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A kind of hollow porous silica microsphere, preparation method and application

A technology of porous silica and microspheres, applied in silica, silica and other directions, can solve the problems of inability to regulate the hydrophilicity and hydrophobicity of silica microspheres, and achieve good spherical shell integrity, high yield, Sphere complete effect

Active Publication Date: 2022-04-12
杭州纳硅微球科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the problem that the shell layer of the hollow silica microspheres in the prior art only contains mesoporous voids, its size is only at the nanometer level, and the lack of hydrophilicity and hydrophobicity of the silica microspheres cannot be regulated. , thereby providing a kind of hollow porous silica microsphere, preparation method and application

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  • A kind of hollow porous silica microsphere, preparation method and application
  • A kind of hollow porous silica microsphere, preparation method and application
  • A kind of hollow porous silica microsphere, preparation method and application

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Embodiment 1

[0038] The present embodiment provides a kind of preparation method of hydrophilic hollow porous silica microspheres, comprising the following steps:

[0039] S1: Add methyltriethoxysilane (65 grams) to a mixed solution of ethyl orthosilicate (152 grams) and polyethylene glycol (9.4 grams) stirred at a low speed (200 rpm) and mix Evenly, add 20 grams of ethanol to the mixed solution to disperse until transparent; then slowly drop 25 g of hydrochloric acid solution with a concentration of 4.1mol / L, after the addition is completed, heat up to 80°C, and continue to stir for 4 hours. The ethanol in the system is quickly distilled off under reduced pressure to obtain a turbid prepolymer solution with a certain viscosity;

[0040] S2: Under stirring conditions (stirring speed is 500 rpm), 20 grams of the above-mentioned prepolymer solution is added dropwise to 200 grams of distilled water to form an emulsion;

[0041]S3: After the addition of the prepolymer solution is completed, a...

Embodiment 2

[0046] The present embodiment provides a kind of preparation method of hydrophobic hollow porous silica microsphere, comprises the following steps:

[0047] S1: Add r-aminopropyltriethoxysilane (84.7 grams) to methyl orthosilicate (154 grams) and polyethylene glycol (8.2 grams) stirred at low speed (200 rpm). Mix evenly in the mixed solution, then add 30 grams of isopropanol to the mixed solution to disperse until transparent; then slowly add 32 g of sulfuric acid solution with a concentration of 2 mol / L, and after the addition is completed, heat up to 80°C and continue Stir the reaction for 4 hours, quickly distill off the isopropanol in the system under reduced pressure, and obtain a turbid prepolymer solution with a certain viscosity;

[0048] S2: Under stirring conditions (stirring speed is 500 rpm), 20 grams of the above-mentioned prepolymer solution is added dropwise to 200 grams of distilled water to form an emulsion;

[0049] S3: After the dropwise addition of the pre...

Embodiment 3

[0054] The present embodiment provides a kind of preparation method of hydrophilic hollow porous silica microspheres, comprising the following steps:

[0055] S1: Add vinyltrimethoxysilane (45.3 grams) to a mixed solution of isopropyl orthosilicate (151 grams) and polyethylene glycol (1.51 grams) stirred at a low speed (200 rpm) and mix Evenly, add 30 grams of butanol to the mixed solution to disperse until transparent; then slowly drop 7.5 g of hydrochloric acid solution with a concentration of 5.5 mol / L. Hours, the film evaporates the butanol in the system to obtain a turbid prepolymer solution with a certain viscosity;

[0056] S2: Under stirring conditions (stirring speed is 200 rpm), 20 grams of the above-mentioned prepolymer solution is added dropwise to 100 grams of distilled water to form an emulsion;

[0057] S3: After the dropwise addition of the prepolymer solution is completed, formic acid is added to make the pH of the emulsion reach 4, and the stirring reaction ...

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Abstract

The application relates to a hollow porous silica microsphere, its preparation method and application. The preparation method is: dispersing a silane compound containing a hydrophobic group in a mixed solution of a tetraalkoxysilane and a hydrophilic polymer containing a hydroxyl group , add an organic solvent to disperse until the solution is transparent, add an acidic medium, heat the reaction, and obtain a prepolymer solution; For hydrolysis and condensation reaction, the reacted emulsion is left to stand, filtered, and the precipitate is washed, heated and dried to obtain hollow porous silica microspheres. The silica microspheres of the present invention have middle macropores in the core, and through the addition of hydroxyl-containing hydrophilic polymers, the shell layer is a honeycomb-shaped structure containing micropores, mesopores and macropores surrounding the middle macropores in the core. The structure and the outer mesoporous shell, and its hydrophilicity and hydrophobicity are controllable, can be used as a heat insulation material, a carrier for active substance coating and slow release, an adsorption material, and an insulating material.

Description

technical field [0001] The application belongs to the technical field of silica microsphere preparation technology, and in particular relates to a hollow porous silica microsphere, a preparation method and an application. Background technique [0002] Hollow porous silica is a special structural material with a permeable silicon shell structure and a huge inner cavity in the shell. Hollow porous silica microspheres have large internal space, good stability, large specific surface area, and large size. It has broad application prospects in the fields of catalysis, adsorption and separation, drug loading and controlled release, nanofabrication and other fields. According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), porous materials can be divided into microporous (pore diameter <2nm), mesoporous (pore diameter 2-50nm), macroporous (pore diameter 50nm-1μm) materials according to the size of the pores. . [0003] At present, the synthe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2004/03C01P2004/04C01P2004/34C01P2004/61
Inventor 徐永全郭兴忠洪露英
Owner 杭州纳硅微球科技有限公司