A method for reinforcing carbon fibers

A carbon fiber, strength technology, applied in the direction of carbon fiber, fiber processing, fiber chemical characteristics, etc., can solve the problem of "repair" efficiency is not ideal and high cost

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

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  • A method for reinforcing carbon fibers

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Embodiment 1～12

[0020] 1. Preparation of spraying liquid:

[0021] Take the commercially available functionalized carbon nanotubes and the dispersion prepared by ionic liquid and water, 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 5 hours to make the carbon nanotubes The tube is fully dispersed in the dispersion liquid, and then prepared into the spray liquid of the required concentration for later 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.

[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 fi...

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Abstract

A carbon fiber reinforcement method, which uses electrostatic spraying to coat carbon nanotubes on the surface of carbon fibers to compensate for surface structural defects and increase its strength, including: preparing a spraying liquid with a dispersion of carbon nanotubes, and the carbon nanotubes are derived from hydroxyl One of carbon nanotubes, carboxylated carbon nanotubes or aminated carbon nanotubes, the dispersion liquid is a mixture of ionic liquid and water, and the ionic liquid is obtained from 1,3-dimethylimidazole p-toluenesulfonate, 1 - One of butyl-3-methylimidazole p-toluenesulfonate, 1-octyl-3-methylimidazole chloride, or 5-bromo-2-methyl-3-nitropyridine; spray application 10-40kV positive electrode static electricity, 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, and the spraying amount is 1000: (0.4-10 based on the weight ratio of carbon fiber to carbon nanotube ). After repairing, the tensile strength of carbon fiber can be increased by more than 100%.

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): D06M11/74D01F11/12D06M101/40
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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