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Method for preparing graphene heat dissipation film by using self-propagating stripping technology

A ene heat dissipation film and self-propagating technology, applied in the field of graphene, can solve the problems of low yield of large-scale graphene oxide, small size of graphene oxide sheet, low thermal conductivity of graphene film, etc., to achieve excellent heat dissipation effect, The effect of large size and high single-layer rate

Active Publication Date: 2020-05-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process has the following defects: 1. Ultrasonic and shear peeling result in small graphene oxide sheet size and low thermal conductivity of graphene film; 2. Centrifugal classification method has cumbersome steps, low yield of large-sized graphene oxide, and low production efficiency. Disadvantages; 3. The atmosphere used in the heat treatment process is heated, and the heat is transferred from the surface of the graphite oxide film to the inside, resulting in bubbling caused by uneven decomposition of internal and external functional groups. The heating rate is controlled at 1-3°C / min, and the heat treatment efficiency is low.
In this way, graphite oxide is dried and exfoliated into few-layer graphene powder. The disadvantage is redispersion. The re-drying process has high exfoliation temperature and high energy consumption. After thermal exfoliation, the product has poor dispersibility, which is not conducive to subsequent slurry. disadvantages of preparation

Method used

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  • Method for preparing graphene heat dissipation film by using self-propagating stripping technology
  • Method for preparing graphene heat dissipation film by using self-propagating stripping technology
  • Method for preparing graphene heat dissipation film by using self-propagating stripping technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Graphite oxide with an average particle size of 1000 μm is prepared with water into a uniform dispersion with a mass fraction of 5%, and ammonia water is used to chemically modify the graphite oxide aqueous dispersion. The amount of modifier used is 0.1 times the mass of graphite oxide, and then vacuum Disperser, under the vacuum assistance of -0.1MPa, slowly stir and homogenize at a linear speed of 5m / s until the bubbles are completely removed, and obtain a modified graphite oxide slurry;

[0037]2) Use a scraper to evenly coat the modified graphite oxide slurry on a water-permeable nylon cloth to form a 4mm graphite oxide film, dry at 30°C to remove moisture, and peel off the substrate to obtain a modified graphite oxide film with a film thickness of 200 μm;

[0038] 3) After heating the modified graphite oxide film in step 2) on a rolling heating platform at 80°C, then lead it to a carbon fiber quartz electric heating tube heating platform for self-propagating peel...

Embodiment 2

[0047] 1) Graphite oxide with an average particle size of 400 μm is prepared with water into a uniform dispersion with a mass fraction of 1%, and ammonia water is used to chemically modify the graphite oxide aqueous dispersion. The amount of modifier used is 0.2 times the mass of graphite oxide, and then vacuum Disperser, under the vacuum assistance of -0.1MPa, slowly stir and homogenize at a linear speed of 1m / s until the bubbles are completely removed, and obtain a modified graphite oxide slurry;

[0048] 2) Use a scraper to evenly coat the modified graphite oxide slurry on a water-permeable nylon cloth to form a 1mm graphite oxide film, dry at 40°C to remove moisture, and peel off the substrate to obtain a modified graphite oxide film with a film thickness of 10 μm;

[0049] 3) After the modified graphite oxide film in step 2) is heated in a rolling heating platform at 50°C, it is then introduced to a carbon fiber quartz electric heating tube heating platform for self-propag...

Embodiment 3

[0053] 1) Graphite oxide with an average particle size of 100 μm is prepared with water into a uniform dispersion with a mass fraction of 3%, and ammonia water is used to chemically modify the graphite oxide aqueous dispersion. The amount of modifier used is 0.3 times the mass of graphite oxide, and then vacuum Disperser, under the vacuum assistance of -0.1MPa, slowly stir and homogenize at a linear speed of 3m / s until the air bubbles are completely removed to obtain a modified graphite oxide slurry;

[0054] 2) Use a scraper to evenly coat the modified graphite oxide slurry on a water-permeable nylon cloth to form a 5mm graphite oxide film, dry at 50°C to remove moisture, and peel off the substrate to obtain a modified graphite oxide film with a film thickness of 150 μm;

[0055] 3) Heat the modified graphite oxide film in step 2) on a rolling heating platform at 100°C, and then lead it to a metal tubular electric heating tube heating platform for self-propagating exfoliation ...

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Abstract

The invention relates to the technical field of graphene, and aims to provide a method for preparing a graphene heat dissipation film by using a self-propagating stripping technology. The method comprises the following steps: carrying out chemical modification on a graphite oxide dispersion liquid by using hydrogen peroxide or ammonia water, and carrying out homogenizing and defoaming under vacuum; coating water-permeable nylon cloth with modified graphite oxide slurry obtained in the previous step to form a graphite oxide film; drying the graphite oxide film and stripping a substrate to obtain a modified graphite oxide film; after heating, carrying out self-propagating stripping to obtain a few-layer stripped graphene film; carrying out firing in an inert atmosphere, and performing cooling to obtain graphene foam; and conducting rolling to form a film, and carrying out trimming post-treatment to obtain the graphene heat dissipation film. The graphite oxide film is uniformly heated, uneven decomposition of functional groups can be avoided, and pretreatment efficiency is improved. The graphene is high in single-layer rate and large in size; the graphene film is excellent in heat conduction performance, high in strength and better in heat dissipation effect. Any toxic and harmful chemical reagent is not adopted, the preparation process is simple, and efficient and high-quality reduction of the graphite oxide film is realized.

Description

technical field [0001] The invention belongs to the technical field of graphene, and in particular relates to a method for preparing a graphene heat dissipation film by using a self-propagating stripping technology. Background technique [0002] Graphene is a two-dimensional nano-carbon material, composed of carbon atoms arranged in a honeycomb shape, with a thickness of only 0.335nm. It has excellent thermal properties, mechanical properties and flexibility, and its thermal conductivity can reach 5300-6000W / (m·K ), the tensile strength reaches 130GPa, and the Young's modulus reaches 1.0TPa. It has been widely used in the field of thermal management in recent years. [0003] Graphene heat dissipation film is composed of graphene layer stacks, which has excellent thermal conductivity and mechanical properties. The surface thermal conductivity of graphene heat dissipation film measured by laser flash method (LFA) can reach 500-1500W / (m K), while the radial thermal conductivit...

Claims

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Application Information

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IPC IPC(8): C01B32/192C01B32/194C01B32/184C04B30/00C04B111/94
CPCC01B32/192C01B32/184C01B32/194C04B30/00C01B2204/32C01B2204/22C01B2204/24C01B2204/26C01B2204/02C01B2204/04C04B2201/50C04B2201/32C04B2111/94C04B2201/20C04B14/022Y02P20/10
Inventor 暴宁钟翁程杰张玲洁李畅
Owner NANJING UNIV OF TECH
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