Preparation method of polyimide graphite film

A polyimide film and polyimide technology, applied in the coating and other directions, can solve the problems of limiting the application range of graphite film, difficulty in large-scale production, and high cost of carbon nanotubes, and improve the degree of graphitization and thickness. Controllable, inexpensive effects

Active Publication Date: 2021-01-26
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the problem of the thickness of polyimide graphite film seriously limits the application range of graphite film
[0004] Chinese patent CN111017921A provides a polyimide graphite film with controllable thickness and high degree of graphitization, which can solve the problem that the graphite crystal growth of polyimide graphite film is restricted by the thickness of PI film in the existing technology
However, carbon nanotubes have problems such as high cost and poor dispersion caused by simple mechanical stirring, which all bring difficulties to large-scale production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for polyimide graphite film, comprising the following steps:

[0029] S1. Disperse micro-carbonized plant fibers in N,N-dimethylacetamide, add 4,4'-diaminodiphenyl ether and 1,2,4,5-pyrellitic anhydride under a nitrogen atmosphere, and Stir and react at 10°C for 4 hours to obtain a polyamic acid solution containing micro-carbonized plant fibers, in which the molar ratio of 4,4'-diaminodiphenyl ether to 1,2,4,5-benzenetetracarboxylic anhydride is 1:1, The mass of micro-carbonized plant fibers is 15% of the sum of the mass of 4,4'-diaminodiphenyl ether and 1,2,4,5-benzenetetracarboxylic anhydride, 4,4'-diaminodiphenyl ether, 1, The ratio of the mass sum of 2,4,5-pyrellitic anhydride to the volume of N,N-dimethylacetamide is 2g:10mL;

[0030] S2. After the polyamic acid solution containing micro-carbonized plant fibers is dispersed by high-speed shearing with a high-shear homogenizer and ground and dispersed by a three-roller mill, it is placed in a v...

Embodiment 2

[0034] A preparation method for polyimide graphite film, comprising the following steps:

[0035] S1. Disperse micro-carbonized plant fibers in N,N-dimethylacetamide, add 4,4'-diaminodiphenyl ether and 1,2,4,5-pyrellitic anhydride to polymerize under nitrogen atmosphere reaction to obtain a polyamic acid solution containing micro-carbonized plant fibers, wherein the molar ratio of 4,4'-diaminodiphenyl ether to 1,2,4,5-benzenetetracarboxylic anhydride is 1:1.03, and the micro-carbonized plant fibers The mass of 4,4'-diaminodiphenyl ether and 1,2,4,5-pyrenetetracarboxylic anhydride is 10% of the sum of mass, 4,4'-diaminodiphenyl ether, 1,2,4, The ratio of the mass sum of 5-pyrellitic anhydride to the volume of N,N-dimethylacetamide is 1g:10mL;

[0036]S2. After the polyamic acid solution containing micro-carbonized plant fibers is dispersed by high-speed shearing with a high-shear homogenizer and ground and dispersed by a three-roller mill, it is placed in a vacuum drying oven ...

Embodiment 3

[0040] A preparation method for polyimide graphite film, comprising the following steps:

[0041] S1. Disperse micro-carbonized plant fibers in N,N-dimethylacetamide, add 4,4'-diaminodiphenyl ether and 1,2,4,5-pyrellitic anhydride to polymerize under nitrogen atmosphere reaction to obtain a polyamic acid solution containing micro-carbonized plant fibers, wherein the molar ratio of 4,4'-diaminodiphenyl ether to 1,2,4,5-benzenetetracarboxylic anhydride is 1:1.05, and the micro-carbonized plant fibers The mass of 4,4'-diaminodiphenyl ether, 1,2,4,5-pyrenetetracarboxylic anhydride is 5% of the sum of mass, 4,4'-diaminodiphenyl ether, 1,2,4, The ratio of the mass sum of 5-pyrellitic anhydride to the volume of N,N-dimethylacetamide is 3g:10mL;

[0042] S2. After the polyamic acid solution containing micro-carbonized plant fibers is dispersed by high-speed shearing with a high-shear homogenizer and ground and dispersed by a three-roller mill, it is placed in a vacuum drying oven for...

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Abstract

The invention discloses a preparation method of a polyimide graphite film, which comprises the following steps: chopping plant fibers, carrying out micro-carbonization pretreatment, conducting dispersing in an organic solvent, adding diamine and dianhydride, carrying out in-situ polymerization reaction to obtain a polyamide acid solution containing micro-carbonized plant fibers, and carrying out imidization treatment to obtain a polyimide film containing the micro-carbonized plant fibers, and conducting carbonization and graphitization to obtain the polyimide graphite film. According to the preparation method, the micro-carbonized plant fibers are directly added into a polyimide synthesis system as an in-situ polymerization reaction carrier, and the polyimide graphite film containing the carbon nanotubes is prepared through direct graphitization, so that the performance of the graphite film can be improved, and the production cost of the graphite film is greatly reduced; and the greenand low-cost new method is provided for producing the high-performance graphite film.

Description

technical field [0001] The invention relates to the technical field of polyimide graphite film, in particular to a preparation method of polyimide graphite film. Background technique [0002] Studies have shown that polyimide (PI) films can not melt during the carbonization process and maintain the film shape, and after high-temperature graphitization treatment, a highly oriented graphite film close to the structure of single-crystal graphite can be obtained. When heated to 500°C-700°C, the heteroatom oxygen, nitrogen, hydrogen, etc. in the PI film will be detached, the carbon content will increase rapidly, the PI film will be carbonized, and the molecules will be in an amorphous state; when heated to about 1000°C, The functional groups in the molecule are recombined to form continuous aromatic heterocyclic polycyclic compounds, and as the temperature increases, the hexagonal carbon network layer of graphite-like structure is formed and gradually grows; when heated to 2800-3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622C03C17/22
CPCC04B35/83C04B35/62222C03C17/22C03C17/002C03C17/007C04B2235/6562C04B2235/6567C04B2235/48C04B2235/5288C04B2235/95C04B2235/9607C03C2217/45C03C2217/465C03C2217/475C03C2217/70C03C2218/11C03C2218/32
Inventor 孙善卫毛永唐伟潘成
Owner ANHUI GUOFENG PLASTIC
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