A brief introduction to blowing agents

Foaming agent is a substance that makes the object substance porous, which can be divided into three categories: chemical foaming agent and physical foaming agent and surfactant. Chemical foaming agent is a compound that can release gases such as carbon dioxide and nitrogen after heating and decomposition, and form fine pores in the composition of the polymer; Physical foaming agent is a chemical compound formed by the change of the physical form of a substance, that is, by the expansion of compressed gas, the volatilization of liquid or the dissolution of solid. The foaming agents have high surface activity, can effectively reduce the surface tension of the liquid, and arrange the double electron layer on the surface of the liquid film to surround the air, forming bubbles, and then composed of a single bubble.