The defoamer is so powerful. Don't believe it? Just take a look! 


01



Foam refers to a dispersion of air, carbon dioxide and other gases in liquids such as water, oil, slurry and dyeing liquid. There are two aggregation states of foam: one is sparse foam, where the interaction force between bubbles is weak and they do not aggregate into foam; the other is dense foam, where the foam is dense and this is the true foam. Usually, a small amount of a certain substance is added to the slurry, dyeing liquid and other dispersions to inhibit the formation of foam. This substance is called a "defoamer". Simply put, any substance that can make foam disappear quickly when added in small amounts is called a "defoamer". Most defoamers belong to the type of surfactants. Defoamers must be able to reduce the surface elasticity and surface viscosity of foam, thereby reducing the stability of foam. 






02




During the production process 


Defoamers can prevent and eliminate harmful bubbles generated during the process, ensuring smooth operation. They are usually oil-like substances with low volatility and strong diffusion ability, or water-soluble surfactants. 


03




The following aspects can demonstrate some performance characteristics of defoamers: 


Defoamers reduce the surface tension of the foam liquid film locally to eliminate foam. As the surface tension of the defoamer droplets is lower than that of the foam liquid film, when defoamers are added to the foam system, the defoamer droplets come into contact with the foam liquid film, which can reduce the surface tension of the foam liquid film at this point, while the surface tension of the liquid film around other foams remains almost unchanged. In this way, the part with reduced surface tension is strongly pulled and extended in all directions, eventually causing the foam to break and achieve the defoaming purpose. 







(2) Defoamers destroy the elasticity of the liquid film, causing it to lose its self-repairing function and thus defoaming. The elasticity of the liquid film is usually one of the important factors affecting the stability of foam. 








(3) Defoamers reduce the viscosity of the liquid film, shortening the foam's lifespan and causing it to dissipate. A high surface viscosity of the foam liquid film increases the strength of the liquid film, slows down the drainage rate of the liquid film, reduces the permeability of the liquid film, and hinders the diffusion of gases within the bubbles, thereby extending the foam's lifespan and stabilizing it.