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Method for producing high-dispersing multi-group amphiphilic nano silicon oxide powder or dispersion

A technology of nano-silica and production method, which is applied in the field of synthesis and dispersion of nano-materials, which can solve the problems of difficult dispersion of nano-silica, achieve the effects of reduced particle agglomeration, stable performance, and difficult dispersion

Inactive Publication Date: 2010-03-03
SHANDONG HINA HI TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface modification of the prepared silica powder still cannot fundamentally solve the problem of difficulty in the use and dispersion of nano-silica

Method used

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  • Method for producing high-dispersing multi-group amphiphilic nano silicon oxide powder or dispersion
  • Method for producing high-dispersing multi-group amphiphilic nano silicon oxide powder or dispersion
  • Method for producing high-dispersing multi-group amphiphilic nano silicon oxide powder or dispersion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Preparation of highly dispersed multi-group amphiphilic nano-silica powder

[0029] (1). Refining of water glass

[0030] The invention adopts the water glass solution after removing impurities as the silicon source.

[0031] First, dilute the water glass in deionized water in a ratio of 1:1 (weight ratio), heat up to 40°C, add 0.5% hydrogen peroxide accounting for the total weight of the water glass dilution, stir for 10 minutes, filter, and remove the water glass. metal ions and impurities to prepare water glass base liquid;

[0032] (2). Preparation process of nano-silica powder

[0033] The main preparation steps are as follows:

[0034] ① Add the refined water glass base liquid into the reaction kettle, add silane coupling agent according to 4% (3-5% of the weight of the water glass base liquid) of the water glass base liquid, stir; heat up to 40°C. Silane coupling agent According to the required organic groups, you can choose 1 or 2 types from the f...

Embodiment 2

[0040] Embodiment 2: Preparation of highly dispersed multi-group amphiphilic nano-silica dispersion

[0041] (1). In a container equipped with a mechanical shearing device, add deionized water and the nano-silica powder prepared in Example 1 according to a ratio of solid content of 20% (10% to 30%).

[0042] (2). Start the mechanical shearing, raise the temperature to 40°C, and at a constant temperature, select 2 to 3 kinds of dispersants and 1 kind of stabilizer, each accounting for 3 to 5% of the mass of the nano-silica powder, and add them to the system to disperse for 30 minutes . The dispersant is selected from: sodium polycarboxylate, sodium polyacrylate, sodium metaphosphate, polyethylene glycol, polyvinyl alcohol, and the stabilizer is: isopropyl trimethacryloyl titanate, alcohol amine titanate or poly Butyl titanate.

[0043] (3). After the material is dispersed, enter the grinder and grind for 30 minutes;

[0044] (4). Ultrasonic dispersion was carried out for 50 ...

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Abstract

The invention provides a method for producing high-dispersing multi-group amphiphilic nano silicon oxide powder or dispersion, which comprises: firstly, refining sodium silicate serving as a raw material by adding hydrogen peroxide; adding a surfactant in the refined sodium silicate serving as the raw material, controlling the formation and growth of particles by segmental acid addition precipitation; and at the same time, performing in-situ modification by replacing hydroxyl on the surfaces of the silicon dioxide particles with organic groups. In the process, the temperature and the pH valueare controlled first, and then the high-dispersing silicon dioxide powder is prepared by filtration, washing, vacuum filtration and drying. And the dispersing time is controlled by a combined dispersing technology of mechanical dispersion, grinding and ultrasound waves and by adding a combined dispersant and a stabilizer to further disperse in situ modified powder to prepare a nano dispersion. Thedispersion is stable in performance and good in dispersion effect and keeps the dispersion state of nano particles.

Description

technical field [0001] The invention belongs to the technical field of synthesis of nanomaterials and dispersion of nanomaterials, and in particular relates to a production method of highly dispersed multi-group amphiphilic nano-silica powder or dispersion liquid. Background technique [0002] Among the methods for wet production of nano-silica, the chemical direct synthesis method (also known as the improved precipitation method) invented by Chengdu Lianyu Technology Co., Ltd. is a relatively mature method (patent application number 200310123470.9). In the production of this method, diluting water and auxiliary agents are added to sodium silicate in advance, and the impurities in it are removed by using the flocculation ability of sodium silicate. The purity of the product is not less than 99.9%. During the reaction, the surface treatment is carried out by feeding in stages to control the formation and growth of silica particles, destroy the interaction of hydroxyl groups o...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 王海平董振民杨若峰于新生
Owner SHANDONG HINA HI TECH MATERIAL
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