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Method for modifying interior and surface of aramid fiber through isocyanate in supercritical CO2

A kind of aramid fiber and isocyanate technology, which is applied in fiber processing, textile and papermaking, etc., can solve the problems of fiber damage, long reaction time, toxic solvent, etc., and achieve the effect of short reaction time, controllable reaction and simple separation.

Inactive Publication Date: 2014-04-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple to operate, it has disadvantages such as toxic solvent, protective gas, fiber damage, and long reaction time.

Method used

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  • Method for modifying interior and surface of aramid fiber through isocyanate in supercritical CO2
  • Method for modifying interior and surface of aramid fiber through isocyanate in supercritical CO2
  • Method for modifying interior and surface of aramid fiber through isocyanate in supercritical CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The interior and surface of the aramid fiber were exposed to supercritical CO 2 TDI modification in

[0027] (1) Cleaning of aramid fiber surface:

[0028] Put the acetone solution in the three-necked flask, and put the aramid fiber in the Soxhlet extractor. Heat anhydrous acetone to 70°C, clean the surface of the aramid fiber after the acetone is condensed and refluxed, take out the fiber after 24 hours, and dry it in vacuum for later use;

[0029] (2) Aramid fiber in supercritical CO 2 Chain extension bridging and grafting reaction with isocyanate:

[0030] Add a certain amount of TDI to the autoclave, and then put a certain amount of aramid fiber that has been cleaned on the surface into the autoclave (the mass ratio of isocyanate to aramid fiber is 1:1, no contact with TDI); close the autoclave, and remove the air After that, a certain amount of CO was charged into the kettle 2 , heating the system to 90°C, and the pressure reaches 15MPa, making the system in s...

Embodiment 2

[0053] The interior and surface of the aramid fiber were exposed to supercritical CO 2 HDI modification in

[0054] (1) Cleaning of aramid fiber surface:

[0055] Put the acetone solution in the three-necked flask, and put the aramid fiber in the Soxhlet extractor. Heat the acetone to 70°C, clean the surface of the aramid fiber after the acetone is condensed and refluxed, take out the fiber after 24 hours, and dry it in vacuum for later use;

[0056] (2) Aramid fiber in supercritical CO 2 Chain extension bridging and grafting reaction with isocyanate:

[0057] Add a certain amount of HDI to the autoclave, and then put a certain amount of surface-cleaned aramid fiber into the autoclave (the mass ratio of isocyanate to aramid fiber is 1:1, and it does not contact with TDI); close the autoclave and remove the air After that, a certain amount of CO was charged into the kettle 2 , heating the system to 90°C, and the pressure reaches 13MPa, making the system in supercritical CO...

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Abstract

The invention relates to a method for modifying the interior and the surface of an aramid fiber through isocyanate in supercritical CO2. The method comprises the following steps of: (1) cleaning the surface of the aramid fiber with anhydrous acetone and drying under vacuum; (2) placing the isocyanate and the aramid fiber obtained in the step (1) into a reactor, wherein the isocyanate and the aramid fiber are not contacted, closing the reactor, after air is exhausted, filling CO2 into the reactor at room temperature, keeping the system in a supercritical CO2 state, after swelling and reaction are finished, cooling and releasing pressure, and taking out the fiber; and (3) washing the modified aramid fiber with the anhydrous acetone, and drying the fiber under vacuum. The method is economic and environment-friendly, and reaction is controllable; a solvent and a product are simply separated; a chain extension bridging reaction can be effectively performed in a fiber amorphous area by the method; the tensile modulus and the tensile strength of the aramid fiber are improved; an organic functional group can be effectively grafted on the surface through the grafting reaction of the surface; and the aim of modifying the interior and the surface of the fiber at the same time is fulfilled.

Description

technical field [0001] The invention belongs to the field of modification of aramid fibers, in particular to a supercritical CO 2 A method for modifying the interior and surface of aramid fiber with isocyanate. Background technique [0002] Aramid fiber can be roughly divided into meta-aramid (aramid 1313 or aramid Ⅰ), para-aramid (aramid 1414 or aramid Ⅱ) and heterocyclic aramid (aramid Ⅲ). Because aramid fibers have the characteristics of ultra-high modulus, high strength, high temperature resistance, and light weight, they are widely used in aerospace, military clothing, and material reinforcement. Since aramid fiber is formed by rigid molecular chains, it has a unique "skin-core" structure. The rod-like molecules in the core are arranged in parallel through hydrogen bonds, and the rigid molecular chains with high crystallinity are arranged in parallel along the fiber axis in the skin. The thickness is about 1%-40% of the entire fiber diameter. In the rigid molecular c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/395D06M101/36
Inventor 余木火周建军滕翠青马禹韩克清孔海娟张蕊焦玉聪赵玲刘涛严斌尤伟刘振全
Owner DONGHUA UNIV
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