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Graphene/polyimide heat-conduction film and preparation method thereof

A technology of polyimide and graphene, applied in the field of graphene, can solve problems such as low thermal conductivity, difficult dispersion, and uncontrollable dispersion uniformity of polyamic acid

Inactive Publication Date: 2020-07-07
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of graphene / polyimide composite film uses graphene oxide as a raw material, which is costly and difficult to disperse, and the dispersion uniformity of polyamic acid in it after mixing is also uncontrollable, and a large amount of organic solvents are required. High pollution, resulting in low thermal conductivity

Method used

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  • Graphene/polyimide heat-conduction film and preparation method thereof
  • Graphene/polyimide heat-conduction film and preparation method thereof

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preparation example Construction

[0036] Such as figure 1 As shown, the embodiment of the present application provides a method for preparing a graphene / polyimide thermally conductive film, which includes the following steps:

[0037]Step 1, a) prepare the polyamic acid nanoemulsion taking water as medium:

[0038] The polyamic acid nanoemulsion can be directly used as a finished product, or can be self-made.

[0039] Emulsion refers to the dispersion system in which the dispersed phase is dispersed in the continuous phase composed of another phase (non-solvent) in the form of tiny droplets. According to the size of the dispersed phase, it can be divided into microemulsion and nanoemulsion.

[0040] The preparation methods of nanoemulsions include: high-energy emulsification method and low-energy emulsification method. The high-energy emulsification method refers to the use of high-speed stirrers, high-pressure homogenizers, ultrasonic generators and other mechanical equipment to provide energy to nanonize t...

Embodiment 1

[0059] This embodiment provides a graphene / polyimide thermally conductive film, which is prepared according to the following preparation method:

[0060] Step 1, a) prepare the polyamic acid nanoemulsion taking water as medium:

[0061] Dissolve pyromellitic dianhydride in N,N-dimethylformamide to form pyromellitic dianhydride solution; dissolve diaminodiphenyl ether in N,N-dimethylformamide to form diaminodiphenyl ether Phenyl ether solution: adding the pyromellitic dianhydride solution into the diaminodiphenyl ether solution, stirring and mixing for 3 hours to obtain a polyamic acid solution with a concentration of 3 g / ml.

[0062] Mix and stir the polyamic acid solution and triethylamine, the amount of triethylamine added is 0.3wt%, to obtain a polyamic acid salt solution, continue to stir and add water, the amount of water added is polyamic acid solution: water = 1:10, The stirring speed is 300r / min, and the total stirring time is 2h to form a polyamic acid nanoemulsion w...

Embodiment 2

[0074] This embodiment provides a graphene / polyimide thermally conductive film, the preparation method of which is roughly the same as that of Embodiment 1, except that:

[0075] Step 2, adding the polyamic acid nanoemulsion to the graphene dispersion and stirring, the addition amount of the polyamic acid nanoemulsion is polyamic acid: graphene=10:100, and the stirring time is 4h, uniformly mixed to obtain graphene / poly Amic acid composite slurry.

[0076] After testing, the density of the obtained graphene / polyimide thermal conductive film is 1.92g / cm 3 ; Thickness is 48μm; In-plane thermal diffusivity is 603mm 2 / s, thermal conductivity 984W m -1 ·K -1 .

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Abstract

The embodiment of the invention provides a graphene / polyimide heat-conduction film and a preparation method thereof, which relate to the field of graphene. The preparation method of the graphene / polyimide heat conduction film mainly comprises the following steps: adding a polyamic acid nano-emulsion taking water as a medium into a graphene dispersion liquid taking water as a medium, and stirring to obtain graphene / polyamic acid composite slurry; and sequentially carrying out self-assembly film formation, imidization, carbonization and graphitization on the graphene / polyamic acid composite slurry. The preparation method is low in cost, environmentally friendly and suitable for mass production, the interface thermal resistance between graphene sheets in the heat conduction film can be reduced, and the heat conductivity is improved.

Description

technical field [0001] The present application relates to the field of graphene, in particular, to a graphene / polyimide thermally conductive film and a preparation method thereof. Background technique [0002] Graphene (Graphenes) is a two-dimensional carbon material composed of a layer of carbon atoms that are periodically densely packed in a benzene ring structure (that is, a hexagonal honeycomb structure). The thermal conductivity of graphene is 5300W / (m·K), It is the material with the highest thermal conductivity known, and its heat dissipation efficiency is much higher than that of current commercial graphite heat sinks. Although the current preparation process of graphene thermal conductive film is easy to control, low in cost and environmentally friendly, compared with other heat dissipation materials, the prepared graphene thermal conductive film has better mechanical properties, higher thermal conductivity, light weight, and material Thin, good flexibility and so o...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L79/08C08K3/04C09K5/14
CPCC08J5/18C09K5/14C08J2379/08C08K3/042
Inventor 李妙妙郭玉芬刘跃文刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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