Preparation method of graphene aerogel powder and graphene aerogel powder

A graphene aerogel, graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems affecting processing and use performance, powder density increase, pore structure collapse, etc., and achieve a wide range of applications Value and Market Prospect, Effects of Low Density, Process Safety

Active Publication Date: 2018-06-12
昂星新型碳材料常州有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of pulverizing graphene airgel to prepare powder, there is also the problem that the pore structure collapses and the powder density doubles, which reduces its application performance and affects subsequent processing and use performance.
[0005] In addition, in the drying process of ice-like materials, the sublimation dehydration process is from the outside to the inside, limited by the limited surface area, the drying speed is slow
There are also challenges in how to improve drying efficiency and shorten drying time with a simple process

Method used

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  • Preparation method of graphene aerogel powder and graphene aerogel powder
  • Preparation method of graphene aerogel powder and graphene aerogel powder
  • Preparation method of graphene aerogel powder and graphene aerogel powder

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[0033] In the preparation method of the present invention, the graphene-based aerogel in the form of powder particles is directly obtained by freezing the graphene-based slurry or dispersion liquid, pulverizing, sieving and freeze-drying, which can avoid pulverized graphene oxide aircondensation The risk of explosion during the glue process can also increase the drying rate of the freeze-drying process and shorten the production time, and the obtained product has the advantages of good structural stability, high porosity, and low tap density; at the same time, the production process is simple and the operation It is convenient, low in cost, superior in performance, broad in prospect and suitable for mass production. Going further:

[0034] In terms of technology, using this method to treat graphene-based materials can increase the drying surface area of ​​the material to be dried, and increase the freeze-drying rate by 45% to 100%; There is a risk of explosion.

[0035] In t...

Embodiment 1

[0060] A preparation method of graphene airgel powder, comprising the following steps:

[0061] 2kg10mg / mL graphene oxide slurry was frozen at -40°C to make ice cubes to obtain frozen samples; the frozen samples were crushed in the cold storage, and the crushed ice slag could be sieved through a 10-mesh sieve. Put the sieved smoothie into the tray of the freeze dryer, and dry it with gradient temperature rise under the vacuum degree of 20Pa, and the whole process is completed in 32 hours.

[0062] After freeze-drying, directly obtain the airgel powder material of graphene oxide, such as figure 1 As shown; the airgel material has excellent dispersibility in aqueous solution, its tap density is 12 mg / mL, and its porosity is 99.2%.

Embodiment 2

[0068] A preparation method of graphene airgel powder, comprising the following steps:

[0069] 2kg20mg / mL graphene slurry was frozen at -40°C to make ice cubes to obtain frozen samples; the frozen samples were crushed in the cold storage, and the crushed ice slag could be sieved through a 10-mesh sieve. The sieved smoothie is put into the tray of the freeze dryer, under the condition of vacuum degree of 30Pa, the gradient temperature rises and dries, and the whole drying time is 18h.

[0070] The airgel powder material of graphene is directly obtained after freeze-drying, and its corresponding microstructure is as follows: figure 2 Shown; its tap density is 21mg / mL, and the porosity is 99%. .

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Abstract

The invention belongs to the technical field of functional materials, relates to the preparation of aerogel, and particularly relates to a preparation method of graphene aerogel powder and the graphene aerogel powder. The preparation method of the graphene aerogel powder comprises the following steps: firstly freezing graphene-based slurry or dispersion liquid, thus obtaining a frozen sample; thencrushing and screening the frozen sample at a low temperature, thus obtaining iced particles; and freeze drying the iced particles, thus obtaining the graphene aerogel powder. By virtue of the method, the explosion danger in the process of crushing the graphene oxide aerogel can be avoided, the drying speed in the freeze drying process can be increased, and the preparation method has the advantages of simplicity, safety and easiness in amplification.

Description

technical field [0001] The invention belongs to the technical field of functional materials and relates to the preparation of airgel, in particular to a preparation method of graphene airgel powder and graphene airgel powder. Background technique [0002] Graphene airgel is a three-dimensional network structure prepared from graphene, which has the advantages of high specific surface area, high porosity, high electrical conductivity, good thermal conductivity and mechanical strength, etc. Energy storage and other aspects have shown great application potential. Graphene airgel is generally made of graphene oxide aqueous solution as raw material, and graphene airgel is obtained by hydrothermal or chemical reduction methods, and then freeze-drying or supercritical drying. [0003] Freeze-drying is a drying technology that has developed rapidly and been widely used in recent years. This technology freezes materials below the freezing point of water, sublimates solid ice into w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C01B32/198
CPCC01B2204/20C01B2204/32C01P2004/03
Inventor 赖斌陈武峰陈建慧张晓平
Owner 昂星新型碳材料常州有限公司
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