High-thermal-conductivity wave-absorbing graphene composite film prepared from PI films, and preparation method of graphene composite film

A graphene composite and high thermal conductivity technology, applied in the field of composite materials, can solve the problems of low thermal conductivity, general electromagnetic shielding performance of graphene film, thick thickness, etc., and achieve the effects of fast conduction, good heat dissipation performance and excellent thermal conductivity

Active Publication Date: 2019-01-25
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, CN105600782B takes polyimide film (PI film) as raw material, and obtains graphene film through hot pressing, heat treatment, carbonization treatment and graphitization, and the electromagnetic shielding performance of graphene film prepared by this method is general, and its The thickness is thicker, more than 30μm; the thermal conductivity is low, and the thermal conductivity along the plane direction can only reach 1500W / (m·K)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the invention, multi-layer polyimide films are stacked, then carbonized and graphitized, and a wave absorbing agent is added at the same time to obtain a graphene composite film.

[0020] Specifically, under supercritical low temperature conditions, polyamide resin is mixed with chemical imidization reagents to obtain a partially imidized polyimide film. in N 2 Under the atmosphere, first, the multilayer polyimide film was laminated at 1400°C. Then put the laminated polyimide film into a carbonization furnace, and carry out high-temperature carbonization treatment according to the following process: from room temperature to 200 °C at a rate of 6 °C / min; then from room temperature to 200 °C at a rate of 7 °C / min Rise to 400°C; then raise from 400°C to 900°C at a rate of 10°C / min, and keep warm for 30 minutes after reaching 900°C; rise from 900°C to 1200°C at a rate of 5°C / min, and keep warm for 1 hour after reaching 1200°C ; Finally, the temperature was raised from ...

Embodiment 2

[0024] In the invention, multi-layer polyimide films are stacked, then carbonized and graphitized, and a wave absorbing agent is added at the same time to obtain a graphene composite film.

[0025] Specifically, under supercritical low temperature conditions, polyamide resin is mixed with chemical imidization reagents to obtain a partially imidized polyimide film. in N 2 Under the atmosphere, first, the multilayer polyimide film was laminated at 1200°C. Then put the laminated polyimide film into a carbonization furnace, and carry out high-temperature carbonization treatment according to the following process: from room temperature to 200 °C at a rate of 6 °C / min; then from room temperature to 200 °C at a rate of 7 °C / min Rise to 400°C; then raise from 400°C to 900°C at a rate of 10°C / min, and keep warm for 30 minutes after reaching 900°C; rise from 900°C to 1200°C at a rate of 5°C / min, and keep warm for 1 hour after reaching 1200°C .

[0026] After carbonization, put the ab...

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Abstract

The invention provides a high-thermal-conductivity wave-absorbing graphene composite film prepared from polyimide (PI) films, and a preparation method of the graphene composite film. The preparation method comprises the steps that multiple layers of the PI films are stacked up; then carbonization and graphitization are carried out; and a wave-absorbing agent is added in the carbonization and graphitization process for composition, and thus the graphene composite film is obtained. The graphene composite film comprises graphene and the wave-absorbing agent scattered among graphene layers. The wave-absorbing agent is added in the process that the PI films are carbonized and graphitized to be transformed into the graphene, so that the wave-absorbing agent is scattered among the graphene layers; through the wave-absorbing agent, electromagnetic waves are converted into heat energy so as to be dissipated; through the special structure of the graphene and the effects such as interfacial polarization and electron relaxation polarization which are caused by composition of the graphene and the wave-absorbing agent, the electromagnetic waves are dissipated; and thus, the graphene composite film becomes an electromagnetic shielding material with multiple electromagnetic loss mechanisms. Meanwhile, the graphene composite film rapidly conducts heat outwards by the excellent thermal conductivity thereof, thereby having good heat dissipation performance.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a high thermal conductivity wave-absorbing graphene composite film prepared from a PI film and a preparation method thereof. Background technique [0002] Thermally conductive film is an important material widely used in highly integrated electronic components, LEDs, flexible electronic components, computers and other fields. The thermal conductive films currently on the market are mainly pyrolytic graphite films and polyimide graphite films. Among them, pyrolytic graphite film is obtained from graphite through expansion, pyrolysis, calendering and other processes, and its thermal conductivity is about 600W / (m·K); while polyimide graphite film has a thermal conductivity of 1000W / (m·K) ), the mechanical properties are poor, and the process is complicated and the cost is high; and the thickness of the pyrolytic graphite film and the polyimide graphite film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/24C01B2204/26C01B32/184
Inventor 尹宗杰何立粮杨麟黎佩珊刘斌熊磊税钿
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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