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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 material, provide a kind of preparation method of graphene airgel material and the graphene airgel material made by this method

Method used

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  • Graphene aerogel material and preparation method thereof

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preparation example Construction

[0016] As mentioned above, the present invention provides a method for preparing a graphene airgel material in a first aspect. Generally speaking, described method of the present invention mainly comprises the following steps: preparation 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) Preparing the precursor solution: mixing the graphene oxide and the skeleton filler and stirring evenly to obtain the precursor solution;

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

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

[0021] (4) Prepara...

Embodiment 1

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

Embodiment 2

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

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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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