Method for electrochemically modifying surface of ultrasonic-enhanced carbon fiber

A carbon fiber and electrochemical technology, applied in the field of electrochemical modification of carbon fiber surface enhanced by ultrasonic wave, can solve the problems of difficult to control surface uniformity, long processing time, etc., to achieve the improvement of molding processability and overall comprehensive performance, and low production cost , the effect of reducing product cost

Inactive Publication Date: 2013-09-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have improved the surface roughness of carbon fibers to a certain extent, increased the number of surface functional groups, and improved the interlayer strength of carbon fiber composite materials, but these methods have problems such as long processing time and difficult control of surface uniformity. Further exploration of new carbon fiber surface modification methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment adopts the following steps:

[0023] Step 1: Pretreatment of the surface of the carbon fiber material:

[0024] Step 1.1: put the carbon fiber material into the extraction device, extract at the boiling temperature of the acetone solution for 24 hours, and remove the carbon fiber surface coating;

[0025] Step 1.2: Soak the carbon fiber material treated in step 1.1 in deionized water for 12 hours;

[0026] Step 1.3: Vacuum drying the carbon fiber material processed in step 1.2 at 80°C;

[0027] Step 2: Immerse the carbon fiber material treated in step 1 in an electrolytic cell with a concentration of 40wt% nitric acid solution, use the carbon fiber material as the anode of electrochemical oxidation, graphite as the cathode of electrochemical oxidation, and use a regulated DC power supply Control the input current, the current density is 2A / g, and at the same time, under the conditions of ultrasonic power 200W, ultrasonic frequency 100kHz, and water bat...

Embodiment 2

[0030] Step 1: Pretreatment of the surface of the carbon fiber material:

[0031] Step 1.1: put the carbon fiber material into the extraction device, extract it in the acetone solution for 48 hours, and remove the carbon fiber surface coating;

[0032] Step 1.2: Soak the carbon fiber material treated in step 1.1 in deionized water for 18 hours;

[0033] Step 1.3: Vacuum drying the carbon fiber material processed in step 1.2 at 100°C;

[0034] Step 2: Immerse the carbon fiber material treated in step 1 in an electrolytic cell with a concentration of 30wt% sulfuric acid solution, use the carbon fiber material as the anode of electrochemical oxidation, graphite as the cathode of electrochemical oxidation, and use a regulated DC power supply Control the input current, the current density is 1A / g, and at the same time, under the conditions of ultrasonic power 600W, ultrasonic frequency 60kHz, and water bath temperature 20°C, ultrasonic oscillation for 10 minutes produces surface m...

Embodiment 3

[0037] Step 1: Pretreatment of the surface of the carbon fiber material:

[0038] Step 1.1: put the carbon fiber material into the extraction device, extract at the boiling temperature of the acetone solution for 36 hours, and remove the carbon fiber surface coating;

[0039] Step 1.2: Soak the carbon fiber material treated in step 1.1 in deionized water for 12 hours;

[0040] Step 1.3: Vacuum drying the carbon fiber material processed in step 1.2 at 120°C;

[0041] Step 2: Immerse the carbon fiber material treated in step 1 in an electrolytic cell with a concentration of 20wt% phosphoric acid solution, use the carbon fiber material as the anode of electrochemical oxidation, graphite as the cathode of electrochemical oxidation, and use a regulated DC power supply Control the input current, the current density is 2A / g, and at the same time, under the conditions of ultrasonic power 1000W, ultrasonic frequency 40kHz, and water bath temperature 40°C, ultrasonic oscillation for 15...

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PUM

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Abstract

The invention provides a method for electrochemically modifying surface of ultrasonic-enhanced carbon fiber. The method comprises the following steps of: firstly, pretreating the surface of the carbon fiber material, secondarily, soaking the pretreated carbon fiber material into an electrolytic bath filled with strong electrolyte solution; and by taking the carbon fiber material as an electrochemically oxidized anode and graphite as an electrochemically oxidized cathode, guiding in current through control of a voltage-stabilizing power supply, wherein the current intensity is 1A/g-2A/g; and under the conditions of ultrasonic power of 200W-2000W, ultrasonic frequency of 20kHz-100kHz, and water bath temperature of 20 DEG C-70 DEG C, carrying out ultrasonic oscillation for three minutes to 15 minutes to produce surface modification, and finally washing and drying to obtain surface-modified carbon fiber. With the method, the surface roughness of the carbon fiber can be increased, the wetting property of the carbon fiber can also be improved due to introduction of polar group into the surface of the fiber, the binding property between the carbon fiber and a resin matrix can be enhanced, and the interface property of binding the carbon fiber with other materials can be increased.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber surface modification, in particular to a method for electrochemically modifying the surface of carbon fiber using ultrasonic waves. Background technique [0002] Carbon fiber refers to a fiber material that has been carbonized at a high temperature and contains more than 85% carbon, including carbon fiber and graphite fiber. Carbon fiber is a fiber with a carbon content of 85% to 95% after the organic fiber is treated at 1000-2300°C; graphite fiber is a fiber with a carbon content of more than 98% after the organic fiber is treated at a temperature above 2300°C. As a high-performance fiber, carbon fiber has become the most important reinforcing material for resin-based composite materials in recent years because of its high specific strength, high specific modulus, small thermal expansion coefficient, low friction coefficient, and good low temperature resistance. In aerospace components and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M10/06D06M11/65D06M11/55D06M11/70D06M11/38D06M13/127
Inventor 邓超蒋建军方良超史景文王俊彪
Owner NORTHWESTERN POLYTECHNICAL UNIV
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