There are more types of defoamers on the market, commonly used are organosilicon, non-silicon, GPE polyether, mineral oil, and other types of defoamers. Mineral oil defoamer is one of the earliest defoamers, whose main components are composed of mineral oil, inorganic hydrophobic particles, defoaming additives, and emulsifiers. In the coating or oil-based system to defoam more obvious.
Mineral oil defoamer active ingredient role
Mineral oil defoamer mainly plays the role of defoaming, foam inhibition, and degassing, while reducing surface tension. Its defoaming substances include fatty acid metal soap, silica (silica), aluminum oxide, magnesium oxide, and zinc oxide.
How to test mineral oil defoamer defoaming performance
(1) shake the bottle test method: in the bottle with a good surfactant or foaming liquid, add 0.1 ~ 0.5% mineral oil defoamer drop by drop, shake the mixed liquid, and then register the defoaming time, which is the simplest way to test the defoaming effect, the main purpose is to test the mineral oil shot defoamer in static defoaming and foam inhibition effect.
(2) high viscosity coating test: pour 90% of the coating and 10% of benzene propylene in a stainless steel cup, turn 2min at 600r/min dispersion speed, then add 0.3% mineral oil defoamer; again at 900r/min high-speed dispersion for 5min, pour out the measuring cylinder to weigh and test its effectiveness.
Mineral oil defoamer use precautions
No matter what it is, too much is too little. Good things are needed in the right amount, just like mineral oil defoamer. Defoamer dosage must be tested based on the recommended dosage, which includes laboratory tests and field construction adding tests to determine the exact amount to be added, so the defoamer is not the more the better, and not the less the better.
No matter what type of defoamer, before use must be stirred evenly, and then use, such as layering is to stir, mineral oil defoamer before use does not have to dilute, and more is not recommended to dilute. In the face of different environmental use environments, choose a targeted defoamer, while taking into account the defoaming and foam inhibition performance and compatibility.
