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A kind of homogeneous silica microsphere and its preparation method and application

A silicon dioxide and microsphere technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of environmental pollution, complicated operation steps, difficult process control and so on.

Active Publication Date: 2020-08-04
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operation steps of this method are cumbersome, there are many influencing factors, and the process is not easy to control.
[0006] The formation process of uniform silica microspheres is very sensitive to changes in conditions. The mechanism of uniform particle formation has not yet been fully understood. How to more effectively control the particle size of silica microspheres to achieve batch production scale is still a problem
In addition, the preparation of uniform silica microspheres by the sol-gel method generally uses alcohol as a solvent, which has high preparation costs and is likely to cause environmental pollution.

Method used

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  • A kind of homogeneous silica microsphere and its preparation method and application
  • A kind of homogeneous silica microsphere and its preparation method and application
  • A kind of homogeneous silica microsphere and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1: to above-mentioned TEOS / (CH 3 ) 2 CHOH-H 2 Add mass fraction 28% ammonia solution to O mixed solution, make the concentration of ammonia in the whole reaction system reach 0.5mol / L, after stirring (rotating speed 200rmp) under the condition of reaction 3h, reaction system becomes milky white from clear and transparent, obtains Silica sol. The silica sol was centrifuged at room temperature 20°C (5000rmp, 20min), washed with ethanol three times, and uniform silica microspheres with an average particle diameter of 223nm were obtained.

Embodiment 2

[0068] Embodiment 2: to above-mentioned TEOS / (CH 3 ) 2 CHOH-H 2 Add mass fraction 28% ammonia solution in the O mixed solution, make the concentration of ammonia in the whole reaction system reach 2.0mol / L, after stirring (rotating speed 200rmp) under the condition of reaction 2h, reaction system becomes milky white from clear and transparent, obtains Silica sol. The silica sol was centrifuged at room temperature 20°C (5000rmp, 20min), washed with ethanol for 3 times, and uniform silica microspheres with an average particle diameter of 278nm were obtained.

Embodiment 3

[0069] Embodiment 3: to above-mentioned TEOS / (CH 3 ) 2 CHOH-H 2 Add mass fraction 28% ammonia solution to O mixed solution, make the concentration of ammonia in the whole reaction system reach 5.0mol / L, after stirring (rotating speed 200rmp) under the condition of reaction 1h, reaction system becomes milky white from clear and transparent, obtains Silica sol. The silica sol was centrifuged at room temperature 20°C (5000rmp, 20min), washed with ethanol for 3 times, and uniform silica microspheres with an average particle diameter of 354nm were obtained.

[0070] Table 1 Effect of different concentrations of catalysts on silica microspheres

[0071]

[0072] From the experimental results obtained in Examples 1 to 3 listed in Table 1, it can be seen that by adopting the embodiment proposed by the present invention, only by changing the concentration and reaction time of the catalyst, silica microspheres with different particle sizes and uniform particle sizes can be prepare...

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Abstract

Provided are a uniform silica microsphere, a preparation method therefor, and an application thereof. The method comprises the following steps: (1) mixing an organosilicon compound and an aqueous medium according to a certain ratio to obtain an organosilicon compound / H2O emulsion; (2) adding a small molecule alcohol or mixed small-molecule alcohol solution to the organosilicon compound / H2O emulsion of step (1), to obtain a transparent organosilicon compound / alcohol-H2O mixture; (3) adding a catalyst to the organosilicon compound / alcohol-H2O mixture of step (2) to conduct a hydrolytic polycondensation reaction, turning the transparent organosilicon compound / alcohol-H2O mixture into a milky-white silica sol; and (4) subjecting the silica sol of step (3) to centrifugal separation to obtain the uniform silica microspheres. The method uses an aqueous medium as a solvent, and features a simple and controllable process, mild conditions, a uniform and controllable particle size, and large batches of reaction, and can overcome various disadvantages in the prior art and has wide application prospects.

Description

technical field [0001] The invention relates to a uniform silica microsphere and a preparation method thereof, in particular to a green, batch silica microsphere and a preparation method thereof, and belongs to the technical field of chemistry and inorganic materials. Background technique [0002] Silica microspheres are non-toxic, odorless non-metallic materials, and have broad application prospects in the fields of papermaking, plastics, coatings, pigments, rubber, ceramics, adhesives, cosmetics, catalyst carriers, and antibacterial materials. [0003] There are many methods for preparing silica microspheres, among which the sol-gel method is one of the commonly used methods for preparing silica microspheres. The method uses inorganic salt or metal alkoxide as a precursor, gradually gels through hydrolysis and polycondensation, and then undergoes post-treatment (aging, drying) to obtain the desired material. The sol-gel method has the advantages of mild reaction condition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2002/80C01P2004/03C01P2004/32C01P2004/62
Inventor 马士禹
Owner EAST CHINA NORMAL UNIV