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Advantages of silicone defoamer

发布时间：2024-07-04

(1) Wide application: Due to the special chemical structure of silicone oil, it is neither soluble with water or substances containing polar groups, nor soluble with hydrocarbons or organic compounds containing hydrocarbon groups. Due to the insolubility of silicone oil to various substances, it has a wide range of applications, even if it is defoamed in water system, it can be used in oil system.

(2) the surface tension is small: the surface capacity of silicone oil is generally 20-21 dyne/cm, which is smaller than the surface tension of water (72 dyne/cm) and general foaming liquid, and the defoaming efficiency is good.

(3) Good thermal stability: Take the commonly used dimethyl silicone oil as an example, it can withstand 150 ℃ for a long time and above 300 ℃ for a short time, and its Si-O bond does not decompose. This ensures that silicone defoamers can be used over a wide temperature range.

(4) Good chemical stability: Because the Si-O bond is relatively stable, the chemical stability of silicone oil is very high, and it is difficult to chemically react with other substances. Therefore, as long as the formulation is reasonable, the silicone defoamer is allowed to be used in the system containing acid, alkali and salt.

(5) 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 non-toxic emulsifiers, etc.) can be safely used in food, medical, pharmaceutical and cosmetic industries.

(6) Strong defoaming power: Silicone defoaming agent can not only effectively break the foam that has been generated, but also significantly inhibit the foam and prevent the formation of foam. Its use amount is very small, as long as the addition of the weight of the foaming medium (1ppm), that can produce a defoaming effect. A typical range is 1 to 100ppm. Not only the cost is low, but also does not pollute the defoamed material.

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