Inorganic modification method adopting supercritical CO2 fluid technique for aramid fibers

A kind of aramid fiber and fluid technology technology, applied in the field of inorganic modification of aramid fiber, can solve the problems of large application limitations of the modification method, poor surface coverage stability, reduced mechanical properties of fibers, etc., to improve the resistance to light degradation, The effect of improving the resistance to photodegradation and improving the mechanical properties

Active Publication Date: 2017-11-24
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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

[0032] (1) Put 5g of Kevlar49 fiber into acetone solvent, ultrasonically wash at 80°C for 1h, take it out, and dry it in vacuum at 80°C for 2h.

[0033] (2) The washed and dried Kevlar49 fiber and 2g of n-butyl titanate in step (1) were placed in a 2L autoclave, and the Kevlar49 fiber was placed on a metal frame so that it would not contact with n-butyl titanate.

[0034] (3) Heat the 2L autoclave to 100°C by means of oil bath heating, first vacuumize the autoclave to remove the air and water, and after the temperature in the autoclave drops to 80°C, fill the autoclave with CO 2 , so that the pressure in the kettle reaches 10Mpa, in supercritical CO 2State, the mass of n-butyl titanate is 3% of the mass of carbon dioxide in the reactor; after the swelling reaction for 40 minutes, the pressure in the reactor is released to normal pressure for 3 minutes, and Kevlar49 fibers containing 0.17g of n-butyl titanate are obtained.

[0035] (4) Kevlar49 fibers containing 0.17g of n-but...

Embodiment 2

[0043] (1) Put 5.5g of Kevlar29 fibers into an acetone solvent, ultrasonically wash them at 80°C for 1 hour, take them out, and dry them under vacuum at 80°C for 2 hours.

[0044] (2) Place the washed and dried Kevlar29 fiber and 2.5g of titanium tetrachloride in a 2L autoclave in step (1), and place the Kevlar29 fiber on a metal frame so that it does not contact with titanium tetrachloride.

[0045] (3) Heat the 2L autoclave to 100°C by means of oil bath heating, first vacuum the air and water in the autoclave, and after the temperature in the autoclave drops to 80°C, fill the autoclave with CO 2 , so that the pressure in the kettle reaches 10Mpa, in supercritical CO 2 state, the quality of titanium tetrachloride is 2.5% of the mass of carbon dioxide in the reactor; after swelling for 40 minutes, the pressure in the reactor is released to normal pressure for 5 minutes to obtain Kevlar29 fibers containing 0.1 g of titanium tetrachloride.

[0046] (4) Kevlar29 fibers containin...

Embodiment 3

[0054] (1) Put 6g of Tecnora fiber into acetone solvent, ultrasonically wash at 80°C for 1h, take it out, and dry it in vacuum at 80°C for 2h.

[0055] (2) Place the Tecnora fiber and 1.2g of titanium tetrachloride through washing and drying in step (1) in a 2L autoclave, and place the Tecnora fiber on a metal frame so that it does not contact with titanium tetrachloride.

[0056] (3) Heat the 2L autoclave to 100°C by means of oil bath heating, first vacuumize the autoclave to remove the air and water, and after the temperature in the autoclave drops to 70°C, fill the autoclave with CO 2 , so that the pressure in the kettle reaches 13Mpa, in supercritical CO 2 state, the quality of titanium tetrachloride is 3.5% of the mass of carbon dioxide in the reactor; after swelling for 60 minutes, the pressure in the reactor is released to normal pressure for 3 minutes to obtain Tecnora fibers containing 0.2 g of titanium tetrachloride.

[0057] (4) Tecnora fibers containing 0.2 g of t...

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Abstract

The invention relates to an inorganic modification method adopting a supercritical CO2 fluid technique for aramid fibers. The method comprises the following steps: 1) aramid fibers containing an inorganic light stabilizer precursor are prepared from aramid fibers and a supercritical CO2 fluid with the inorganic light stabilizer precursor dissolved through a swelling reaction; 2) the aramid fibers containing the inorganic light stabilizer precursor are added to an alcohol solvent containing a basic solute or an acidic solute, the mixture is subjected to thermal decomposition, and modified aramid fibers containing an inorganic light stabilizer are formed. The supercritical CO2 fluid with strong penetration and carrying effects carries the small-molecular light stabilizer precursor into amorphous regions on the surfaces of the aramid fibers and inside the aramid fibers, on one hand, the mechanical properties of the fibers are improved by means of plastication of supercritical CO2, on the other hand, the structure of the nanometer light stabilizer in the amorphous regions can be controlled, agglomeration is avoided, and the photodegradation resistance of the fibers is improved.

Description

technical field [0001] The invention belongs to the field of fiber modification, in particular to the use of supercritical CO 2 A method for inorganic modification of aramid fiber by fluid technology. Background technique [0002] Aramid fiber refers to a high-performance fiber with aromatic rigid chains containing more than 85% benzene rings. It has excellent properties such as high strength, high modulus, high temperature resistance, chemical solvent resistance, and small specific gravity. It is widely used in advanced strategic weapons, such as, It is an important strategic material in the fields of aerospace engines, bulletproof protective devices for soldiers, aerospace, automobiles, optical fiber enhancements, and cables. [0003] The interior of the aramid fiber is composed of highly oriented crystalline regions and amorphous regions, and the amorphous region is partially composed of microfibers and micropores. Fiber breakage generally occurs first in the amorphous r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/46D06M11/44D06M101/36
CPCD06M11/44D06M11/46D06M2101/36
Inventor 孔海娟张新异张有凤孙卉丁海泉
Owner SHANGHAI UNIV OF ENG SCI
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