1, silicone (resin) class
Silicone defoaming agent is also known as emulsion type defoaming agent. The method of use is to emulsify silicone resin with emulsifier (surfactant) and disperse it in water and then add it to wastewater. Silica fine powder is another kind of silicon defoaming agent with good defoaming effect.
2, surfactant class
This kind of defoaming agent is actually an emulsifier, which makes use of the dispersion effect of surfactant to keep the foaming material in the water in a stable emulsion state and disperse, so as to avoid the formation of foam.
3. Paraffins
Paraffin defoaming agent is made by emulsifying paraffin wax or its derivatives with emulsifying agent, and its use is similar to that of surfactant emulsifying defoaming agent.
4. Mineral oil
Mineral oil was used as the main defoaming component. In order to improve the effect, sometimes mixed metal soap, silicone oil, silica and other substances used together. In addition, in order to make the mineral oil easy to diffuse to the surface of the foaming liquid, or make the metal soap evenly dispersed in the mineral oil, sometimes also can add a variety of surfactants.