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A kind of graphene/silicon dioxide composite airgel material and preparation method thereof

A composite aerogel and silica technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of poor temperature resistance and easy failure, and achieve the effect of improving high temperature failure performance.

Active Publication Date: 2019-06-21
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the hydrophobic reagent of the existing silica airgel material has poor temperature resistance and is prone to failure at high temperature

Method used

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  • A kind of graphene/silicon dioxide composite airgel material and preparation method thereof
  • A kind of graphene/silicon dioxide composite airgel material and preparation method thereof
  • A kind of graphene/silicon dioxide composite airgel material and preparation method thereof

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preparation example Construction

[0020] As mentioned above, the first aspect of the present invention provides a kind of preparation method of graphene / silicon dioxide composite airgel material, described method comprises the steps:

[0021] (1) Preparation of graphene oxide / silica system hydrogel

[0022] Mixing and stirring the silicon dioxide precursor solution and the graphene oxide solution evenly to form a composite precursor solution, and heating the composite precursor solution to obtain a graphene oxide / silica system hydrogel;

[0023] (2) Preparation of graphene oxide / silica system alcohol gel

[0024] placing the graphene oxide / silicon dioxide system hydrogel in an alcohol solvent replacement solution for solvent replacement to obtain an alcohol gel;

[0025] (3) Preparation of graphene oxide / silica composite airgel

[0026] The alcohol gel is dried to obtain a graphene oxide / silicon dioxide composite airgel;

[0027] (4) Preparation of graphene / silica composite airgel

[0028] The graphene oxi...

Embodiment 1

[0048] Use tetraethyl orthosilicate precursor solution and 0.2mg / ml graphene oxide solution to mix according to 5:1. After stirring evenly, a composite precursor solution is formed. Put the composite precursor solution in a water bath and heat at 50°C for 30min to obtain Graphene oxide / silica system hydrogel. The hydrogel was placed in an ethanol solution for solvent replacement, and the ethanol was replaced once a day for a total of 3 replacements to obtain a graphene oxide / silica system alcohol gel. The graphene oxide / silica system alcohol gel was taken out and dried by supercritical carbon dioxide (40°C, 10MPa) to prepare the graphene oxide / silica composite aerogel. Finally, after high temperature treatment, the graphene / silicon dioxide composite airgel is prepared. Wherein, the high temperature treatment condition is 600° C., inert atmosphere nitrogen protection, and treatment for 2 hours.

Embodiment 2

[0050] Use silica sol solution and 0.5mg / ml graphene oxide solution to mix according to 5:1, after stirring evenly, form a composite precursor solution, put the composite precursor solution in a water bath and heat at 60°C for 30min to obtain graphene oxide / dioxide Silica system hydrogel. The hydrogel was placed in an ethanol solution for solvent replacement, and the ethanol was replaced once a day for a total of 3 replacements to obtain a graphene oxide / silica system alcohol gel. The graphene oxide / silica system alcohol gel was taken out, and subjected to supercritical drying (40° C., 10 MPa), to prepare a graphene oxide / silica composite airgel. Finally, after high temperature treatment, the graphene / silicon dioxide composite airgel is prepared. Wherein, the high temperature treatment condition is 600° C., inert atmosphere nitrogen protection, and treatment for 2 hours.

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Abstract

The invention relates to a graphene / silica composite aerogel material and a preparation method thereof. The preparation method comprises the following steps: 1, preparing a graphene oxide / silica system hydrogel; 2, preparing a graphene oxide / silica system alcogel; 3, preparing graphene oxide / silica composite aerogel; and 4, preparing the graphene / silica composite aerogel material. The graphene / silica composite aerogel material prepared through the preparation method has good high-temperature hydrophobic performance, and can tolerate a temperature of 400 DEG C or above, so the application range of silica composite aerogel is enlarged.

Description

technical field [0001] The invention relates to a preparation method of a composite airgel, in particular to a preparation method of a graphene / silicon dioxide composite airgel, and belongs to the technical field of composite materials. Background technique [0002] Silica airgel is a lightweight nanoporous amorphous solid material with low density and high porosity. Aerogels contain nanoscale pore structures (1 to 100 nm) and have extremely large specific surface areas (200 to 1000 m 2 / g), very high porosity (80 to 99.8%), very low density (1 to 500kg / m 3 ) and small thermal conductivity and other characteristics, all show unique properties in mechanics, acoustics, heat, optics and other aspects. Silica aerogels have shown broad potential application prospects in many aspects, such as: super heat insulation materials, Cerenkov detectors, high-efficiency rechargeable batteries, supercapacitors, acoustic impedance coupling materials, catalysts and carriers, etc. Its uniqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585
Inventor 郭慧张凡刘圆圆刘斌赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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