Method modifying aramid fibers in supercritical carbon dioxide environment to increase mechanical performance and surface performance

A carbon dioxide, modified aramid fiber technology, applied in fiber processing, fiber types, textiles and papermaking, etc., can solve the problems of low lateral strength of aramid fiber skin-core structure, achieve improved mechanical properties, larger grain size, Crystallized perfect effect

Active Publication Date: 2020-02-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the existing methods can well solve the problem of low transverse strength caused by the aramid fiber sheath-core structure, which is a technical problem that still needs to be solved

Method used

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  • Method modifying aramid fibers in supercritical carbon dioxide environment to increase mechanical performance and surface performance
  • Method modifying aramid fibers in supercritical carbon dioxide environment to increase mechanical performance and surface performance

Examples

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Embodiment 1

[0024] The present embodiment provides a method for modifying aramid fibers in a supercritical carbon dioxide environment to improve mechanical properties and surface properties, the method comprising the following steps:

[0025] (1) Surface cleaning of F12 fiber: put the F12 fiber to be cleaned in a Soxhlet extractor for extraction and cleaning, the cleaning solution is acetone, the cleaning temperature is 75°C, and the cleaning time is 24h; then in a constant temperature blast drying oven at 40°C Dry at constant temperature for 4h.

[0026] (2) Put the washed F12 fiber and the reaction reagent 1,4-dichlorobutane into the reactor, the mass ratio of the two is 1:70, do not touch each other, and keep the F12 fiber at 12N tension.

[0027] (3) Close the reaction kettle, cool it down to 13.9°C in an ice-water bath, pass in carbon dioxide to exhaust the air in the kettle, and continue to inflate until the pressure remains constant.

[0028] (4) Heating in an oil bath, raising th...

Embodiment 2

[0032]The present embodiment provides a method for modifying aramid fibers in a supercritical carbon dioxide environment to improve mechanical properties and surface properties, the method comprising the following steps:

[0033] (1) Surface cleaning of F12 fiber: put the F12 fiber to be cleaned in a Soxhlet extractor for extraction and cleaning, the cleaning solution is acetone, the cleaning temperature is 75°C, and the cleaning time is 24h; then in a constant temperature blast drying oven at 40°C Dry at constant temperature for 4h.

[0034] (2) Put the washed F12 fiber and the reaction reagent 1,4-dichlorobutane into the reactor, the mass ratio of the two is 1:60, and they are not in contact with each other, and the F12 fiber is kept at 6N tension.

[0035] (3) Close the reaction kettle, cool down to 13.0°C in an ice-water bath, pass in carbon dioxide to exhaust the air in the kettle, and continue to inflate until the pressure remains constant.

[0036] (4) Heating in an oi...

Embodiment 3

[0040] The present embodiment provides a method for modifying aramid fibers in a supercritical carbon dioxide environment to improve mechanical properties and surface properties, the method comprising the following steps:

[0041] (1) Surface cleaning of Kevlar 49 fibers: put the Kevlar 49 fibers to be cleaned in a Soxhlet extractor for extraction and cleaning, the cleaning solution is acetone, the cleaning temperature is 75°C, and the cleaning time is 24 hours; Dry at 40°C for 4 hours.

[0042] (2) Put the washed Kevlar 49 fiber and the reaction reagent 1,2-dichloroethane into the reaction kettle, the mass ratio of the two is 1:60, and they are not in contact with each other.

[0043] (3) Close the reaction kettle, cool down to 15.0°C in an ice-water bath, pass in carbon dioxide to exhaust the air in the kettle, and continue to inflate until the pressure remains constant.

[0044] (4) Heating in an oil bath, increasing the temperature and pressure to 80.0°C and 12.0Mpa, main...

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Abstract

The invention discloses a method modifying aramid fibers in a supercritical carbon dioxide environment to increase mechanical performance and surface performance. The method includes the steps of firstly, washing and drying the aramid fibers; secondly, loading the aramid fibers and a reagent into a sealed container, and allowing the aramid fibers to keep tension and not to contact with the reagent; thirdly, feeding carbon dioxide, and heating to rise temperature and pressure to allow the interior of the sealed container to be in a supercritical carbon dioxide state; fourthly, after the swelling reaction, slowly relieving pressure in a constant-speed manner to obtain the modified aramid fibers; fifthly, washing and drying the modified aramid fibers. The method has the advantages surface activation and longitudinal tensile strength increasing of the aramid fibers are achieved, fiber skin layer and core layer combination is reinforced through the crosslinking reaction among molecular chains inside the fibers, the skin-core structure is improved, fiber transverse strength is increased, and the method is of important significance to the modification and use efficiency increasing of thearamid fibers.

Description

technical field [0001] The invention relates to a method for modifying aramid fibers, in particular to a method for modifying aramid fibers in a supercritical carbon dioxide environment to improve mechanical properties and surface properties. Background technique [0002] Aramid fiber, full name aromatic polyamide fiber, referred to as aramid fiber. The rigid crystalline structure of aramid fiber makes it excellent in mechanical properties, with high tensile strength, high modulus and excellent heat resistance. Aramid fiber reinforced epoxy resin composites are ideal missile and aircraft engine shell materials. Aramid fibers are widely used in many fields such as national defense, aerospace, automobiles, and cables. [0003] However, due to the inherent "skin-core" structure of aramid fiber, it has the characteristics of a high proportion of aromatic rings in the molecular segment, large steric hindrance, and weak inter-molecular chain force, and the bonding force between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M23/10D06M13/08D06M101/36
CPCD06M23/105D06M13/08D06M2101/36
Inventor 刘丽马震宇贾储源苑成策董继东杜韫哲黄玉东
Owner HARBIN INST OF TECH
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