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Method for reinforcing and toughening composite material by constructing dual rigid-flexible structure on surface of carbon fiber

A technology of toughening composite materials and structural reinforcement, applied in the directions of carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of low interface bonding strength, improve interface properties, uniformly transmit and disperse stress, and increase compatibility. Effect

Active Publication Date: 2020-04-28
青岛碳智新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low interfacial bonding strength of existing carbon fiber / epoxy resin composite materials, and provide a method for strengthening and toughening composite materials by constructing a double rigid-flexible structure on the surface of carbon fibers

Method used

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  • Method for reinforcing and toughening composite material by constructing dual rigid-flexible structure on surface of carbon fiber
  • Method for reinforcing and toughening composite material by constructing dual rigid-flexible structure on surface of carbon fiber
  • Method for reinforcing and toughening composite material by constructing dual rigid-flexible structure on surface of carbon fiber

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specific Embodiment approach 1

[0040] Specific implementation mode 1: This implementation mode is a method of constructing a double rigid-flexible structure through the carbon fiber surface to strengthen and toughen the composite material, which is completed according to the following steps:

[0041] 1. Extraction treatment of carbon fiber:

[0042] Using acetone as a cleaning agent to extract the carbon fibers to obtain the extracted carbon fibers;

[0043] 2. Oxidation of carbon fiber:

[0044] Immersing the extracted carbon fibers in a potassium persulfate / silver nitrate mixed aqueous solution to oxidize, then washing and drying to obtain dry oxidized carbon fibers;

[0045] 3. Reduction of carbon fiber:

[0046] Firstly, dry carbon oxide fibers were immersed in THF, and then LiAlH 4 , stirring again, finally adding hydrochloric acid, stirring evenly to obtain reduced carbon fibers; using deionized water to wash the reduced carbon fibers to neutrality, and then vacuum drying to obtain reduced carbon f...

specific Embodiment approach 2

[0058] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, carbon fiber is extracted with acetone as a cleaning agent, which is specifically completed according to the following steps:

[0059] ① Put the carbon fiber into a Soxhlet extractor filled with acetone, and then heat the acetone to 75°C-85°C, the acetone is continuously distilled and condensed in the Soxhlet extractor, so that the impurities on the surface of the carbon fiber are in the distilled acetone It is continuously cleaned, and the cleaning time is 48h to 72h, and the carbon fiber with the epoxy coating removed on the surface is obtained;

[0060] ②. Dry the carbon fiber from which the surface epoxy coating has been removed at a temperature of 70° C. to 80° C. for 2 hours to 4 hours to obtain the carbon fiber after the extraction treatment. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0061] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step two, the carbon fiber after the extraction treatment is immersed in the potassium persulfate / silver nitrate mixed aqueous solution to oxidize, and then cleaning and drying are specifically Done as follows:

[0062] ①. Immerse the extracted carbon fiber in the potassium persulfate / silver nitrate mixed aqueous solution, heat to 60°C-80°C, and then keep the temperature at 60°C-80°C for 1h-2h to obtain the oxidized Carbon fiber; the concentration of potassium persulfate in the described potassium persulfate / silver nitrate mixed aqueous solution is 0.1mol / L~0.2mol / L; the concentration of silver nitrate in the described potassium persulfate / silver nitrate mixed aqueous solution is 0.0001mol / L L~0.05mol / L;

[0063] The volume ratio of the quality of the carbon fiber after the extraction treatment described in step 2 to potassium persulfate / silver nitrate mixed aque...

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Abstract

The invention discloses a method for reinforcing and toughening a composite material by constructing a dual rigid-flexible structure on the surface of a carbon fiber, and relates to a modification method of the carbon fiber. The invention aims at solving a problem of low interface bonding strength of an existing carbon fiber / epoxy resin composite material. The method comprises the following stepsof 1, carrying out extraction treatment on the carbon fiber; 2, oxidizing the carbon fiber; 3, reducing the carbon fiber; 4, oxidizing and grafting a carbon nanotube; and 5, carrying out anionic polymerization on nylon on the surface of the carbon fiber of the grafted carbon nanotube in order to obtain the carbon fiber with the dual rigid-flexible structure on the surface. The interlaminar shear strength, the interfacial shear strength and the impact strength of CF-CNTs-PA6 obtained by the invention are greatly improved. And the method is suitable for modification of the surface of the carbonfiber.

Description

technical field [0001] The invention relates to a modification method of carbon fiber. Background technique [0002] The interface problem is the basis and common research topic for the development of composite materials discipline. However, when the interfacial properties of carbon fiber composite materials are greatly improved, stress concentration will be formed in the interfacial area, resulting in weakened impact strength of the material. Therefore, constructing a gradient modulus interface layer that can uniformly transmit and disperse stress is an effective method for strengthening and toughening composite materials, and it is also an important topic in the current research on carbon fiber surface modification. At present, it is mainly to graft or nano whiskers on the surface of carbon fibers alone, which can improve the interfacial properties of composite materials to a certain extent, but because it is difficult to form modulus matching at the interface, its streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/74D06M15/59C08K9/02C08K9/04C08K7/06C08L63/00C08J5/06D06M101/40
CPCD06M11/74D06M15/59C08K9/02C08K9/04C08K7/06C08J5/06D06M2101/40C08L63/00
Inventor 马丽春冯培峰宋国君
Owner 青岛碳智新材料科技有限公司
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