Polystyrene - raw material for foam
At present, most of the commodity packaging is inseparable from foam plastics, and a considerable part of them belong to expanded polystyrene resin. The styrenic resin includes a series of resins obtained by homopolymerizing a styrene monomer or copolymerizing with other monomers, and is one of the main types of general-purpose thermoplastic resins.
At the beginning of the development of styrene, only homopolymer, namely general-purpose polystyrene (GPPS), which is a simple repeating structure of styrene monomer, is hard and brittle, has poor heat resistance and is flammable. A lot of improvement work has been done for this purpose, and various modified varieties have been developed to form general-purpose polystyrene, high impact polystyrene (HIPS), expandable polystyrene (EPS), and acrylonitrile-styrene.
Copolymer (AS) and acrylonitrile-butadiene-styrene copolymer (ABS) represent a large series of styrenic resins. Among them, ABS resin is the fastest growing variety in the series.
The use of styrenic resins is extensive.
General-purpose polystyrene is the most basic type of styrene resin, and is widely used in daily necessities, stationery, instrument housings, electronic and electrical parts.
The main use of high-impact polystyrene is two-fold. First, as a packaging material, in addition to food packaging, it is used in cosmetics, daily necessities, mechanical instruments and cultural and educational supplies. Second, because it has high impact resistance. Strength, used in a large number of household appliances, electrical accessories, buttons, automotive parts, medical equipment accessories.
Expanded polystyrene ranks second in the world's foams, second only to foamed polyurethane plastics, and is widely used as packaging materials. Nowadays, most of the household appliances are packed with such expanded polystyrene. Shaped products.