Preparation method of silicon dioxide microspheres

A technology of silica and microspheres, which is applied in the direction of silica and silicon oxide, can solve the problems of difficult control of particle size and wide particle size distribution of microspheres, and achieve uniformity of particle size and controllability of particle size High, easily absorbed effect

Inactive Publication Date: 2019-11-22
无锡迈科为生物科技有限公司
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Problems solved by technology

[0003] Usually, the synthesis of silica microspheres and porous silica microspheres often uses spray drying method, sol-gel method, etc., but the particle size distribution of the microspheres obtained by this method is wide, and the particle size is not easy to control

Method used

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  • Preparation method of silicon dioxide microspheres
  • Preparation method of silicon dioxide microspheres
  • Preparation method of silicon dioxide microspheres

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preparation example Construction

[0032] The embodiment of the present invention provides a method for preparing silica microspheres. The method for preparing silica composite microspheres includes:

[0033] Adding polymer seeds to an alcoholic solution containing stabilizers and catalysts to form a homogeneously dispersed seed suspension;

[0034] Adding the silicon dioxide precursor to the alcohol solution and stirring to form a precursor solution;

[0035] The precursor solution is dispersed into the seed suspension in the form of droplets through the nozzle;

[0036] Heating and reacting to obtain silica composite microspheres after separation.

[0037] Further, the silica composite microspheres are calcined at a preset temperature to form porous silica microspheres. The preset temperature is 500-800°C. After the polymer seeds in the silica composite microspheres are decomposed, porous silica microspheres can be produced.

[0038] The porous silica microspheres obtained in the embodiment of the present...

Embodiment 1

[0057] Prepare the seed suspension in the first container: 62 g of styrene-divinylbenzene seeds (its particle size is 2 μm, CV=3%) prepared by emulsion polymerization are added to a tank containing 1.5 g of hydroxymethylcellulose and 300 g of ammonia In the ethanol solution, the ethanol solution is an aqueous ethanol solution with a volume fraction of 75%, and the content of the ethanol solution is 150 g, and a uniformly dispersed seed suspension is formed after uniform stirring.

[0058] The precursor solution was prepared in the second container, wherein a nozzle was installed on the second container, and the hole diameter of the nozzle was 20 μm. Specifically, 165 g of ethyl orthosilicate was added to 200 g of ethanol solution, and stirred evenly to form a precursor solution.

[0059] Apply a preset pressure of 0.35MPa to the second container, maintain a temperature environment of 35°C, disperse the precursor solution into the seed suspension within 10 minutes in the form o...

Embodiment 2

[0063] Preparation of seed suspension in a first container: 620 g of styrene-divinylbenzene seeds (4.6 microns in particle size, CV=3%) prepared by emulsion polymerization were added to a container containing 9.5 g of hydroxymethylcellulose and 3000 g of ammonia In the ethanol solution, the ethanol solution is an aqueous ethanol solution with a volume fraction of 75%, and the content of the ethanol solution is 1450 g, and a uniformly dispersed seed suspension is formed after uniform stirring.

[0064] The precursor solution was prepared in the second container, wherein a nozzle was installed on the second container, and the hole diameter of the nozzle was 50 μm. Specifically, 1590 g of ethyl orthosilicate was added into 1100 g of ethanol solution, and stirred evenly to form a precursor solution.

[0065] Apply a preset pressure of 1.35MPa to the second container, maintain a temperature environment of 45°C, disperse the precursor solution into the seed suspension within 15 minu...

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Abstract

The invention discloses a preparation method of silicon dioxide microspheres, which comprises the following steps: adding polymer seeds into an alcoholic solution containing a stabilizer and a catalyst to form a uniformly dispersed seed suspension; adding a silicon dioxide precursor into the alcoholic solution, and stirring the mixture to form a precursor solution; dispersing the precursor solution into the seed suspension in a liquid droplet manner through a nozzle; allowing the seeds to absorb the liquid droplets and grow and polymerize to obtain silicon dioxide composite microspheres; and further calcining the silicon dioxide composite microspheres to obtain the porous silicon dioxide microspheres. The porous silicon dioxide microsphere prepared by the method is uniform and controllablein particle size, and has potential application in the fields of biology and catalysts.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a preparation method of silica microspheres. Background technique [0002] Silica microspheres have unique electrical properties, optical properties, catalytic properties and mechanical properties, and their applications are becoming more and more extensive. Especially porous silica microspheres, porous silica microspheres have a large specific surface area, and are widely used in liquid chromatography stationary phases, high-efficiency catalyst supports, polymer material enhancers, adsorbents, matting agents, etc. . [0003] Usually, the synthesis of silica microspheres and porous silica microspheres often uses spray drying method, sol-gel method, etc., but the particle size distribution of the microspheres obtained by this method is wide, and the particle size is not easy to control. Contents of the invention [0004] In order to solve the above technical problems, the embodime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2004/62C01P2004/61C01P2004/60C01P2004/03
Inventor 阳承利
Owner 无锡迈科为生物科技有限公司
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