Superfine high-purity spherical silica powder surface modification process

Abstract

The invention discloses a superfine high-purity spherical silica powder surface modification process, and belongs to the technical field of organic silicon materials. Comprising the following steps: adding silica powder and a low-molecular-weight silane coupling agent into a modification kettle, carrying out negative-pressure nitrogen replacement deoxygenization and heating reaction, then continuously dropwise adding high-molecular-weight polysiloxane and a functional monomer, controlling reaction conditions to carry out curing reaction, and finally carrying out post-treatment to obtain the modified silica powder product. According to the process, through double modification of chemical grafting and physical coating, the surface modification degree and dispersity of the silica powder are remarkably improved, and the process is suitable for application requirements of high-performance composite materials, easy and convenient to operate, high in cost effectiveness and suitable for large-scale industrial production.