Advantages and disadvantages of silicone defoamer
Advantages: Strong defoaming ability: silicone defoaming agent can quickly break bubbles, and can significantly inhibit foam and prevent foam regeneration. At the same time, the amount of silicone defoamer is small, and the use range is 1 to 100ppm, which not only has low cost, but also does not pollute the foamed material. Good heat resistance: Taking dimethyl silicone oil as an example, it can be used for a long time in an environment of 150 ° C, and the temperature resistance of up to 300 ° C for a short time, so silicone defoaming agent can be used in a wide temperature range. Stable chemical properties: it is difficult to react with other substances, as long as the preparation is reasonable, it can be used in the system containing acid, alkali and salt.
Disadvantages: silicone defoamer is a water-soluble product, and it is difficult to dissolve in the foaming liquid of the oily system, so it has a poor defoamer effect in the oily system. The acid-base range of organic silicon defoamer is limited, and organic silicon defoamer has an acid-base range of use, which will break milk in the system of strong acid and strong base, affecting the use effect.