Method of improving interface bonding performance of carbon fiber enhanced epoxy resin-based composite material based on curing agent modified sizing agent

A technology of epoxy resin and composite materials, applied in the direction of carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of unsuitable industrial production, complex technological process, toxic human body and environment, etc., and achieve good economic benefits and industrial Application prospect, universal adaptability, low cost effect

Active Publication Date: 2019-02-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can improve the interfacial bonding properties of carbon fiber reinforced resin-based composites, they are often accompanied by complex processing procedures, long time, severe reactions, and processes that are toxic to humans and the environment, and are not suitable for industrial production. Wastes a lot of energy and resources and often results in a reduction in carbon fiber strength

Method used

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  • Method of improving interface bonding performance of carbon fiber enhanced epoxy resin-based composite material based on curing agent modified sizing agent
  • Method of improving interface bonding performance of carbon fiber enhanced epoxy resin-based composite material based on curing agent modified sizing agent
  • Method of improving interface bonding performance of carbon fiber enhanced epoxy resin-based composite material based on curing agent modified sizing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Preparation of curing agent modified sizing agent

[0044] Get 1% thermosetting epoxy resin and 99% organic solvent acetone magnetically stirred by mass percentage for 10min to obtain epoxy sizing agent solution;

[0045] Then add an amine curing agent to the epoxy sizing agent solution by 15% of the stoichiometric ratio of the epoxy resin and stir magnetically for 20 minutes to obtain a sizing agent solution modified by the curing agent;

[0046] 2) Carbon fiber surface remover

[0047] Using acetone as a solvent, the carbon fiber was condensed and refluxed at 80°C for 24h by Soxhlet extraction, and then dried at 60°C for 3h;

[0048] 3) carbon fiber surface sizing treatment

[0049] Using the impregnation method, step 2) the carbon fiber after the agent is removed is immersed in a slurry tank equipped with a sizing agent solution for 20 seconds, and then dried at 60 ° C for 3 hours, that is, the surface sizing treatment of the carbon fiber used in the carbon fibe...

Embodiment 2

[0057] 1) Preparation of curing agent modified sizing agent

[0058] Get 1% thermosetting epoxy resin and 99% organic solvent acetone magnetically stirred by mass percentage for 10min to obtain epoxy sizing agent solution;

[0059] Then add an amine curing agent to the epoxy sizing agent solution by 15% of the stoichiometric ratio of the epoxy resin and stir magnetically for 20 minutes to obtain a sizing agent solution modified by the curing agent;

[0060] 2) Carbon fiber surface remover

[0061] Using acetone as a solvent, the carbon fiber was condensed and refluxed at 80°C for 24h by Soxhlet extraction, and then dried at 60°C for 3h;

[0062] 3) carbon fiber surface sizing treatment

[0063] Using the impregnation method, step 2) the carbon fiber after the agent is removed is immersed in a slurry tank equipped with a sizing agent solution for 20 seconds, and then dried at 60 ° C for 3 hours, that is, the surface sizing treatment of the carbon fiber used in the carbon fibe...

Embodiment 3

[0070] 1) Preparation of curing agent modified sizing agent

[0071] Get 0.5% thermosetting epoxy resin and 99.5% organic solvent tetrahydrofuran by mass percentage and mechanically stir for 8 minutes to obtain epoxy sizing agent solution;

[0072] Then add an acid anhydride curing agent to the epoxy sizing agent solution by 30% of the stoichiometric ratio of the epoxy resin and mechanically stir for 10 minutes to obtain a sizing agent solution modified by the curing agent;

[0073] 2) Carbon fiber surface remover

[0074] Using acetone as solvent, the carbon fiber was condensed and refluxed at 70°C for 48h by Soxhlet extraction, and then dried at 80°C for 2h;

[0075] 3) carbon fiber surface sizing treatment

[0076] Using the impregnation method to dip the carbon fiber after step 2) in a slurry tank equipped with a sizing agent solution for 30 seconds and then dry it at 70° C. for 3 hours to complete the surface sizing treatment of the carbon fiber used in the carbon fiber...

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Abstract

The invention relates to a method of improving interface bonding performance of a carbon fiber enhanced epoxy resin-based composite material based on a curing agent modified sizing agent. The method comprises the following steps: mixing a curing agent, epoxy resin and an organic solvent uniformly to obtain the sizing agent; removing agents of carbon fibers; passing the carbon fibers to a slurry groove filled with the sizing agent by adopting an impregnating method and drying the carbon fibers; carrying out temperature treatment on the sized carbon fibers; and then compounding the carbon fiberswith an epoxy resin matrix to prepare the carbon fiber enhanced epoxy resin-based composite material. Under the premise of not losing the mechanical property of the carbon fibers, an interface area,the crosslinking density of which is changed gradiently is formed between the fibers and the resin, the interaction degree between the sizing agent and the active groups on the surfaces of the fibersis increased, the inner stress is uniformly transferred in the composite material, and the interface bonding performance of the composite material is improved. The method has the advantages of being simple and feasible, good in repeatability, low in cost, high in efficiency, suitable for industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of surface and interface modification application of materials, and in particular relates to a method for improving the interfacial bonding performance of carbon fiber-reinforced epoxy resin-based composite materials based on a curing agent modified sizing agent. Background technique [0002] Carbon fiber reinforced resin matrix composites are widely used in aerospace, energy, electronics, civil engineering, high-end sports and leisure products and other fields due to their excellent specific strength, specific modulus, corrosion resistance, and electrical and thermal conductivity. Consumption of energy resources and increasing environmental pollution, carbon fiber reinforced resin matrix composites are highly expected to solve the above problems by reducing weight, improving fuel efficiency and reducing carbon emissions. However, the characteristics of low surface energy and poor hydrophilicity of carbon fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/06C08L63/00C08K7/06D06M15/55D06M101/40
CPCC08J5/06C08J2363/00C08K7/06D06M15/55D06M2101/40
Inventor 武清赵如意杨欣张佩秦毅方园赵婷朱剑锋
Owner SHAANXI UNIV OF SCI & TECH
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