Surface modified aramid fiber and preparation method thereof

A technology for surface modification of aramid fiber, applied in the field of surface modification of aramid fiber and its preparation, can solve the problems of unfavorable excellent performance of graphene oxide, coating layer with low content of graphene oxide, inability to obtain anti-ultraviolet performance, etc. , to achieve the effects of highlighting UV resistance, improving surface activity and increasing the coating range

Active Publication Date: 2016-05-25
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, wh

Method used

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

Examples

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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; take 15g of potassium permanganate and slowly add it to the mixture, keep the temperature at 10°C and stir for 2h; Transfer to a 30°C water bath, and keep stirring for 30min. After the reaction, slowly add 230mL o...

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 to 8.5 with 0.5mol / L sodium hydroxide , 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, dilute to the 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 to 8.5 with 0.5mol / L sodium hydroxide , 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...

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Abstract

The invention discloses a surface modified aramid fiber and a preparation method thereof. Clean aramid fiber which is cleaned is dipped into a dopamine solution under a weak basicity condition to obtain a dopamine wrapped aramid fiber; through an esterification reaction and pi-pi interaction between oxidized graphene and the dopamine wrapped aramid fiber, a high-grafting-ratio oxidized graphene layer is formed on the surface of the aramid fiber, so that the surface modified aramid fiber is obtained. The surface modified aramid fiber has excellent ultraviolet resistance and is provided with a lot of active groups, in this way, the surface activity of the aramid fiber is obviously improved, and conditions are provided for further modification and application of the fiber. Meanwhile, in the process of modifying the aramid fiber, it is not needed to pretreat the aramid fiber, the preparation process is environmentally friendly, the operation technology is simple and controllable, and the surface modified aramid fiber is suitable for large-scale industrialized 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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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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