SBS refers to styrene-butadiene-styrene triblock copolymer. It is a type of thermoplastic elastomer, generally called “thermoplastic styrene-butadiene rubber” and well-known as “the third generation of synthetic rubber”. SBS has both plastic and rubbery properties, showing plasticity at high temperature and elasticity at room temperature. It exhibits properties of thermoplastics without plasticating and properties of vulcanized rubber without vulcanization.
SBS has many advantages such as excellent solubility, the ability to melt at high temperature, low melt viscosity, ease of modification, and good compatibility with a lot of polymers. Thus, it is widely applied in the building decoration, printing and laminating, pressure-sensitive adhesives, woodwork, bags and suitcases, footwear, and other industries.
Currently, the type of building decorative adhesives mainly includes neoprene adhesives and SBS-based adhesives. Due to structural characteristics, SBS-based adhesives are inferior to neoprene adhesives in initial adhesion, bond strength (especially when bonding to polar materials), tack time, heat and weather resistance, and other aspects. This greatly restricts the use of SBS-based adhesives in the building decoration application.
The lack of polar groups in SBS macromolecules results in the failure of SBS-based adhesives to perfectly bond to polar substrates such as aluminum-plastic panels, fireproof boards, PVC panels. There are a lot of researches globally conducted on grafting modification, epoxidation and other aspects of SBS-based adhesives, to improve their bonding properties. However, this will undoubtedly require the increasing investment and industrial costs of adhesive manufacturers, and is difficult to put into operation because of the complicated technique.
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