Method for preparing silicon dioxide with large pore volume and large aperture

A silicon dioxide and large pore size technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of difficult control of pore size and its distribution, unstable powder properties, etc., and achieve improved sedimentation stability, low cost, and simple process Effect

Inactive Publication Date: 2008-01-30
BEIJING UNIV OF CHEM TECH
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AI Technical Summary

Problems solved by technology

The large pore volume silica prepared by precipitation method has unstable powder properties, and its pore size and distribution are not easy to control

Method used

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  • Method for preparing silicon dioxide with large pore volume and large aperture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: In 10 liters of reactors with agitator, add diluted 2000mLSiO 2 Concentration is 6% industrial water glass solution and 33g content is the polyethylene glycol-200 of 29%, is heated to initial temperature 50 ℃, with 0.5mol / lH 2 SO 4 Adjust the pH value to 10.8, stir for 1 h after the gel appears, and then continue to add H 2 SO 4 Until the pH is 3, the temperature is raised to 85° C., and after aging for 4 hours, vacuum filtration is carried out, and water is washed twice, the filter cake is beaten for spray drying, and the product is obtained after jet crushing.

Embodiment 2

[0024] Example 2: Silica was prepared by the method described in Example 1, the difference from Example 1 was that the initial temperature was 85°C.

Embodiment 3

[0025] Example 3: Silica was prepared according to the method described in Example 1, except that the initial temperature was 85° C., and the molecular weight of polyethylene glycol was 400.

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PUM

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Abstract

The invention relates to a preparation method of large pore volume and large pore diameter silica. With industrial water glass as silica source, water soluble polymer and surfactant as hydrophobic agent and hole forming template, by controlling reaction conditions such as temperature, hydrophobic agent, final ph value, etc., the large pore volume silica products are produced; the pore diameter is narrowly distributed, the pore volume is between 2-2.5cm3/g and the average pore diameter is between 18-35 nm. Especially, the more optimal three-step heating regulation is more beneficial to the stability of hole forming and hole structure and that the distribution of pore diameter reaches between 25-35nm is more proper to be used as flatting agent.

Description

technical field [0001] The invention relates to a method for preparing silicon dioxide with large pore volume by a sol-gel method, in particular to a method for preparing silicon dioxide with large pore volume and large pore diameter for matting agents. Background technique [0002] Macroporous silica is an important inorganic chemical raw material, which can be used as a matting agent for paints and coatings, an anti-adhesive agent for food, a thickener, a stabilizer, an adsorption desiccant for flavors and fragrances, and a clarification filter aid, etc. . When large-volume silica is used as a matting agent, the pore volume, pore size and distribution have a great influence on its matting performance, and too small or too large a pore size will not have a matting effect. At present, the preparation methods of large-volume silica mainly include gas-phase method and liquid-phase method, and the preparation of large-pore-volume silica by gas-phase method is gradually replace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 毋伟沈淑玲陈建峰郭锴
Owner BEIJING UNIV OF CHEM TECH
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