Foam is a dispersion of the gaseous material as a dispersed medium with a solid resin as a dispersion medium. It is a kind of plastic product with many pores. As the foam has a light weight, low thermal conductivity, low hygroscopicity, good elasticity, high specific strength, noise insulation and so on. It is widely used as silencer insulation, antifreeze insulation, cushioning and light structure materials, in the transportation, housing construction, packaging, daily necessities and military and military industry has also been widely used.
A kind of macromolecule material formed by dispersing a large amount of gas micropores in solid plastic has the characteristics of light weight, heat insulation, sound absorption and shock absorption, and the dielectric properties are better than those of matrix resin. Almost all kinds of plastic can be made of foam, foam molding has become an important area of plastic processing.
Also known as porous plastic. Made of resin as the main raw material with numerous microporous plastic. Light, adiabatic, sound-absorbing, shockproof, corrosion-resistant. There are soft and hard points. Widely used for insulation, noise, packaging materials and the system of the ship and so on. Foam, microporous plastic, the whole contains numerous microporous plastic.
There are many tiny pores inside the plastic. By mechanical method (in the process of mechanical stirring at the same time into the air or carbon dioxide to foam) or chemical method (by adding blowing agent) in the system. Split hole type and hole type. Closed holes in the stomata isolated from each other, there are floating; hole in the pores of the interconnected, no floating. Can be made of polystyrene, polyvinyl chloride, polyurethane and other resins. Can be used for insulation and sound insulation materials, use a wide range.
A polymer material formed by the dispersion of a large number of gas micropores in a solid plastic. The structural foam developed in the 1960s, characterized by foaming in the core layer, non-foaming of the cortex, external hard internal toughness, higher strength than the strength of the unit mass, Used in the construction and furniture industry. Polyolefin chemical or radiation cross-linked foaming technology to be successful, so that a substantial increase in the production of foam. The blended, filled, reinforced and other modified plastic foam, with better overall performance, to meet the needs of a variety of special purposes. For example, glass fiber reinforced polyurethane foam made by reactive injection molding has been used as a structural component for aircraft, automobiles, computers and the like. Foam made of polybenzimidazole filled with hollow glass microspheres is lightweight and resistant to high temperature , Has been used in spacecraft.