Method for preparing high-dispersity nanosilicon dioxide particle

Abstract

The invention relates to a method for preparing high-dispersity nanosilicon dioxide particles. The method comprises the following steps: firstly, modifying nanosilicon dioxide particles to graft an azide group on the surfaces of the nanosilicon dioxide particles, preparing a polymer with a plurality of alkynyl groups on a non-terminal group of the molecular chain in a free radial polymerization mode, and finally the surfaces of the particles with the polymer through click chemistry reaction. The modified nanosilicon dioxide particles prepared by using the method are good in dispersity in organic solvents, overcome the problem of easy conglobation and have great application potential in the fields of coatings, composite materials and the like.

Description

technical field

[0001] The invention particularly relates to a preparation method of highly dispersed nano silicon dioxide particles, belonging to the technical fields of polymer chemistry and organic materials. Background technique

[0002] Nano-silica is widely used in coatings, chemical industry, composite materials, environmental protection, food, construction and other fields. However, nano-silica has small particles, large specific surface area, strong interaction between particles, and is easy to agglomerate and difficult to disperse. , the defects exposed during the application process lead to the degradation of the overall material performance, limiting its wide application.

[0003] In order to improve its dispersibility, many methods have been developed, such as patent CN 103922352 A introducing the use of polyhydric alcohols to improve its dispersibility under alkaline conditions; patent CN 103097467 A introducing the use of 1,4-butanediol and monoethylene glycol...

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