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Anionic grafting method for modification of aramid fiber surface

A fiber surface, modified aramid fiber technology, applied in fiber processing, textiles and papermaking, etc., can solve the problems of poor interfacial bonding and harsh processing conditions

Inactive Publication Date: 2008-02-06
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention solves the problems of poor interface binding and harsh treatment conditions existing in the existing Kevlar fiber surface modification method, and provides a method for modifying the surface of aramid fiber by anion grafting method

Method used

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  • Anionic grafting method for modification of aramid fiber surface
  • Anionic grafting method for modification of aramid fiber surface
  • Anionic grafting method for modification of aramid fiber surface

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Experimental program
Comparison scheme
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Embodiment Construction

[0012] Processing method of the present invention is as follows:

[0013] 1. Surface treatment of Kevlar fiber:

[0014] Use toluene as a solvent to extract and treat the short fibers cut into 5mm-6mm for 18-24 hours to remove impurities on the surface of the fibers, and then dry the surface-treated Kevlar fibers in vacuum for later use.

[0015] 2. Hydrolysis of Kevlar fiber:

[0016] A certain amount of surface-treated Kevlar fiber is placed in 8-12% NaOH-ethanol solution for hydrolysis reaction for 12-16 hours. The temperature of the solution is controlled at about 90-100 ° C. The product is washed until neutral, and then vacuum-dried for use. The reaction mechanism is as follows:

[0017]

[0018] 3. Adipoyl chloride modification of Kevlar fiber surface and caprolactam end-capping stabilization treatment:

[0019] Put 2-5g of hydrolyzed Kevlar fibers in a three-necked flask, use 150-250ml of toluene as solvent, add 3.00ml-5.00ml of adipoyl chloride, react at 110°C-14...

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Abstract

The present invention relates to one kind of anionic grafting process of modifying aramid fiber surface. During preparing composite Kevlar fiber / PA6 material, the Kevlar fiber is first stabilizing treated with caprolactam and then has the caprolactam monomer in the surface anion grafting polymerized to form the grafted polymer the same type as that in the matrix PA6 resin. The surface modified Kevlar fiber and the matrix PA6 resin have excellent compatibility, and this results in raised tensile strength, bending strength, impact strength and other mechanical performance of the composite material. The composite Kevlar fiber / PA6 material may be used in aeronautics, astronautics, military, automobile, mechanical, electronic, electrical, petrochemical and other fields.

Description

Technical field: [0001] The invention relates to a method for modifying the surface of aramid fiber (Kevlar fiber) by anion grafting method. Background technique: [0002] At present, the Kevlar fiber surface modification technology mainly includes: surface coating method, plasma surface modification technology, gamma ray radiation method, ultrasonic impregnation modification technology, chemical modification technology, etc. [0003] Surface coating method: Coating a flexible interface layer on the surface of Kevlar fiber that is conducive to stress relaxation can improve the interface chemistry and physical interaction between the fiber and the matrix resin, thereby improving the performance of its composite material, but the effect lasts for a short time and the coating The thickness is not well controlled. [0004] Plasma surface modification technology: It is carried out by using plasma to initiate the free radical reaction of polymers. At present, most of the methods...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M14/16
Inventor 郑玉婴王灿耀董美斌张星
Owner FUZHOU UNIV