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Polyimide film for artificial graphite film, preparation method of polyimide film and artificial graphite film

A technology of polyimide film and artificial graphite, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of graphite film thermal conductivity and unsatisfactory mechanical properties, and achieve high birefringence and orientation Good, the effect of improving the degree of imidization

Pending Publication Date: 2021-03-30
浙江中科玖源新材料有限公司
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  • Summary
  • 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 type and BPDA / PDA type polyimide are not ideal, and the properties of the graphite film depend on the polyimide as the raw material. On this basis , how to adjust the properties of PMDA / ODA and BPDA / PDA polyimide to obtain artificial graphite film with excellent thermal conductivity and mechanical properties is an urgent research topic.

Method used

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  • Polyimide film for artificial graphite film, preparation method of polyimide film and artificial graphite film
  • Polyimide film for artificial graphite film, preparation method of polyimide film and artificial graphite film

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preparation example Construction

[0021] About the preparation of polyimide membrane

[0022] When preparing the polyimide film for artificial graphite film, the present invention adopts "two-step method" to obtain the polyimide precursor-polyamic acid first, and then through thermal imidization, chemical imidization or thermal imidization Combination of chemical imidization and chemical imidization to obtain polyimide films. Thermal imidization is preferred in the present invention.

[0023] Wherein, the concrete process of preparing polyamic acid can be specified by following content:

[0024] When obtaining a polyamic acid from a dianhydride and a diamine, it can carry out under conventionally known conditions, and the addition order and addition method of a dianhydride and a diamine monomer are not specifically limited. For example, the diamine monomer can be dissolved in an organic solvent, then the dianhydride monomer can be added, and the polymerization reaction can be carried out at a suitable reacti...

Embodiment 1

[0034] Polyimide film:

[0035] Add 4,4'-diaminodiphenyl ether (ODA), pyromellitic dianhydride (PMDA), and 1,4,5,8-naphthalene tetracarboxylic dianhydride in a molar ratio of 100:90:10 In N,N-dimethylacetamide, react while stirring, and react at 30° C. for 4 hours to obtain a polyamic acid slurry with a solid content of 20%;

[0036] 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%;

[0037] Add the calcium hydrogen phosphate slurry and the ferric oxide slurry into the 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, and t...

Embodiment 2

[0041] Add 4,4'-diaminodiphenyl ether (ODA), pyromellitic dianhydride (PMDA), and binaphthic anhydride in a molar ratio of 100:90:10 to N,N-dimethylacetamide During the reaction while stirring, the reaction was carried out at 40°C for 4 hours to obtain a polyamic acid slurry with a solid content of 20%; the others were the same as in Example 1, and an artificial graphite film of 24 μm was obtained.

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Abstract

The invention provides a polyimide film for an artificial graphite film, a preparation method of the polyimide film and the artificial graphite film. The polyimide film is formed by polymerizing dianhydride and diamine; the diamine is selected from p-phenylenediamine or 4,4'-diaminodiphenyl ether; the dianhydride comprises dianhydride A and dianhydride B, and the dianhydride A is selected from oneof 3,3',4,4'-biphenyl tetracarboxylic dianhydride or pyromellitic dianhydride; and the dianhydride B is selected from one or two of 1,4,5,8-naphthalene tetracarboxylic dianhydride, binaphthalene dianhydride or perylene anhydride. By regulating and controlling the formula of the polyimide film, the imidization degree is improved, the obtained polyimide film is good in crystal orientation and highin birefringence, and the obtained artificial graphite film is excellent in performance.

Description

technical field [0001] The invention belongs to the field of macromolecular polymer materials, and in particular relates to a polyimide film for an artificial graphite film, a preparation method thereof and an artificial 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. Since graphite sheets have higher thermal conductivity than metal sheets such as copper and aluminum, they have recently attracted attention as heat dissipation components for electronic devices. Many methods for producing graphite films that can be used in electronic devices and the like are known. [0003] Due to the excellent properties of polyimide itself, more and more attention has been paid to the preparation of artificial graphite membranes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08C08K3/32C08K3/22C01B32/205
CPCC08G73/1071C08G73/1067C08G73/1007C08J5/18C01B32/205C08J2379/08C08K2003/325C08K2003/2272
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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