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Method for modifying carbon fiber surface

A modification method, carbon fiber technology, applied in fiber processing, textile and papermaking, physical processing, etc., can solve the problems of long process route, unfriendly environment, difficult industrialized production fields, etc., achieve environmental friendliness, improve interface adhesion performance, low cost effect

Active Publication Date: 2013-08-14
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that the process route is too long, the use of reagents such as acetone, concentrated nitric acid, etc. is not environmentally friendly, and it is difficult to extend to the field of industrial production

Method used

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  • Method for modifying carbon fiber surface

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 0.01 g of graphene oxide, dissolve it in 1 liter of deionized aqueous solution, use 0.1 mol / L NaOH solution to adjust the pH value of the solution to 10.0; then mechanically stir at 100 rpm for 2 hours to make it evenly dispersed.

[0041] Take the mesophase pitch-based carbon fiber and wind it on the tetrafluoroethylene plate as the anode of the CHI660A electrochemical workstation, the platinum wire as the cathode, and the Ag / AgCl electrode as the reference electrode. The carbon fiber was immersed in the graphene oxide dispersion solution, the solution temperature was 20°C, and the electrophoretic coating was performed by applying a voltage of 10 volts for 10 minutes, and the distance between the working electrode and the counter electrode was 5 cm. Then the carbon fiber was taken out, and stayed in a heating furnace at 80° C. for 60 minutes, the atmosphere was air, and the modified carbon fiber was obtained. The tensile strength of carbon fiber before modificati...

Embodiment 2

[0043] Weigh 2 grams of graphene oxide, dissolve it in 1 liter of deionized water, and adjust the pH value of the solution to 8.0 with 0.1 mol / liter NaOH solution; then mechanically stir at a speed of 20 rpm for 60 hours to make it evenly dispersed.

[0044] Take polyacrylonitrile carbon fiber and wind it on a tetrafluoroethylene plate as the anode of CHI660A electrochemical workstation, platinum wire as cathode, and Ag / AgCl electrode as reference electrode. The carbon fiber is immersed in the graphene oxide dispersion, the solution temperature is 60 ° C, and the electrophoretic coating is carried out for up to 3 hours by applying a voltage of 1 volt, and the distance between the working electrode and the counter electrode is 10 cm, and the process is assisted by ultrasonic waves. dispersion. Then the carbon fiber was taken out, and stayed in a heating furnace at 600° C. for 10 seconds under an ammonia atmosphere to obtain a modified carbon fiber. The tensile strength of the ...

Embodiment 3

[0046] Weigh 1 gram of graphene oxide, dissolve it in 1 liter of deionized water, adjust the pH value of the solution to 13.0 with 0.1 mol / L NaOH solution; then stir it with a mechanical stirrer at a speed of 300 rpm for 1 hour to make it evenly dispersed .

[0047] The graphene oxide emulsion is placed in a plexiglass electrolytic cell, the carbon fiber is used as the anode, the graphite plate is used as the cathode, and a DC power supply is provided by a DC stabilized current power supply. The polyacrylonitrile carbon fiber tow is continuously passed through the electrolytic cell through the guide roller, the solution temperature in the electrolytic cell is 80 ° C, and the distance between the working electrode and the counter electrode is 20 cm by applying a voltage of 60 volts for 5 seconds; After coming out of the tank, it passes through a high-temperature heat treatment furnace continuously. The temperature in the furnace is 600°C, the atmosphere is nitrogen, and the res...

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Abstract

The invention discloses a method for modifying a carbon fiber surface. The method comprises the following steps of: dissolving graphene oxide in water, adjusting a pH value to 8.0-13.0, dispersing by mechanical agitation or an ultrasonic wave to obtain graphene oxide water solution; stewing the graphene oxide water solution into an electrolytic cell, taking a carbon fiber as an anode material of an electrode and conductive metal or a graphite material as a cathode material; exerting voltage or electricity on a carbon fiber electrode by a potentiostatic method or a galvanostatic method; and carrying out thermal treatment on the carbon fiber on which the graphene oxide is coated in a heating furnace to obtain the modified carbon fiber. The method has the advantages of being simple and practical, free of pollution, and industrial.

Description

technical field [0001] The invention relates to a method for surface treatment of carbon fibers. Background technique [0002] Carbon fiber has a series of excellent properties such as high specific strength, high specific modulus, low density, high temperature resistance, fatigue resistance, creep resistance, easy conductivity, heat transfer and small thermal expansion coefficient, and is widely used in carbon fiber reinforced resin matrix composites. However, the surface of carbon fiber is composed of turbostratic graphite structure, which is chemically inert, resulting in weak interfacial adhesion between carbon fiber and resin matrix in carbon fiber reinforced resin matrix composites. Surface treatment of carbon fibers can better solve the problem of surface inertness. However, although the surface treatment of carbon fibers can improve the surface chemical activity of carbon fibers to a certain extent, it lacks the obvious decline in the mechanical properties...

Claims

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Application Information

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IPC IPC(8): D06M10/06C25D11/02
Inventor 吴刚平吕春祥黄胜云
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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