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Graphene dispersion liquid and method for preparing graphene material power

A graphene dispersion liquid and graphene technology, applied in the field of graphene materials, can solve problems affecting the industrial application of graphene material powders, failure to obtain graphene material powders, hardening or agglomeration of graphene materials, etc., and achieve shortening Drying time, reduce drying energy consumption, solve the effect of agglomeration

Inactive Publication Date: 2014-10-01
NINGBO MORSH TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in practical applications, it is difficult to directly dry the graphene water-based slurry. When the graphene water-based slurry is dried by direct heating, the graphene material therein will harden or agglomerate so that the graphene material powder cannot be obtained or obtained. There is no graphene material powder that can be used industrially, which affects the industrial application of graphene material powder

Method used

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  • Graphene dispersion liquid and method for preparing graphene material power

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[0020] A graphene dispersion liquid provided by an embodiment of the present invention includes an organic solvent and a graphene material dispersed in the organic solvent. The graphene dispersion is made by adding an organic solvent that can form an azeotropic system with water in the graphene aqueous slurry, and displacing the water in the graphene aqueous slurry by the organic solvent and heating to completely remove the water in the graphene aqueous slurry. obtained from water. Specifically, its preparation method may include the following steps:

[0021] Step 1: providing a graphene water-based slurry, the graphene water-based slurry includes graphene material and water. The so-called graphene aqueous slurry means that the slurry is basically composed of graphene material and water. Preferably, the mass concentration of the graphene is 0.1%-5%. If the concentration is greater than 5%, the graphene material in the graphene water-based material is easy to agglomerate; and...

Embodiment 1

[0036] Get 1Kg mass concentration and be 0.1% graphene water-based slurry, according to graphene water-based slurry and organic solvent mass ratio is 1:5 and takes 5Kg toluene and joins in above-mentioned graphene water-based slurry, mixes and is mixed with intermediate slurry; The intermediate slurry is heated and dried under the condition of greater than or equal to the azeotropic temperature, and the graphene slurry initially dispersed in the organic solvent toluene is obtained after the moisture is removed, and the graphene slurry is ultrasonically stripped to obtain a dispersed Graphene dispersion. The graphene dispersion liquid was heated and dried at 120° C. until the solvent was completely removed to obtain a graphene material powder.

Embodiment 2

[0038] Get 1Kg mass concentration and be 5% graphene water-based slurry, take 4Kg toluene and join in the above-mentioned graphene water-based slurry according to the mass ratio of graphene water-based slurry and organic solvent as 1:4, mix evenly and be mixed with intermediate slurry; The intermediate slurry is heated and dried under the condition of greater than or equal to the azeotropic temperature, and the graphene slurry initially dispersed in the organic solvent toluene is obtained after the moisture is removed, and the graphene slurry is ultrasonically stripped to obtain a dispersed Graphene dispersion. The graphene dispersion liquid was heated and dried at 120° C. until the solvent was completely removed to obtain a graphene material powder.

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Abstract

The invention provides a graphene dispersion liquid which comprises an organic solvent and a graphene material dispersed in the organic solvent, wherein the graphene dispersion liquid is prepared by virtue of the following steps: S1, providing a graphene water-based slurry which comprises the graphene material and water; S2, adding the organic solvent once or multiple times into the graphene water-based slurry in an accumulated manner to obtain a mixed slurry, wherein the organic solvent and the water can form an azeotropic system; S3, heating the mixed slurry till all moistures in the mixed slurry are removed, so as to obtain the graphene dispersion liquid. The invention further provides a method for preparing graphene material power by using the graphene dispersion liquid.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to a graphene dispersion liquid which is convenient for drying and a method for preparing graphene material powder by using the graphene dispersion liquid. Background technique [0002] Graphene is a two-dimensional material with a single-layer sheet structure composed of carbon atoms and a thickness of only one carbon atom. Graphene has shown excellent performance in many aspects. For example, graphene is almost completely transparent, absorbing only 2.3% of light, and its light transmission is very good; the thermal conductivity of graphene is as high as 5300W / m K, which is greater than that of carbon. Nanotubes and diamonds; the electron mobility of graphene at room temperature exceeds 15,000 cm 2 / V s, greater than carbon nanotubes and silicon crystals; the resistivity of graphene is only 10 -6 Ω·cm, lower than copper or silver, is currently the material with the sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 刘兆平周旭峰唐长林秦志鸿胡建国赵永胜
Owner NINGBO MORSH TECH
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