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A method to simultaneously improve the interfacial strength and toughness of carbon fiber epoxy composites

A composite material, interfacial strength technology, applied in the direction of carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problem of not being able to improve the strength and toughness of the fiber and resin interface at the same time, achieve easy industrial production, improve wettability, repeatable good effect

Active Publication Date: 2020-05-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing carbon fiber surface treatment method can not improve the interface strength and toughness of fiber and resin at the same time, and provide a method for simultaneously improving the interface strength and toughness of carbon fiber epoxy composite materials

Method used

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  • A method to simultaneously improve the interfacial strength and toughness of carbon fiber epoxy composites
  • A method to simultaneously improve the interfacial strength and toughness of carbon fiber epoxy composites
  • A method to simultaneously improve the interfacial strength and toughness of carbon fiber epoxy composites

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Embodiment 1

[0030] 1) Silane coupling agent modified ZrO 2

[0031] ZrO with a particle size of 10-100nm 2 Nanoparticles and ethanol solution were mixed at a mass ratio of 1:20 and magnetically stirred for 2 hours to ensure that ZrO 2 The particles are uniformly dispersed in ethanol solution to obtain ZrO 2 Ethanol solution; according to the mass ratio of 3-aminopropyltriethoxysilane coupling agent: ethanol solution: deionized water = 1:5:0.2, mix the silane coupling agent with the ethanol solution and add deionized water to it magnetically Stir for 10 minutes to promote the hydrolysis of the silane coupling agent to obtain a silane coupling agent mixture; press ZrO 2 The mass ratio of nanoparticles and silane coupling agent is 1:1, and the silane coupling agent mixture is added to the ZrO 2 In the ethanol solution, stir at 60°C for 3h to complete the conversion of the silane coupling agent to ZrO 2 Grafting, the grafted ZrO 2 The particles were washed with water and ethanol respect...

Embodiment 2

[0042] 1) Silane coupling agent modified ZrO 2

[0043] ZrO with a particle size of 10-100nm 2 Nanoparticles and ethanol solution were mixed at a mass ratio of 1:1 and magnetically stirred for 6 hours to ensure that ZrO 2 The particles are uniformly dispersed in ethanol solution to obtain ZrO 2Ethanol solution; according to the mixture of γ-glycidyl etheroxypropyltrimethoxysilane and 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane: ethanol solution: deionized water =1:10:0.3 mass ratio Mix the silane coupling agent with the ethanol solution, then add dropwise deionized water to it and stir magnetically for 5 minutes to promote the hydrolysis of the silane coupling agent to obtain the silane coupling agent mixed solution; according to ZrO 2 The mass ratio of nanoparticles to silane coupling agent is 1:2, and the silane coupling agent mixture is added to the ZrO 2 In the ethanol solution, stir at 60°C for 1h to complete the conversion of the silane coupling agent ...

Embodiment 3

[0052] 1) Silane coupling agent modified ZrO 2

[0053] ZrO with a particle size of 10-100nm 2 Nanoparticles and ethanol solution were mixed at a mass ratio of 1:50 and magnetically stirred for 0.5h to ensure that ZrO 2 The particles are uniformly dispersed in ethanol solution to obtain ZrO 2 Ethanol solution; according to the mass ratio of 3-aminopropyltrimethoxysilane coupling agent: ethanol solution: deionized water = 1:8:0.1, mix the silane coupling agent with the ethanol solution and add deionized water dropwise to it with magnetic stirring 8min to promote the hydrolysis of the silane coupling agent to obtain the silane coupling agent mixture; press ZrO 2 The mass ratio of nanoparticles to silane coupling agent is 1:3, and the silane coupling agent mixture is added to the ZrO 2 In the ethanol solution, stir at 60°C for 2h to complete the conversion of the silane coupling agent to ZrO 2 Grafting, the grafted ZrO 2 The particles were washed with water and ethanol resp...

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Abstract

The invention relates to a method capable of improving interface strength and toughness of a carbon fiber epoxy composite material at the same time. The problem in the existing carbon fiber treatmentmethod that the interface strength and toughness between the carbon fiber and the resin cannot be improved at the same time is solved. The method comprises the following steps: modifying the surface of zirconium oxide (ZrO2) by using a silane coupling agent; uniformly mixing the modified ZrO2, epoxy resin and an organic solvent to prepare a sizing agent; performing agent removing treatment on carbon fiber; enabling the carbon fiber to pass through a slurry tank with the sizing agent according to a dipping method and then drying to complete surface modification on the carbon fiber for the carbon fiber epoxy composite material. According to the method, the interface micro-area is strengthened and toughened by completely utilizing the ZrO2 and uniform distribution of the ZrO2 on the surface of the fiber, strong and weak chemical bonding which is distributed at intervals is built on the interface, the interface strength is improved through construction of chemical bonds and reduction of interface toughness caused by over-strong chemical bonds is avoided; meanwhile, the ZrO2 particles can hinder extension of crack and induce micro-crack, achieves the effect of dispersing the energy of the tip of the main crack and achieves the toughening effect.

Description

technical field [0001] The invention belongs to the field of surface and interface modification of materials, and in particular relates to a method for simultaneously improving the interface strength and toughness of carbon fiber epoxy composite materials. Background technique [0002] Carbon fiber epoxy resin-based composites are widely used in aerospace, transportation, energy, sports and leisure products and other fields due to their high specific strength, high specific modulus, excellent corrosion resistance and weather resistance. The interface is an extremely important microstructure of fiber composites, which plays an important and even decisive role in the performance and service behavior of composites. However, carbon fiber has problems such as low surface energy and chemical inertness, which make it difficult for carbon fiber and resin to fully infiltrate and contact, and the interface formed with resin has low performance and poor stability. To this end, surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/46D06M15/55D06M101/40
CPCD06M11/46D06M15/55D06M2101/40
Inventor 武清赵如意焦通朱建锋秦毅武文玲张佩王雷
Owner SHAANXI UNIV OF SCI & TECH
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