Graphene aerogel material and preparation method thereof

A technology of graphene airgel and graphene hydrogel, which is applied in the field of composite materials, can solve the problem of high thermal conductivity, achieve the effect of improving high thermal conductivity and improving mechanical strength

Active Publication Date: 2016-01-27
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Then, an object of the present invention is to overcome the high thermal conductivity problem of existing graphene airgel

Method used

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  • Graphene aerogel material and preparation method thereof
  • Graphene aerogel material and preparation method thereof

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Example Embodiment

[0016] As described above, in the first aspect, the present invention provides a method for preparing graphene aerogel material. In general, the method of the present invention mainly includes the following steps: preparing a precursor solution, sol-gel reaction, solvent replacement and drying (for example figure 1 Shown).

[0017] More specifically, the method of the present invention may include the following steps:

[0018] (1) Preparation of precursor solution: mixing graphene oxide and framework filler and stirring uniformly to obtain a precursor solution;

[0019] (2) Preparation of graphene hydrogel: adding a catalyst to the precursor solution and stirring it evenly, then pour it into a mold with reinforcing fibers and seal it, and heat the mold to react to obtain a fiber-reinforced graphene hydrogel;

[0020] (3) Preparation of graphene ketone gel: placing the graphene hydrogel in an acetone solution for solvent replacement to obtain a graphene ketone gel;

[0021] (4) Prepara...

Example Embodiment

[0031] Example 1

[0032] Using 0.2mg / ml graphene oxide solution, resorcinol + formaldehyde system as the framework filler, the mass ratio of graphene oxide to framework filler is 10:1, after the two are evenly mixed, add 50 times the mass of graphene oxide After stirring the p-phenylenediamine evenly, pour it into a mold with carbon fiber placed in advance. The mass ratio of carbon fiber to precursor solution is 80:20. After sealing, place it in an oven and react at 80°C for 2 days to obtain graphite Ene hydrogel. The graphene hydrogel after the sol-gel was taken out, placed in an acetone solution, and subjected to solvent replacement. The acetone was replaced once every 2 days for a total of 3 replacements to obtain a graphene ketone gel in acetone solvent. The graphene ketone gel is taken out and subjected to supercritical drying to prepare a fiber-reinforced graphene aerogel material. Then measure the thermal conductivity and material strength (compressive strength, the sam...

Example Embodiment

[0035] Example 2

[0036] Using 0.5mg / ml graphene oxide solution, melamine + formaldehyde system as the framework filler, the mass ratio of graphene oxide to framework filler is 10:1, after the two are evenly mixed, add 100 times the mass of graphene oxide ethylene diamine After stirring, pour it into a mold with carbon fiber in advance. The mass ratio of carbon fiber to precursor solution is 80:20. After sealing, place it in an oven and react at 80°C for 2 days to obtain graphene hydrogel. . The graphene hydrogel after the sol-gel was taken out, placed in an acetone solution, and subjected to solvent replacement. The acetone was replaced once every 2 days for a total of 3 replacements to obtain an acetone solvent graphene ketone gel. The graphene ketone gel is taken out and subjected to supercritical drying to prepare a fiber-reinforced graphene aerogel material. Then measure the thermal conductivity and material strength of the resulting material.

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Abstract

The invention discloses a graphene aerogel material and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a precursor solution, namely mixing graphene oxide with a framework filler, and stirring uniformly to obtain the precursor solution; (2) preparing graphene hydrogel, namely adding a catalyst into the precursor solution, stirring uniformly, then pouring into a mold containing reinforcing fibers, sealing the mold, and heating the mold for reaction, thereby obtaining fiber reinforced graphene hydrogel; (3) preparing graphene ketone gel, namely putting the graphene hydrogel into an acetone solution to perform solvent replacement so as to obtain the graphene ketone gel; and (4) preparing graphene aerogel, namely taking out the graphene ketone gel, and drying to obtain a fiber reinforced graphene aerogel material. The invention also relates to the graphene aerogel material prepared by the method, and the graphene aerogel material is low in heat conductivity and high in strength, and can be used as a high-temperature heat insulating material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a preparation method of a composite material, in particular to a preparation method of a graphene airgel material and a graphene airgel material prepared according to the method. Background technique [0002] Airgel material is a kind of nanoporous solid material with network structure formed by the mutual accumulation of colloidal particles or polymer molecules. Because its pore size (<50nm) is smaller than the mean free path of air molecules (~70nm), it is There is no air convection in the pores of airgel, and it has extremely low gaseous heat conduction; at the same time, airgel has extremely high porosity, the volume ratio of solid is very low, and solid heat conduction is also very low. Carbon-based aerogels have the best high temperature resistance (≥1600°C) among various aerogels, and have irreplaceable advantages in the field of thermal protection for high Ma...

Claims

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Application Information

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IPC IPC(8): C01B31/04C04B30/02
Inventor 郭慧刘斌金兆国赵英民裴雨辰
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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