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Method for preparing stable silica sol

A silica sol and stable technology, applied in the field of preparation of stable silica sol, can solve the problem of not mentioning the preparation process, etc., and achieve the effect of improving stability

Inactive Publication Date: 2005-07-27
章浩龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two documents have introductions of foreign silica sol varieties, which introduce the American DuPont Ludox silica sol AS-40 and AS-30 varieties as NH 3 Silica sol as a stabilizer, but there is no mention of the corresponding preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Get a kind of alkaline silica sol 1000g, its silicon dioxide content is 10%, and sodium oxide content is 0.3%, and pH value is 8.5, and colloid particle size is 8 nanometers, makes it pass through the ultrafilter with circulation device, while Add deionized water while circulating dehydration, keep the silicon dioxide content at about 10%, detect that the sodium oxide content is 0.1%, no longer replenish water, continue to circulate and concentrate until the silicon dioxide content is 20%, and discharge while stirring Slowly pass into NH 3 Gas to a pH value of 8.8 to obtain a stable silica sol, the silicon dioxide content is 20%, the sodium oxide content is 0.09%, the pH value is 8.8, and the colloidal particle size is 8 nanometers.

Embodiment 2

[0012] Get a kind of alkaline silica sol 1000g, its silicon dioxide content is 20%, sodium oxide content is 0.35%, pH value is 9.0, colloid particle size is 10 nanometers, add while stirring and treat with 5% hydrochloric acid and use Wash 500g of 001×7 ion exchange resin with deionized water, continue to stir for about 1 hour, filter to obtain about 950g of filtrate, and its pH value is 3.3, slowly add NH 3 25% ammonia water to a pH value of 8.5 to obtain a stable silica sol, the silicon dioxide content is 19.8%, the sodium oxide content is 0.05%, the pH value is 8.5, and the colloidal particle size is 10 nanometers.

Embodiment 3

[0014] Get a kind of alkaline silica sol 1000g, its silicon dioxide content is 25%, sodium oxide content is 0.4%, pH value is 9.5, and colloidal particle size is 12 nanometers, makes it through with 5% hydrochloric acid treatment and has used The U-shaped ion exchange column of 001×7 ion exchange resin washed with deionized water, about 950g of silica sol can be obtained from the outlet of the exchange column, and its pH value is 2.5, and NH is slowly introduced while stirring 3 Gas until the pH value is 9.0 to obtain a stable silica sol, the silicon dioxide content is 25%, the sodium oxide content is 0.04%, the pH value is 9.0, and the colloidal particle size is 12 nanometers.

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Abstract

Production of stable silica sol is carried out by taking basic sodium silica sol as material, removing sodium ion and adding ammonia or ammonia water to 8.5-9.5 to obtain stable silica sol. The content of silica is 10-35%, the content of sodium oxide is 0.3-0.5%, pH value is 8.5-10.5 particle size of colloidal particle is 8-20 nanometer. The hydrogen-state ion exchange resin or super-filter membrane technology is carried out by removing most Na+ in basic silica sol, decreasing sodium oxide content in silica sol, and adding ammonia. It achieves higher potential and stability.

Description

technical field [0001] The invention relates to a preparation method of silica sol, in particular to a preparation method of stable silica sol. Background technique [0002] Silica sol is a colloidal solution of silica in water, and its colloidal particle size is 1-100nm. The most widely used in industry is silica sol with a particle size of 8-20nm. Silica sol can be widely used in architectural coatings, precision casting, catalyst carriers, refractory materials and other industries. The main methods for preparing silica sol include ion exchange method, elemental silicon dissolution method and electrodialysis method. [0003] At present, the main varieties of silica sol in China are alkaline sodium silica sol and acid silica sol. For example, page 40 of the second volume of "Inorganic Salt Industry Handbook" published by Chemical Industry Press in January 1996 quoted the industry standard of the Ministry of Chemical Industry, introducing 4 kinds of alkaline sodium silica ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/14
Inventor 章浩龙
Owner 章浩龙
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