Graphene-containing heat conducting polyimide film and preparation method thereof

A technology of polyimide film and polyimide resin, which is applied in the field of preparation of graphene heat-conducting polyimide film, can solve the problem of poor applicability, small addition amount, decreased elastic modulus and tensile strength, etc. problems, to achieve the effect of increasing thermal conductivity and mechanical properties

Inactive Publication Date: 2019-07-02
JIANGSU YABAO INSULATION MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that although the thermal conductivity is improved, the mechanical properties of the film are not high, and the ultra-thick film is prepared, so the applicability is not strong
However, most of the existing studies use reduced graphene oxide as an additive and the amount of addition is small. On the one hand, it is difficult to disperse graphene in the polyimide matrix, and on the other hand, graphene is expensive.
However, the performance of this reduced graphene oxide is very different from that of graphene, so it cannot intuitively reflect the effect of graphene addition on the performance of polyimide membranes.
At the same time, with the increase of graphene addition, the heat resistance and electrical conductivity of the composite film were enhanced, while the elastic modulus and tensile strength decreased.

Method used

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  • Graphene-containing heat conducting polyimide film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] A kind of preparation method of graphene thermally conductive polyimide film is carried out according to the following steps:

[0031] (1) At room temperature, add 4,4'-diaminodiphenyl ether and pyromellitic dianhydride into the reaction kettle, add m-cresol under nitrogen protection, stir well, add isoquinoline, and heat up to 200°C , reacted for 12 hours, poured the reaction solution into ethanol to precipitate after cooling, and made polyimide resin;

[0032] (2) Put the modified graphene in dimethylacetamide, add a silane coupling agent, pre-disperse after high-temperature treatment in a high-shear disperser, and the treatment temperature is 400 ° C;

[0033] The preparation method of described modified graphene is as follows:

[0034] 1) Get 200m L of DMF and pour it into a round bottom flask, add 15g CaH thereto 2 Stir and dry for 22 hours, carry out vacuum vacuum distillation, and then save the DMF obtained through vacuum distillation for later use;

[0035] 2...

Embodiment 2

[0046] A kind of preparation method of graphene thermally conductive polyimide film is carried out according to the following steps:

[0047] (1) At room temperature, add 4,4'-diaminobenzenemethane and 4,4'-diamino-2,2'-bistrifluoromethylbiphenyl to the reaction kettle, and add dimethylformaldehyde under nitrogen protection Amide, after stirring evenly, add isoquinoline, heat up to 180°C, react for 11 hours, after cooling, pour the reaction solution into ethanol to precipitate, and make polyimide resin;

[0048] (2) Put the modified graphene in dimethyl sulfoxide, add titanate, pre-disperse after high-temperature treatment in a high-shear disperser, and the treatment temperature is 330 ° C;

[0049] Described modified graphene, its preparation method is as follows:

[0050] 1) Get 200m L of DMF and pour it into a round bottom flask, add 15g CaH thereto 2 Stir and dry for 18 hours, carry out vacuum vacuum distillation, and then save the DMF obtained through vacuum distillatio...

Embodiment 3

[0062] A kind of preparation method of graphene thermally conductive polyimide film is carried out according to the following steps:

[0063] (1) At room temperature, 1,5-bis(4-amino-2-trifluoromethylphenoxy)naphthalene and 3,3'4,4'-benzophenone tetracarboxylic dianhydride were added to the reaction Kettle, add N-methylpyrrolidone under the protection of nitrogen, after stirring evenly, add isoquinoline, heat up to 200 ° C, react for 13 hours, after cooling, pour the reaction solution into ethanol to precipitate, and make polyimide resin;

[0064] (2) Put the modified graphene in dimethylacetamide, add isopropyl triisostearyl titanate, pre-disperse after high-temperature treatment in a high-shear disperser, and the treatment temperature is 500 ° C;

[0065] The preparation method of described modified graphene is as follows:

[0066] 1) Get 200m L of DMF and pour it into a round bottom flask, add 15g CaH thereto 2 Stirring and drying for 25 hours, vacuum distillation under r...

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Abstract

The invention discloses a preparation method of a graphene-containing heat conducting polyimide film. The method comprises the following steps: synthesizing a polyimide resin from a diamine monomer and a dianhydride monomer, adding modified graphene treated with a coupling agent, and carrying out imidization. The addition of the modified graphene and coupling agent treatment in the preparation process of the polyimide film greatly increase the heat conductivity and the mechanical properties of the material in order to meet the needs of the market.

Description

technical field [0001] The invention relates to a polyimide film, in particular to a preparation method and a product of a graphene heat-conducting polyimide film. Background technique [0002] Polyimide film, which is a new type of organic polymer film, is polycondensed and cast by pyromellitic dianhydride and diaminodiphenyl ether in a very strong solvent N,N-dimethylacetamide Formed into a film and then imidized. It has excellent mechanical properties, electrical properties, chemical stability, radiation resistance, high temperature resistance and low temperature resistance. However, the thermal conductivity of polyimide film is about 0.1-0.2W / m.K, and the electrical conductivity is about 10 -12 S / m, therefore, will cause electrostatic accumulation on the surface of the material, causing local overheating of the material and premature aging, thus limiting its application. [0003] Chinese patent announcement number CN101168598B discloses a method for preparing an ultra...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L79/08C08K9/06C08K9/04C08K3/04
CPCC08J5/18C08J2379/08C08K3/042C08K9/04C08K9/06
Inventor 王勇王宇轩徐伟伟殷安民祈晓东姜新李静许培俊高尚林
Owner JIANGSU YABAO INSULATION MATERIAL
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