A method for preparing bulk graphene airgel

A graphene aerogel, graphene dispersion technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of increasing the production cost of graphene aerogel, harsh process conditions, complex preparation process, etc. , to achieve the effect of improving mechanical strength and compression performance, high mechanical strength, and simple steps

Active Publication Date: 2018-04-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The additives or crosslinking agents used in these published patents are relatively expensive, and the preparation process is more complicated than pure graphene aerogels and even requires harsh process conditions, which undoubtedly increases the production cost of graphene aerogels. limit its application in many fields

Method used

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  • A method for preparing bulk graphene airgel
  • A method for preparing bulk graphene airgel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 0.3g of prepared graphite oxide and add it to a beaker containing 100ml of distilled water, take it out after ultrasonication for 1.5h, cool to room temperature, and obtain a graphene oxide dispersion, add 60mL of propylene oxide PO at one time, and control its concentration by NaOH solution after stirring. The pH value is in the range of 2.0-6.8, then put the graphene oxide dispersion liquid added with propylene oxide into the reaction kettle, put it into the oven for reaction, first set the temperature to 60°C, and after 30 minutes of reaction, raise the temperature to 80°C, after 1 hour of reaction, raise the temperature to 250°C for 60 hours to obtain a wet gel, freeze-dry the wet gel at -50°C for 9 hours to obtain a product with high mechanical strength, good elasticity and a density as low as 0.19g / cm 3 ultralight graphene aerogels.

Embodiment 2

[0024] Take 0.5g of prepared graphite oxide and add it to a beaker filled with 100ml of distilled water, take it out after ultrasonication for 1.5h, cool to room temperature, and obtain a graphene oxide dispersion, add 10ml of propylene oxide PO at one time, and control its concentration by NaOH solution after stirring. The pH value is in the range of 2.0-6.8, then put the graphene oxide dispersion liquid added with propylene oxide into the reaction kettle, put it into the oven for reaction, first set the temperature to 60°C, and after 30 minutes of reaction, raise the temperature to After reacting for 1 hour at 80°C, the temperature was increased to 250°C for 6.5 hours to obtain a wet gel, and the wet gel was freeze-dried at -50°C for 9 hours to obtain a graphene airgel.

Embodiment 3

[0026] Take 0.5g of prepared graphite oxide and add it to a beaker filled with 100ml of distilled water, take it out after ultrasonication for 1.5h, cool to room temperature, and obtain a graphene oxide dispersion, add 100ml of propylene oxide PO at one time, and control its concentration by NaOH solution after stirring. The pH value is in the range of 2.0-6.8, then put the graphene oxide dispersion liquid added with propylene oxide into the reaction kettle, put it into the oven for reaction, first set the temperature to 60°C, and after 30 minutes of reaction, raise the temperature to After reacting for 1 hour at 80°C, the temperature was raised to 120°C for 18 hours to obtain a wet gel, and the wet gel was dried under normal pressure for 10 hours to obtain a graphene airgel.

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Abstract

The invention discloses a method for preparing block graphene aerogel. The method includes the specific steps that cheap small molecule epoxy propane serves as a cross-linking agent and is mixed with oxidized graphene or graphene dispersion liquid, a hydrothermal method is utilized to obtain graphene wet gel, drying is further conducted, and the graphene aerogel is obtained. The method is simple in operation step, good in repeatability, mild in reaction condition and suitable for industrialized production, the price of the cross-linking agent is low, and the finally obtained graphene aerogel is complete in block degree, low in density, good in elasticity and high in mechanical strength.

Description

technical field [0001] The invention relates to the field of graphene airgel preparation, in particular to a simple and fast method for preparing graphene airgel with large block size, high strength and good compressibility. Background technique [0002] Because aerogels have many unique advantages such as low density, small thermal conductivity, and well-developed pores, they are used in heat-insulating refractory materials, sound-absorbing and shock-absorbing materials, catalysts, dust traps, and purifiers for gas and water. Broad application prospects. Graphene aerogels (Graphene aerogels) not only have a series of characteristics of traditional aerogels, but because of the excellent physical and chemical properties of its building units, it further endows aerogels with unique three-dimensional structure properties, such as super adsorption. At the same time, based on Its unique monolithic structure, high specific surface area, and excellent electrical conductivity endow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B32/194
CPCC01P2006/10
Inventor 任丽丽高丙莹贺赫卢绍祥
Owner SOUTHEAST UNIV
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