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A kind of preparation method of aluminum modified silica sol

A technology of silica sol and aluminum modification, which is applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., and can solve problems such as low efficiency

Active Publication Date: 2016-07-27
GUANGDONG WELL SILICASOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this method is that metal aluminum salt can not carry out the exchange of aluminum ion and hydrogen ion effectively with hydrogen type cation ion exchange resin on the one hand, and the exchange of aluminum ion and silica sol sodium ion in the final aluminum ion type cation exchange resin is also also There is also the problem of low efficiency

Method used

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  • A kind of preparation method of aluminum modified silica sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 2.00g NaOH, add to 550mLH with stirring 2 Heat to dissolve in O, continue to heat up to 90-100°C, then add a mixture of 28.00g Si powder and 0.10g Al powder, react for 5-8 hours, cool to room temperature, and filter to obtain 500g milky white sol. The aluminum modified silica sol SiO 2 The content is 12.00%, the pH value is 10.58, and the aluminum content is 200ppm.

Embodiment 2

[0023] Take 3.00g NaOH, add to 550mLH with stirring 2 Heat to dissolve in O, continue to heat up to 90-100°C, then add a mixture of 28.00g Si powder and 0.10g Al powder, react for 5-8 hours, cool to room temperature, filter and concentrate under reduced pressure to obtain 120g milky white sol, the aluminum modified Silica sol SiO 2 The content is 50.00%, the pH value is 10.65, and the aluminum content is 833ppm.

Embodiment 3

[0025] Take 3.00g NaOH, add to 550mLH with stirring 2 Heat to dissolve in O, continue to heat up to 90-100°C, then add a mixture of 28.00g Si powder and 0.10g Al powder, react for 5-8 hours, cool to room temperature, filter and concentrate under reduced pressure to obtain 240g off-white transparent sol, the aluminum Modified silica sol SiO 2 The content is 25.00%, the pH value is 10.68, and the aluminum content is 416ppm.

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Abstract

The invention discloses a preparation method of an aluminum modified silica sol, wherein the preparation method comprises the steps: taking NaOH, adding into water under stirring, heating, dissolving, continuing to heat up to 90-100 DEG C, then adding a mixture of an Si powder and an Al powder, carrying out a reaction for 5-8 h, cooling to room temperature, and filtering to obtain the clear-transparent or milky-white sol. The method for doping a small amount of the Al powder into the Si powder is selected, and the aluminum modified silica sol is synthesized by a metal elemental dissolution method in one step. The Al powder and the Si powder are both relatively cheap and easily available materials, through the reaction of the Si powder and the Al powder with sodium hydroxide to generate the product, the Al addition amount is controlled, and the aluminum modified silica sol with different modification degrees can be obtained. Al in the aluminum modified silica sol can play a role during a colloid particle formation process, can be bonded to a siloxane bond (-Si-O-Si-) structure, and can fully and effectively participate in formation of a silica sol adsorption layer even a colloidal nucleus; and the Al modified degree can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of fine inorganic polymer chemical industry, in particular to a preparation method of aluminum-modified silica sol. Background technique [0002] Silica sol, also known as silicic acid aqueous solution, is a colloidal solution formed by uniform dispersion of silica colloidal particles in water. The particle diameter is generally between 8-200nm, and the appearance is milky white or translucent colloidal liquid. acidic. As an inorganic polymer material with excellent performance, silica sol is widely used in chemical industry, precision casting, textile, papermaking, paint, food, electronics, mineral processing and other fields. [0003] Although ordinary silica sol has many excellent properties and is widely used, with the continuous deepening of research and application of silica sol, silica sol with a single composition and structure can no longer meet the applications in some special fields, and modified...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/18B22C9/04
CPCB22C1/186B22C9/04
Inventor 杨训成陈连喜范渊卿
Owner GUANGDONG WELL SILICASOL
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