In industrial production, a large amount of foam will be generated due to operations such as fermentation, stirring, vibration, and boiling, which will affect the normal production, reduce the effective load of equipment, and cause product quality and production capacity to decline. Therefore, it is necessary to add a defoamer, which can quickly eliminate foam and inhibit the generation of foam. Defoamers are widely used in production industries, such as biological fermentation, pharmaceutical fermentation, sewage treatment, textile printing and dyeing, oil field drilling, papermaking, coatings, asbestos tiles, etc. industry, bringing more convenience to production. The main factors that affect the performance of defoamers are introduced below.

The effect of the amount of polyether silicone oil on the performance of the defoamer Polyether silicone oil itself has defoaming and antifoaming properties, and can produce synergistic effects with modified silica and methyl silicone oil. To determine the effect of the amount of polyether silicone oil on the performance of the defoamer, it is necessary to keep other conditions unchanged, add polyether silicone oil, change the amount, and observe the effect of the amount of polyether silicone oil on the performance of the defoamer. Experiments have proved that after adding polyether silicone oil, within a certain range, as the dosage increases, the defoaming performance of the defoamer will be enhanced, the defoaming time will be shortened, and the foam suppression time will be prolonged. In addition, the more polyether silicone oil is used, the stability of the emulsion and its dispersibility in water will also be enhanced.

The effect of viscosity and dosage of methyl silicone oil on the performance of defoaming agent Methyl silicone oil has strong defoaming ability and is insoluble in water. It has excellent defoaming performance for most foaming media. To determine the effect of the viscosity and dosage of methyl silicone oil on the defoaming performance, it is necessary to keep other conditions unchanged, only change the viscosity of methyl silicone oil, and compare the effect of its defoamer performance. Experiments have shown that: with the increase of the viscosity of methyl silicone oil, the defoaming time of the defoamer first decreases and then slightly increases, but the foam suppression time has been increasing.

Influence of compounding of emulsifier and its dosage on performance of defoamer

Emulsifier is one of the key factors in the preparation of emulsion-type silicone defoamers. Methyl silicone oil is difficult to emulsify. In order to make the emulsifier can emulsify and disperse well, the H LB value of the emulsifier should be considered to be close to the H LB value of the silicone oil (about 8-11), and the emulsifier should also be considered. The foaming power should be small, and the affinity between the emulsified system and the hydrophobic group of the emulsifier should also be considered.