Defoamer, as an important industrial auxiliary, is widely used in many fields such as chemical industry, textile, papermaking, food processing, pharmacy, etc. Its core role is to effectively inhibit and eliminate the foam generated on the surface or inside of the liquid. Although foam plays a positive role in some occasions, such as flotation

separation, in most industrial production processes, the existence of foam will hinder heat transfer, reduce equipment efficiency, increase energy consumption, and even affect product quality. Therefore, the research and application of defoamers are particularly important.

Defoamers eliminate foam mainly by reducing the surface tension of foam, destroying the stability of foam film or promoting the coalescence of foam.

According to their chemical composition, defoamers can be divided into various types such as silicones, mineral oils, polyethers, organosilicon modified polyethers, fatty acids, etc. Each type has differences in applicable environment, effectiveness, and environmental friendliness.