There are many kinds of defoaming agents, and the classification is full of diversification. We have discussed above, according to the principle of action can be divided into antifoaming agent, antifoaming agent and defoaming agent three types; According to the effective components in the defoaming agent can be divided into silicone defoaming agent, polymer defoaming agent, mineral oil defoaming agent.Polyether defoaming agents are widely used in recent years and have good defoaming properties. The advantage of polyether defoaming agent is that it is not toxic, and it is convenient to use. The most important thing is that it has good anti-foaming performance, dispersibility, thermal stability and chemical stability, which ensure the stability of the defoaming agent. The biggest disadvantage of this kind of defoaming agent is that the efficiency of defoaming is relatively low, that is, when the foam has been produced in the system, it is difficult for polyether defoaming agent to eliminate the foam quickly. This also tells us that polyether defoaming agents should be added in the initial stage of the paint process, so as to effectively inhibit the formation of foam, give full play to the excellent foam defoaming agent. The advantages of silicone defoaming agent are strong defoaming, low temperature requirements for the use of the environment, physical and chemical properties are stable and physiological inertia will not bring harm to the human body, in the water-based coating system and non-water-based coating system can be applied. The disadvantage of organosilicon defoaming agent lies in its complicated preparation process. If the control is not good, the defoaming effect of the defoaming agent will be affected. Due to its low surface tension, surface shrinkage defects.Although polyether and organosilicone have good performance, there are still some shortcomings. In order to learn from each other and make the best use of their respective defoaming properties, they were combined, thus obtaining the mixed defoaming agent of silica ether. The polyether modified polysiloxane mixed silica ether defoaming agent prepared by grafting method not only has the advantages of good defoaming performance and low surface tension of silicone defoaming agent, but also has the advantages of high temperature resistance and compatibility of polyether defoaming agent.Through the application data, the advantages of polyether modified silicone defoaming agent in terms of anti-foaming performance are shown, the compatibility of silicone defoaming agent is improved, and surface defects such as shrinkage are reduced