Physical and chemical properties foaming agent

① physical foaming agent: is generally odorless, non-toxic, inert gas, or a good stability, low boiling point non-flammable liquid. Common inert gases are nitrogen, carbon dioxide, and air, low boiling point liquids used tetrachloroethane, methylene chloride, and pentane. In addition, the dissolution of

Solid compound (such as salt) is also commonly used physical blowing agents. Physical blowing agents suitable for polystyrene, polyethylene, polypropylene, polyvinyl chloride foam
② chemical blowing agents: stable at room temperature, and the plastic processing temperature could explain the large amount of gas of the compound. In the foam manufacturing applications is very common. The chemical blowing agent used in industry is the release of most of the nitrogen gas as the main component of an organic compound, and

Can decompose and release ammonia or carbon dioxide, respectively, ammonium bicarbonate and sodium bicarbonate. Chemical blowing agents suitable for various multi-foamed thermoplastics. In order to reduce chemical decomposition temperature of the blowing agent, to improve its dispersion and the amount of foam, often can be activated using one of the

Science foam blowing agent accelerator, or co-blowing agents, such as salicylic acid and urea.