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Method for preparing silicon dioxide aerogel composite material

A technology of silica and composite materials, applied in the chemical industry, which can solve problems such as poor mechanical properties

Inactive Publication Date: 2016-07-06
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cracking of silica airgel remains a major obstacle due to its poor mechanical properties.

Method used

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  • Method for preparing silicon dioxide aerogel composite material
  • Method for preparing silicon dioxide aerogel composite material
  • Method for preparing silicon dioxide aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation of embodiment 1 pure silica airgel

[0020] First, weigh a certain amount of surfactant (hexadecyltrimethylammonium bromide) and add it to the beaker, then add methanol and acetic acid solution with a volume ratio of 1:3, stir to dissolve the surfactant, and then add volume MTMS (methyltrimethoxysilane) and DMDMS (dimethyldimethoxysilane) with a ratio of 3:2 and a certain amount of DMF (N,N-dimethylformamide), placed in a constant temperature magnetic stirrer In the process, stir for 1 hour at 30°C to make it fully hydrolyzed, then add lye to adjust the pH value, stir to make the lye and the solution fully mixed, and place it in a constant temperature water bath at 40°C until the solution forms a gel. After aging for 6 hours, alcohol solution and alkane were added to replace them for 6 hours, and finally dried under normal pressure to prepare elastic airgel.

Embodiment 2

[0021] Embodiment 2 Preparation of carbon fiber toughened airgel

[0022] In the process of preparing airgel, add about 2mm of carbon fiber, magnetic stirring, add dispersant MC (methyl cellulose), CMC (sodium hydroxymethyl cellulose) to disperse the fiber, form a gel, and further age and solvent replacement, and finally dried. The effect of different dispersant additions on the fiber dispersion effect is shown in Table 2-3.

[0023] Table 1 Effect of different dispersant additions on fiber dispersion effect

[0024]

[0025] It can be seen from Table 1 that CMC has the best dispersion effect, and CMC is selected as the dispersant.

Embodiment 3

[0026] The preparation of embodiment 3 graphene toughened airgel

[0027] During the preparation process of the airgel, a certain amount of graphene is added, stirred and mixed, and the graphene is evenly dispersed in it, then a gel is formed, and finally dried. The material is characterized by excellent elasticity, like a sponge, and has very good bending and compression properties. The airgel after adding graphene is supported by graphene as a skeleton, which enhances its toughness and improves its repeated use performance.

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Abstract

The invention provides a method for preparing a silicon dioxide aerogel composite material. The method comprises the following steps: adding a surfactant into a beaker, adding methanol and an acetic acid solution in a volume ratio of 1:3, stirring to dissolve the surfactant, further adding DMF and MTMS and DMDMS in a volume ratio of 3:2, putting into a constant-temperature magnetic stirrer, stirring at 30 DEG C to sufficiently hydrolyze the components, adding an alkali liquid to adjust the pH value, stirring to sufficiently mix the alkali liquid with the solution, putting into a constant-temperature water bath pot till the solution is gelated, aging, further adding an alcoholic solution and alkane, respectively replacing, and finally performing normal-pressure drying, thereby preparing elastic aerogel. The method has the beneficial effects that the steps are simple, and the prepared aerogel composite material is good in mechanical strength, good in thermal resistance and good in reusability.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing a silica airgel composite material. Background technique [0002] Airgel is a kind of highly dispersed solid-state material that is composed of colloidal particles or polymer molecules aggregated into a nanoporous network structure, and filled with a gaseous dispersion medium in the pores. It is a nanomaterial. Due to the unique structure of airgel, which has the characteristics of high porosity, low density, and good sound and heat insulation, its application in high-tech fields such as civil aerospace and military affairs has attracted increasing attention. A large number of nanoscale cavity structures in the cellulose gel structure and the hydroxyl groups in the cellulose macromolecules provide the possibility for the high performance and functionalization of cellulose aerogels. However, cracking of silica airgel remains a major ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16C04B38/00C04B30/02
CPCC01B33/163C01P2002/72C01P2004/03C04B30/02
Inventor 李贞玉史明佳唐存国杨旭东贾菲韩玉香曹雅海周俊玲
Owner CHANGCHUN UNIV OF TECH
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