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Characteristics of silicone rubber

Release time:

2019-07-05 12:30

Source:

Characteristics of silicone rubber
 
Silicone rubberThe characteristics are different according to various models, so the characteristics are also different.
1. Natural rubber (NR) is mainly rubber hydrocarbon (polyisoprene), containing a small amount of protein, water, resin acid, sugar, natural rubber and inorganic salt. Large elasticity, high tensile strength, tear resistance and excellent electrical insulation, good wear resistance and drought resistance, good processability, easy to bond to other materials, in terms of comprehensive performance is better than most synthetic rubber. The disadvantage is that the oxygen and ozone resistance is poor, easy to aging deterioration;
 
Oil and solvent resistance is not good, the first anti-acid and alkali corrosion ability is low; heat resistance is not high. Use temperature range: about -60 ℃ ~ +80 ℃. Production of tires, rubber shoes, hoses, tapes, wire and cable insulation and sheath and other general products. Especially suitable for the manufacture of torsional vibration eliminators, engine shock absorbers, machine supports, rubber-metal suspension elements, diaphragms, molded products.
 
2. Styrene-butadiene rubber (SBR) copolymer of butadiene and styrene. Performance close to natural rubber, is currently the largest production of general-purpose synthetic rubber, which is characterized by wear resistance, aging resistance and heat resistance than natural rubber, texture is also more uniform than natural rubber. Disadvantages are: low elasticity, flex resistance, tear resistance is poor; poor processing performance, especially poor self-adhesive, low strength of raw rubber. Use 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.
3. Butadiene rubber (BR) is a cis-structured rubber polymerized from butadiene. The advantages are: excellent elasticity and wear resistance, good aging resistance, excellent low temperature resistance, low heat generation under dynamic load, easy metal bonding. The disadvantage is that the strength is low, the tear resistance is poor, the processing performance and the self adhesive difference. Use temperature range: about -60 ℃ ~ +100 ℃. Generally and natural rubber or styrene-butadiene rubber and used, the main production of tire tread, transport belt and special cold-resistant products.
 
4. Isoprene rubber (IR) is a cis-structured rubber polymerized 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, elasticity and strength is slightly lower than natural rubber, processing performance is poor, the cost is higher. Use temperature range: about -50 ℃ ~ +100 ℃ can replace natural rubber tires, rubber shoes, hose, tape and other general products.
 
5. Chloroprene rubber (CR) is a polymer made of chloroprene monomer emulsion polymerization. This rubber molecule contains chlorine atoms, so compared with other general-purpose rubber: it has excellent anti-oxygen, anti-ozone, non-flammable, self-extinguishing after fire, oil resistance, solvent resistance, acid and alkali resistance and 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-purpose rubber, can also be used as special rubber.
 
The main disadvantages are poor cold resistance, large proportion, high relative cost, poor electrical insulation, easy to roll, easy to scorch and easy to stick mold during processing. In addition, the raw rubber has poor stability and is not easy to store. Use temperature range: about -45 ℃ ~ +100 ℃. Mainly used in the manufacture of requirements of anti-ozone, high aging resistance of cable sheath and a variety of protective sheath, protective cover; oil-resistant, chemical-resistant hose, tape and chemical lining; fire-resistant underground mining rubber products, and a variety of molded products, seals, pads, adhesives, etc.

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