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Carbon fiber sandwich composite material and preparation method and application thereof

A composite material and carbon fiber technology, applied in chemical instruments and methods, synthetic resin layered products, railway car bodies, etc., can solve problems such as the inability to meet the use requirements of high-speed rail car bodies, and achieve improved electromagnetic shielding efficiency and good flame retardant performance. , The effect of excellent thermal stability

Inactive Publication Date: 2020-05-08
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the carbon fiber composite materials currently on the market cannot meet the requirements for the use of high-speed rail car bodies, and its performance in various aspects still needs to be improved.

Method used

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  • Carbon fiber sandwich composite material and preparation method and application thereof
  • Carbon fiber sandwich composite material and preparation method and application thereof
  • Carbon fiber sandwich composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides a method for preparing a carbon fiber sandwich composite material, comprising:

[0056] S1. Fabrication of polyimide airgel core material

[0057] (1) Under nitrogen atmosphere, add 158g of 4,4-diaminodiphenyl ether into 3300mL of N-methylpyrrolidone, keep stirring until it is completely dissolved, then add 240g of 3,3,4,4-biphenyl Tetracarboxylic dianhydride, continue to stir for a certain period of time until the polycondensation reaction is complete after the reactant becomes transparent, and obtain a fully reacted polyamic acid solution;

[0058] (2) Add a moderate amount of 615mL acetic anhydride and 525mL pyridine to the polyamic acid solution, and mix well to completely polyimide the polyamic acid solution.

[0059] (3) Pour the product polyimide solution into the mold, wait for its gel and age at room temperature for 1 day, soak the aged gel in 5000mL absolute ethanol for sufficient solvent replacement, and soak for 3 days in total, eve...

Embodiment 2

[0081] This embodiment provides a method for preparing a carbon fiber sandwich composite material, comprising:

[0082] S1. Fabrication of polyimide airgel core material

[0083] (1) Under nitrogen atmosphere, add 179g of 2,2-dimethylbenzidine into 3600mL of N-methylpyrrolidone, keep stirring until it is completely dissolved, then add 269g of 3,3,4,4-benzophenone Tetraacid dianhydride, after the reactants become transparent, continue to stir for a certain period of time until the polycondensation reaction is complete, and a fully reacted polyamic acid solution is obtained.

[0084] (2) Add a moderate amount of 615mL acetic anhydride and 525mL pyridine to the polyamic acid solution, and mix well to completely polyimide the polyamic acid solution.

[0085] (3) Pour the product polyimide solution into the mold, wait for it to gel and age at room temperature for 1 day, then soak the aged gel in 5000mL absolute ethanol for sufficient solvent replacement, and soak for 3 days in tot...

Embodiment 3

[0105] This embodiment provides a method for preparing a carbon fiber sandwich composite material, comprising:

[0106] S1. Fabrication of polyimide airgel core material

[0107] (1) Under nitrogen atmosphere, add 179g of 2,2-dimethylbenzidine into 3600mL of N-methylpyrrolidone, keep stirring until it is completely dissolved, then add 269g of 3,3,4,4-benzophenone Tetraacid dianhydride, after the reactants become transparent, continue to stir for a certain period of time until the polycondensation reaction is complete, and a fully reacted polyamic acid solution is obtained.

[0108] (2) Add a moderate amount of 615mL acetic anhydride and 525mL pyridine to the polyamic acid solution, and mix well to completely polyimide the polyamic acid solution.

[0109] (3) Pour the product polyimide solution into the mold, wait for it to gel and age at room temperature for 1 day, then soak the aged gel in 5000mL absolute ethanol for sufficient solvent replacement, and soak for 3 days in total...

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Abstract

The invention belongs to the technical field of materials for high-speed train bodies, and particularly relates to a carbon fiber sandwich composite material and a preparation method and application thereof. The carbon fiber sandwich composite material comprises an upper skin, a lower skin and a middle core material. The layer structure of each skin comprises multiple layers of carbon fiber plaincloth-(an electromagnetic shielding layer-multiple layers of carbon fiber plain cloth)<n>, wherein n is smaller than or equal to 10. The core material is a polyimide aerogel plate. According to the invention, the specific core material is selected to be matched with the skins formed by specific compounding, so the advantages of low density, good environmental adaptability and high electromagneticshielding performance are achieved under the condition of ensuring bonding force; in addition, the carbon fiber sandwich composite material has the advantages of low room-temperature heat conductivity, good mechanical properties, excellent heat stability, good in flame retardant property and the like, is an ideal material for replacing aluminum profiles for the high-speed rail bodies, and can further improve the speed and carrying capacity of a high-speed rail.

Description

technical field [0001] The invention belongs to the technical field of high-speed train body materials, and in particular relates to a carbon fiber sandwich composite material and its preparation method and application. Background technique [0002] At present, the high-speed rail body is welded with aluminum alloy materials. If carbon fiber composite materials with higher strength and lighter weight are used instead of aluminum profiles, the speed and carrying capacity of the high-speed rail will be further improved; Interference of external electromagnetic signals, and to ensure smooth grounding, it is necessary to ensure that the alternative material has good electrical conductivity and electromagnetic shielding performance. [0003] Carbon fiber composite materials have the characteristics of low weight (compared with aluminum profiles, the weight is reduced by at least 1 / 4), which is very suitable for the production of high-speed rail bodies; in addition, compared with ...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B27/28B32B7/12B32B33/00B32B15/00B32B15/14B61D17/00
CPCB32B5/02B32B5/26B32B7/12B32B15/00B32B15/14B32B27/281B32B33/00B32B2262/106B32B2307/212B61D17/00
Inventor 孙琳崔健冯庆鹏高玉龙田爱琴
Owner CRRC QINGDAO SIFANG CO LTD
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