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A method for direct green grafting of carbon nanofibers on the surface of carbon fibers

A technology of carbon nanofiber and carbon fiber, which is applied in the direction of carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problem of low interface bonding strength, achieve low cost, improve interface bonding performance, and increase graft density.

Active Publication Date: 2019-09-13
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

[0004] The purpose of the present invention is to solve the problem of low interfacial bonding strength of existing carbon fiber composite materials, and provide a method for directly green grafting carbon nanofibers on the surface of carbon fibers

Method used

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  • A method for direct green grafting of carbon nanofibers on the surface of carbon fibers
  • A method for direct green grafting of carbon nanofibers on the surface of carbon fibers
  • A method for direct green grafting of carbon nanofibers on the surface of carbon fibers

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specific Embodiment approach 1

[0048] Embodiment 1: This embodiment is a method of directly green grafting carbon nanofibers on the surface of carbon fibers, which is specifically completed according to the following steps:

[0049] 1. Extraction treatment of carbon fiber:

[0050] 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 2h to 8h, and then the carbon fiber is taken out to obtain the carbon fiber with the surface impurities removed;

[0051] ② Put the carbon fiber with surface impurities removed into a supercritical device, and then soak it in a supercritical acetone-water system with a temperature of 350°C-370°C and a pressure of 8MPa-14MPa for 20min-30min, and use the supercritical acetone-water system Remove the epoxy coat...

specific Embodiment approach 2

[0082] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the dry carbon oxide fiber and LiAlH described in step three 4 The mass ratio is (0.3~0.4):(0.1~0.2). Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0083] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the mass of the dry carbon dioxide fiber described in step three and the volume ratio of the hydrochloric acid whose concentration is 1mol / L~1.5mol / L are (0.3g~0.4g): (100mL~150mL). Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for directly green grafting a carbon nanofiber on a carbon fiber surface and relates to the method for grafting on the carbon fiber surface. The invention aims to solve the problem of low interface bonding strength of the present carbon fiber composite. The method comprises the following steps: 1) extracting the carbon fiber; 2) oxidizing; 3) reducing the carbon fiber; 4) oxidizing the carbon nanofiber; and 5) grafting, thereby acquiring the carbon fiber with the carbon nanofiber grafted on the surface. The surface of the carbon fiber with the carbon nanofiber grafted on the surface prepared according to the invention is increased to 66.13mN / m-69mN / m from 30.13mN / m, the interfacial shear strength is increased to 86.3MPa-89.6MPa from precursor 49.5MPa and the tensile strength is not changed. The method provided by the invention is suitable for the preparation of the carbon fiber with the carbon nanofiber grafted on the surface.

Description

technical field [0001] The invention relates to a method for grafting carbon fiber surface. Background technique [0002] Carbon fiber (CFs) is widely used as a reinforcing filler for polymer-based composite materials due to its high specific strength, high specific stiffness, chemical corrosion resistance, high temperature resistance, and excellent electrical and thermal conductivity. King of new materials". Lightweight and high-strength carbon fiber reinforced resin-based composite materials are the most used high-performance structural materials in aerospace and other military industries. They can reduce the weight of passenger aircraft to reduce fuel consumption, increase the operating payload of passenger aircraft, save energy and reduce pollutants. emissions. However, the carbon fiber surface with very little polar group content, small specific surface area and chemical inertness has poor wettability with the epoxy resin matrix, and it is difficult to form effective ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/74D06M101/40
Inventor 马丽春宋国君王刚陈道远郭延金蔡延豪
Owner 青岛碳智新材料科技有限公司
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