Method for rapidly preparing high-conductivity graphene electromagnetic shielding film

A technology of electromagnetic shielding film and graphene film, which is applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, electrical components, etc., can solve the problems of large energy consumption, low processing efficiency, and long preparation process of high-temperature graphitization, and achieve reduction Consumption and processing time, excellent electrical conductivity, widening the application field

Active Publication Date: 2022-04-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: the technical problem to be solved by the present invention is to provide a method for rapidly preparing a highly conductive, flexible, and high-strength graphene electromagnetic shielding film for the deficiencies in the prior art, and to solve the problem of bulging in the existing graphene film preparation process. Disadvantages such as severe bubble phenomenon, large energy consumption of high-temperature graphitization, long preparation process, and low processing efficiency

Method used

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  • Method for rapidly preparing high-conductivity graphene electromagnetic shielding film
  • Method for rapidly preparing high-conductivity graphene electromagnetic shielding film
  • Method for rapidly preparing high-conductivity graphene electromagnetic shielding film

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Experimental program
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Effect test

Embodiment 1

[0035] 1) The graphite oxide filter cake with an average size of 1000 μm is configured into an aqueous graphite oxide solution with a concentration of 20 mg / mL. Add ammonia water to the prepared solution to adjust the pH to 8, divide it in a high-speed shear disperser for 2 hours at a linear speed of 20m / s, and then use a vacuum mixer to assisted by a vacuum of -0.1MPa at a linear speed of 1m / s Stir slowly for 30 minutes to completely remove the bubbles to obtain a graphene oxide dispersion slurry;

[0036] 2) Apply the graphene oxide slurry evenly on the PET substrate to form a 2mm embryo film of graphene oxide film by doctor blade coating method, dry at 40°C for 8 hours to remove moisture, and peel off the substrate to obtain graphite oxide with a film thickness of 20 μm vinyl film;

[0037] 3) In an air environment, use an infrared lamp with a surface temperature of 400°C to irradiate the graphene oxide film in step 2) for 20 seconds, then under the protection of an argon ...

Embodiment 2

[0043] 1) The graphite oxide filter cake with an average size of 500 μm is configured into an aqueous graphite oxide solution with a concentration of 30 mg / mL. Add ammonia water to the prepared solution to adjust the pH to 8, divide it in a high-speed shear disperser for 2 hours at a linear speed of 20m / s, and then use a vacuum mixer to assisted by a vacuum of -0.1MPa at a linear speed of 1m / s Stir slowly for 30 minutes to completely remove the bubbles to obtain a graphene oxide dispersion slurry;

[0044] 2) Apply the graphene oxide slurry evenly on the PET substrate to form a 3 mm embryonic film of graphene oxide film by the doctor blade coating method, dry at 40°C for 8 hours to remove moisture, and peel off the substrate to obtain graphite oxide with a film thickness of 45 μm vinyl film;

[0045] 3) In an air environment, use an infrared lamp with a surface temperature of 400°C to irradiate the graphene oxide film in step 2) for 20 seconds, then under the protection of an...

Embodiment 3

[0048] 1) The graphite oxide filter cake with an average size of 500 μm is configured into an aqueous graphite oxide solution with a concentration of 40 mg / mL. Add ammonia water to the prepared solution to adjust the pH to 8, divide it in a high-speed shear disperser at a line speed of 10m / s for 2h, and then use a vacuum mixer to assisted by a vacuum of -0.1MPa at a line speed of 1m / s Stir slowly for 30 minutes to completely remove the bubbles to obtain a graphene oxide dispersion slurry;

[0049] 2) Apply the graphene oxide slurry evenly on the PET substrate to form a 1 mm embryo film of graphene oxide film by doctor blade coating method, dry at 40°C for 8 hours to remove moisture, and peel off the substrate to obtain graphite oxide with a film thickness of 20 μm vinyl film;

[0050] 3) In an air environment, use an infrared lamp with a surface temperature of 400°C to irradiate the graphene oxide film in step 2) for 20 seconds, then under the protection of an argon atmospher...

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Abstract

The invention discloses a method for rapidly preparing a high-conductivity graphene electromagnetic shielding film, which comprises the following steps: preparing a graphite oxide filter cake into a graphite oxide suspension, uniformly dispersing, and stirring in vacuum to remove bubbles to obtain graphene oxide dispersed slurry; uniformly coating a substrate with the obtained graphene oxide dispersion slurry to form a graphene oxide blank film, drying to remove moisture, and then stripping the substrate to obtain a graphene oxide film; in an air environment, irradiating the obtained graphene oxide film by adopting infrared rays, then heating to 1500 DEG C under the protection of an inert atmosphere, keeping the temperature for 0.5-2 hours, and naturally cooling to obtain graphene foam; and finally, calendering the graphene foam to form a film. The method provided by the invention does not generate any toxic and harmful substances, the preparation process is simple, the infrared lamp treatment is green and efficient, the heat treatment temperature is low, the temperature rise is fast, and efficient and high-quality preparation of the graphene film can be realized.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding films, in particular to a method for rapidly preparing a highly conductive graphene electromagnetic shielding film. Background technique [0002] In recent years, with the rapid development and wide application of wireless communication technology, excessive electromagnetic radiation appears around people, including public places, home environments, various buildings, etc., causing adverse effects on electronic equipment and human health. Due to its poor flexibility and high density, traditional metal-based electromagnetic shielding materials have been unable to meet the applications in micro and flexible electronic devices. There is an urgent need for ultra-thin, flexible and lightweight film materials to replace traditional metal materials. [0003] As a two-dimensional nanocarbon material, graphene has excellent thermal, electrical, mechanical and flexible properties, and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622C09K3/00H05K9/00
Inventor 暴宁钟邹凯燕克兰戚桂村张晓红吴健褚良永
Owner NANJING TECH UNIV
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