Blowing agent There are three main types of foaming agents for plastics:
1 nitrogen, carbon dioxide, and air, directly pressed into the plastic melt to foam;
2 volatile liquids such as butane, pentane, petroleum ether, difluoromethylene chloride, etc., volatilize and expand after heating, and foam the plastic body, which is a common type of polystyrene foam;
3 Decomposable chemical blowing agents, which are generally solid powders which, when heated, liberate gases (usually nitrogen or carbon dioxide), which cause the plastic to produce a cellular structure and reduce weight. Most of such blowing agents are organic azo compounds such as azodicarbonamide and azobisisobutyro-nitrile (abbreviated as aIBN). Foamed plastics mainly include: aBS, PS, PVC, PU, ​​EVa, PE, PP, etc.
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