Flexible and electrically insulating fluorinated graphene heat-conducting composite film as well as preparation and application thereof

A fluorinated graphene, thermally conductive composite technology, applied in chemical instruments and methods, heat exchange materials and other directions, can solve the problems of non-insulation and poor thermal conductivity of graphene films, and achieve good electrical insulation and flexibility, and production costs. Low, enhanced effect of interaction between layers

Active Publication Date: 2019-06-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a flexible, electrically insulating fluorinated graphene thermally conductive composite film and its preparation and application, to overcome the defects of poor thermal conductivity of the boron nitride composite film obtained in the prior art and non-insulation of the graphene film , the structural relationship of the fluorinated graphene heat-conducting composite film obtained in this invention is that the polyvinyl alcohol molecular chains are distributed between the fluorinated graphene nanosheets arranged in an orderly orientation and play the role of bonding adjacent sheets. This structure Endows the composite film with high in-plane thermal conductivity, good electrical insulation and bendability

Method used

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  • Flexible and electrically insulating fluorinated graphene heat-conducting composite film as well as preparation and application thereof
  • Flexible and electrically insulating fluorinated graphene heat-conducting composite film as well as preparation and application thereof
  • Flexible and electrically insulating fluorinated graphene heat-conducting composite film as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Disperse commercial fluorinated graphite powder in isopropanol, ultrasonicate on a water bath ultrasonic instrument for 24h (250W), and then centrifuge the mixed dispersion at 3000rpm for 10min to obtain exfoliated fluorinated graphene nanosheets.

[0039] (2) Take by weighing 40mg of fluorinated graphene obtained in step (1) and disperse it in 200ml water, add 0.05ml 6wt% polyvinyl alcohol (molecular weight 145kg / mol) aqueous solution, ultrasonic 30min, obtain evenly dispersed fluorinated graphene liquid; then pour the dispersion into the vacuum filtration device mixed with cellulose acetate filter membrane, so that the fluorinated graphene nanosheets are uniformly deposited layer by layer to obtain an anisotropic composite graphene thermal film, which is estimated by thermogravimetric analysis. The fluorinated graphene content under the condition is 93wt%.

[0040] Transmission electron microscope image of fluorinated graphene figure 1 As shown, it is shown that...

Embodiment 2

[0043] (1) Disperse commercial fluorinated graphite powder in isopropanol, ultrasonicate on a water bath ultrasonic instrument for 24h (250W), and then centrifuge the mixed dispersion at 3000rpm for 10min to obtain exfoliated fluorinated graphene nanosheets.

[0044] (2) Take by weighing 40mg of fluorinated graphene obtained in step (1) and disperse it in 200ml water, add 0.1ml 6wt% polyvinyl alcohol (molecular weight 145kg / mol) aqueous solution, ultrasonic 30min, obtain evenly dispersed fluorinated graphene liquid; then pour the dispersion into a mixed cellulose acetate filter membrane decompression filtration device, so that the fluorinated graphene nanosheets are uniformly deposited layer by layer to obtain an anisotropic composite graphene thermal conductivity film, which is estimated by thermogravimetric analysis. The lower fluorinated graphene content was 88.6 wt%.

Embodiment 3

[0046] (1) Disperse commercial fluorinated graphite powder in isopropanol, ultrasonicate on a water bath ultrasonic instrument for 24h (250W), and then centrifuge the mixed dispersion at 3000rpm for 10min to obtain exfoliated fluorinated graphene nanosheets.

[0047] (2) Take by weighing 40mg of fluorinated graphene obtained in step (1) and disperse it in 200ml water, add 0.2ml 6wt% polyvinyl alcohol (molecular weight 145kg / mol) aqueous solution, ultrasonic 30min, obtain evenly dispersed fluorinated graphene liquid; then pour the dispersion into a mixed cellulose acetate filter membrane decompression filtration device, so that the fluorinated graphene nanosheets are uniformly deposited layer by layer to obtain an anisotropic composite graphene thermal conductivity film, which is estimated by thermogravimetric analysis. The lower fluorinated graphene content was 81.8wt%.

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Abstract

The invention relates to a flexible and electrically insulating fluorinated graphene heat-conducting composite film as well as preparation and an application thereof. The composite film comprises fluorinated grapheme nanosheets and polyvinyl alcohol. The preparation comprises the following steps: uniform dispersion of polyvinyl alcohol / fluorinated graphene is treated with a decompression-assistedfiltering film forming method to enable the fluorinated graphene nanosheets to be orderly stacked on a base film. The fluorinated graphene composite film obtained with the method not only has high in-plane thermal conductivity, but also maintains good electrical insulation and bendability, thereby having potential application value in future thermal management of flexible electronic devices. The method is convenient to operate, has relatively simple preparation conditions and low production cost, facilitates batch production and large-scale production, and has good industrial production foundation and broad application prospect.

Description

technical field [0001] The invention belongs to the field of heat-conducting composite film and its preparation and application, in particular to a flexible, electrically insulating fluorinated graphene heat-conducting composite film and its preparation and application. Background technique [0002] In the past ten years, the rapid development of various portable devices (mobile phones, tablet computers and other smart devices, etc.) towards multi-functionality, thinner and bendable has greatly improved the integration, miniaturization and flexibility of the electronic components inside. Higher power and other indicators put forward higher requirements. In this case, the increase of heat flow per unit area is bound to bring about serious heat dissipation problems, which in turn are closely related to the lifetime and operational reliability of electronic devices. Using anisotropic thermally conductive films with high in-plane thermal conductivity, good electrical insulation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K3/04C08J5/18C09K5/14
Inventor 武培怡王雄伟
Owner DONGHUA UNIV
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