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Advantages of silicone defoamers

Views: 0     Author: Site Editor     Publish Time: 2021-02-25      Origin: Site


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1. Wide application range: due to the special chemical structure of silicone oil, it is neither compatible with water or substances containing polar groups, nor with hydrocarbons or organic substances containing hydrocarbon groups. Therefore, the silicone defoamer dissolves evenly in water, animal and vegetable oils and high-boiling mineral oils. Due to the insolubility of silicone oil to various substances, it has a wide range of applications. It can not only use water system to defoam, but also can be used in oil system.

2. Small surface tension: silicone oils with different viscosity generally have a surface capacity of 20-21 dyne/cm, which is much smaller than the surface tension of water (72 dyne/cm) and general foaming liquids. This is also silicone Another reason for the wide application of defoamers.

3. Good thermal stability: Take the commonly used dimethicone as an example, it can withstand 150 degrees Celsius for a long time, and can withstand more than 300 degrees Celsius for a short time, and its Si-O bond will not decompose. This ensures that the silicone defoamer can be used in 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, silicone defoamers are allowed to be used in systems containing acids, alkalis and salts.

5. Physiological inertia: Silicone oil has been proven to be non-toxic to humans and animals, and its half-lethal dose is greater than 34 g/kg. Therefore, the silicone defoamer (with a suitable emulsifier) can be safely used in the food, medical, pharmaceutical and cosmetic industries.

6. Strong defoaming power: Silicone defoamers can not only effectively break the foam that has been generated, but also can significantly inhibit the foam and prevent the formation of foam. Its usage is very small, as long as it is added one part per million (1ppm) of the foaming weight, it can produce defoaming effect. The commonly used range is 1 to 100 ppm. In this way, not only the cost is low, but also the defoamed substance is not polluted.

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