A kind of aluminum modified acidic silica sol and its preparation method and application

A technology for modification of acidic silica sol and aluminum, which is applied in the field of silicon materials, can solve the problems of insignificant improvement of the purity of acidic silica sol and limited degree of improvement, and achieve increased specific surface area, enhanced functional performance, and improved modification degree Effect

Active Publication Date: 2021-03-30
GUANGDONG WELL SILICASOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Though above-mentioned prior art has improved the stability of acidic silica sol to a certain extent, but degree of improvement is limited, and is not remarkable on the raising of acidic silica sol purity, therefore, develops a kind of new preparation method of acidic silica sol, It is very meaningful to significantly improve the stability and purity of acidic silica sol

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  • A kind of aluminum modified acidic silica sol and its preparation method and application
  • A kind of aluminum modified acidic silica sol and its preparation method and application
  • A kind of aluminum modified acidic silica sol and its preparation method and application

Examples

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Embodiment 1

[0052] This embodiment provides an aluminum-modified acidic silica sol, the preparation method of which is:

[0053] (1) dissolving aluminum sulfate in water to make a mass fraction of 5% aluminum sulfate aqueous solution;

[0054] (2) Add the aqueous aluminum sulfate solution obtained in step (1) dropwise at a rate of 50 mL / min into the freshly prepared 3Be active silicic acid solution (obtained by exchanging water glass with a strong-acid cationic resin activated by sulfuric acid), so that the aluminum The salt is dispersed in a silicic acid solution, and a silicic acid solution having a molar ratio of aluminum atoms to silicon atoms of 0.004:1 is prepared;

[0055] (3) Add the aluminum-containing silicic acid solution and the alkaline stabilizer (4% aqueous sodium hydroxide solution) obtained in step (2) dropwise into the alkaline bottom solution (sodium hydroxide solution at pH=12) (containing The volume ratio of the aluminosilicate solution, the alkaline stabilizer, and ...

Embodiment 2

[0059] This embodiment provides an aluminum-modified acidic silica sol, the preparation method of which is:

[0060] (1) dissolving aluminum nitrate in water to make massfraction is 3% aluminum nitrate aqueous solution;

[0061] (2) Add the aluminum nitrate aqueous solution obtained in step (1) dropwise into the freshly prepared 2Be active silicic acid solution (obtained by exchanging water glass with a strong-acid cationic resin activated by sulfuric acid) at a rate of 40mL / min, so that the aluminum The salt is dispersed in a silicic acid solution, and a silicic acid solution having a molar ratio of aluminum atoms to silicon atoms of 0.002:1 is prepared;

[0062] (3) Add the aluminum-containing silicic acid solution and the alkaline stabilizer (2% aqueous sodium hydroxide solution) obtained in step (2) dropwise into the alkaline bottom solution (sodium hydroxide solution at pH=9) (containing The volume ratio of the aluminosilicate solution, the alkaline stabilizer and the al...

Embodiment 3

[0066] This embodiment provides an aluminum-modified acidic silica sol, the preparation method of which is:

[0067] (1) dissolving alum in water to make massfraction is 7% alum aqueous solution;

[0068] (2) Add the alum aqueous solution obtained in step (1) dropwise into the freshly prepared 4.5Be active silicic acid solution (obtained by exchanging water glass with a strong acid cationic resin activated by sulfuric acid) at a rate of 60mL / min to make aluminum The salt is dispersed in a silicic acid solution, and a silicic acid solution having a molar ratio of aluminum atoms to silicon atoms of 0.006:1 is prepared;

[0069] (3) Add the aluminum-containing silicic acid solution and alkaline stabilizer (6% aqueous sodium hydroxide solution) obtained in step (2) dropwise into the alkaline bottom solution (sodium hydroxide solution at pH=14) (containing The volume ratio of the aluminosilicate solution, the alkaline stabilizer and the alkaline base solution is 10:0.3:5), the tem...

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Abstract

The invention relates to aluminum modified acidic silica sol as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing an aluminum-containing silicic acid solution with an alkaline base solution to react to obtain aluminum modified alkaline silica sol, and reacting the aluminum modified alkaline silica sol with cation exchange resin to obtain the aluminum modified acidic silica sol. The acidic silica sol prepared by the preparation method disclosed by the invention is low in metal ion concentration, namely high in purity and good in stability, has a larger specific surface area than the traditional silica sol, and is wider in application field.

Description

technical field [0001] The invention belongs to the technical field of silicon materials, and in particular relates to an aluminum-modified acidic silica sol and its preparation method and application. Background technique [0002] Silica sol refers to a stable dispersion system with mutually discrete amorphous silica colloidal particles as the dispersed phase, and is a nanomaterial with excellent performance. Silica sol is a network structure formed by countless micelles. It has a large specific surface area, uniform particle size distribution and abundant surface silanol groups, so it shows high chemical activity. The colloidal particles of silica sol can The interaction occurs syneresis and reticulation, and it can also interact with the surface of many objects to form an inorganic silicon film, which is widely used in many industrial fields. [0003] Silica sol can be divided into alkaline silica sol and acidic silica sol according to the pH value range. Because the al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/146
CPCC01B33/146
Inventor 王国顺皮艳叶海峰林厦涛
Owner GUANGDONG WELL SILICASOL
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