Application wide: because of the special chemical structure of silicone oil, it is neither soluble with water or substances containing polar groups, nor with hydrocarbons or organic compounds containing hydrocarbons. Therefore, silicone defoaming agent in water, animal and vegetable oil and high boiling point mineral oil uniformly distributed dissolution. Because of the insolubility of silicone oil to all kinds of substances, it is widely used, both in water system defoaming and in oil system.
Small surface tension: kind of viscosity of silicone oil, its surface capacity is generally 20-21 dunes/cm, than water (72 dunes/cm) and general foam surface tension is much smaller, this is also silicone defoaming agent application wide another reason.
Good thermal stability: in common use of dimethyl silicone oil, for example, it can withstand 150 degrees Celsius for a long time, short time can withstand more than 300 degrees Celsius, the Si-O bond does not decompose. This ensures that silicone defoaming agent can be used in a wide temperature range.
Good chemical stability: because the Si-O bond is relatively stable, so the chemical stability of silicone oil is very high, and it is difficult to react with other substances. Therefore, as long as the preparation is reasonable, silicone defoaming agent is allowed to be used in the system containing acid, alkali and salt.
Physiological inertness: Silicone oil has been shown to be non-toxic to humans and animals, with a half lethal dose greater than 34 g/kg. So silicone defoaming agent (in the appropriate combination of emulsifier) 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 generated, but also significantly inhibit the foam and prevent the formation of foam. It is used in very small quantities and can be used as little as one millionth of the foaming weight (1ppm) to produce an antifoaming effect. Its common range is 1 to 100ppm. In this way, not only the cost is low, but also does not pollute the material that is defoamed.