Antioxidative carbon aerogel material and preparation method thereof

Abstract

The invention provides a method of preparing an antioxidative carbon aerogel material. The method comprises the following steps: providing a carbon aerogel material and a reactive solution containinga siloxane precursor; impregnating the carbon aerogel material by using the reactive solution; carrying out an in-situ reaction on the siloxane precursor on the surface of the carbon aerogel particlesunder the enclosed condition to generate an antioxidative precursor film; drying the carbon aerogel material; pyrolyzing the carbon aerogel material at high temperature; and repeating step (2) to step (5) to obtain the antioxidative carbon aerogel material. The invention also provides an antioxidative carbon aerogel material prepared by the above method. The oxidation resistance of the carbon aerogel material can be improved with a low weight gain rate. Thereby, under the precondition of no significant increase in the weight of the carbon aerogel, oxidation resistance of the carbon aerogel isremarkably enhanced, and the carbon aerogel material with low thermal conductivity and high oxidation resistance is obtained. The method of the invention also has advantages of simple process and strong applicability.

Description

technical field [0001] The invention relates to the technical field of airgel materials, in particular to an oxidation-resistant carbon airgel material and a preparation method thereof. Background technique [0002] Carbon airgel material is a porous material formed by stacking nano-carbon particles. It has the characteristics of low density, high specific surface area, low thermal conductivity, strong resistance to infrared radiation, and excellent electrical properties. It is the currently known temperature resistance The airgel material with the highest (≥2000°C under inert atmosphere) has broad application prospects in the fields of electrochemistry, porous carriers, and ultra-high temperature insulation. The patent application documents with publication numbers CN107324453A, CN108285135A, and CN107473761A all involve carbon Preparation of airgel and its application in different fields. [0003] Since the matrix of the carbon airgel material is carbon, the carbon airgel...

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Problems solved by technology

However, in the reported methods, the antioxidant precursors undergo a gel process when impregnated inside the carbon aerogel, resulting in a large amount of ceramized products remaining in the carbon aerogel, except for the partial coating on the surface of the carbon particles to play a role In addition to the anti-oxidation effect, most of the pores are blocked, resulting in a material weight increase of 3 to 5 times, and a substantial increase in density and thermal conductivity

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