Novel organic silicon defoaming agent with excellent stability and defoaming ability

Abstract

The invention discloses a method for preparing a novel organic silicon defoaming agent with excellent stability and defoaming ability. The traditional emulsion type defoaming agent is good in defoaming performance and low in stability or is high in stability and poor in defoaming performance. The method disclosed by the invention is characterized in that a certain amount of diethylene glycol monomethyl ether is added during preparation, the defect that the stability and defoaming performance of the traditional emulsion type defoaming agent are difficultly considered simultaneously is overcome, and the stability of the emulsion is greatly improved under the condition that excellent defoaming performance of the defoaming agent is guaranteed. According to the technical scheme, the organic silicon defoaming agent comprises the following four substances in percentage by mass: 10-20 percent of silicone cream, 3-5 percent of a composite emulsifier, 0.6-1 percent of CMC-HV and 2-5 percent of diethylene glycol monomethyl ether, wherein the composite emulsifier comprises 57-72 percent of peregal and 28-43 percent of fatty alcohol, and the HLB value is 9-12. The preparation method comprises the following steps: adding the four substances into a reactor, heating, uniformly stirring, and cooling to room temperature; and finally, and emulsifying at a certain rotating speed for 5 minutes by virtue of a high-shear emulsifying machine while adding water, thereby obtaining the defoaming agent.

Description

technical field [0001] The invention relates to the field of silicone defoamers, and is a novel emulsion type silicone defoamer with excellent stability and defoaming performance. Background technique [0002] Foam will greatly restrict production capacity and reduce production capacity. The existence of foam affects many production processes, and will bring unnecessary pollution to the environment and affect the national economy. Therefore, in some production processes, it is necessary to control the influence of foam on the process. [0003] In recent years, with the expansion of industrial production scale and the strengthening of environmental governance, various defoamers have emerged as the times require, and have developed into a major industry. Among them, the silicone defoamer not only has the effect of instantaneous defoaming, but also has a long-lasting anti-foaming effect, and has the advantages of less dosage, wide application range, and chemical inertness. C...

AI Technical Summary

Problems solved by technology

However, the emulsion is a thermodynamically unstable system. If the emulsification is not complete enough, the emulsion is prone to delamination and demulsification as the storage time increases, making it difficult to exert the excellent properties of the emulsion, thereby reducing its defoaming performance. However, if the emulsion system is too stable, its defoaming ability will decrease

Some products of traditional defoamers have good defoaming performance, but the emulsion is not stable enough, and they are easy to break when used, which limits their use; some products have good stability, but their defoaming performance is poor

Therefore, the traditional emulsion-type defoamer still needs a breakthrough in terms of not affecting the defoaming performance and having better stability.

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