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Graphene and preparation method thereof

A technology of graphene and graphite powder, which is applied in the field of graphene and its preparation, can solve the problems of graphene product ratio to be improved and low grinding disc efficiency, and achieve the effects of improving stripping efficiency, reducing wear and shortening reaction time

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grinding disc can directly achieve the effect of shearing and peeling at the same time, but the efficiency of the grinding disc is too low, and the ratio of graphene products with layers less than 10 layers needs to be improved

Method used

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  • Graphene and preparation method thereof
  • Graphene and preparation method thereof
  • Graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] use figure 1 The shown kettle 1 (emulsifying machine) and kettle 2 (with a grinding disc and a closed device inside) are connected in series, and 100 g of 32-mesh flake graphite powder (purchased from Qingdao Jintao Graphite Co., Ltd.) is ultrasonically cleaned (washed once with water, ethanol wash 2 times) to remove heterogeneous substances and impurity elements, then place the flake graphite in kettle 1, seal kettle 1 well, heat the temperature in kettle 1 to 55°C, and pump 2.5kg of CO 2 Raise the pressure in kettle 1 to 12.0 MPa, set the stirring speed of kettle 1 at 2800 rpm, and stir for 4 hours. Use the pressure difference to transfer the mixture in kettle 1 to kettle 2, control the temperature in kettle 2 to 55°C, and supplement CO 2 Make the pressure inside the kettle 2 be 12.0 MPa, set the rotational speed of the grinding disc at 1500 rpm, and grind for 8 hours. Then use the pressure difference to transfer the mixture in kettle 2 to kettle 1, control the temp...

Embodiment 2

[0064] Using a device connected in series between kettle 1 (emulsifier) ​​and kettle 2 (with a grinding disc and closed equipment inside), 200 g of 32-mesh flake graphite powder was ultrasonically cleaned (washed once with water, washed twice with ethanol) to remove heterogeneous substances and impurities element, then place the flake graphite in kettle 1, seal kettle 1 well, heat the temperature inside kettle 1 to 40°C, and pump 2.8kg of CO 2 Raise the pressure in Kettle 1 to 10.0 MPa, set the stirring speed of Kettle 1 to 1500 rpm, and stir for 8 hours. Use the pressure difference to transfer the mixture in kettle 1 to kettle 2, control the temperature in kettle 2 to 40°C, and supplement CO 2 Make the pressure in the kettle 2 be 10.0 MPa, set the rotational speed of the grinding disc at 1000 rpm, and grind for 10 hours. Then use the pressure difference to transfer the mixture in kettle 2 to kettle 1, control the temperature in kettle 1 to 40°C, and supplement CO 2 Make the...

Embodiment 3

[0067] Using a device connected in series between kettle 1 (emulsifier) ​​and kettle 2 (with a grinding disc inside and a closed device), 400 g of 32-mesh flake graphite powder was ultrasonically cleaned (washed once with water, washed twice with ethanol) to remove heterogeneous substances and impurities element, then place the flake graphite in kettle 1, seal kettle 1 well, heat the temperature in kettle 1 to 70°C, and pump 2.2kg of CO 2 Raise the pressure in Kettle 1 to 16.0 MPa, set the stirring speed of Kettle 1 to 3500 rpm, and stir for 2 hours. Use the pressure difference to transfer the mixture in kettle 1 to kettle 2, control the temperature in kettle 2 to 70°C, and supplement CO 2 Make the pressure inside the kettle 2 be 16.0 MPa, set the rotational speed of the grinding disc at 2000 rpm, and grind for 4 hours. Then use the pressure difference to transfer the mixture in kettle 2 to kettle 1, control the temperature in kettle 1 to 70°C, and supplement CO 2 Make the p...

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Abstract

The invention discloses graphene and a preparation method thereof. The graphene is prepared through a mechanical stripping method, and the ratio of the number of layers of the graphene is not less than 50%, wherein the number of layers of the graphene is less than 10. By adopting the method disclosed by the invention, high-quality graphene can be efficiently prepared, and the preparation process is green and environment-friendly.

Description

technical field [0001] The invention relates to graphene and a preparation method thereof. Background technique [0002] The excellent properties of graphene have broad application prospects in the fields of sensors, electronic components, biomedicine and so on. The preparation of graphene has also become a hot research topic. At present, the main methods for preparing graphene include redox method, liquid phase exfoliation method and vapor phase deposition method. Among them, the redox method uses graphite as a raw material, oxidizes graphite with strong oxidants such as concentrated sulfuric acid and potassium permanganate to obtain graphene oxide, and then reduces graphene oxide to graphene by high temperature or chemical methods. The method is the most common method at present, and it is also the most mass-produced in the industry at present. However, due to the fact that the graphene produced after being oxidized by a strong oxidant has many defects, even after reduct...

Claims

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Application Information

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IPC IPC(8): C01B32/182C01B32/19
CPCC01B32/182C01B32/19C01B2204/04C01B2204/32Y02P20/54
Inventor 王湘戚桂村曾宪忠陈翔姜超李秉海宋志海茹越张江茹赵月云张晓红
Owner CHINA PETROLEUM & CHEM CORP
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