Silicon dioxide-methyl methacrylate composite aerogel material based on surface modification and preparation method thereof

A technology of methyl methacrylate and composite airgel, which is applied in the field of green building materials to achieve the best thermal insulation performance

Inactive Publication Date: 2016-06-22
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have not fundamentally solved the problem of heat dissipation of transparent enclosure structures, or the thermal insulation methods of these glass components are far from meeting our expectations (Liu Nianxiong, Qin Youguo, Building Thermal Environment, Tsinghua University Press, 2005 )

Method used

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  • Silicon dioxide-methyl methacrylate composite aerogel material based on surface modification and preparation method thereof
  • Silicon dioxide-methyl methacrylate composite aerogel material based on surface modification and preparation method thereof
  • Silicon dioxide-methyl methacrylate composite aerogel material based on surface modification and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add 0.1g12mol / L hydrochloric acid to 80g tetraethyl orthosilicate, stir at room temperature for 28min and then let it stand for 35min, then add 0.14 sodium hydroxide, stir until it is completely dissolved, and get the wet gel after standing the above solution for 2h. Add 0.2g methacryloyloxyethyl dodecyl dimethyl ammonium chloride to the gel, after standing for 6h, put the product in CO 2 In a supercritical high-pressure extraction device, CO 2 The medium is subjected to supercritical drying at a temperature of 33°C and an air pressure of 7 MPa for 3 hours to obtain silica airgel. Add 10 g of silica airgel to 100 g of methyl methacrylate, and then perform ultrasonic dispersion for 1 hour. Then add 0.2 g of dibenzoyl peroxide, ultrasonically disperse for 10 minutes, and then place the dispersion in a water bath at 75°C to trigger methyl methacrylate and methacryloyloxyethyl on the surface of the silica airgel. Copolymerize dialkyl dimethyl ammonium chloride, take it out...

Embodiment 2

[0028] Add 0.8g of 12mol / L hydrochloric acid to 110g of ethyl orthosilicate, stir at room temperature for 30min and let it stand for 150min, then add 0.01sodium hydroxide, stir until it is completely dissolved, and get the wet gel after the above solution is left for 3h. Add 0.6g methacryloyloxyethyl dodecyl dimethyl ammonium chloride to the gel, after standing for 3h, put the product in CO 2 In a supercritical high-pressure extraction device, CO 2 The medium is subjected to supercritical drying at a temperature of 46°C and an air pressure of 8 MPa for 3 hours to obtain silica airgel. Add 5 g of silica airgel to 100 g of methyl methacrylate, and then perform ultrasonic dispersion for 1 hour. Then add 0.02 g of dibenzoyl peroxide, ultrasonically disperse for 3 minutes, and then place the dispersion liquid in a water bath at 75°C to trigger methyl methacrylate and methacryloyloxyethyl on the surface of the silica airgel. Copolymerize dialkyl dimethyl ammonium chloride, take it ...

Embodiment 3

[0030] Add 0.2g of 12mol / L hydrochloric acid to 150g of ethyl orthosilicate, stir at room temperature for 5 minutes and let it stand for 180 minutes, then add 0.16 sodium hydroxide, stir until it is completely dissolved, and leave the above solution for 6 hours to obtain a wet gel. Add 0.7g methacryloyloxyethyl dodecyl dimethyl ammonium chloride to the gel, after standing for 5h, put the product in CO 2 In a supercritical high-pressure extraction device, CO 2 The medium is subjected to supercritical drying at a temperature of 50°C and an air pressure of 9 MPa for 3 hours to obtain silica airgel. Add 7 g of silica airgel to 100 g of methyl methacrylate, and then perform ultrasonic dispersion for 1 hour. Then add 0.14g of dibenzoyl peroxide, ultrasonically disperse for 4.8min, and then place the dispersion in a water bath at 75°C to trigger methyl methacrylate and methacryloyloxyethyl on the surface of the silica airgel. Copolymerize dodecyldimethylammonium chloride, take it ou...

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Abstract

The invention discloses a surface-modified silica-methyl methacrylate composite airgel material and a preparation method thereof. The electrostatic attraction of the positive charge of dodecyl dimethyl ammonium chloride is used for adsorption, and then the unsaturated bond is used to copolymerize with methyl methacrylate in the bulk system, and the copolymer molecular chain is introduced into the airgel surface, and the copolymer The macromolecular chains are evenly wrapped on the surface of the airgel skeleton, which can keep the airgel product in a three-dimensional network structure and have excellent thermal insulation performance. The composite airgel material prepared by the invention has the characteristics of high phase interface heat resistance and high heat insulation.

Description

technical field [0001] The invention belongs to the technical field of green building materials, and more specifically relates to a preparation method of a silica airgel material with a high thermal resistance phase interface. Background technique [0002] The heat loss of the transparent envelope accounts for a large proportion of the building's energy consumption, largely due to the low thermal insulation of the glass elements of the building. Especially at the moment when environmental and energy problems are becoming more and more serious, improving the thermal insulation level of building transparent envelopes and striving to promote building energy conservation have profound implications for improving building thermal environment, reducing environmental pollution, and protecting earth resources and ecological environment. significance. In fact, people have long realized the problem of large heat dissipation of building transparent envelopes, and proposed some methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/14C01B33/16
CPCC08F292/00C01B33/16
Inventor 李洪彦刘洪丽赵巍周建国李婧李亚静
Owner TIANJIN CHENGJIAN UNIV
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