Surface modification method for lossless environment-friendly convenient aramid fiber material

A surface modification, aramid fiber technology, applied in the field of aramid material surface modification, can solve the problems of complex equipment, poor modification effect, complicated operation steps, etc., and achieve the effect of adjustable thickness and excellent reactivity

Active Publication Date: 2012-10-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modification methods all sacrifice the mechanical strength of aramid fiber, destroy the surface structure of aramid fiber, the modification

Method used

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  • Surface modification method for lossless environment-friendly convenient aramid fiber material
  • Surface modification method for lossless environment-friendly convenient aramid fiber material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Modification of aromatic fiber powder

[0017] The mass percentage content of each component: Measure 200 ml of Tris-HCl buffer (pH=9.0) and place it in a 500 ml flask, add 6.0 g of aramid fiber powder, and add 0.4 g of dopamine hydrochloride powder, open Magnetic stirrer, react in air for 5 h. Put the reacted suspension into a centrifuge tube, centrifuge in a TGL-16G high-speed centrifuge, remove the lower solid powder, rinse with distilled water, centrifuge again, and repeat the centrifuge and rinse with distilled water until the centrifuge supernatant is colorless, and finally The obtained lower modified aromatic fiber powder is put into an oven and dried at 40 °C to obtain modified 5h aromatic fiber powder. The same method can obtain modified 24h aromatic fiber powder. The TEM picture of the modified 5h aromatic fiber powder obtained is as follows figure 2 。

Embodiment 2

[0019] Aramid long fiber Modification of

[0020] Measure 200 ml of Tris-HCl buffer solution (pH=7.4) into a 500 ml beaker, and add 0.4 g of dopamine hydrochloride powder to prepare a solution. After placing the aramid filament in the above solution for 3 minutes, take it out and let the air flow down and react for 2 minutes. After repeating this process 6 times, the obtained modified aramid long fibers are washed with distilled water, and then placed in an oven to be dried at 40 °C to obtain modified aramid long fibers. The TEM picture of the product is as figure 1 .

Embodiment 3

[0021] Example 3 Modification of Aramid Chopped Fiber

[0022] Measure 400 ml of Tris-HCl buffer (pH=10.8) and place it in a round bottom flask, add 6.0 g of aramid chopped fiber, and 0.8 g of dopamine hydrochloride powder, turn on the magnetic stirrer, and react for 24 hours. The modified aramid chopped fiber was taken out, washed with distilled water, and dried in an oven at 40 °C to obtain the modified aramid chopped fiber.

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Abstract

The invention relates to a surface modification method for a lossless environment-friendly convenient aramid fiber material. The surface modification method comprises the following steps of: taking and placing a Tris-HCl buffer solution with the Ph of 0.7-10.8 in a flask, adding the aramid fiber material into the buffer solution for fully steeping, adding a dopamine hydrochloride modifying agent to the flask, reacting in an open environment under the magnetic stirring condition, and enabling the self-polymerization of the modifying agent to occur; washing and drying the reacted aramid fiber material to obtain the aramid fiber material with modified surface; and continuously steeping the modified aramid fiber material in the dopamine hydrochloride modifying agent solution to enable the self-polymerization of the aramid fiber material to occur, thereby obtaining the modified aramid fiber material with the activated surface and adjustable thickness. The aramid fiber material is a poly-p-phenylene terephthamide or polyisophthaloyl metaphenylene diamine long fiber, chopped fiber or powder. The concentration of the dopamine hydrochloride in the buffer solution is 0.05-2.0mg/ml. A poly-dopamine layer rich in catechol groups is formed on the surface of the modified aramid fiber material obtained by the method; and the modified aramid fiber material has excellent reaction activity and is adjustable in thickness.

Description

technical field [0001] The invention relates to a method for modifying the surface of an aramid fiber material, in particular to a method for modifying the surface of an aramid fiber and its powder with no damage, no pollution and adjustable thickness of the surface modification layer. Background technique [0002] Aramid is a synthetic material with high strength, high modulus, low density and excellent abrasion resistance, including long fibers, short fibers, powders, etc. Its full name is aromatic polyamide. In 1974, the United States Federation of Trade (U.S, Federal Trade Commission, FTC) named them "aramid fibers", and our country called them aramid fibers. In the aramid material, the amide bond is connected with the benzene ring. The unique chemical structure makes it have excellent comprehensive properties and unparalleled advantages of other materials. It has important developments in the fields of physics, chemistry and materials science. prospect. For example: ...

Claims

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Application Information

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IPC IPC(8): D06M15/61C08G73/02D06M101/36
Inventor 董丽杰司帅孟雅娟万杰李琦熊传溪徐浩
Owner WUHAN UNIV OF TECH
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