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Modified carbon fiber as well as preparation method and application thereof

A technology of carbon fiber and modified carbon, which is applied in the direction of carbon fiber, fiber treatment, ultrasonic/sonic fiber treatment, etc., and can solve the problem of low interface adhesion

Pending Publication Date: 2022-06-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After treatment, the content of oxygen-containing functional groups such as hydroxyl group and carboxyl group on the surface of carbon fiber can be increased, and the surface energy of the fiber can be increased, but the bonding between the fiber and the matrix is ​​still mostly dependent on weak physical adsorption, and the interface bonding is still low.

Method used

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  • Modified carbon fiber as well as preparation method and application thereof
  • Modified carbon fiber as well as preparation method and application thereof
  • Modified carbon fiber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) The carbon fiber is treated with plasma to form hydroxyl groups on the surface of the carbon fiber;

[0037] (2) Mix methanol and water with a mass ratio of 1:1 to obtain a mixed system, then adjust the pH of the system to 3 with acetic acid, put the configured mixed system into a three-necked flask, and add dropwise with stirring the mass fraction of 0.5% methacryloyloxypropyltrimethoxysilane (MPS) was hydrolyzed at 25° C. for 30 minutes to obtain a hydroxyl-rich silane aqueous solution with a large degree of hydrolysis and a small degree of polycondensation.

[0038](3) adding the carbon fiber after the plasma treatment obtained in step (1) to the hydroxyl-rich silane aqueous solution obtained in step (2), setting the temperature of the oscillating water bath to 50° C., reacting for 20 min, and then alternately cleaning excess water with methanol and water Siloxane to obtain secondary functionalized carbon fibers.

[0039] (4) heating the secondary functionalized...

Embodiment 2

[0042] (1) The carbon fiber is treated with plasma to form hydroxyl groups on the surface of the carbon fiber;

[0043] (2) Mix methanol and water according to the mass ratio of 20:1 to obtain a mixed system, then adjust the pH of the system to 3 with acetic acid, place the configured mixed system in a shaking water bath, and add the mass fraction dropwise with stirring It is 5% methacryloyloxypropyltrimethoxysilane (MPS), hydrolyzed at 40° C. for 3 h to obtain a hydroxyl-rich silane aqueous solution.

[0044] (3) adding the plasma-treated carbon fiber obtained in step (1) to the hydroxyl-rich silane aqueous solution obtained in step (2), reacting for 20 min, and then alternately washing excess siloxane with methanol and water to obtain secondary functionalization of carbon fiber.

[0045] (4) heating the secondary functionalized carbon fiber at 150° C. for 5 min to complete the polycondensation of siloxane on the secondary functionalized carbon fiber and remove the water and...

Embodiment 3

[0048] (1) Anodizing the carbon fibers with ammonium bicarbonate as the electrolyte solution to form hydroxyl groups on the surface of the carbon fibers;

[0049] (2) Mix ethanol and water in a mass ratio of 10:1 to obtain a mixed system, then adjust the pH of the system to 3 with acetic acid, put the configured mixed system into a three-necked bottle, and add dropwise with stirring the mass fraction of 2% aminopropyltriethoxysilane (APTES) was hydrolyzed at 25° C. for 3 h to obtain a hydroxyl-rich silane aqueous solution.

[0050] (3) adding the carbon fiber after the plasma treatment obtained in step (1) to the hydroxyl-rich silane aqueous solution obtained in step (2), setting the temperature of the oscillating water bath to be 50° C., reacting for 20 min, and then alternately cleaning excess water with ethanol and water Siloxane to obtain secondary functionalized carbon fibers.

[0051] (4) heating the secondary functionalized carbon fiber at 100° C. for 40 min to complet...

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Abstract

The invention discloses a modified carbon fiber and a preparation method and application thereof, and the method comprises the following steps: (1) carrying out first treatment on the surface of the carbon fiber so as to form hydroxyl and / or carboxyl on the surface of the carbon fiber; (2) hydrolyzing siloxane in a mixed system containing water and alcohol so as to form silicon hydroxyl on the siloxane; (3) mixing the carbon fiber obtained in the step (1) with the reaction system obtained in the step (2), and then carrying out first heating to obtain a secondary functionalized carbon fiber; and (4) carrying out secondary heating on the secondary functionalized carbon fiber, so that siloxane on the secondary functionalized carbon fiber is subjected to polycondensation, and removing the solvent to obtain the modified carbon fiber. According to the modified carbon fiber obtained by the method, an effective transition layer-matrix material interface is constructed by utilizing physical and chemical effects between polysiloxane on the modified carbon fiber and a matrix, so that an effective interface with strong bonding performance is constructed.

Description

technical field [0001] The invention belongs to the field of carbon fiber surface treatment, and in particular relates to a modified carbon fiber and a preparation method and application thereof. Background technique [0002] Composite materials are generally composed of matrix and reinforcing phase or functional phase, which can complement each other's strengths and weaknesses between raw material components, so as to obtain new materials with excellent comprehensive properties. Carbon fiber is an ideal reinforcement for composites due to its high specific strength, high specific modulus, low density and corrosion resistance. The weak interaction with the matrix material leads to the debonding of the fiber and the matrix during the stress-stretching process of the composite material, and the stress transfer cannot be carried out well, so that the advantages of the composite material cannot be fully utilized. Therefore, how to enhance the bonding between the carbon fiber an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M10/02D06M10/10D06M15/643C08J5/06D06M101/40
CPCD06M15/643D06M10/10D06M10/025D06M15/6436C08J5/06D06M2101/40
Inventor 曹维宇董瑞豪徐樑华高爱君王梦梵李常清童元建赵振文王宇
Owner BEIJING UNIV OF CHEM TECH
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