Analyze how easy the silicone defoamer is!

Organosilicon defoamer is a family of silicon-containing surfactants as organosilicon compounds. This product is widely used for defoaming in dry textile printing and dyeing, papermaking, sewage treatment, cleaning agents, coatings, etc. When using silicone defoamer in printing and dyeing, it has good compatibility with additives in dye bath, and does not affect shade and color fastness.

Advantages of silicone defoamers:

Wide range of applications: Due to the special chemical structure of silicone oil, it is neither compatible with water or substances containing polar groups, nor is it compatible with hydrocarbons or organic substances containing hydrocarbon groups. Therefore, the silicone defoamer is uniformly dissolved in water, animal and vegetable oils and high-boiling mineral oils. Due to the insolubility of dry silicone oil to various substances, it has a wide range of applications. It can be used not only in water system for defoaming, but also in oil system.

Small surface tension: Silicone oil with various viscosity generally has a surface capacity of 20-21 dynes/cm, which is much smaller than the surface tension of water (72 dynes/cm) and general foaming fluids, which is also the reason for the defoaming of silicone oils. Another reason for its wide application.

Good thermal stability: Take the commonly used dimethyl silicone oil as an example, it can withstand 150 degrees Celsius for a long time, and can withstand more than 300 degrees Celsius for a short time, and its Si-O bond does not decompose. The latter ensures that the silicone defoamer can be used in a wide temperature range.

Good chemical stability: It is relatively stable due to the dry Si-O bond, so the chemical stability of silicone oil is very high, and it is difficult to chemically react with other substances. Therefore, as long as the preparation is reasonable, silicone defoamers are allowed to be used in systems containing acids, alkalis, and salts.

Physiologically inert: Silicone oil has been proven to be non-toxic to humans and animals, and its semi-lethal dose is greater than 34 g/kg. Therefore, silicone defoamers (with suitable emulsifiers) can be safely used in food, medical, pharmaceutical and cosmetic industries.

Strong defoaming power: Silicone defoaming agent can not only effectively break the foam that has been formed, but also can significantly inhibit the foam and prevent the formation of foam. It is used in a small amount, as long as one part per million (1ppm) of the foaming weight is added, it can produce a defoaming effect. Its usual range is 1 to 100 ppm. In this way, not only the cost is low, but also the substance to be defoamed will not be polluted.