Graphite mixture, graphite film for heat conducting, and preparation method and application of graphite mixture, graphite film

A technology of mixture and graphite film, applied in the direction of heat exchange materials, chemical instruments and methods, electrochemical generators, etc., can solve problems such as unsatisfactory effects, achieve simple and feasible methods, simple preparation processes, and reduce manufacturing costs.

Active Publication Date: 2017-06-13
祝巧凤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0042] The problem of the prior art that the present invention solves is: the existing graphite heat conduction film all only has XY direction heat conduction effect, and Z conduction heat conduction is mainly based on physical structure improvement, and the effect is usually unsatisfactory, therefore develops a kind of new technological method and uses Different purposes, it is necessary to develop Z-oriented high thermal conductivity graphite film

Method used

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  • Graphite mixture, graphite film for heat conducting, and preparation method and application of graphite mixture, graphite film
  • Graphite mixture, graphite film for heat conducting, and preparation method and application of graphite mixture, graphite film
  • Graphite mixture, graphite film for heat conducting, and preparation method and application of graphite mixture, graphite film

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preparation example Construction

[0083] Among them, in a preferred embodiment of the present invention, the preparation method of the polyimide polymer slurry includes the following steps: adding dianhydride and diamine raw materials into a solvent to react to obtain a polyimide polymer slurry solution.

[0084] Preferably, the dianhydride raw material is selected from one or more of pyromellitic dianhydride, diphenyl ether tetracarboxylic dianhydride, benzophenone tetracarboxylic dianhydride or phthalic anhydride;

[0085] Preferably, the diamines are selected from m-phenoxy diphenylamine, dimethyl diaminobiphenyl, ureido diphenylamine, p-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl ether, diamino One or more of dihydroxybiphenyls.

Embodiment 1

[0092] Embodiment 1 Divided into 8 experimental groups and 8 control groups, respectively prepared slurry according to the following method.

[0093] (1) Experimental group 1

[0094] First weigh 44.3kg of 4,4'-diaminodiphenyl ether powder (ODA, purity: 99.5%) and place it in a 1000L jacketed reactor, then add 640kg of N,N-dimethylacetamide solvent which is dried and dehydrated by metal magnesium (DMAc, industrial grade, purity 99%), start stirring at room temperature (rotating speed 25 rpm), until the diammonium is completely dissolved, the solution appears as a colorless transparent liquid. Then, add 3,3',4,4'-diphenyl ether tetra-acid dianhydride powder to it in 8~10 times altogether 66.7kg (ODPA, technical grade, purity 99.5%), each adding time interval is about 10 ~15min, and completely dissolved. When the dianhydride is just added, the color of the system is dark yellow. After the dianhydride is completely added, the color of the whole system is darker than that at the...

Embodiment 2

[0121] Example 2 Two-step casting method to prepare polyimide film

[0122] The extrusion coating module produced by Panasonic Corporation of Japan is installed on the coating machine of the steel belt substrate. The width of the coating machine is 1500mm, the width of the extrusion coating head is 1200mm, and the length of the circulating steel belt is 30m, and the width is 1400mm. There are 7 sections in the oven, and the temperature zones of each section are set as follows: 70°C, 110°C, 140°C, 150°C, 180°C, 180°C, 150°C, 100°C, the examples and comparative examples 1 / 1, 2 / 2, 4 / 4, 5 / 5 and other 8 groups of slurry are pumped into the extrusion coating head with a diaphragm pump, and the monomer magnetic field strength is 1.2 Tesla (T) is installed on the upper side of the coated steel strip before entering the oven. The magnetic blocks (iron neodymium boron permanent magnet blocks, specifications 200mm*50mm*30mm, a total of 62 pieces, assembled into a magnetic field area with...

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Abstract

The invention relates to the field of battery heat-conducting materials, and particularly relates to a graphite mixture, graphite film for heat conducting, and a preparation method of the graphite mixture and the graphite film. The graphite mixture for heat conducting comprises a polyimide polymer and a magnetic-conductive material, the magnetic-conductive material comprises graphite. In addition, the preparation method of the graphite mixture for heat conducting comprises the following steps: adding the magnetic-conductive material into the polyimide polymer solution, to obtain the graphite mixture for heat conducting. The invention also provides a graphite film for heat conducting, which is prepared from the graphite mixture for heat conducting. The prepared heat-conducting film with the heat conductivity of 300-2000W/m.K and can widely replace or can be used in various heat-radiating environments by combining aluminum/copper heat-radiating materials, and compared with the existing same type heat-radiating material, the heat-radiating film material prepared by using the technology shows excellent heat-radiating performance, is beneficial to light weight and small size of the product, and has obvious economic effects.

Description

technical field [0001] The invention relates to the field of battery heat-conducting materials, in particular to a graphite mixture for heat conduction, a graphite film and a preparation method thereof, and in particular to a Z-conduction heat-conducting graphite mixture, a Z-conduction heat-conduction graphite film, a preparation method and application thereof. Background technique [0002] In recent years, with the rise of smart phones, smart cars, and new energy vehicles, more and more mobile devices have become data collection points and integration points for big data, Internet of Things, etc. Mobile devices are running faster and faster, and energy consumption is also getting higher and higher. When energy is supplied to the mobile terminal, some circuit auxiliary mechanisms will generate relatively large heat at the same time. Take the current Qualcomm Snapdragon CPU for smartphones as an example. The power consumption of one A57 core of the Snapdragon 810 is 5W, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K7/00C08K3/04C08K3/22C08K3/30C08K3/16C08K5/3477C08G73/10C08J5/18C09K5/14H01M10/613H01M10/653
CPCC08G73/1067C08G73/1071C08J5/18C08J2379/08C08K3/04C08K3/16C08K3/22C08K3/30C08K5/3477C08K7/00C08K2003/2275C08K2003/3045C08K2003/3072C08K2201/003C08K2201/016C08L2203/16C09K5/14H01M10/613H01M10/653C08L79/08Y02E60/10
Inventor 祝巧凤
Owner 祝巧凤
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