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A method for increasing the strength of carbon fiber

A carbon fiber and strength technology, used in carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of high cost and unsatisfactory "repair" efficiency.

Inactive Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP
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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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  • A method for increasing the strength of carbon fiber

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Embodiment 1～12

[0019] 1. Preparation of spraying liquid:

[0020] Take the commercially available carbon nanotubes and the dispersion liquid prepared by ionic liquid and water and mix them in a container according to the required ratio, and then use ultrasonic waves with a frequency of 25kHz to perform ultrasonic vibration for about 4 hours, so that the carbon nanotubes are dispersed Fully dispersed in the liquid, then prepared into the required concentration of spray liquid for use.

[0021] 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.

[0022] Table 1.

[0023]

[0024] *The weight ratio of single-walled carbon nanotubes to multi-walled carbon nanotubes is 1:1.

[0025] 2. Electrostatic spraying of carbon nanotubes on the surface of carbon fiber

[0026] The ...

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Abstract

A method for improving the strength of carbon fibers, which uses an electrostatic spraying method to coat carbon nanotubes on the surface of carbon fibers to make up for their surface structural defects, comprising: preparing a dispersion liquid for carbon nanotubes into a spraying liquid, and the dispersion liquid is a mixture of ionic liquid and water , the ionic liquid is taken from 1,3-dimethylimidazole-p-toluenesulfonate, 1-butyl-3-methylimidazole-p-toluenesulfonate, 1-octyl-3-methylimidazole chloride or 5- One of bromo-2-methyl-3-nitropyridine; the spray liquid is applied with 10-40kV positive static electricity, and the carbon fiber tow is flat and grounded to form a spray liquid receiver; the spray liquid is sprayed on the surface of the carbon fiber by electrostatic spraying, Based on the weight ratio of carbon fibers to carbon nanotubes, the spraying amount is controlled to be 1000:(0.5-10). The invention has the advantages of simple process, low cost, high efficiency, good repairing effect of carbon fiber surface structural defects and the like, and is easy to realize industrial application.

Description

technical field [0001] The invention relates to a method for improving the strength of 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, thereby improving the strength of 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 spi...

Claims

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Application Information

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IPC IPC(8): D06M11/74D06M13/352D06M13/392D06M101/40
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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