A kind of surface modified aramid fiber and preparation method thereof

A technology of aramid fiber and surface modification, which is applied in the field of surface modified aramid fiber and its preparation, which can solve the problems of unfavorable graphene oxide excellent performance, low graphene oxide content coating layer, and inability to prevent ultraviolet rays from penetrating, etc. , to achieve the effects of highlighting UV resistance, improving surface activity and increasing the coating range

Active Publication Date: 2018-04-03
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the carbonyl group (six-membered ring structure) on polydopamine is not prone to Schiff base reaction, resulting in low yield of Schiff base reaction, so the content of graphene oxide grafted on the surface of aramid fiber is low
Secondly, the low content of grafted graphene oxide makes it difficult to form a uniform coating layer with a certain thickness on the surface, which cannot prevent the penetration of ultraviolet rays, thus failing to obtain good anti-ultraviolet properties
Third, the reaction between the carboxyl group on graphene oxide and the amino group on ethylenediamine will generate an amide bond, which will be easily broken under the irradiation of ultraviolet light, which is not conducive to the excellent performance of graphene oxide.

Method used

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  • A kind of surface modified aramid fiber and preparation method thereof
  • A kind of surface modified aramid fiber and preparation method thereof
  • A kind of surface modified aramid fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Cleaning of aramid fiber

[0028] 5g para-aramid fiber (Kevlar-49, diameter 12μm, density 1.43g / cm 3 , produced by DuPont, USA) were placed in 500mL of acetone, petroleum ether and deionized water in sequence, and refluxed for 3 hours; after cleaning, the fibers were taken out and dried in an oven at 80°C for 6 hours to obtain clean aramid fibers, which were denoted as KF. Its infrared spectrograms, scanning electron microscope photos, and transmission electron microscope photos are shown in the attached figure 1 , 2 , 3, see Table 1 for contact angle and surface activity.

[0029] 2. Preparation of graphite oxide

[0030] At 0°C, mix 5g of graphite, 2.5g of sodium nitrate and 115mL of 98% concentrated sulfuric acid in a flask, and stir for 30 minutes; slowly add 15g of potassium permanganate into the mixture, keep the temperature at 10°C and stir for 2h; then The flask was transferred to a 30°C water bath, and kept stirring for 30 min. After the reaction, slowl...

Embodiment 2

[0041] 1. Cleaning of aramid fiber

[0042] 5g para-aramid fiber (Kevlar-49, diameter 12μm, density 1.43g / cm 3 , produced by DuPont, USA) were placed in 500mL of acetone, petroleum ether and deionized water in sequence, and refluxed for 3 hours; after cleaning, the fibers were taken out and dried in an oven at 80°C for 6 hours to obtain clean aramid fibers.

[0043] 2. Preparation of dopamine-coated aramid fibers

[0044] First take 5mL of 1M Tris-HCl solution in a 500mL volumetric flask, dilute to the volume, and prepare a 10mM Tris-HCl solution; then prepare a dopamine solution with a concentration of 3g / L, and adjust the pH of the solution with 0.5mol / L sodium hydroxide to 8.5, to obtain dopamine solution A. Soak 2.5g of the clean aramid fibers obtained in step 1 into dopamine solution A, and shake and react at 25°C for 24h. After the reaction, the fibers were taken out, washed with deionized water, and dried in a vacuum oven at 40° C. for 24 hours. The dopamine-coated ...

Embodiment 3

[0048] 1. Cleaning of aramid fiber

[0049] 5g para-aramid fiber (Kevlar-49, diameter 12μm, density 1.43g / cm 3 , produced by DuPont, USA) were placed in 500mL acetone, petroleum ether and deionized water in turn, and refluxed for 3 hours; after cleaning, the fibers were taken out and dried in an oven at 80°C for 6 hours to obtain clean aramid fibers.

[0050] 2. Preparation of dopamine-coated aramid fibers

[0051] First take 5mL of 1M Tris-HCl solution in a 500mL volumetric flask, set to volume, and prepare a 10mM Tris-HCl solution; then prepare a dopamine solution with a concentration of 4g / L, and adjust the pH of the solution with 0.5mol / L sodium hydroxide to 8.5, to obtain dopamine solution A. Soak 2.5g of the clean aramid fibers obtained in step 1 into dopamine solution A, and shake and react at 25°C for 24h. After the reaction, the fibers were taken out, washed with deionized water, and dried in a vacuum oven at 40° C. for 24 hours. The dopamine-coated aramid fibers ...

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Abstract

The invention discloses a surface-modified aramid fiber and a preparation method thereof. Immerse the cleaned aramid fibers in a dopamine solution under weak alkaline conditions to obtain dopamine-coated aramid fibers; through the esterification reaction and π-π interaction between graphene oxide and dopamine-coated aramid fibers , A graphene oxide layer with a high grafting rate is formed on the surface of the aramid fiber to prepare a surface-modified aramid fiber. It has excellent UV resistance and contains a large number of active groups, which obviously improves the surface activity of aramid fibers and provides conditions for further modification and application of fibers. At the same time, in the process of modifying the aramid fiber, the present invention does not need to pretreat the aramid fiber, the preparation process is green and environmentally friendly, the operation process is simple and controllable, and it is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a surface graft modification technology of organic fibers, in particular to a surface modified aramid fiber and a preparation method thereof. Background technique [0002] Since the discovery of aramid fiber in 1972, aramid fiber has been leading many industries with its excellent comprehensive properties (especially super fatigue resistance, high modulus, high strength, good heat resistance and chemical stability). Cutting-edge developments. However, the lack of active groups on the surface of aramid fiber leads to low surface free energy; meanwhile, its anti-ultraviolet performance is also poor, which greatly limits its application in various fields. Therefore, to obtain aramid fibers with good surface activity and UV resistance has been widely concerned. [0003] The surface modification of aramid fibers mainly includes chemical etching modification, chemical grafting modification, plasma modification and γ-ray radiation m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/74D06M13/328D06M10/06D06M10/08D06M101/36
CPCD06M10/06D06M10/08D06M11/74D06M13/328D06M2101/36D06M2200/25
Inventor 顾嫒娟朱姣姣梁国正袁莉
Owner SUZHOU UNIV
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