A kind of high temperature resistant elastic graphene airgel and preparation method thereof

An elastic graphite, high temperature resistant technology, applied in aerogel preparation, chemical instruments and methods, colloidal chemistry, etc., can solve the problems of destroying graphene aerogel structure, elastic graphene aerogel limitation, etc., and achieve slow oxidation , the effect of excellent resilience

Active Publication Date: 2022-04-29
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in an aerobic environment, most of the graphene aerogels reported so far oxidize above 350°C, seriously destroying the structure of graphene aerogels, accompanied by a sharp drop in elastic properties, which makes elastic graphite The application of ene airgel in the field of high temperature insulation has been greatly limited

Method used

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  • A kind of high temperature resistant elastic graphene airgel and preparation method thereof
  • A kind of high temperature resistant elastic graphene airgel and preparation method thereof
  • A kind of high temperature resistant elastic graphene airgel and preparation method thereof

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preparation example Construction

[0034] The present invention provides a kind of preparation method of high temperature resistant elastic graphene airgel in first aspect, described method comprises the steps:

[0035](1) graphene oxide solution (such as graphene oxide aqueous solution), reducing agent, surfactant and silica sol are stirred and mixed uniformly to obtain precursor foam (also referred to as graphene oxide precursor foam); in the present invention, For example, first add the purified graphene oxide aqueous solution in a beaker, then add reducing agent, surfactant and silica sol in turn, and use a stirring paddle with a suitable diameter to stir evenly to obtain a graphene oxide precursor foam for subsequent use; in the present invention , it is preferred that the graphene oxide contained in the graphene oxide aqueous solution is all single-layered, and the purchased graphene oxide is subjected to high-speed centrifugal purification before use to make the sheet diameter distribution as narrow as po...

Embodiment 1

[0070] ①Add 15mL of single-layer graphene oxide aqueous solution (wherein the diameter of the graphene sheet is 6±2μm and the concentration is 10mg / mL) after centrifugation and purification into a 150mL beaker, then add 0.6g of sodium ascorbate, 0.15g of surfactant benzene Ethylene maleic anhydride resin SMA and 1 mL of silica sol with lysine surface modification and excellent monodispersity (containing silica nanoparticles with a particle size of 8 ± 1 nm and a mass fraction of 25%), and using a diameter of 2.5 cm The stirring paddle was stirred at a stirring speed of 1600rpm for 5min to stir the above-mentioned mixed solution evenly to obtain about 40mL graphene oxide precursor foam (bubble rate 2.5) for use.

[0071] ②Pour the above-mentioned graphene oxide precursor foam into the tetrafluoroethylene liner of a metal reactor with a height of 3cm and a diameter of 1.5cm, tighten the reactor, and put the reactor into a blast furnace with a temperature of 70°C. Reaction in the...

Embodiment 2

[0077] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0078] In step ①, add 10 mL of single-layer graphene oxide aqueous solution (wherein the diameter of the graphene sheet is 6±2 μm and the concentration is 10 mg / mL) after centrifugal purification into a 150 mL beaker, then add 0.1 g sodium ascorbate, 0.01 g Surfactant styrene maleic anhydride resin SMA and 1mL surface modified with lysine, silica sol with excellent monodispersity (the particle size of silica nanoparticles contained is 8 ± 1nm, mass fraction is 25%), and use A stirring blade with a diameter of 2.5 cm was stirred at a stirring speed of 1600 rpm for 5 minutes to stir the above mixed solution evenly to obtain a graphene oxide precursor foam for use.

[0079] After the high-temperature resistant elastic graphene airgel prepared in this example was subjected to a high-temperature assessment in an oven at 800°C and in an air atmosphere for 10 minutes, the shape of the airgel did not chang...

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Abstract

The invention relates to a high temperature resistant elastic graphene aerogel and a preparation method thereof. The method comprises the following steps: (1) stirring and mixing a graphene oxide solution, a reducing agent, a surfactant and a silica sol evenly to obtain a precursor foam; (2) subjecting the precursor foam to a hydrothermal reduction reaction to obtain a graphene wet gel with silica sol suspended in the pores; (3) performing the steps of directional freezing and freeze-drying on the graphene wet gel to obtain pores The graphene aerogel that is loaded with silica nanoparticles on the wall; (4) the graphene aerogel is thermally annealed at a high temperature under an inert atmosphere to obtain a high temperature resistant elasticity that is covered with a thin layer of silica nanoparticles on the pore wall Graphene aerogel. The invention prepares graphene aerogel with high temperature resistance and high elasticity, greatly improves the temperature resistance of graphene aerogel materials in an aerobic environment from not more than 600 DEG C commonly reported to 800 DEG C, and broadens its application in High temperature and high elasticity applications.

Description

technical field [0001] The invention belongs to the technical field of nanoporous materials, and relates to a preparation method of graphene airgel, in particular to a high-temperature-resistant elastic graphene airgel and a preparation method thereof. Background technique [0002] Graphene airgel is an important member of the airgel family. It has many excellent properties such as rich pore structure, ultra-high specific surface area, ultra-low density, excellent electrical conductivity, and ultra-low thermal conductivity. Environment, sensing, catalysis, electronics, heat insulation, medicine and many other fields have shown broad application prospects. Elastic materials with large reversible deformation function are widely required in various engineering applications. Therefore, among the many reported graphene airgel materials, graphene aerogels with high resilience mechanical properties are particularly attractive. It is generally believed that the elasticity of graphe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 张晚林刘圆圆张恩爽黄红岩雷朝帅李文静杨洁颖张昊赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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