Using supercritical co 2 Method for Organic Modification of Aramid Fiber by Fluid Technology

An aramid fiber and fluid technology technology, which is applied in the field of organic modification of aramid fiber, can solve the problems of large application limitations of the modification method, poor surface coverage stability, and decreased mechanical properties of fibers, so as to improve the resistance to light degradation, The effect of improved resistance to photodegradation and short reaction time

Active Publication Date: 2020-05-29
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the surface layer falls off, photodegradation occurs inside the fiber, forming defects, causing the mechanical properties of the fiber to decline
[0008] Therefore, how to introduce the light stabilizer into the interior of the fiber, especially the amorphous region inside the fiber, overcome the problems of poor surface coverage stability, weak resistance to photolysis, and large application limitations of modification methods brought about by fiber surface modification coverage, and improve The ability of fibers to resist photodegradation without reducing the mechanical properties of fibers is still a technical problem that needs to be further solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Put the Kevlar49 fiber into an acetone solvent, wash it ultrasonically at 80°C for 1h, take it out, and dry it in vacuum at 80°C for 8h.

[0032] (2) Place the washed and dried Kevlar49 fibers and HALS 770 in step (1) in a 2L autoclave, and place the Kevlar49 fibers on a metal frame so that they do not come into contact with the HALS 770.

[0033] (3) Heat the 2L autoclave to 80°C by means of oil bath heating, first vacuumize the autoclave to remove the air, and then fill the autoclave with CO 2 , so that the pressure in the kettle reaches 12Mpa, in supercritical CO 2 State, the quality of hindered amine light stabilizer 770 is 3% of the mass of carbon dioxide added in the reactor; after the swelling reaction for 40 minutes, the pressure in the high-pressure reactor is released to normal pressure for 4 minutes, and the modified Kevlar49 fiber is obtained.

[0034] (4) The modified Kevlar49 fiber was washed with acetone at 80°C for 1h to constant weight, and then va...

Embodiment 2

[0041] (1) Put the Kevlar29 fiber into an acetone solvent, wash it ultrasonically at 80°C for 1h, take it out, and dry it in vacuum at 80°C for 8h.

[0042] (2) Place the washed and dried Kevlar29 fiber and light stabilizer PDS in step (1) in a 2L autoclave, and place the Kevlar29 fiber on a metal frame so that it does not come into contact with the light stabilizer PDS.

[0043] (3) Heat the 2L autoclave to 60°C by means of oil bath heating, first vacuumize the autoclave to remove the air, and then fill the autoclave with CO 2 , so that the pressure in the kettle reaches 15Mpa, in supercritical CO 2 State, the quality of the light stabilizer PDS is 2.5% of the mass of carbon dioxide added to the reactor; after the swelling reaction for 30 minutes, the pressure in the high-pressure reactor is released to normal pressure for 6 minutes, and the modified Kevlar29 fiber is obtained.

[0044] (4) The modified Kevlar29 fiber was washed with acetone at 80°C for 1h to constant weight...

Embodiment 3

[0051] (1) Put the Kevlar149 fiber into an acetone solvent, wash it ultrasonically at 80°C for 1h, take it out, and dry it in vacuum at 80°C for 8h.

[0052] (2) Place the washed and dried Kevlar149 fiber and UV-absorbing light stabilizer UV-326 in step (1) in a 2L high-pressure reactor, and place the Kevlar149 fiber on a metal frame so that it is not stabilized with UV-absorbing light Agent UV-326 exposure.

[0053] (3) Heat the 2L autoclave to 90°C by means of oil bath heating, first vacuumize the autoclave to remove the air, and then fill the autoclave with CO 2 , so that the pressure in the kettle reaches 13Mpa, in supercritical CO 2 State, the mass of ultraviolet absorbing light stabilizer UV-326 is 2.5% of the mass of carbon dioxide added to the reactor; after swelling reaction for 60 minutes, the pressure in the high-pressure reactor is released to normal pressure for 3 minutes, and the modified Kevlar149 fiber is obtained.

[0054] (4) The modified Kevlar149 fiber wa...

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Abstract

The invention relates to a method for organic modification of aramid fibers with a supercritical CO2 fluid technology. According to the method, the modified aramid fibers are obtained through a swelling reaction of the aramid fibers and a supercritical CO2 fluid with a light stabilizer dissolved. Specifically, the aramid fibers and the light stabilizer are placed in a reaction container, and the aramid fibers and the light stabilizer do not contact with each other; CO2 gas is introduced into the reaction container until the supercritical CO2 fluid is produced; the supercritical CO2 fluid carries the dissolved light stabilizer and is subjected to the swelling reaction with the aramid fibers, and the modified aramid fibers are obtained. According to the modification method using the supercritical CO2 fluid, the supercritical CO2 fluid carries the micromolecular light stabilizer to go into the aramid fibers by use of the high permeation and carrying effect, so that the photo-degradation resistance of the aramid fibers is effectively improved, and the mechanical property of the fibers can also be improved.

Description

technical field [0001] The invention belongs to the field of fiber modification and relates to the use of supercritical CO 2 A method for organic modification of aramid fiber by fluid technology. Background technique [0002] Para-aramid fiber, also known as poly p-phenylene-terephthalamide (Poly p-phenylene-terephthalamide) fiber, referred to as PPTA fiber, has excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight. It is widely used in advanced strategic weapons, national defense industry, aerospace, major engineering construction, bulletproof protection of soldiers, automobiles, fiber optic reinforcement, cables and other fields. It is an indispensable important strategic material for national security, economic construction and scientific and technological progress. [0003] The interior of the aramid fiber is composed of highly oriented crystalline regions and amorphous regions, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/355D06M13/352D06M23/10D06M101/36
Inventor 孔海娟余木火张有凤何亮李忠文
Owner SHANGHAI UNIV OF ENG SCI
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