One-step method obtains the preparation method of superhydrophilic silica sol

Abstract

The invention relates to a preparation method for obtaining a super-hydrophilic silica sol through a one-step method. The preparation method comprises the following steps: 1) selecting a surfactant capable of being dissolved in water and reducing surface tension; 2) sequentially and rapidly adding 1-20 parts of the surfactant, 30-92 parts of water, 18-45 parts of ammonia water, and 10-32 parts of tetraethoxysilane (TEOS) to a reaction bottle, and carrying out sealing stirring for 1-10 min; and 3) adding 800-1500 parts of ethanol within 30 min, and stirring for 12-24 h at a speed of 600-900 rpm to obtain the long-acting super-hydrophilic silica sol, wherein the surfactant comprises a commercially available alcohol amine salt type anion fluorocarbon surfactant, a quaternary ammonium salt type cation fluorocarbon surfactant and a potassium carboxylate type anion fluorocarbon surfactant, and one or a plurality of the materials selected from the fluorocarbon surfactants are sequentially compounded according to a ratio of 0-45:0-720:0-280 to obtain the surfactant, such that the problem that stability of the sol system is reduced due to fluorocarbon surfactant addition is solved. In addition, product preparation operations are simple, a preparation period is short, and industrialization is easily achieved.

Description

technical field [0001] The invention relates to a method for preparing superhydrophilic silica sol in one step by adding a fluorocarbon surfactant and allowing it to participate in the reaction during the preparation of silica nanoparticles by a conventional sol method. Background technique [0002] At present, when superhydrophilic silica sol system is prepared in the market, it is often realized by post-adding fluorocarbon surfactant. That is, the ordinary silica sol system is prepared first, and then a fluorocarbon surfactant is added to it. Such a post-addition method often brings two major problems: one is that the silica sol system relies on the charge repulsion on the surface of the silica particles to achieve system stability, so the direct addition of fluorocarbon surfactants tends to be extremely difficult. It greatly affects the stability of the system, and eventually leads to the destruction of the sol system and precipitation; the second is that the post-additi...

AI Technical Summary

Problems solved by technology

Such a post-addition method often brings two major problems: one is that the silica sol system relies on the charge repulsion on the surface of the silica particles to achieve system stability, so the direct addition of fluorocarbon surfactants tends to be extremely difficult. It greatly affects the stability of the system, and eventually leads to the destruction of the sol system and precipitation; the second is that the post-addition method is not conducive to the stability of the fluorocarbon surfactant, and it is easy to lose

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