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Flexible carbon fiber composite electromagnetic shielding film and preparation method thereof

A composite electromagnetic and carbon fiber technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of complex preparation process and poor shielding performance, achieve good flexibility, high electromagnetic shielding performance, and improve the overall mechanical properties.

Pending Publication Date: 2021-01-05
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of complex preparation process and poor shielding performance of existing carbon-based electromagnetic shielding materials, the present invention provides a flexible carbon fiber composite electromagnetic shielding film and its preparation method

Method used

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  • Flexible carbon fiber composite electromagnetic shielding film and preparation method thereof
  • Flexible carbon fiber composite electromagnetic shielding film and preparation method thereof
  • Flexible carbon fiber composite electromagnetic shielding film and preparation method thereof

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preparation example Construction

[0029] A kind of preparation method of flexible carbon fiber composite electromagnetic shielding film of the present invention comprises the following steps:

[0030] First, cobalt nitrate, urea and nickel nitrate are added to the solvent, stirred to fully dissolve, and the precursor solution is prepared; then the precursor solution and acidified chopped carbon fibers are added to the reactor for hydrothermal reaction, and the magnetic nanowires Uniform growth on the surface of chopped carbon fibers. After the reaction, the product is rinsed and dried, and then sintered at a temperature of 300-1000°C under nitrogen or air atmosphere to obtain magnetic chopped carbon fibers; then the magnetic chopped carbon fibers are subjected to suction filtration to obtain magnetic chopped carbon fiber membranes , and encapsulate the magnetic chopped carbon fiber film with polyimide resin or polyurethane resin, and finally obtain the flexible carbon fiber composite electromagnetic shielding ...

Embodiment 1

[0041] (1) Under room temperature conditions, fully dissolve 0.58g (2mmol) cobalt nitrate hexahydrate, 0.29g (1mmol) nickel nitrate hexahydrate and 0.72g (12mmol) urea in 35mL ethanol and deionized water (volume ratio=1: 1) was stirred and dissolved in the mixed solvent to obtain a precursor solution.

[0042](2) The chopped carbon fibers were treated with concentrated nitric acid at 30 °C for 8 h, rinsed with deionized water and dried in vacuum. The prepared precursor solution and the acidified chopped carbon fibers were transferred into a polytetrafluoroethylene-lined autoclave (50ml) for hydrothermal reaction, and the reaction was continued at 100°C for 12h. After the reaction is finished, rinse with deionized water and dry, and then sinter at a temperature of 300° C. in an air atmosphere to obtain magnetic chopped carbon fibers.

[0043] (3) At room temperature, add 4.08g (0.02mol) of 4,4'-diaminodiphenyl ether into a 250ml three-necked flask, then add 97.02g of N,N-dimet...

Embodiment 2

[0046] (1) Under room temperature conditions, fully dissolve 0.58g (2mmol) cobalt nitrate hexahydrate, 0.29g (1mmol) nickel nitrate hexahydrate and 0.72g (12mmol) urea in 35mL ethanol and deionized water (volume ratio=1: 1.5) was stirred and dissolved in the mixed solvent to obtain a precursor solution.

[0047] (2) The chopped carbon fibers were treated with concentrated nitric acid at 50°C for 5 h, rinsed with deionized water and dried in vacuum. The prepared precursor solution and the acidified chopped carbon fibers were transferred into a polytetrafluoroethylene lined autoclave (50ml) for hydrothermal reaction, and the reaction was continued at 120°C for 12h. After the reaction is finished, rinse with deionized water and dry, and then sinter at a temperature of 400° C. to obtain magnetic chopped carbon fibers.

[0048] (3) Add 4.08 g (0.02 mol) of 4,4'-diaminodiphenyl ether into a 250 ml three-necked flask at room temperature. Then add 61.08g of N,N-dimethylformamide and...

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Abstract

The invention discloses a flexible carbon fiber composite electromagnetic shielding film and a preparation method thereof, and belongs to the technical field of electromagnetic shielding. The preparation method comprises the following steps: pretreating chopped carbon fibers in a strong acid solution, compounding the pretreated chopped carbon fibers with a magnetic metal ion salt, uniformly growing magnetic nanowires on the chopped carbon fibers by adopting a hydrothermal reaction and high-temperature heat treatment method, performing suction filtration to obtain a magnetic chopped carbon fiber membrane, packaging the fiber film with resin, and carrying out heat treatment to finally obtain the flexible carbon fiber composite electromagnetic shielding film. Compared with a traditional prepared electromagnetic shielding material, the prepared magnetic microporous carbon composite film has the advantages of being high in structural stability, good in flexibility, high in shielding effectiveness and the like, and is expected to be applied to the field of high-performance electromagnetic shielding.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to a flexible carbon fiber composite electromagnetic shielding film and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology, various application fields have higher and higher requirements for high performance, miniaturization and integration of electronic equipment, which will inevitably produce a large amount of electromagnetic radiation. It will not only interfere with the operation of electronic equipment and communication equipment, but also cause potential harm to human health. Metal materials are widely used electromagnetic shielding materials at present, but the disadvantages of metals such as high density, easy corrosion, and poor fatigue resistance limit its further development. In addition, in some specific fields (such as stealth materials, precision electronic instrumen...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08L75/04C08K9/02C08K9/04C08K7/06C08G73/10C08J5/18H05K9/00
CPCC08J5/18C08G73/1007C08G73/1071H05K9/0081C08J2379/08C08J2475/04C08K9/02C08K9/04C08K7/06
Inventor 李建伟丁元清陆宇言孙卢希令狐克亮贺辛亥
Owner XI'AN POLYTECHNIC UNIVERSITY
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