Preparation method of amino polyether organic silicon compounded antifoaming agent

Abstract

The invention relates to a preparation method of an amino polyether organic silicon compounded antifoaming agent. The method comprises the following technological steps: (1) adding allyl glycidyl ether and a platinum catalyst into a container, heating under stirring and reflux condensing conditions in the protection of N2, adding a toluene solution of hydrogen-containing silicone oil when the temperature rises to a certain level, after the reactions, removing the solvent and substances with low boiling points in a rotary evaporator, and drying so as to obtain epoxy modified silicone oil; (2) adding the epoxy modified silicon oil obtained in the step (1) and an ethanol solution of polyether amine into a container, heating under stirring, carrying out reactions under the reflux condensing conditions in the protection of N2, after the reactions, removing ethanol in a rotary evaporator, and drying so as to obtain amino polyether organic silicon; (3) compounding the amino polyether organic silicon obtained in the step (2) with a certain amount of silicone cream, a mixed emulsifier, and a thickening agent to prepare the amino polyether organic silicon compounded antifoaming agent. In the provided method, amino polyether organic silicon is prepared through a silicon-hydrogen addition / amination reaction and then is compounded with an emulsifier, a thickening agent, and silicon cream so as to prepare the amino polyether organic silicon compounded antifoaming agent, which can be dissolved in water quickly, has the advantages of excellent heat resistance, acid resistance, alkali resistance, and antifoaming property, and has the same performance as that of antifoaming agents in the market.

Description

technical field [0001] The invention relates to a method for an amino polyether silicone compound defoamer, which is mainly used in food, paint, ink and chemical industries. Background technique [0002] The research on silicon-based defoamers started earlier in foreign countries, mainly from the 1930s, when many defoamers with excellent performance were developed. In my country, the research on silicon-based defoamers started late in the 1980s , technology and technology are progressing day by day, but domestic and foreign silicon-based defoamers still have a large suspension difference in terms of scale, performance, and type. For some high-precision and high-end instruments, the defoamers used still need to be imported . At present, the silicon-based defoamer market in the world is huge. According to incomplete statistics, it has reached billions of dollars. Companies such as Dow Corning in the United States and Wacker in Germany are still expanding their production scale....

AI Technical Summary

Problems solved by technology

[0005] The primary purpose of the present invention is to overcome the shortcomings of previous defoamers with single components and few suitable foaming systems, and provide a method for preparing an aminopolyether silicone compound defoamer. The method utilizes hydrosilicon addition / In the method of nucleophilic ring-opening addition reaction, first, hydrogen-containing silicone oil and allyl glycidyl ether undergo hydrosilylation under the action of a platinum catalyst to obtain epoxy-modified silicone oil; The epoxy group undergoes nucleophilic ring-opening addition reaction to prepare an amino polyether silicone; compound the amino polyether silicone with emulsifier, thickener, silicone paste, etc. to obtain a white emulsion type Defoamer, the defoamer gives full play to the synergistic effect between the components, can be quickly dissolved in water, has excellent heat resistance, acid and alkali resistance, excellent antifoaming performance, and is applicable to a wider range of foaming systems

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