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A kind of graphite film composite body and preparation method thereof

A technology of graphite film and composite, which is applied in the field of graphite film polymer composite and its manufacturing, can solve the problems of complex process, low flexural strength of graphite film composite, easy peeling, etc., and achieve simple preparation method, interlayer Strong binding force and good interlayer binding force

Active Publication Date: 2019-01-01
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When preparing graphite-film polymer composites, the existing methods are relatively complicated, and the bending strength of graphite-film composites is not high, and the layers are easy to peel off.

Method used

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  • A kind of graphite film composite body and preparation method thereof
  • A kind of graphite film composite body and preparation method thereof
  • A kind of graphite film composite body and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. S101, stacking, stacking 300 commercial expanded graphite films (the first type of graphite film) with a size of 10cm×10cm and a thickness of 50μm layer by layer to form a graphite film laminate.

[0049] 2. S102, one impregnation, take 200g of n-butanol and 600g of xylene, mix 800g of diluent according to the ratio of 1:3, then add 800g of diluent to 800g of bisphenol F epoxy resin, stir well, and then add 200g of polyamide resin is used as a curing agent, and stirred evenly to obtain a liquid polymer binder; the graphite film laminate is placed in a mold, and the mold is placed in a vacuum impregnation furnace, and the vacuum impregnation furnace starts to evacuate until the pressure is 10Pa , the temperature in the impregnation furnace is 25°C, open the fluid valve of the vacuum impregnation furnace, flow the liquid polymer binder into the mold, close the fluid valve, immerse for 3 hours, and the pressure is 10Pa, the liquid polymer binder passes through the graphi...

Embodiment 2

[0056] 1. S101, stacking, stacking 200 commercial pyrolytic graphite films (the second type of graphite film) with a size of 5cm×5cm and a thickness of 40μm layer by layer to make a graphite film laminate.

[0057] 2. S102, one impregnation, take 200g of n-butanol and 600g of xylene, mix 800g of diluent according to the ratio of 1:3, then add 800g of diluent to 800g of bisphenol F epoxy resin, stir well, and then add 200g of polyamide resin is used as a curing agent, and stirred evenly to obtain a liquid polymer binder, the graphite film laminate is placed in a mold, the mold is placed in a vacuum impregnation furnace, and the vacuum impregnation furnace starts to evacuate until the pressure is 10Pa , the temperature in the impregnation furnace is 25°C, open the fluid valve of the vacuum impregnation furnace, flow the liquid polymer binder into the mold, close the fluid valve, impregnate for 1.5h, and the pressure is 10Pa, the liquid polymer binder passes through the graphite f...

Embodiment 3

[0064]1. S101, stacking, stacking 100 self-made graphite films with a size of 5cm×5cm and a thickness of 20μm layer by layer to make a graphite film laminate. The graphite film used is the third type of graphite film, which is prepared from graphene oxide. For the specific method, please refer to Ultrathin Flexible Graphene Film: An Excellent Thermal Conducting Material with Efficient EMI Shielding (Advanced Functional Materials, 24(2014), 4542–4548). The specific steps are as follows : 1) Dissolve 5g of graphene oxide in 5000mL of deionized water and stir it ultrasonically for 1 hour; 2) Then pour it into a polytetrafluoroethylene watch glass and dry it at 50°C for 10 hours to remove moisture, and the bottom of the watch glass will be oxidized Graphene film, because the graphene oxide film is poorly bonded to the polytetrafluoroethylene at the bottom, so the graphene oxide film can be peeled off to obtain an independent graphene oxide film; 3) Subsequently, the graphene oxide ...

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Abstract

The present invention provides a preparation method of a graphite film composite body. According to the preparation method, a polymer binder is infiltrated into a plurality of layers of graphite films by means of dipping and punching processes, so that the graphite film composite body can be formed. The method has the advantages of simplicity, reliability and high operability, and can be applied to the preparation of graphite film polymer composite bodies. The graphite film composite body prepared by using the method has the advantages of small density, adjustable thickness, high thermal conductivity, good mechanical properties, strong interlayer bonding strength and the like, and can be widely applied to the thermal management of electronic products.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a graphite film polymer composite and a manufacturing method thereof. Background technique [0002] With the rapid development of electronic technology, the volume of electronic components is shrinking, the integration of chips is increasing, and the heat flux is also increasing. High-power electronic components will generate a lot of heat. If effective thermal management measures are not taken to transfer the heat away, the components will be damaged or even damaged. Graphite is a good thermal conductivity material with layered structure and anisotropy, and its plane thermal conductivity can reach 50-1800W / (m·K). Moreover, the density of graphite is low, the theoretical density is only ~2.2g / cm 3 , is a thermally conductive material with broad application prospects. The graphite film or graphite sheet developed in recent years can be as thin as tens of microns, and has good...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K7/20B32B9/00B32B27/04B32B7/12B32B37/12B32B38/08B32B38/00B32B38/04B32B38/18
CPCB32B7/12B32B9/007B32B27/04B32B37/12B32B38/04B32B38/1808B32B2038/0076B32B2038/047B32B2260/046B32B2307/302B32B2307/54B32B2457/00H05K7/20
Inventor 王华涛姜斌
Owner HARBIN INST OF TECH AT WEIHAI
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