Surfactant for dry grinding-assisted modification of silica powder and preparation method of surfactant

Abstract

The invention relates to a surfactant for dry grinding-assisted modification of silica powder, which is characterized in that the surfactant has the following structure: R is alkanes, the number n ofchain segments is x + y + z, n is more than or equal to 4 and less than or equal to 12, and A and B groups are any one of epoxy groups, amino groups and vinyl groups. The preparation method has the advantages that 1, the surfactant prepared by the preparation method has grinding aid and modification effects, the dry grinding efficiency can be improved, the energy consumption is reduced, and the problem that the particle size limit is difficult to reach due to agglomeration of ultrafine particles is solved; the silicon micro-powder can be subjected to surface modification, so that the silicon micro-powder has good compatibility with various resin systems, and the mechanical and electrical properties of the terminal composite material are improved while the use amount of the resin is reduced; and 2, the preparation method is simple to operate, the condition parameters are easy to control, and no pollution is caused to the environment;

Description

technical field [0001] The invention belongs to the technical field of powder surface modification, relates to the technical field of silicon micropowder dry method modification, in particular to a surfactant for dry method grinding modification of silicon micropowder and a preparation method thereof. Background technique [0002] Microsilica powder is a non-toxic, odorless, non-polluting inorganic non-metallic material. It has excellent properties such as good temperature resistance, acid and alkali corrosion resistance, poor thermal conductivity, high insulation, low expansion, stable chemical properties, and high hardness. It is widely used in chemical industry, electrical and electronics, functional plastics, functional coatings, functional rubber and other fields. The processing technology of microsilica powder includes dry method and wet method. Considering the economic cost and quality stability, for the requirement of D100≥5um particle size index, dry grinding-classi...

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Problems solved by technology

[0004] At present, there is no specific grinding aid modified surfactant on the market, which is suitable for the dry grinding process of silica powder, and takes into account the functions of grinding aid and modification at the same time; silane surfactants can be used as grinding aids, but due to their The molecular chain is short, the steric hindrance effect is not enough, and the grinding aid and dispersion effect are not obvious in the ultrafine grinding process. In addition, its hydrophobic group only contains one functional functional group, which cannot be suitable for various resin systems at the same time.

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