Problems of PESO defoamer


Since the 1970s, China has been engaged in the development and application of polyether modified silicone oil, which is difficult to overcome. However, the defoamer industry started late, and the update of domestic defoamers can not keep up with the pace of industrial development. Domestic supply of Si-C type polyether modified silane mainly depends on import, because compared with foreign research on Si-C type polyether modified silicone oil, there is much less research on it in our country. There are basically no new products and processes. On the one hand, it can produce special polyether and special content. On the other hand, polyether modified silicone oil is still synthesized by traditional synthesis process, so the conversion rate of the product is low, there are more cross-linking products in the product, the product quality is poor, and its economic benefits are difficult to guarantee.


Polyether modified silicone oil was prepared according to the original synthesis process. The cost of catalyst chloroplatinic acid in addition reaction would be very high, and the reaction conditions would be very harsh. If the amount of catalyst in the reaction is small, the side reaction is difficult to control, the appearance color of the product will deepen and the reaction time needs to be prolonged. Solvents (toluene and isopropanol) in the reaction are harmful to the environment and human body. If the solvent remains at the same time, the surface tension of the product will increase. In addition, in order to remove the residual solution of the reaction. Additional treatment is required for the agent, and the equipment is complex.


At present, there are a variety of defoamers on the market. Most defoamers have good defoaming effect and weak anti-foaming effect, which makes customers spend money, but can not achieve the desired defoaming effect, so that people can not safely use or simply give up the use of defoamers. Many admixtures in concrete have certain air-entraining effect at ordinary times. The introduction of bubbles has certain side effects on the strength of concrete. The addition of good defoamer into concrete can restrain or eliminate excessive or harmful bubbles in concrete, which can improve the compactness of concrete and the strength of concrete. The excellent defoamer is undoubtedly very important and urgent.


Transfer from China Admixture Network