Blowing agent is a kind of material that can make objects into pores. Generally, it can be divided into three categories: chemical blowing agent, physical blowing agent and surface active agent. It not only produces a large amount of foam, but also produce these large amounts of foam has excellent performance and is able to meet the requirements of product variety of foaming technology, and really can use surfactants or surfactant in the actual production process in. The excellent properties of the foaming agent mainly is very powerful in the foaming ability, unit volume can produce a large amount of foam, and the foam is very stable, can achieve long time bubble defoaming, the foam is very delicate, and can use the medium to mix well.