What are the advantages and disadvantages of silicone defoamer and its application?

Silicone defoamer Its main component is silicon. Due to its special chemical structure, silicone oil is not compatible with water or polar group-containing substances, and is not compatible with hydrocarbons or hydrocarbon-containing organic compounds. Silicone oil is insoluble in various substances and is a physiologically inert defoamer. Silicone defoamer has a small surface tension, and the surface oil capacity of silicone oil is generally 20-21 dynes/cm. It is smaller than water (72 dynes/cm) and the surface tension of general bubble liquid, so its defoamer The effect is good.

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What are the advantages and disadvantages of silicone defoamer and its application?

Silicone defoamer has good thermal stability, good chemical stability, strong defoaming ability, and is also a physiologically inert defoamer. The use does not affect the basic properties of the foaming system. It can be used in the fields of chemistry, paper, paint, food, textile, pharmaceutical and so on. However, since the silicone in the silicone defoamer is hardly soluble in water, it hinders its dispersion in the water system, so a dispersant is added, but the dispersant is added more, although the emulsion is stable, but The foaming effect will be affected as a result, and the amount of emulsifier used will be controlled. Because silicone is oil-soluble, it also reduces its defoaming effect in oil systems. Silicone defoamer is not ideal for long-term high temperature resistance and strong alkali resistance.


Post time: Nov-13-2019