Organic silicon defoaming agent and preparation method thereof

Abstract

The invention belongs to the technical field of a defoaming agent and preparation of the defoaming agent, and relates to a composite organic silicon defoaming agent and a preparation method of the composite organic silicon defoaming agent. The organic silicon defoaming agent is prepared from the following ingredients in percentage by weight: 48 percent to 54 percent of distilled water, 1.1 percent to 2.48 percent of silicon dioxide, 38 percent to 48.5 percent of simethicone, 1 percent to 3 percent of emulsifying agents, 1 percent to 6 percent of assistants for emulsifying agents and 0.5 percent to 1 percent of stabilizing agents, and the total weight percentage is 100 percent. During the preparation, a main defoaming agent is prepared from the silicon dioxide and the simethicone; then, the distilled water, the assistants for emulsifying agents, the stabilizing agents and the stabilizing agents are sequentially and proportionally added into a reaction device; after the materials are completely dissolved, the main defoaming agent is added for emulsification, and the organic silicon defoaming agent is obtained. The defoaming agent has the advantages that the preparation process is simple; the raw materials can be easily obtained; the cost is low; the prepared organic silicon defoaming agent can maintain good defoaming and foam inhibiting performance; meanwhile, the characteristics of high efficiency, stability, alkali resistance, heat resistance and the like are realized.

Description

Technical field: [0001] The invention belongs to the technical field of defoamers and their preparation, and relates to a compound type silicone defoamer and a preparation method thereof. Background technique: [0002] Since Quincke, a German experimental physicist, first proposed to use chemical methods to defoam, it has undergone four updates so far. The first generation of defoamers are organic substances such as mineral oil, fatty acids and fatty acid esters, fatty amides, and lower alcohols. The ability is poor; the second-generation defoamer is a polyether defoamer, mainly including linear polyether and polyether or end-group esterified polyether derivatives with alcohol and ammonia as initiators. Strong, it is the leading defoamer used in the fermentation industry at present, but the foam breaking rate is low, and a certain amount of defoamer needs to be added. In order to meet the defoaming requirements and changing operating conditions, a silicone defoamer has been...

AI Technical Summary

Problems solved by technology

Chinese patent CN103074784 proposes a composite silicone defoamer with starch as a stabilizer, which increases the stability of the product and can prevent the occurrence of coagulation and demulsification, but due to the large amount of stabilizer, the defoaming Performance deterioration; Chinese patent CN104225965 proposes an emulsion-type silicone defoamer using high-boiling silicone oil as one of the raw materials, which reduces production costs and provides a reasonable treatment channel for the by-product high-boiler treatment of organic silicon monomers; Polyvinyl alcohol (PVA) is a thickener, but it will produce foam in the process of dissolving in water, which will reduce the production capacity and affect the quality and use of products; Chinese patent CN103603215 proposes to make siloxane Particles are not easily broken in a strong acid-base system, and the product can be used under harsh conditions, but the production cost is high and the preparation process is relatively complicated; CN103830938 proposes to use nonionic surfactants as emulsifiers, which can be Tween-60, At least any one of Span-40 or polyether silicone oil, with high emulsifying ability, but the product has poor alkali resistance and high cost