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Methods of Improving the Strength of Carbon Fiber

A carbon fiber and strength technology, 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, improve strength, and increase strength.

Inactive Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • Methods of Improving the Strength of Carbon Fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1～12

[0022] 1. Carbon fiber surface functionalization treatment

[0023] The self-produced unglued PAN-based carbon fiber was used for the test. The specification of the carbon fiber was: 3K, and the average diameter of the single fiber was 7.5 μm. The carbon fiber is soaked in the nitric acid aqueous solution of the required concentration, and the soaking temperature and bath ratio are controlled. After the set soaking time, the carbon fiber is washed with deionized water until the washing liquid is neutral. The soaking process conditions of each embodiment are shown in Table 1.

[0024] Table 1.

[0025] concentration of nitric acid solution

(mol / L)

bath ratio *

(weight ratio)

soaking temperature

(℃)

Soaking time

(hr)

Example 1

17.9

14∶1

121

2.1

Example 2

17.4

15∶1

122

2.5

Example 3

20.0

10∶1

100

0.5

Example 4

19.2

11∶...

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Abstract

A method for improving the strength of carbon fibers, comprising: 1) soaking the carbon fibers in an aqueous solution of nitric acid, washing the carbon fibers with deionized water until the washing liquid is neutral after soaking; 2) preparing a carbon nanotube dispersion into a spraying liquid, carbon The nanotubes are functionalized carbon nanotubes, which are obtained from hydroxylated 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-butyl-3-methylimidazole p-toluenesulfonate, 1-octyl-3-methylimidazole chloride or 5-bromo-2-methyl-3 - One of the nitropyridines, the content of carbon nanotubes in the spraying liquid is 16-48g / L; 3) The spraying liquid is applied with positive static electricity of 10-40kV, and the carbon fiber tow is flattened and grounded to form a spraying liquid acceptor, and then passes through Electrostatic spraying sprays the spray liquid on the carbon fiber surface. The tensile strength of carbon fiber can be increased by more than 100%.

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 and increase 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 spinning,...

Claims

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Application Information

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IPC IPC(8): D06M11/64D06M11/74D06M13/352D06M13/392D06M101/40
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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