Advantages:

1) Wide application: because of the special chemical structure of silicone oil, it is not soluble with water or substances containing polar groups, nor with hydrocarbons or organic compounds containing hydrocarbons. Because of the insolubility of silicone oil to various substances, it is widely used, not only for defoaming water system, but also for oil system.

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

3) Good thermal stability: take the commonly used dimethyl silicone oil as an example, it can be resistant to 150℃ for a long time, and can be resistant to more than 300℃ for a short time, and its Si-O bond does not decompose. This ensures that silicone defoamer 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 react with other substances. Therefore, silicone defoamer is allowed to be used in systems containing acid, alkali and salt as long as it is properly prepared.

5) Physiological inertia: Silicone oil has been proved to be non-toxic to humans and animals, and its semi-lethal dose is greater than 34 g/kg. So silicone defoaming agent (with suitable non-toxic emulsifiers) can be safely used in food, medical, pharmaceutical and cosmetic industries.

6) strong defoaming power: silicone defoaming agent can not only effectively break the generated foam, but also can significantly inhibit the foam to prevent the formation of foam. It is used very little, as long as the foaming medium added to one millionth of the weight (1ppm), that is, can produce a defoaming effect. Its common range is 1 to 100ppm. Not only low cost, and do not pollute the defoaming material.