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Polyalkoxy-containing silicon-based benzene compound and hybrid silicon dioxide aerogel

A technology of silica and airgel, applied in the field of airgel, can solve the problems of large specific surface area, low thermal conductivity, high cost, etc., and achieve the effect of increasing specific surface area, strengthening mechanical strength and increasing porosity

Active Publication Date: 2020-06-05
中垦农芯(佛山)智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to its low thermal conductivity, large specific surface area, and low density, silica airgel has great potential application prospects in the fields of thermal insulation, carrier, and adsorption. Currently, due to its harsh preparation process and low strength Wait, there is no large-scale application
But the raw material that this method uses contains cage type silsesquioxane compound of alkoxy group and its preparation raw material of the cage type silsesquioxane containing coupling agent type also lacks large-scale production at present, and cost is very high, has limited Application of the method

Method used

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  • Polyalkoxy-containing silicon-based benzene compound and hybrid silicon dioxide aerogel
  • Polyalkoxy-containing silicon-based benzene compound and hybrid silicon dioxide aerogel
  • Polyalkoxy-containing silicon-based benzene compound and hybrid silicon dioxide aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Add 100g of 1,2,3-trivinylbenzene, 390g of trimethoxysilane and 1000ml of toluene into the container, raise the temperature to 90°C, add Karstedt catalyst (calculated as 10ppm according to the amount of Pt) under the protection of nitrogen, and control the reaction temperature to 115-120 °C for 4 hours. After the reaction, the solvent was distilled off and unreacted trimethoxysilane was distilled off under reduced pressure to obtain 327 g of 1,2,3-tris(trimethoxysilylethyl)benzene with a purity of 97.3% as measured by GC.

Embodiment 2

[0027] Add 100g of 1,3,5-trivinylbenzene, 630g of triethoxysilane and 2000ml of toluene into the container, raise the temperature to 90°C, add Karstedt catalyst (12ppm based on Pt amount) under the protection of nitrogen, and control the reaction temperature to 115- React at 120°C for 5 hours. After the reaction, the solvent was distilled off and unreacted triethoxysilane was distilled off under reduced pressure to obtain 407 g of 1,3,5-tris(triethoxysilylethyl)benzene with a purity of 97.8% as measured by GC.

Embodiment 3

[0029] Add 100g of 1,2,3-trivinylbenzene, 570g of 3-mercaptopropyltrimethoxysilane, 10g of benzoin butyl ether and 1000ml of absolute ethanol into the container, and irradiate with ultraviolet light with a dominant wavelength of 365nm and a light intensity of 8mW / cm for 3 minutes , removing ultraviolet light, distilling off absolute ethanol, and distilling off 3-mercaptopropyltrimethoxysilane under reduced pressure to obtain 471g of 1,2,3-tris(trimethoxysilylpropylthiaethyl)benzene, which was measured by GC The resulting purity was 96.9%.

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Abstract

The invention belongs to the technical field of aerogel, particularly relates to the technical field of silicon dioxide aerogel, and relates to a polyalkoxy-containing silicon-based benzene compound and hybrid silicon dioxide aerogel. The invention discloses a preparation method of the hybrid silicon dioxide aerogel. The preparation method comprises the following steps: mixing the polyalkoxy-containing silicon-based benzene compound, a silane coupling agent with a structural general formula of R5xMeySi (OR6)z, absolute ethyl alcohol and deionized water, adding an acid solution to adjust the pHvalue of a reaction system to 2-3 for hydrolysis, then adding an alkaline substance to adjust the pH value of the reaction system to 9-11 for condensation to obtain wet gel, carrying out aging, solvent replacement and drying on the wet gel so that the hybrid silicon dioxide aerogel is obtained. The hybrid silicon dioxide aerogel disclosed by the invention has a relatively high specific surface area of 1000m <2> / g or above, the preparation cost is relatively low, and large-scale production can be realized.

Description

technical field [0001] The invention relates to the technical field of airgel, in particular to the technical field of silica airgel, and relates to a polyalkoxysilylbenzene compound and hybrid silica airgel. Background technique [0002] Due to its low thermal conductivity, large specific surface area, and low density, silica airgel has great potential application prospects in the fields of thermal insulation, carrier, and adsorption. Currently, due to its harsh preparation process and low strength Wait, there is no large-scale application yet. A lot of research has been carried out in the industry, including various modifications to improve its strength and selection of different silicon sources to prepare silica aerogels with different compositions. [0003] CN106279694B discloses the use of cage-type silsesquioxane compounds containing alkoxy groups, cage-type silsesquioxanes containing coupling agents and hydrolyzable short-chain silanes as raw materials to prepare hyb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C07F7/18
CPCC01B33/1585C07F7/1876
Inventor 洪永建
Owner 中垦农芯(佛山)智能科技有限公司
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