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Jan 17, 2018
The advantages of silicone defoamers
(1) Wide range of applications: Due to the special chemical structure of silicone oil, it is neither compatible with water or polar group-containing substances nor with hydrocarbon or hydrocarbon-containing organic matter. Due to the insoluble nature of silicone oil, which is widely used, both water system defoaming, but also in the oil system.
(2) small surface tension: the surface power of silicone oil is generally 20-21 dyne / cm, than the water (72 dyne / cm) and the general foaming liquid surface tension is small, good defoaming efficiency.
(3) good thermal stability: the usual dimethyl silicone oil, for example, it can withstand 150 ℃ for a long time, a short time can withstand 300 ℃ or more, the Si-O bond does not decompose. It ensures that the silicone defoamer can be used in a wide temperature range.
(4) good chemical stability: As Si-O bond is relatively stable, so the chemical stability of silicone oil is very high, it is difficult to chemical reaction with other substances. Therefore, silicone defoamers are permitted to be used in systems containing acids, bases, and salts, provided the formulation is reasonable.
(5) Physiologically Inert: Silicone oil has been shown to be non-toxic to humans and animals with a lethal dose greater than 34 g / kg. Therefore, silicone defoamers (with suitable non-toxic emulsifier, etc.) can be safely used in food, medical, pharmaceutical and cosmetics industries.
(6) strong defoaming: silicone defoamer not only can effectively break the foam has been generated, but also significantly inhibited the foam, to prevent the formation of foam. It is used in very small quantities and is defoamed as long as one millionth of the weight of the foaming medium is added (1 ppm). Its common range is 1 to 100ppm. Not only low cost, but also does not pollute the material being defoamed.