Preparation method of graphene composite silica aerogel thermal insulation material

A technology of graphene composite and silicon airgel, which is applied in the direction of chemical instruments and methods, carbon compounds, silicon compounds, etc., can solve the problems of low strength and toughness, increase the thickness of heat insulation materials, and shedding of airgel powder, and achieve Good mechanical properties, simple process operation, and the effect of improving the problem of powder falling

Inactive Publication Date: 2021-06-01
东莞市道睿石墨烯研究院
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Problems solved by technology

[0003] SiO 2 As an emerging thermal insulation material, airgel has a porosity as high as 80%-99.8% and a specific surface area of ​​200-1000 m 2 / g, and the density can be as low as 0.03 g / cm 3 , has an ultra-low thermal conductivity (0.015 W / (m K)) at room temperature; due to its preparation method and its own structure, SiO 2 The strength and toughness of aerogels are relatively low, and in practical thermal insulation applications, they are usually combined with a series of reinforcements such as fiber mats; however, these SiO 2 The airgel blanket will have the problem of airgel powder falling off (that is, powder dropping). To solve this problem, the existing more effective technology is to attach a layer of glass fiber with a certain thickness to the surface of the airgel blanket. However, if you want to use this material with excellent heat insulation effect in electronic products such as mobile phones, this method will greatly increase the thickness of the heat insulation material, which is obviously not in line with the development trend of existing electronic products

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  • Preparation method of graphene composite silica aerogel thermal insulation material

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Embodiment 1

[0023] The following steps are adopted to prepare graphene composite silicon airgel thermal insulation material:

[0024] (1) Mix ethyl orthosilicate, absolute ethanol and water in a molar ratio of 1:7:3, then add hydrochloric acid with a mass fraction of 3% to make the pH of the solution to 3.0, stir and let stand to fully hydrolyze to obtain silicon Precursor;

[0025] (2) Take the GO (graphene oxide) solution after centrifugal cleaning, its solid content and pH value are 5% and 6.0, respectively, mix with the silicon precursor solution obtained in step (1), and sonicate for 10 min; then gradually add 0.3 mol / L ammonia water to make the pH of the mixed solution to neutral, add a small amount of DMF (N,N-dimethylformamide) and mix evenly to obtain graphene-SiO2 sol;

[0026] (3) Immerse the glass fiber surface mat in the graphene-SiO2 sol obtained in step (2), place it on a heating platform after ultrasonic treatment, and heat at a constant temperature of 70°C for 20 min to...

Embodiment 2

[0030] The following steps are adopted to prepare graphene composite silicon airgel thermal insulation material:

[0031] ⑴ Mix ethyl orthosilicate, absolute ethanol, and water in a molar ratio of 1:5:2, then add hydrochloric acid with a mass fraction of 3% to make the pH of the solution reach 3.0, stir and let stand to fully hydrolyze to obtain a silicon precursor ;

[0032] (2) Take the GO (graphene oxide) solution after centrifugal cleaning, its solid content and pH value are 5% and 6.0 respectively, mix it with the silicon precursor solution obtained in step (1), ultrasonicate for 20 min; then gradually add 0.3 mol / L Ammonia water makes the pH of the mixed solution to neutral, and a small amount of DMF (N,N-dimethylformamide) is added to mix evenly to obtain a graphene-SiO2 sol;

[0033] (3) Immerse the glass fiber surface mat in the graphene-SiO2 sol obtained in step (2), place on a heating platform after ultrasonic treatment, and heat at a constant temperature of 70°C f...

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Abstract

The invention relates to the technical field of graphene and thermal insulation materials, in particular to a preparation method of a graphene composite silica aerogel thermal insulation material, which comprises the following four steps: fully hydrolyzing tetraethoxysilane and ethanol to obtain a silicon precursor solution; mixing the graphene oxide with the silicon precursor solution; impregnating a fiber felt in the obtained graphene-SiO2 sol, and carrying out heating molding; and carrying out aging treatment and modification treatment on the fiber felt, and then drying. The graphene oxide (GO) does not change the production process of the existing silica aerogel felt, and only needs to be added before the silica gel is formed, and the process operation is simple, so that when the composite aerogel is combined with reinforcements such as glass fibers, a large amount of powder is not easy to fall off due to factors such as external force, and the problem of powder falling of the aerogel felt is greatly improved.

Description

technical field [0001] The invention relates to the technical field of graphene and thermal insulation materials, in particular to a preparation method of a graphene composite silicon airgel thermal insulation material. Background technique [0002] With the popularization of the 5G era, the performance of electronic products such as smartphones has been further improved, but during the use of these products, their structures will generate more heat than before. Some parts are heat-dissipated, but some special parts in some products need to be heat-insulated accordingly. Due to the increasingly thinner and thinner electronic products such as smartphones and the strictness and particularity of materials used in electronic products, When we insulate certain parts, the requirements for the selected insulation material are higher than before (such as thickness). [0003] SiO 2 As an emerging thermal insulation material, airgel has a porosity as high as 80%-99.8% and a specific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/24C01B33/158C01B32/198
CPCC04B28/24C01B33/1585C01B32/198C04B2201/20C04B2201/32C04B14/42
Inventor 蔡金明黄文添何健昌
Owner 东莞市道睿石墨烯研究院
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