Defoamer is a chemical additive that reduces and hinders the formation of foam in industrial process liquids. The terms defoamer and antifoaming agent are often used interchangeably. Commonly used agents are insoluble oils, dimethicones and other silicones, certain alcohols, stearates and glycols. Mineral oil defoamers are based on oil carriers. The oil may be a mineral oil, a vegetable oil, a white oil or any other oil that is insoluble in the foaming medium other than silicone oil. The mineral oil defoamer also contains wax and/or hydrophobic silica to enhance performance. Typical waxes are ethylene bis stearamide (EBS), paraffin waxes, ester waxes and fatty alcohol waxes. These products may also contain surfactants to improve emulsification and dispersion in the foaming medium.
Mineral oil defoamer Mineral oil defoamer is also an important type of defoamer, which is mainly used in inks, adhesives, coatings and other aspects of the more extensive. The basic composition of mineral oil type defoamer is mineral oil, hydrophobic particles and emulsifiers. The basic preparation process is to mix the mineral oil and hydrophobic particles at high temperature to facilitate the dispersion of hydrophobic particles in mineral oil, from "secondary aggregation" to "primary aggregation", and then add emulsifier at low temperature to achieve the Uses of self-emulsifying dispersion of defoamer in water. However, according to different industries and different processes, sometimes it is necessary to have good dispersion of defoamers, and sometimes it is not necessary to have good dispersion of defoamers. This is because these industries themselves use a large number of dispersants, wetting agents and other surfactants, they can also disperse the defoamer, play the best role of defoamer.