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SBS is a styrene thermoplastic elastomers, styrene-butadiene - styrene block copolymer 3 (Styrene Butadiene styrene block polymer) as thermoplastic styrene-butadiene block copolymer styrene-butadiene rubber or thermoplastic, or SBS. Under different synthesis methods. SBS cable type structure and star-shaped configuration, the linear structure of SBS-see figure. SBS of polystyrene (PS) and the chain of polybutadiene (PB) of the chain was obviously two-phase structure, as the continuous phase PB, PS of the dispersed phase. Mutually exclusive, was separated from the state. Polystyrene spherical region gathered starting point and crosslinking reinforcement particles role. Linear SBS mean molecular weight (8 - l2) 10000, star SBS mean molecular weight 14-30 million. SBS molecular to have great impact properties, molecular weight, viscosity, high strength adhesive. SBS products than the monomer composition is very important, with styrene and butadiene ratio S / B increased polymer solution viscosity, tensile strength and hardness increase. SBS for the two-phase structure, with two glass transition temperature Tg1 (rubber phase) and Tg2 (resin).
SBS appearance of a white cylindrical osteoporosis, the relative density of 0.92-0.95. SBS has excellent tensile strength, flexibility and electrical properties. Permanent deformation small, flex and elasticity, and surface friction large. Ozone resistance, oxygen and ultraviolet irradiation performance and SBR similar. Ventilation is excellent. As the main chain containing double bonds which SBS-aging poor, in high-temperature air oxidation conditions, butadiene block will happen crosslinking, thereby degrees and viscosity will increase. SBS soluble cyclohexane and toluene, benzene, methyl ethyl ketone, ethyl acetate, dichloroethane, do not dissolve in water, ethanol, gasoline and other solvents.
order to reduce costs, improve performance and expand the scope of application of SBS filled appropriate oil, causing oil-filled SBS.
SBS adhesive many uses. For months, contact adhesives to replace CR-phenolic adhesives, production sBS graft-adhesive, or with the production of chloroprene rubber with CR-graft SBS mixed adhesive; Production of common use of plastic shoes, shoes with primer; Dedicated manufacturing plastic bags; Production solvent-based pressure sensitive agent, hot-melt adhesives, hot melt pressure sensitive adhesive; Laminating Adhesive for paper production, polyolefin adhesive; production of plastic construction, construction sealants, CR - SBS sealant, waterproofing membrane special glue; such modified asphalt storage
in the shade, ventilation, the dry coffers. The storage period of one year.
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