butadiene rubber was the first industrial synthetic rubber. In 1933, Germany I.G.. Farben first developed emulsion polymerized styrene butadiene rubber (called acetylene synthesis), and began industrial production in 1937. The United States produced butadiene rubber, called GR-S in 1942. Russia also began the production of styrene-butadiene rubber in 1949. The above are copolymers at high temperature (50℃), called high temperature butadiene rubber.

At present, the production of styrene-butadiene rubber (including latex) accounts for about 55% of the total synthetic rubber production, and about 34% of the total natural rubber and synthetic rubber production. Among synthetic rubber, butadiene rubber is still the largest production and consumption.

Low temperature PEstyrene has the following structural characteristics:

1. Due to the irregular molecular structure, it can not be crystallized under tensile and freezing conditions, which is non-crystalline rubber.
2. Like natural rubber, it is also an unsaturated carbon chain rubber. However, compared with natural rubber, the number of double bonds is small, and there is no methyl side group and base push electron action, and the activity of the double bonds is also low.
3. The molecular main bond attracts the large phenyl side group, and the ethylene side group formed by the butadiene-1,2 structure exists, so the steric resistance is large, and the flexibility of the molecular chain is relatively tight.
4. The average relative molecular mass is low, and the relative molecular mass distribution is narrow.

Physical and mechanical properties of low-temperature styrene-butadiene rubber:

1. Because it is unsaturated rubber, it can be sulfide and has good performance with natural general rubber. However, because the degree of unsaturation is lower than that of natural rubber, so the vulcanization speed is slow, and the processing safety is improved, which is not easy to burn, not easy to pass sulfur, and good vulcanization is flat.
2. Due to the tight molecular structure, especially the introduction of large phenyl side base, increase the intermolecular force, so the sulfide glue than natural rubber has better wear resistance, permeability resistance, but also lead to elasticity, cold resistance, tear resistance (especially heat resistance), multiple deformation under heat generation, lag loss, poor radial crack resistance (refers to the radial crack after fast growth rate).
3. Because the carbon chain glue and substituent base belong to the category of non-polar base, so it is the Philippine polar rubber, with poor oil resistance and non-polar solvent resistance. However, due to the tight structure, so the oil resistance and non-polar solvent resistance, chemical corrosion resistance / water resistance are better than natural rubber. Because it contains less impurities, so the electric insulation is also slightly better than natural rubber.
4. Due to the non-crystalline rubber, there is no self-reinforcing strength. The tensile strength of pure rubber sulfide adhesive is very low, with only 2~5MPa. It must be reinforced by high active tonic agent. The tensile strength of carbon black reinforcing sulfide adhesive can reach 25~28MPa.
5. Because the relative molecular mass is controlled in the low range, the initial gate viscosity value of most low-temperature emulsion polystyrene styrene rubber is low, about 50~60, so it is directly mixed without plastic refining. However, due to the poor molecular chain flexibility, the narrow relative molecular mass distribution, and the lack of plasticity, the processing performance of low molecular grade is poor. During mixing, the wetting capacity of the mixture is poor, and the temperature increases, with high equipment load; difficult pressure out operation, large shrinkage or expansion rate of semi-finished products; self-viscosity difference when forming and fitting, etc.

Rubber (S-SBR) is the product of anion copolymerization in organic solvent with butadiene and styrene as monomer and alkyl lithium as catalyst. Due to the different polymerization conditions, styrene and butadiene can be different binding mode, divided into irregular and embedded coexistence type three categories. Regular type is universal soluble styrene rubber, can be used in tires, footwear and industrial rubber products; block type and irregular type are thermoplastic elastomers; irregular type and block coexistence type is new soluble styrene rubber, high vinyl content, which is characterized by low rolling resistance, and small slippery resistance. In addition, there are hair, oil filling, carbon filling black soluble polybutadiene rubber, and trans-1-4-styrene butadienzene rubber and tin coupled soluble polybutadiene rubber and other special varieties.

Compared with low-temperature emulsion styrene butadiene rubber, its rubber has high hydrocarbon content, less branching chain and narrow relative molecular mass distribution, and increases the proportion of cis-1,4 structure, 1,2 structure, and decreases the proportion of trans-1,4 structure. Therefore, this kind of unconventional soluble polystyrene butadiene rubber, suitable for filling a large number of carbon black, sulfide rubber wear resistance, elasticity, cold resistance, permanent deformation are between low temperature emulsion styrene butadiene rubber, so it is suitable for tire production.

Bubutadiene rubber is an old product of synthetic rubber, complete varieties, wide applications, processing technology is relatively mature. Most bubutadiene rubber is used in the tire industry. Other products are auto parts, industrial products, wire and cable leather, hose, tape and footwear.