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Method of continuously preparing high-quality graphene in a large scale

A graphene, high-quality technology, applied in the field of continuous large-scale preparation of high-quality graphene, can solve the problems of many graphene defects, long production cycle, high cost, etc., and achieve simple preparation process, complete sheet structure, and effective exfoliation Effect

Inactive Publication Date: 2017-08-15
拜永孝
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have certain disadvantages: the chemical redox process is complex, the obtained graphene has many defects and low conductivity, and the waste liquid will seriously pollute the environment; the utilization rate of graphene in the electrochemical stripping process is low, and graphite Oxidation of alkene is serious, the output is low, and the power loss is large; although chemical vapor deposition can produce high-quality graphene, the production cycle is too long and the cost is extremely high, which hinders the industrial application of graphene and is difficult to meet the growing market demand; Compared with the above methods, the preparation of graphene by physical exfoliation is currently the most promising method for industrial application
The invention patent pointed out that the graphene microflakes obtained by this method are mainly used in the fields of plastic reinforcement, rubber reinforcement, anti-corrosion coatings, etc. Obviously, there is no possibility of application in the field of graphene intrinsic properties such as conductivity

Method used

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  • Method of continuously preparing high-quality graphene in a large scale
  • Method of continuously preparing high-quality graphene in a large scale

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 A method for continuously preparing high-quality graphene on a large scale, comprising the following steps:

[0041] (1) Mix a total of 1000 g of the carbon source - flake graphite with a particle size of 20 μm and the surface isolation synergistic stabilizer - polyacrylamide at a volume ratio of 100:1 to obtain a mixture.

[0042] (2) Disperse the mixture in 6000mL of liquid medium—a mixture of water and ethanol (molar ratio 1:1), and place it in a ball mill at a temperature of 60°C for grinding and peeling. After 5 hours, a graphene dispersion is obtained, which can be Apply directly to liquid systems.

[0043] Wherein: the ball mill refers to a vertical sand mill, and the peeling speed is 4000rpm. The internal structure of the ball mill is a rod tip type, and the built-in grinding ball refers to an alumina ball with a diameter of 0.05mm~1mm.

[0044] (3) For environments that require graphene powder, the graphene dispersion can be spray-dried to obtain...

Embodiment 2

[0046] Embodiment 2 A method for continuously preparing high-quality graphene on a large scale, comprising the following steps:

[0047] (1) Mix 800 g of carbon source - dense crystalline graphite with a particle size of 1 mm and surface isolation synergistic stabilizer - gum arabic and sucrose (volume ratio 1:1) in a volume ratio of 1:1 to obtain a mixture.

[0048] (2) Disperse the mixture in 5000mL of liquid medium—water, and place it in a ball mill at a temperature of 40°C for grinding and peeling. After 3 hours, a graphene dispersion is obtained, which can be directly applied to a liquid system.

[0049] Wherein: the ball mill refers to a horizontal sand mill, and the peeling speed is 2000rpm. The internal structure of the ball mill is disc type, and the built-in grinding balls are zirconia balls with a diameter of 0.05mm~1mm.

[0050] (3) For environments that require graphene powder, the graphene dispersion can be dried under normal pressure to obtain graphene powder. ...

Embodiment 3

[0052] Embodiment 3 A method for continuously preparing high-quality graphene on a large scale, comprising the following steps:

[0053] (1) Mix 1000 g of carbon source—cryptocrystalline graphite with a particle size of 50 μm and surface isolation synergistic stabilizer—hydroxyethyl cellulose in a volume ratio of 30:1 to obtain a mixture.

[0054] (2) Disperse the mixture in 3000mL of liquid medium—water, and put it in a ball mill for grinding and peeling at a temperature of 50°C. After 0.5h, a graphene dispersion is obtained, which can be directly applied to a liquid system.

[0055] Wherein: the ball mill refers to a horizontal sand mill, and the peeling speed is 4000rpm. The internal structure of the ball mill is a combination of pins and discs, and the built-in grinding balls are zirconium silicate balls with a diameter of 0.05mm~10.mm.

[0056] (3) For environments that require graphene powder, the graphene dispersion is dried under reduced pressure to obtain graphene po...

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Abstract

The invention relates to a method of continuously preparing high-quality graphene in a large scale. The method comprises the following steps of: (1) uniformly mixing a carbon source and a surface isolation synergistic stabilizer according to a proportion, so as to obtain a mixture; (2) dispersing the mixture in a liquid medium, then grinding and stripping in a ball mill, and obtaining a graphene dispersion liquid after 0.5-5 hours; and (3) drying the graphene dispersion liquid so as to obtain graphene powder. The method is simple, is low in cost, can prepare non-aggregated graphene, can realize industrial continuous production, and has a broad application prospect in the electricity field.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for continuous large-scale preparation of high-quality graphene. Background technique [0002] Graphene is the strongest material known to science. Since the carbon atoms in graphene adopt sp2 hybridization, which is larger than the s orbital component in sp3 hybridization, this special two-dimensional structure leads to graphene showing various special properties, such as high strength, high hardness, High thermal and electrical conductivity. In recent years, methods for preparing graphene have emerged. [0003] At present, the commonly used methods for preparing graphene materials include chemical redox method, electrochemical exfoliation method, chemical vapor deposition method and physical exfoliation method. However, these methods have certain disadvantages: the chemical redox process is complex, the obtained graphene has many defects and low conductivity, and t...

Claims

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Application Information

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IPC IPC(8): C01B32/19
CPCC01B2204/02C01B2204/22C01B2204/30C01P2002/82
Inventor 拜永孝马宇
Owner 拜永孝
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