Silicone emulsion type defoamers are generally oil-in-water (O/W) emulsions, ie water is the continuous phase and silicone oil is the discontinuous phase. It is premixed with silicone oil, emulsifier and thickener, and then gradually mixed with water, and finally repeatedly ground in a colloid mill until a desired emulsion is obtained.
Silicone oil emulsion antifoam is the most widely used and defoaming agent in silicone defoamers. It is characterized by easy dispersion in water systems and can be widely used as a defoaming agent for aqueous systems. When used, the emulsion is directly added to the foaming system to obtain a good defoaming effect. In order to improve the defoaming effect and measurement accuracy of the emulsion, it is generally not necessary to directly use more than 10% of the concentrated silicone oil emulsion: instead, it is first diluted with cold water or directly with a foaming liquid to 10% or less. Do not use a liquid that is overheated or too cold to dilute, otherwise it will cause the emulsion to break. The stability of the emulsion will be deteriorated after dilution, and stratification (bleaching) may occur during storage, that is, demulsification. Therefore, the diluted emulsion should be used up as soon as possible. If necessary, a thickener may be added to increase the stability of the emulsion. For batch operation, the silicone oil emulsion can be added one time before the operation of the system, or it can be added in batches; for continuous operation, the silicone oil emulsion should be continuously or intermittently added at the appropriate part of the system.
When using an emulsion type defoamer, special consideration should be given to the temperature and acidity and alkalinity of the foaming system. Because the silicone oil emulsion is more delicate and exceeds its range of use, the emulsion will break prematurely and become inefficient or ineffective. (The amount of the silicone oil emulsion is generally 10 to 10 ppm by weight of the foaming liquid (in terms of silicone oil). Of course, there are also less than 10 ppm and more than 100 ppm in special cases. The optimum amount is mainly determined by experiments.
Zilibon is a manufacturer with 16 years of application experience. It has far more defoaming technology than other antifoaming agents in the market. From the above cases, we prove the strength of our Zilibon defoamer. We have a group of excellent defoaming engineers, and An independent laboratory that facilitates defoaming experiments with foam that are difficult for customers to solve. If you want to know more about defoaming agent products, you can call our hotline: +86 13929201380.This article is from the manufacturer of Zilibon defoamer ( ), please indicate the source if you need to reprint.