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Surface grafting modified aramid fiber and preparation method thereof

A surface graft modification, aramid fiber technology, applied in the direction of fiber treatment, fiber type, textile and papermaking, etc., can solve the problems of weak force, lifting, poor UV resistance of aramid fiber, etc., to improve the reaction Activity, improve UV resistance, reduce damage effect

Inactive Publication Date: 2013-07-31
SUZHOU UNIV +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, these chemical grafting modifications only introduce small molecular compounds with monofunctional groups on the surface of the fiber, so they can only improve the surface adhesion of the fiber, which is not conducive to the improvement of the comprehensive performance of the aramid fiber and its composite materials.
[0005] Although the poor UV radiation resistance of aramid fiber is currently recognized as a fact (see literature ① Xiaoyan Liu, Weidong Yu, Ning Pan. Evaluation of high performance fabric under light irradiation. Journal of Applied Polymer Science, 2011, 120: 552– 556. ②Huapeng Zhang, Jianchun Zhang, Jianyong Chen, Xinmin Hao, Shanyuan Wang, Xinxing Feng, Yuhai Guo. Effects of solar UV irradiation on the tensile properties and structure of PPTA fiber, 2006, 91: 2761-2767), but it involves improving There are few studies on the anti-ultraviolet radiation of aramid fibers, and most of the existing research results are to use the sol-gel method to coat a layer of colloid with inorganic nanoparticles on the surface of aramid fibers to improve the anti-ultraviolet properties of aramid fibers. (See literature ①Xiaoyan Liu, Weidong Yu, Peng Xu. Improving the photo-stability of high performance aramid fibers by sol-gel treatment, Fibers and Polymers, 2008, 455-460.②Yanjun Xing, Xin Ding. UV photo-stabilization of tetrabutyl titanate for aramid fibers via sol–gel surface modification. Journal of Applied Polymer Science, 2007, 103: 3113–3119)
However, since there is no covalent bond between the inorganic nanoparticle colloidal coating and the surface of the aramid fiber, the force obtained by relying on the mechanical chelation force between the two is relatively weak. It flakes easily, so this method is not conducive to imparting long-lasting UV resistance to aramid fibers

Method used

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  • Surface grafting modified aramid fiber and preparation method thereof
  • Surface grafting modified aramid fiber and preparation method thereof
  • Surface grafting modified aramid fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Put 0.5g para-aramid fiber (Kevlar-49, diameter 14.62μm, density 1.44g / cm 3 , produced by DuPont, USA) was placed in 150mL acetone and heated to reflux for 3 hours. After the reflux is finished, the fiber is taken out and soaked in 150 mL of deionized water for 3 hours. Then the fibers were taken out and dried in vacuum at 80° C. for 12 hours to obtain clean aramid fibers.

[0028] 2. Pretreatment of aramid fiber

[0029] Mix 10mL of concentrated nitric acid, 200mL of acetic anhydride and 50mL of glacial acetic acid to obtain a mixed acid solution. Add 0.5 g of the clean aramid fiber obtained in step 1 into the mixed acid solution, and react at 10° C. for 6 h. After the reaction, the fiber is taken out, washed and dried to obtain the aramid fiber with nitro groups on the surface.

[0030]200mL of tetrahydrofuran and 200mL of deionized water were used to form a mixed solvent, and 1.5g of potassium dihydrogen phosphate and 0.2g of dipotassium hydrogen phosphate...

Embodiment 2

[0035] 1. Pretreatment of aramid fiber

[0036] Mix 20mL of concentrated nitric acid, 2mL of concentrated sulfuric acid and 200mL of acetic anhydride to obtain a mixed acid solution. Add 0.5 g of the clean aramid fiber prepared in Example 1 into the mixed acid solution, and react at 10° C. for 4 hours. After the reaction, the fiber is taken out, washed and dried to obtain the aramid fiber with nitro groups on the surface.

[0037] Mix 300ml of deionized water and 80mL of hydrogen peroxide to prepare a reducing medium. Add 0.5 g of aramid fibers with nitro groups on the surface to the reducing medium, then add 3.8 g of stannous chloride, stir and react at 60° C. for 12 hours, take out the fibers, wash with water, and dry to obtain amino aramid fibers. Measured-NH 2 The content is 3.87wt%.

[0038] 2. Put 0.5g of the aramid fibers with amino groups obtained in step 1 of this embodiment, 25g of γ-glycidyl etheroxypropyl trimethoxysilane and 0.015g of sodium hydroxide into a r...

Embodiment 3

[0042] 1. Pretreatment of aramid fiber

[0043] Mix 10 mL of concentrated nitric acid and 200 mL of acetic anhydride to prepare a mixed acid solution, add 0.5 g of the clean aramid fiber prepared in Example 1 into the mixed acid solution, and react at 10°C for 5 hours. After the reaction, the fiber is taken out, washed and dried to obtain the aramid fiber with nitro groups on the surface.

[0044] Add 2.4 g of potassium dihydrogen phosphate and 1.2 g of dipotassium hydrogen phosphate to 400 ml of tetrahydrofuran to prepare a reducing medium. Add 0.5 g of aramid fibers with nitro groups on the surface to the reducing medium, then add 2.8 g of sodium borohydride, stir and react at 30° C. for 24 hours, take out the fibers, wash them with water, and dry them to obtain amino aramid fibers. Measured-NH 2 The content is 4.63wt%.

[0045] 2. Put 0.5g of the aramid fibers with amino groups obtained in Step 1 of this embodiment, 120g of γ-glycidyl etheroxypropyl trimethoxysilane and ...

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Abstract

The invention relates to a surface grafting modified aramid fiber and a preparation method of the fiber. The method comprises the following steps of: mixing gamma-glycidoxypropyltrimethoxysilane with the aramid fiber with amino on the surface, placing the above mixture into a mixed solution of gamma-methacryloxypropyltrimethoxylsilane and another alkoxy silane, adding deionized water and an organic solvent into the resulting product, and carrying out cleaning and drying after the reaction ends to obtain hyperbranched polysiloxane modified aramid fiber, wherein the surface of the obtained fiber is connected with methacryloxy and another active functional group through chemical bonds. The surface of the fiber provided by the invention not only has the group capable of resisting strong ultraviolet irradiation, but also has the active functional group with high reactivity, as well as is improved in interface bond performance with a resin matrix; the types of the active functional groups can also be changed by regulating process conditions to adapt to reactions with a plurality of different resin matrixes to obtain a plurality of composite materials with outstanding comprehensive performance; and the fiber provided by the invention has the characteristics of high flexibility, strong controllability and wide application field range.

Description

technical field [0001] The invention relates to a modification technology of organic fibers, in particular to a surface graft modified aramid fiber and a preparation method thereof. Background technique [0002] Aramid fiber refers to a new type of high-tech synthetic fiber that has been industrially produced and widely used. The full name is p-phenylene terephthalamide (PPTA). It is famous for its excellent mechanical properties, thermal stability and chemical stability. Therefore, it is widely used in the fields of aerospace, sporting goods and high-strength ropes. Among the many uses of aramid fibers, more than 30% of the proportion is prepared into resin-based composite materials. [0003] As we all know, the comprehensive performance of composite materials depends on the performance of the resin matrix and the performance of the reinforcement on the one hand, and on the other hand, the interface performance of the two also plays an important role. Aramid fiber has hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/65D06M101/36
Inventor 顾嫒娟张红蕊梁国正袁莉
Owner SUZHOU UNIV
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