Since the 1970s, China has been engaged in the development and application of polyether modified silicone oil. However, the defoaming agent industry started late, and the update of domestic defoaming agent still cannot keep pace with the industrial development. Domestic for Si - C type of polyether modified silane supply mainly rely on imports of this channel, as compared with foreign Si - C type polyether modified silicone oil research, our country to study, want to many, basically do not have new products and new technology, because on one hand, able to produce special polyether and special manufacturer of hydrogen silicone is less, the choice of raw materials co., LTD.; On the other hand, the use of polyether modified silicone oil synthesis process or follow the traditional synthesis process, so the product conversion rate is low, product crosslinking products are more, product quality is poor, its economic benefits are difficult to guarantee.In order to prepare polyether modified silicone oil according to the original synthesis process, the cost of catalyst chloroplatinic acid in the addition reaction is very high, and the reaction conditions are very harsh. If the catalyst used in the reaction is small, the side reaction in the reaction is difficult to control, the appearance color of the product will be deepened and the reaction time needs to be prolonged. The solvents in the reaction (toluene and isopropanol) are harmful to the environment and human body. If the solvent remains, the surface tension of the product will increase. In addition, in order to remove the remaining solvent of the reaction, additional processing process is required, and the equipment is complex.At present, there are a wide variety of defoaming agent varieties on the market, most defoaming agent defoaming effect is not strong, so that customers spend money, but can not achieve the desired defoaming effect, so that you can not rest assured to use or simply give up the use of defoaming agent. At ordinary times many of mixed with concrete admixtures has certain air-entraining effect, the introduction of air bubbles on the strength of concrete have side effects, good defoaming agent mixed with concrete to suppress or eliminate too much in the concrete or harmful bubble, can improve the concrete compactness, thus improve the strength of concrete, therefore developed the excellent performance of antifoaming agent is very important and urgent.