Silicone defoamers are silicon-containing surfactants as a family of organosilicon compounds that have been used in various industries since the 1960s, but the rapid development on a large scale and in full scale began in the 1980s. As a silicone defoamer, its application is also very extensive, more and more attention by all walks of life.
This product is widely used in textile printing and dyeing, papermaking, sewage treatment, cleaning agents, coatings and other defoaming. When used in printing and dyeing, the additive has good compatibility with the dyebath, and does not affect the shade and color fastness.
Silicone defoamer advantages
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. Therefore, silicone defoamers in water, animal and vegetable oils and high boiling point mineral oil dissolved evenly. Due to the insoluble nature of silicone oil, which is widely used, both water system defoaming, but also in the oil system.
Small surface tension: The viscosity of the silicone oil, the surface capacity is generally 20-21 dyne / cm, water (72 dyne / cm) and the general surface tension of the liquid foam is much smaller, which also silicone defoaming Another reason for the wide range of applications.
Good thermal stability: The commonly used dimethyl silicone oil, for example, it can withstand 150 degrees Celsius for a long time, a short time can withstand 300 degrees Celsius above, the Si-O bond does not break down. This ensures that the silicone defoamer can be used over a wide temperature range.
Good chemical stability: As the 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.
Physiologically inert: Silicone oil has been shown to be non-toxic to humans and animals with a lethal dose greater than 34 g / kg. So silicone defoamers (with a suitable emulsifier with) can be safely used in food, medical, pharmaceutical and cosmetics industries.
Strong anti-foaming: 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 amounts and is defoamed as long as one millionth of the foaming weight (1 ppm) is added. Its common range is 1 to 100ppm. This use, not only low cost, but also does not pollute the material to be defoamed.