Preparation method of graphene composite silica aerogel thermal insulation material

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...

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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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