lining, etc.
Chloro-sulfonated polyethylene rubber is an elastic polymer obtained by chlorination and sulfonation of polyethylene. Ozone resistance close to aging good, weather resistance is better than other rubber. Flame retardant, heat resistance, solvent resistance and resistance to most chemicals and acid and alkali resistance is good. The electrical insulation is acceptable, and the wear resistance is similar to that of styrene butadiene rubber. The disadvantage is that the tear resistance is poor and the processing performance is not good. Operating temperature range: about -20℃ ~ +120℃. It can be used as a sealing material on ozone generators, to manufacture oil-resistant seals, wire and cable covers, and oil-resistant rubber products and chemical linings.
Polysulfide rubber is formed by polysulfide condensation of dihalides with alkali or alkaline earth metals. It has excellent oil resistance and solvent resistance, but the strength is not high, aging resistance, poor processability, odor, and most of it is used with butadiene rubber. In addition, there are polyurethane rubber, chloryl alcohol rubber, acrylic rubber and so on.
A polymer composed of epichlorohydrin or epichlorohydrin copolymerized with ethylene oxide. It is characterized by resistance to aliphatic hydrocarbon and chlorinated hydrocarbon solvent, alkali resistance, water resistance, aging resistance, ozone resistance. It can be used as hose, seal, film and container lining, oil tank, rubber roller, oil seal, water seal and so on.
Chlorinated polyethylene rubber is an elastic polymer made of polyethylene by chlorine substitution reaction. Its properties are similar to those of chloro-sulfonated polyethylene rubber, which is characterized by good fluidity and easy processing; It has excellent weather resistance, ozone resistance and corona resistance, good heat resistance, acid and alkali resistance and oil resistance. The disadvantages are poor elasticity, large compression deformation, and low electrical insulation. Operating temperature range: about -20℃ ~ +120℃. Wire and cable sheath, hose, tape, rubber roller chemical lining, etc.