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Polyimide film and graphite film

A technology of polyimide film and diamine monomer, which is applied in the direction of inorganic chemistry, non-metallic elements, carbon compounds, etc., can solve the problems of graphite film thermal conductivity and unsatisfactory mechanical properties, and achieve increased molecular weight accumulation force and thermal conductivity Excellent mechanical properties and high birefringence

Pending Publication Date: 2021-04-06
浙江中科玖源新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal conductivity and mechanical properties of the graphite film prepared by the existing PMDA / ODA polyimide are not ideal, and the properties of the polyimide graphite film depend on the polyimide as the raw material. On this basis However, how to adjust the properties of PMDA / ODA polyimide to obtain artificial graphite films with excellent thermal conductivity and mechanical properties is an urgent research topic.

Method used

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  • Polyimide film and graphite film
  • Polyimide film and graphite film
  • Polyimide film and graphite film

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preparation example Construction

[0023] About the preparation of polyimide film

[0024] The raw materials used in the synthesis of the polyimide of the present invention include pyromellitic dianhydride (PMDA), 4,4'-diaminodiphenyl ether (ODA) and at least one second diamine monomer. The second diamine monomer is a nitrogen-containing heterocyclic diamine monomer. The nitrogen-containing heterocyclic diamine monomer is selected from diamine monomers containing imidazole, pyridine, pyrazine or pyrimidine structures.

[0025] The diamine monomer containing imidazole structure is selected from 2-(4-aminophenyl)-5-aminobenzimidazole, 2,2'-bis(4-aminophenyl)-5,5'-bisbenzone One or both of imidazole and 1,4-bis(5'-aminobenzimidazole-2'-)benzene; the diamine monomer containing pyridine structure is selected from 2,5-bis(4-aminophenyl ) pyridine or 2-(4-aminophenyl)-5-aminopyridine; the diamine monomer containing pyrimidine structure is selected from 2,5-bis(4-aminophenyl)pyrimidine or 2-(4-aminophenyl )-5-pyrimi...

Embodiment 1

[0043] Polyimide film:

[0044] 4,4'-diaminodiphenyl ether, pyromellitic dianhydride, 2-(4-aminophenyl)-5-aminobenzimidazole, according to the molar ratio of 90:100:10, in N, N - in dimethylacetamide, react while stirring, and react at 40°C for 4h to obtain a polyamic acid slurry with a solid content of 20%;

[0045] The filler calcium hydrogen phosphate, with an average particle size of 3 μm, was added to N,N-dimethylacetamide, and dispersed by high-speed stirring to prepare a solid content of 10% calcium hydrogen phosphate slurry; the filler ferric oxide, with an average particle size of 3 μm, Adding N, N-dimethylacetamide, using high-speed stirring to disperse, and preparing ferric oxide slurry with a solid content of 10%;

[0046] Add the calcium hydrogen phosphate slurry and the ferric oxide slurry to the prepared polyamic acid slurry, control the filler content in the calcium hydrogen phosphate slurry to be 0.5% of the solid weight of the polyimide film material, and th...

Embodiment 2

[0050] 4,4'-diaminodiphenyl ether, pyromellitic dianhydride, 1,4-bis(5'-aminobenzimidazole-2'-)benzene in a molar ratio of 90:100:10, in N , in N-dimethylacetamide, react while stirring, and react at 40° C. for 4 hours to obtain a polyamic acid resin solution with a solid content of 20%. Others are the same as embodiment 1.

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Abstract

The invention provides a polyimide film and a graphite film, the polyimide film is obtained by polymerization of pyromellitic dianhydride, 4,4'-diaminodiphenyl ether and a second diamine monomer accounting for 1-50 mol% of a diamine monomer, the second diamine monomer is a diamine monomer containing a nitrogen heterocyclic ring, the imidization degree and the crystal orientation of polyimide are improved through formula regulation and control, and the obtained polyimide graphite film has excellent thermal conductivity and mechanical properties.

Description

technical field [0001] The invention belongs to the field of high molecular polymer materials, and in particular relates to a polyimide film and a graphite film. Background technique [0002] With the development of science and technology, the trend of thinning electronic equipment and increasing the density of internal circuit design is becoming more and more obvious. Under this requirement, the heat dissipation design inside the equipment becomes the key. Due to the characteristics of high heat dissipation efficiency, small space occupation, light weight, and uniform heat conduction in two directions, graphite sheets can evenly distribute heat in a two-dimensional plane to effectively transfer heat. Therefore, in recent years, it has attracted attention as a heat dissipation member of an electronic device, and many methods of producing a graphite film that can be used in electronic devices and the like have been known. [0003] Due to the excellent properties of polyimide...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08L79/08C08K3/32C08K3/22C08J5/18C01B32/205
CPCC08G73/1071C08G73/1007C08J5/18C01B32/205C08J2379/08C08K2003/325C08K2003/2272
Inventor 张群吴星琳祝春才金文斌
Owner 浙江中科玖源新材料有限公司
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