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A kind of highly stable silica sol and preparation method thereof

A silica sol, high stability technology, applied in the field of nanomaterials, can solve the problems of heavy metal pollution, high cost of metal modifiers, etc., and achieve the effect of low cost

Active Publication Date: 2018-08-28
强新正品(苏州)环保材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic modifiers are mainly silane coupling agents, but silane coupling agents will undergo severe hydrolysis and condensation reactions in water, resulting in gel formation; metal modifiers are commonly used aluminum, tin, zinc and lead, but metal modifiers The cost of neutralizing agents is higher, and in addition, it will cause problems such as heavy metal pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing highly stable silica sol, comprising the following steps:

[0023] S01, preparing a humic acid solution, and then performing acid-base adjustment to make its pH 4;

[0024] S02, adding the humic acid solution obtained in S01 dropwise into the silica sol solution and stirring to form a humic acid / silica sol mixed system;

[0025] S03, filter the humic acid / silica sol mixed system obtained in S02, wash with absolute ethanol, and finally re-disperse the filtered mixture with water to prepare highly stable silica sol.

[0026] The concentration of the silica sol solution is 30wt%.

[0027] The humic acid is extracted from soil organic matter or water body organic matter.

[0028] The acid for the acid-base adjustment includes dilute hydrochloric acid or dilute nitric acid, and the base for the acid-base adjustment includes sodium hydroxide.

[0029] The concentration of the humic acid is 1000mg / L.

[0030] S02 also includes any one or more of the ...

Embodiment 2

[0036] A method for preparing highly stable silica sol, comprising the following steps:

[0037] S01, preparing a humic acid solution, and then performing acid-base adjustment to make its pH 6;

[0038] S02, adding the humic acid solution obtained in S01 dropwise into the silica sol solution and stirring to form a humic acid / silica sol mixed system;

[0039] S03, filter the humic acid / silica sol mixed system obtained in S02, wash with absolute ethanol, and finally re-disperse the filtered mixture with water to prepare highly stable silica sol.

[0040] The concentration of the silica sol solution is 40wt%.

[0041] The humic acid is extracted from soil organic matter or water body organic matter.

[0042] The acid for the acid-base adjustment includes dilute hydrochloric acid or dilute nitric acid, and the base for the acid-base adjustment includes sodium hydroxide.

[0043] The concentration of the humic acid is 2000mg / L.

[0044] S02 also includes any one or more of the ...

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PUM

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Abstract

The invention discloses a preparation method of a high stable silica sol. The preparation method comprises following steps: S01, a humic acid solution is prepared, and pH value is adjusted to 4 to 6; S02, the humic acid solution is added into a silica sol solution dropwise for stirring mixing so as to obtain a humic acid / silica sol mixed system; and S03, the humic acid / silica sol mixed system is filtered, and washed with absolute ethyl alcohol, and at last a mixture obtained via filtering is dispersed in water so as to obtain the high stable silica sol. According to the high stable silica sol, SiO2 particles are dispersed in a polymer emulsion uniformly, product cost is reduced, and the preparation method is friendly to the environment.

Description

technical field [0001] The invention relates to a highly stable silica sol and a preparation method thereof, in particular to a modified silica sol and a preparation method thereof, and belongs to the technical field of nanometer materials. Background technique [0002] Silica sol is a dispersion of nano-scale silica particles in water or solvents. It has the characteristics of large specific surface area, high temperature resistance, and oxidation resistance. It is an ideal polymer emulsion enhancer. [0003] strong material. Due to the nano-SiO in silica sol 2 There are a large number of hydroxyl groups on the surface of the particles, which need to be hydrophobically modified to make SiO 2 The particles can be uniformly dispersed in the polymer emulsion. So far, the main modifiers mainly include organic modifiers and metal modifiers. Organic modifiers are mainly silane coupling agents, but silane coupling agents will undergo severe hydrolysis and condensation reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/141
CPCC01B33/141
Inventor 闫森源
Owner 强新正品(苏州)环保材料科技有限公司