Preparation method of graphene

A technology of graphene and graphite, which is applied in the field of graphene preparation, can solve problems such as difficulty in realizing large-scale production, impact on product quality and yield, and difficulty in controlling product quality and yield, so as to achieve easy control of product quality and yield, The effect of product quality and yield is small and easy to operate

Inactive Publication Date: 2016-03-02
JIANGSU JINJU ALLOY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation methods of graphene products are diverse, but there are some disadvantages, especially in the preparation process, it is difficult to control the product quality and yield. A slight change in the processing conditions in the production process, such as changes in temperature and time, will affect the quality and yield of the product. rate has a great impact, so it is difficult to achieve large-scale production

Method used

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  • Preparation method of graphene

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Embodiment 1

[0012] A preparation method of graphene, the preparation steps are as follows: mix natural graphite flakes, pyrene and N-methylpyrrolidone evenly and then add them into the autoclave, the mass ratio of the pyrene to the natural graphite flakes is 0.1:1, the The mass ratio of N-methylpyrrolidone to natural flake graphite is 5:1. After the temperature in the autoclave reaches 32°C, the gaseous CO 2 Pump into the high pressure reactor, after the pressure in the high pressure reactor reaches 30MPa, the CO 2 The fluid reaches a supercritical state, supercritical CO 2 Start the circulating flow, and after the circulating flow time reaches 10 minutes, quickly release the pressure to normal pressure, then pump the material into the ultrasonic reactor for ultrasonic reaction, the ultrasonic power is 50W, and the ultrasonic time is 5h, and finally the material is spray-dried Graphene powder can be obtained, and the spray drying temperature is 50°C.

[0013] The above-prepared graphene...

Embodiment 2

[0015] A preparation method of graphene, the preparation steps are as follows: expandable graphite, 1-pyrene butyric acid and dimethylformamide are evenly mixed and then added to the high-pressure reactor, the mass of the 1-pyrene butyric acid and expandable graphite The ratio is 0.01:1, and the mass ratio of dimethylformamide to expandable graphite is 4:1. After the temperature in the autoclave reaches 35°C, the gaseous CO 2 Pump into the high pressure reactor, after the pressure in the high pressure reactor reaches 25MPa, the CO 2 The fluid reaches a supercritical state, supercritical CO 2 Start the circulation flow, and after the circulation flow time reaches 30 minutes, quickly release the pressure to normal pressure, repeat the pressurization and pressure relief process 3 times, and then pump the material into the ultrasonic reactor for ultrasonic reaction, the ultrasonic power is 100W, and the ultrasonic time is 4h, and finally the material is spray-dried to obtain grap...

Embodiment 3

[0018] A preparation method of graphene, the preparation steps are as follows: after mixing expanded graphite, pyrene, ethanol and N-methylpyrrolidone uniformly, add in the autoclave, the mass ratio of the pyrene to the expanded graphite is 2: 1, the The mass ratio of the total mass of ethanol and N-methylpyrrolidone to expanded graphite is 3:1. After the temperature in the autoclave reaches 50°C, the gaseous CO 2 Pump into the high-pressure reactor, after the pressure in the high-pressure reactor reaches 7.4MPa, the CO 2 The fluid reaches a supercritical state, supercritical CO 2 Start the circulation flow, and after the circulation flow time reaches 50 minutes, quickly release the pressure to normal pressure, repeat the pressurization and pressure relief process 8 times, and then pump the material into the ultrasonic reactor for ultrasonic reaction, the ultrasonic power is 500W, and the ultrasonic time is 2h, and finally the material is spray-dried to obtain graphene powder...

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Abstract

The invention discloses a preparation method of graphene. The method is simple in technology and easy to operate, and the obtained graphene is excellent in electric conduction, heat conduction and mechanical performances. With the method, the mechanical strength, heat-conducting property and anti-static function of polypropylene resin can be greatly improved, and the additional value of plastics is improved. The method belongs to physical exfoliation processes in which the treatment condition is mild and the quality of graphene cannot be damaged; and the exfoliation degree of the graphene is high through the two times of physical exfoliation processes. Therefore, the number of layers of graphene can be reduced; the yield of single-layer graphene is improved; and the high-quality graphene is finally obtained. Moreover, the influence of the preparation conditions of the method on the quality and yield of the graphene product is little; the product quality and yield are easy to control; and the method is suitable for large-scale production. Besides, the raw materials used in the method disclosed by the invention are all industrial products, and are easy to obtain and low in cost; and the production process is free of pollution.

Description

technical field [0001] The invention relates to a preparation method of graphene, which belongs to the technical field of graphene preparation. Background technique [0002] Graphene is a two-dimensional crystal composed of carbon atoms, in which carbon atoms are sp2 hybridized to form a honeycomb hexagonal planar structure. Graphene has excellent mechanical and electrical properties, and has broad application prospects in electronics, magnetism, optics, and biology. Since it was discovered by scientists from the University of Manchester in 2004, it has attracted extensive attention from researchers in the fields of physics, materials and chemistry, especially after the discoverer of graphene won the Nobel Prize in 2010, the preparation and properties of graphene And the research on application and other aspects has become a hot spot concerned by scholars from all over the world. The preparation methods of graphene products are diverse, but there are some disadvantages, es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCY02P20/54
Inventor 陈鹏金旭梁鹏吴维果吴晓金
Owner JIANGSU JINJU ALLOY MATERIAL
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