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Carbon fiber epoxy preimpregnated interface hyperbranched polyamide coupling method

A technology of hyperbranched polyamide and epoxy resin, which is applied in the interface coupling field of carbon fiber epoxy resin prepreg, can solve the problems of affecting high temperature resistance performance and strength, poor pertinence, and high cost, so as to improve wettability, Improve the effect of interfacial chemical reaction, high temperature resistance and mechanical properties

Inactive Publication Date: 2018-12-11
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time in the past, prepregs have not been mass-produced and developed due to their high cost. The production and research and development of carbon fiber epoxy resin prepregs in my country are at a relatively low level, mainly due to the wettability and interface properties of prepregs. The coupling performance is not ideal, which directly affects its high temperature resistance and strength after curing
At present, there are obvious deficiencies in the technical methods of carbon fiber surface modification, and the pertinence is not strong and the effect is not significant.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First, put 100 grams of carbon fiber bundles in 1000 ml of concentrated nitric acid solution for 8-10 hours, let stand at room temperature for 10-12 hours, then wash repeatedly with water, dry at 100 degrees Celsius to constant weight; take 52 grams of diethylenetriamine and add In a three-necked flask equipped with a stirrer, slowly add 50 grams of succinic anhydride, stir evenly, and evenly coat the mixture on the surface of unidirectional carbon fiber or carbon fiber fabric, place it at 130 degrees for more than 3 hours for melting and polycondensation reaction, and cool down to 90 degrees Celsius Dissolve the free hyperbranched polyamide on the surface with hot water, wash and dry repeatedly; finally, immerse the metered carbon fiber bundle in the epoxy resin and curing agent solution for 10 minutes, then squeeze out the resin on the surface and dry to meet the requirements. Carbon fiber grafted hyperbranched polyamide significantly improved the mechanical properties...

Embodiment 2

[0016] First, put 100 grams of carbon fiber fabric in 1000 ml of concentrated sulfuric acid and concentrated nitric acid (mass ratio 3:1)) mixed solution for 8-10 hours, let stand at room temperature for 10-12 hours, then wash repeatedly with water, and dry at 100 degrees Celsius to Constant weight; take 52 grams of diethylenetriamine and add it to a three-necked flask equipped with a stirrer, slowly add 50 grams of succinic anhydride, stir evenly, and spread the mixture evenly on the surface of unidirectional carbon fiber or carbon fiber fabric, and place it at 130 degrees Melt polycondensation reaction for more than 3 hours, lower the temperature to about 90°C, dissolve the free hyperbranched polyamide on the surface with hot water, wash and dry repeatedly; finally, immerse the metered carbon fiber bundles in the epoxy resin and curing agent solution for 10 minutes, and then Squeeze out the resin on the surface and dry to meet the requirements. Carbon fiber grafted hyperbran...

Embodiment 3

[0018] First, put 100 grams of carbon fiber fabric in 1000 ml of concentrated nitric acid solution for 8-10 hours, let it stand at room temperature for 10-12 hours, then wash it repeatedly with water, and dry it to constant weight at 100 degrees Celsius; take 73 grams of polyethylene polyamine and add it to the container. In a three-necked flask with a stirrer, slowly add 50 grams of succinic anhydride, stir evenly, spread the mixture evenly on the surface of unidirectional carbon fiber or carbon fiber fabric, place it at 130 degrees for more than 3 hours for melting and polycondensation reaction, and cool down to about 90 degrees Celsius , dissolve the free hyperbranched polyamide on the surface with hot water, wash and dry repeatedly; finally, immerse the metered carbon fiber bundle in the epoxy resin and curing agent solution for 10 minutes, then squeeze out the resin on the surface, and dry to meet the requirements. Carbon fiber grafted hyperbranched polyamide significantly...

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Abstract

The invention discloses a carbon fiber epoxy preimpregnated interface hyperbranched polyamide coupling method. The method comprises the following steps: firstly treating carbon fibers by use of oxidizing acid or salt, so as to produce a large amount of carboxylic acid groups on the surface there; then utilizing the carboxyl on the surfaces of the carbon fibers to participate in polycondensation reaction for preparing hyperbranched polyamide between acid anhydride and polyamine, thereby obtaining carbon fiber in-site-grafted hyperbranched polyamide; furthermore, utilizing rich amine groups at terminals of hyperbranched polyamide molecules to participate in solidifying of epoxy resin, thereby realizing coupling epoxy resin and carbon fibers. Carbon fibers are grafted with hyperbranched polyamide, so that on on hand, the wettability of the epoxy resin is improved, on the other hand, the surface chemical reaction is improved, and the high temperature resistance and mechanical property of the carbon fiber-epoxy resin composite are obviously improved.

Description

technical field [0001] The invention relates to a method for interfacial coupling of carbon fiber epoxy resin prepregs, belonging to the field of interface treatment of carbon fiber epoxy resin prepregs. Background technique [0002] Polycarbon fiber (carbon fiber) not only has the inherent intrinsic characteristics of carbon materials, but also has the softness and processability of textile fibers. It is a new generation of reinforcing fibers. Due to its excellent physical properties, carbon fiber composites have been widely used and developed in aerospace, construction, automobile industry and other fields. Prepreg is a combination of resin matrix and reinforcement made by impregnating unidirectional fibers or fabrics with resin glue. Carbon fiber prepreg is usually made of carbon fiber yarn, epoxy resin, release paper and other materials, and is a composite material processed by coating, hot pressing, cooling, laminating, coiling and other processes. It is a carbon fiber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/44C08G69/26C08K7/06
CPCC08G59/44C08G69/26C08K7/06
Inventor 崔举庆夏琪吉玉杰许亮亮施春燕王毓彤韩书广贾翀
Owner NANJING FORESTRY UNIV
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