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Carbon Fiber Reinforcement Methods

A technology of carbon fiber and carbon nanotubes, which is applied in the fields of carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of unsatisfactory repair efficiency and high cost, achieve ideal effect and efficiency, increase strength, and solve technical problems.

Inactive Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

It is very gratifying that it is highly targeted for the repair of carbon fiber surface structure defects, but obviously the "repair" efficiency of this method is not ideal, and the cost of industrial application will be higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12

[0019] 1. Preparation of spraying liquid:

[0020] Take the commercially available functionalized carbon nanotubes and the dispersion liquid and mix them in a container according to the required ratio, and then use ultrasonic waves with a frequency of 25kHz for ultrasonic vibration for about 5 hours to fully disperse the carbon nanotubes in the dispersion liquid. Then prepare the spray liquid of the required concentration for subsequent use. The composition of the spraying liquid in each embodiment is shown in Table 1. The diameter distribution of the single-wall carbon nanotubes used is 0.5-5 nm, the diameter distribution of the multi-wall carbon nanotubes is 10-20 nm, and the length distribution is 10-30 μm.

[0021] Table 1.

[0022]

carbon nanotubes

Group content

(wt.%)

Dispersions

Carbon nanotube content

(g / L)

Example 1

carboxylated single-walled carbon nanotubes

5.0

dimethylformamide

45...

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PUM

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Abstract

A method for reinforcing carbon fibers, which uses electrostatic spraying to coat carbon nanotubes on the surface of carbon fibers to compensate for surface structural defects and increase its strength. One of carbon nanotubes, carboxylated carbon nanotubes or aminated carbon nanotubes, the dispersion liquid is one of dimethylformamide, acetone or ethanol; the spray liquid is applied with 10-40kV positive static electricity, and the carbon fiber tow Flattened and grounded to form a spray liquid receiver; the spray liquid is sprayed on the surface of the carbon fiber by electrostatic spraying, and the spray amount is controlled to 1000: (0.4-10) in terms of the weight ratio of carbon fiber to carbon nanotube. The residence time required for carbon fiber to reach the necessary amount of carbon nanotube coating is usually only 0.5 to 5 minutes, and the tensile strength of carbon fiber with increased strength after repair can be increased by more than 100%. The process is simple, the cost is low, the efficiency is high, and industrial application is easy to realize.

Description

technical field [0001] The invention relates to a method for reinforcing carbon fibers, in particular to a method for coating carbon nanotubes on the surface of carbon fibers by an electrostatic spraying method to compensate for surface structural defects and increase the strength of the carbon fibers. Background technique [0002] Carbon fiber can almost be considered as the non-metallic material with the highest specific strength and specific modulus so far, and has been widely used in transportation, sports equipment, construction and even aerospace fields. However, the strength and elastic modulus of existing carbon fiber products are actually far from the theoretical value. Taking the tensile strength as an example, it is generally only 3-5% of the theoretical value. The root cause of this phenomenon is that carbon fibers generally have structural defects, especially acrylonitrile-based carbon fibers, because their precursors are prepared by solution spinning, and the f...

Claims

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Application Information

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IPC IPC(8): D06M11/74D06M101/40
Inventor 程博闻季春晓康卫民陆正鸣黄翔宇严国良朱宗元李全祥刘礼华
Owner CHINA PETROLEUM & CHEM CORP
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