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Preparation method of elastic double crosslinked aerogel

An aerogel, double-crosslinking technology, applied in the field of preparation of elastic double-crosslinking aerogel, can solve the problems of unfavorable practical application, increase of density and thermal conductivity, decrease of specific surface area and porosity of aerogel, etc. Achieve excellent transparency, good elasticity and hydrophobicity, avoiding the effect of supercritical drying process

Inactive Publication Date: 2019-05-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under normal circumstances, the introduction of polymers leads to the decrease of airgel specific surface area and porosity, and the increase of density and thermal conductivity, which is not conducive to its practical application.
So far, it is still a great challenge to prepare bulk elastic aerogels by atmospheric pressure drying

Method used

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  • Preparation method of elastic double crosslinked aerogel
  • Preparation method of elastic double crosslinked aerogel
  • Preparation method of elastic double crosslinked aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: A certain amount of vinylmethyldimethoxysilane is placed in a container, di-tert-butyl peroxide is added thereto, and then the surface of the liquid is covered with argon. After sealing the container, heat it at 130°C for 48 hours, and obtain a transparent viscous liquid after cooling down. Wherein, the molar ratio of vinylmethyldimethoxysilane to di-tert-butyl peroxide is 1:0.01.

[0035] Add n-butanol, water, and tetraethylammonium hydroxide to the viscous liquid in sequence. Wherein, the molar ratio of vinylmethyldimethoxysilane, n-butanol, water, and tetraethylammonium hydroxide is 1:4:2:0.045. The resulting sol was stirred for 4 minutes, transferred to a container and sealed, and then placed in an oven at 95° C. to gel and aged for 4 days. The resulting gel was replaced with ethanol four times for 12 hours each. The aerogel was obtained by volatilizing the gel under normal pressure at a temperature of 50° C. for 48 hours.

[0036] The sample obtained...

Embodiment 2

[0037] Example 2: A certain amount of vinylmethyldiethoxysilane was placed in a container, azobisisobutyronitrile was added thereto, and then the surface of the liquid was covered with nitrogen. After the container was sealed, it was heated at 140°C for 48 hours, and a transparent viscous liquid was obtained after cooling down. Wherein, the molar ratio of vinylmethyldiethoxysilane to azobisisobutyronitrile is 1:0.2.

[0038] Add benzyl alcohol, water, and ammonia water to the viscous liquid in sequence. Wherein, the molar ratio of vinylmethyldiethoxysilane, benzyl alcohol, water and ammonia water is 1:5:2:0.03. The resulting sol was stirred for 1 min, transferred to a container and sealed, then gelled and aged at room temperature for 4 days. The resulting gel was replaced 3 times with isopropanol for 6 hours each. The gel is placed in a carbon dioxide supercritical drying device for supercritical drying to obtain an aerogel.

[0039] The obtained sample has a density of 0....

Embodiment 3

[0040] Example 3: A certain amount of allylmethyldimethoxysilane was placed in a container, di-tert-butyl peroxide was added thereto, and then the liquid surface was covered with nitrogen. After the container was sealed, it was heated at 120°C for 72 hours, and a transparent viscous liquid was obtained after cooling down. Wherein, the molar ratio of allylmethyldimethoxysilane to di-tert-butyl peroxide is 1:0.2.

[0041] Add isopropanol, water, and tetramethylammonium hydroxide to the viscous liquid in sequence. Wherein, the molar ratio of allylmethyldimethoxysilane, isopropanol, water, and tetramethylammonium hydroxide is 1:5:1.5:0.06. The obtained sol was stirred for 10 minutes, transferred to a container and sealed, and then placed in an oven at 80° C. to gel and age for 2 days. The resulting gel was replaced 4 times with isopropanol for 12 hours each. The gel is placed in a carbon dioxide supercritical drying device for supercritical drying to obtain an aerogel.

[0042...

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Abstract

The invention provides a preparation method of elastic double crosslinked aerogel. Alkoxy silane containing vinyl or allyl serves as a precursor, monolithic aerogel is prepared by using a free radicalpolymerization / hydrolysis polymerization double crosslinking method combined with the supercritical drying or atmospheric drying technology. The aerogel has a double crosslinked nanoporous structureconsisting of polysiloxane and hydrocarbon chains. Due to a unique structure, the elastic double crosslinked aerogel has good transparency, high specific surface area, low density, good hydrophobicity, excellent compressibility and elasticity, and good bending properties. In addition, the material has super thermal insulation performance and low thermal conductivity at room temperature. The aerogel has practical application prospects in the field of super thermal insulation due to superior mechanical properties and thermal insulation properties.

Description

technical field [0001] The invention belongs to the technical field of preparation of airgel materials, and relates to a preparation method of elastic double-crosslinked airgel. Background technique [0002] Airgel is a porous material prepared by a sol-gel method combined with a special drying process. It has attracted extensive attention due to its excellent properties such as high specific surface area, high porosity, low density, and low thermal conductivity. So far, researchers have developed a variety of airgel materials such as silicon oxide, organic-inorganic composites, metal oxides, polymers, carbon, carbon nanotubes, and graphene. Aerogels have good application prospects in thermal insulation, adsorption, catalysis, batteries, supercapacitors, sensing, space particle capture and other fields. However, aerogels are mostly air and their backbones are composed of disordered cross-linked nanoparticles. Therefore, traditional airgel materials usually require expensi...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 祖国庆沈军
Owner TONGJI UNIV
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