Supported carbon aerogel-porous silicon dioxide composite material and preparation method thereof

A technology of porous silica and carbon aerogel, which is applied in the field of carbon aerogel composite materials, can solve the problems of carbon aerogel shrinkage and deformation, and achieve the effect of improving the compression resistance and good application prospects

Active Publication Date: 2020-03-06
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the main purpose of the present invention is to provide a load-bearing carbon airgel-porous silica composite material and its preparation method. The gel is filled in the pores of the bulk porous silica, and the porous framework structure of the bulk porous silica acts as a scaffold for the carbon airgel material to solve the problem of shrinkage deformation of the carbon airgel under pressure. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a method for preparing a loaded carbon aerogel-porous silica composite material, comprising the following steps:

[0028] 1) Prepare an aqueous solution of ethylene glycol with a concentration of 5 wt%, and add 1 g of the aqueous solution of ethylene glycol to 25 mL of sodium water glass with a concentration of 30 wt%, and stir well to obtain a uniform solution;

[0029] 2) Pour the solution obtained above into a crucible, put the crucible into a microwave oven, heat it with microwave for 3 minutes, take it out and wait for cooling, then heat it with microwave again for 3 minutes. Take out the intermediate product obtained before and put it into a small beaker, then put the small beaker into the large beaker, drip 2mL of concentrated hydrochloric acid with a concentration of 36wt% in the gap between the two beakers, seal the large beaker with plastic wrap, and place it in the pre- Insulate in an oven preheated to 90°C for 2 hours, take out the p...

Embodiment 2

[0034] This embodiment provides a method for preparing a loaded carbon aerogel-porous silica composite material, comprising the following steps:

[0035] 1) Prepare an aqueous solution of ethylene glycol with a concentration of 15 wt%, and add 0.3 g of the aqueous solution of ethylene glycol to 55 mL of sodium water glass with a concentration of 35 wt%, and stir well to obtain a uniform solution;

[0036] 2) Pour the solution obtained above into a crucible, put the crucible into a microwave oven, heat it with microwave for 3 minutes, take it out to cool down, and heat it with microwave again for 3 minutes. Take out the intermediate product obtained before and put it into a small beaker, then put the small beaker into the large beaker, drip 2mL of concentrated hydrochloric acid with a concentration of 40wt% in the gap between the two beakers, seal the large beaker with plastic wrap, and place it in the pre- Preheated to 90 ° C oven for 2 hours, after taking out the product, rin...

Embodiment 3

[0041] This embodiment provides a method for preparing a loaded carbon aerogel-porous silica composite material, comprising the following steps:

[0042] 1) Prepare an aqueous ethylene glycol solution with a concentration of 20wt%, and take 0.75g of an aqueous ethylene glycol solution, add it to 40mL of sodium water glass with a concentration of 40%, stir well to obtain a uniform solution;

[0043] 2) Pour the solution obtained above into a crucible, put the crucible into a microwave oven, heat it with microwave for 6 minutes, take it out and wait for cooling, then heat it with microwave again for 5 minutes. Take out the intermediate product obtained before and put it into a small beaker, then put the small beaker into the large beaker, drip 4mL of concentrated hydrochloric acid with a concentration of 37wt% in the gap between the two beakers, seal the large beaker with plastic wrap, and place it in the pre- Preheat to 100° C. and keep it in an oven for 2 hours. After taking o...

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Abstract

The invention discloses a supported carbon aerogel-porous silicon dioxide composite material and a preparation method thereof. The preparation method comprises the following steps: preparing blocky porous silicon dioxide by using a microwave foaming method; then with the blocky porous silicon dioxide as a carrier, adding the blocky porous silicon dioxide into a carbon aerogel precursor solution; performing gelatinizing, and then performing solvent replacement; and performing supercritical drying and carbonization so as to allow a carbon aerogel material to be internally supported by a blocky porous silicon dioxide material skeleton inside and the pores of the blocky porous silicon dioxide material to be uniformly filled with carbon aerogel particles. With the method in the invention, the mechanical properties of carbon aerogel are effectively improved, and the supported carbon aerogel-porous silicon dioxide composite material is formed and can be applied to the fields of heat insulation, catalysis, adsorption materials and the like.

Description

technical field [0001] The invention relates to the field of carbon airgel composite materials, in particular to a loaded carbon airgel-porous silica composite material and a preparation method thereof. Background technique [0002] Airgel is the solid material with the smallest density in the world. It is composed of countless nanoparticles aggregated and cross-linked, and has a continuous three-dimensional nanoporous structure. It is precisely because carbon airgel is a porous nanostructure with extremely high porosity, high specific surface area (500-1500m 2 / g), low density (0.01~0.03g / cm 3 ), the particularity of the structure makes it have excellent optical, electrical, thermal and other properties. Therefore, airgel materials have good application prospects in the fields of sound insulation, heat insulation, supercapacitors and catalysis. However, most airgel materials have low strength, poor toughness, and unstable structure, which greatly limit their applications....

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/52C04B35/64
CPCC04B35/14C04B35/52C04B35/64C04B2235/6562C04B2235/6565C04B2235/77C04B2235/9607C04B2235/96
Inventor 艾兵张世超孙现凯孙浩然陈玉峰胡利明方凯闫达琛陶柳实
Owner CHINA BUILDING MATERIALS ACAD
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