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Method for continuously producing graphene aerogel microspheres

A graphene aerogel, graphene wet gel microsphere technology, applied in graphene, chemical instruments and methods, nano-carbon and other directions, can solve problems such as poor production continuity

Active Publication Date: 2019-09-20
ZHONGSU NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is suitable for laboratory-scale production of graphene airgel microspheres, and the production continuity is poor

Method used

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  • Method for continuously producing graphene aerogel microspheres
  • Method for continuously producing graphene aerogel microspheres
  • Method for continuously producing graphene aerogel microspheres

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preparation example Construction

[0027] The preparation method of graphene oxide aerogel microspheres of the present invention includes the following steps: (1) liquid crystal solution preparation step; (2) graphene oxide microsphere preparation step; (3) wet gel microsphere preparation step; (4) ) Preparation steps of graphene aerogel microspheres. The details are described below.

[0028]

[0029] The graphene oxide is mixed with water to form a graphene oxide dispersion. The order of mixing is not particularly limited. According to one embodiment of the present invention, graphene oxide is added to water for dispersion to form a graphene oxide dispersion. According to another embodiment of the present invention, water is added to graphene oxide for dispersion to form a graphene oxide dispersion. The graphene oxide concentration in the graphene oxide dispersion may be 3-20 mg / ml, preferably 5-10 mg / ml, and more preferably 5-8 mg / ml. This is beneficial to improve the shell structure of graphene aerogel.

[0...

Embodiment 1

[0050] (1) Disperse graphene oxide in 10000 ml of deionized water to obtain a graphene oxide dispersion with a concentration of 5 mg / ml. Add 56 g of potassium hydroxide to the graphene oxide dispersion liquid, and ultrasonically disperse for 5 minutes to form a graphene oxide liquid crystal solution.

[0051] (2) The graphene oxide liquid crystal solution is placed in the slurry supply device 2, and the pressure supply device 1 is used to apply pressure so that the pressure of the slurry supply device 2 is 0.02 MPa, and the graphene oxide liquid crystal solution is passed through the splitter 3 (the number is 2 The number of outlets of the splitter is 10, the caliber is 2mm) is supplied to the container 4 containing the calcium chloride coagulation bath (5wt% calcium chloride aqueous solution), and it is allowed to stand for 10 minutes, and the graphene oxide microspheres sink into the container 4 At the bottom, drain the coagulation bath and add a large amount of deionized water...

Embodiment 2

[0056] (1) Disperse graphene oxide in 10000 ml of deionized water to obtain a graphene oxide dispersion with a concentration of 6 mg / ml. Add 56 g of potassium hydroxide to the graphene oxide dispersion liquid, and ultrasonically disperse for 5 minutes to form a graphene oxide liquid crystal solution.

[0057] (2) Place the graphene oxide liquid crystal solution in the slurry supply device, use the pressure supply device to apply pressure so that the pressure of the slurry supply device is 0.02MPa, and pass the graphene oxide liquid crystal solution through the splitter (the number is 2, the splitter The number of outlets is 10, the caliber is 2mm) is supplied to the calcium chloride coagulation bath (5wt% calcium chloride aqueous solution), and it is allowed to stand for 10 minutes. The graphene oxide microspheres sink to the bottom of the container. Pour out the coagulation bath and add a large amount Clean with deionized water.

[0058] (3) Add graphene oxide microspheres to 4g / ...

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Abstract

The invention discloses a method for continuously producing graphene aerogel microspheres. The method comprises the following steps: mixing graphene oxide and water to form a graphene oxide dispersion liquid with a concentration of 3-20 mg / ml, mixing an alkali metal hydroxide and the graphene oxide dispersion liquid, and performing ultrasonic dispersion to obtain a graphene oxide liquid crystal solution; placing the graphene oxide liquid crystal solution into a slurry supply device, applying pressure by adopting a pressure supply device, supplying the graphene oxide liquid crystal solution to a calcium chloride coagulation bath through a flow divider, and allowing the obtained coagulation bath to stand for 5-30 min to obtain graphene oxide microspheres; placing the graphene oxide microspheres into a sodium ascorbate solution, and performing a reaction at 60-90 DEG C for 5-25 h to obtain graphene wet gel microspheres; and performing post-treatment on the graphene wet gel microspheres to obtain the graphene aerogel microspheres. The method provided by the invention can continuously produce the graphene aerogel microspheres.

Description

Technical field [0001] The invention relates to a method for continuously producing graphene aerogel microspheres. Background technique [0002] Graphene aerogel has attracted great attention due to its unique characteristics (such as ultra-low density, superelasticity and high surface area). Graphene aerogel has huge potential applications in energy equipment, sensors, pollution adsorbents and thermal insulation materials. [0003] At present, reports on graphene aerogels are concentrated on a single graphene aerogel, but in practical applications, it is usually necessary to collect a large number of graphene aerogels of any shape and size. Traditional aerogels have a pore structure inside and outside. A large number of graphene aerogels will aggregate and cause group effects, and the aerogels are easy to agglomerate and break. Graphene aerogel blocks can be directly applied to thermal insulation materials, adsorbent materials and other fields, but large block graphene aerogels ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B32/184C01B2204/24C01B2204/32C01B2204/20C01B32/00C01B32/194C01B32/198C01P2004/03C01P2004/32
Inventor 童裳慧
Owner ZHONGSU NEW TECH CO LTD
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