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High-strength flexible graphene composite heat conduction film and preparation method thereof

A technology of flexible graphite and graphene film, applied in the direction of graphene, chemical instruments and methods, carbon compounds, etc., can solve the problems of ambiguity in flexibility, application limitations, and insufficient size of graphene oxide, and achieve wide application potential and enhanced strength , Improve the effect of electrical and thermal conductivity

Active Publication Date: 2016-07-06
ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But at present, the size of graphene oxide itself is insufficient, and it contains a lot of fragments, so that it has not been developed enough in thermal conductivity, and its thermal conductivity is limited to 1400W / mK, which cannot meet the needs of rapid technological development.
Moreover, the lack of film structure design makes its flexibility unclear, which limits its application in flexible devices.
More importantly, the strength of graphene thermal film is less than 80MP, which greatly limits its application

Method used

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  • High-strength flexible graphene composite heat conduction film and preparation method thereof
  • High-strength flexible graphene composite heat conduction film and preparation method thereof
  • High-strength flexible graphene composite heat conduction film and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0036] Example 1: Preparation of Graphene Oxide without Fragmentary Super Large Sheets

Embodiment 1-1

[0038] (1) Slowly add potassium permanganate into the rapidly stirring concentrated sulfuric acid at -10°C. After fully dissolving, add graphite, stir slowly at 60 rpm for 2 hours, then stop stirring. Reaction 6h, obtain the graphite oxide crystal of wide distribution respectively; As figure 1 As shown, there are more fragments in the graphite oxide wafers obtained under the two temperatures, which makes its corresponding graphene oxide also have a lot of fragments ( figure 2 ).

[0039] (2) The reaction solution obtained in step 1 is diluted with concentrated sulfuric acid (the dilution factor can be any multiple, and the present embodiment is diluted about 10 times), and the graphite oxide crystals are filtered out with a titanium alloy mesh sieve with a 150um aperture (140 mesh) (Reaction solution recovery), and slowly pour into rapidly stirred ice water relative to 10 times the volume of the filtered product, leave standstill for 2h, slowly add H 2 o 2 , to remove the ...

Embodiment 1-2

[0042] Slowly add potassium permanganate into the rapidly stirring concentrated sulfuric acid at -10°C. After fully dissolving, add graphite, stir slowly at 60 rpm for 2 hours, stop stirring, and react at low temperature (0°C,) for 48 hours. Obtain the reaction solution; the reaction solution is diluted with concentrated sulfuric acid with a mass fraction of more than 98% and dilute sulfuric acid with a mass fraction of 10% respectively, and then the graphite oxide crystals are filtered out with a titanium alloy mesh sieve with a 150um aperture (recovery of the reaction solution), and slowly poured into rapidly stirred ice water 10 times the volume of the filtered product, let it stand for 2h, and slowly added H 2 o 2 , to remove excess potassium permanganate in the reaction, add an appropriate amount of hydrochloric acid until the flocculent graphite oxide disappears, and then filter out the graphite oxide wafers with a titanium alloy mesh sieve; slowly shake and wash the sha...

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Abstract

The invention discloses a high-strength flexible graphene composite heat conduction film and a preparation method thereof. The film is formed by physically cross-linking macroscopic multi-layer folded graphene with micro-scale folds, wherein slice layers can slip, so that the film has extremely high flexibility. The graphene slice layers are perfect in structure, and slice-layer crystalline areas of the graphene slice layers are extremely great and have less defects, so that the graphene slice layers are compact in structure after being pressed under high pressure, and have extremely high conductivity and heat conduction. Meanwhile, in the presence of polymer based composites, the graphene slice layers can be cross-linked, so that the strength of the graphene film is strengthened. The high-strength flexible graphene composite heat conduction film has strength which can be up to 100-300MP, can be resistant to repeated bending by more than 1000 times, has elongation at break of 6-16%, has electric conductivity of 6000-8600S / cm, has thermal conductivity of 1400-1800W / mk, and can be widely used for high-strength designable heat-conduction and conductive apparatuses.

Description

technical field [0001] The invention relates to a novel heat-conducting material and a preparation method thereof, in particular to an ultra-flexible high-heat-conduction graphene film and a preparation method thereof. Background technique [0002] In 2010, two professors Andre Geim and Konstantin Novoselov from the University of Manchester won the Nobel Prize in Physics for their first successful separation of stable graphene, which set off a worldwide wave of research on graphene. Graphene has excellent electrical properties (electron mobility at room temperature can reach 2×10 5 m 2 / Vs), outstanding thermal conductivity (5000W / (MK), extraordinary specific surface area (2630M 2 / g), its Young's modulus (1100GPa) and breaking strength (125GPa). The excellent electrical and thermal conductivity of graphene completely exceeds that of metals. At the same time, graphene has the advantages of high temperature resistance and corrosion resistance, and its good mechanical prope...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/04C01B2204/22C01B2204/24C01B2204/32
Inventor 高超彭蠡孙海燕杨清
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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