A deeper understanding of the mechanism of action of defoamers can help us better select and apply these materials. This article will explain the working principle of defoamers in concrete from both chemical and physical perspectives.

Defoamer molecules usually have specific polar and non-polar groups, which can quickly adsorb onto the surface of bubbles, reduce surface tension, thin the bubble film, and make it easy to rupture. At the same time, some defoamers can also react with other components in the foam system to change its stability.

Defoamer molecules form a dense film on the surface of bubbles, preventing them from merging and growing. At the same time, they can also promote the rapid flow of liquid between bubbles, accelerating the discharge and dissipation of bubbles. In addition, some defoamers also have certain diffusivity and permeability, which can penetrate

into the foam system and solve the problem from the root.