Other mechanism of action of anti-foaming agent

The impact of expansion

   The bubble film will break if it receives a certain degree of impact. The impact of the added anti-foaming agent on the bubble film can also rupture the bubble film.

 Solubilize the foaming surfactant

   Some low-molecular substances that can be fully mixed with the solution can solubilize the foam-promoting surfactant and reduce its effective concentration. It is often found that surfactants have lower surface activity in mixed solvents than in pure solvents. Low-molecular substances with this effect, such as octanol. It not only reduces the surface active agent of the surface layer, but also dissolves into the surface active agent adsorption layer to reduce its adhesion. Through the above two aspects, the foam stability is weakened. This is a mechanism of action of the soluble anti-foaming agents ethanol, propanol, octanol, etc. In order to facilitate defoaming, appropriate alcohols are often added to the formulation of silicone anti-foaming agents, which also play a certain auxiliary defoaming effect.

The electrolyte disintegrates the electric double layer of the surfactant

   For the foaming liquid that generates foaming stability by the mutual repulsion of the surfactant electric double layer of the foam, adding some ordinary electrolytes, adding some ordinary electrolytes, can collapse the electric double layer of the surfactant and play a defoaming effect. 

Amber Zhang Ms.

Foreign trade 

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