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Method for improving mechanical properties of aramid fiber in supercritical fluid through stretching orientation

A supercritical fluid, aramid fiber technology, applied in fiber processing, fiber types, textiles and papermaking, etc., can solve the problems of aramid modification technology, such as troublesome operation, inability to achieve continuous production, low production efficiency, etc. Simple separation from product, increased crystallinity, and short reaction time

Inactive Publication Date: 2013-12-25
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the aramid fiber modification technology mainly has the disadvantages of troublesome operation, low efficiency, and the inability to realize continuous production, low production efficiency, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for improving the mechanical properties of an aramid fiber by stretching orientation in a supercritical fluid, comprising the following steps:

[0024] (1) Clean the surface of Kevlar29 fiber, specifically put the fiber into toluene solvent, soak and heat to 80°C for 3 hours, take it out and dry it in vacuum.

[0025] (2) At 80°C, put the fiber into the container, the fiber tension is 90cN, first remove the air, and then fill the container with CO 2 , so that the inner space of the airtight container is in supercritical CO 2 After 10 minutes of swelling reaction, the pressure is released slowly to obtain the modified Kevlar29 fiber.

[0026] (3) The modified Kevlar29 fiber was washed with toluene to constant weight and dried. The washing temperature was controlled at 80°C, and the washing time was 50 minutes; the drying temperature was 100°C, and the drying time was 3 minutes.

[0027] (4) The monofilament strength and modulus of the modified Kevlar29 fiber w...

Embodiment 2

[0029] A method for improving the mechanical properties of an aramid fiber by stretching orientation in a supercritical fluid, comprising the following steps:

[0030] (1) Surface cleaning of Kevlar49 fiber, specifically, put the fiber into toluene solvent, soak and heat to 90°C for 2 hours, take it out and dry it in vacuum.

[0031] (2) At 90°C, put the fiber into the container, the fiber tension is 100cN, first remove the air, and then fill the container with CO 2 , so that the inner space of the airtight container is in supercritical CO 2 After 9 minutes of swelling reaction, the pressure is released slowly, and the modified Kevlar49 fiber is obtained.

[0032] (3) The modified Kevlar49 fiber was washed with toluene to constant weight and dried. The washing temperature was controlled at 90°C, and the washing time was 40 minutes; the drying temperature was 110°C, and the drying time was 3 minutes.

[0033] (4) The monofilament strength and modulus of the modified Kevlar49 ...

Embodiment 3

[0035] A method for improving the mechanical properties of an aramid fiber by stretching orientation in a supercritical fluid, comprising the following steps:

[0036] (1) Clean the surface of Kevlar129 fiber, specifically put the fiber into toluene solvent, soak and heat to 80°C for 3 hours, take it out and dry it in vacuum.

[0037] (2) At 100°C, put the fiber into the container, the fiber tension is 90cN, first remove the air, and then fill the container with CO 2 , so that the inner space of the airtight container is in supercritical CO 2 After 10 minutes of swelling reaction, release the pressure slowly to obtain modified Kevlar129 fiber.

[0038](3) The modified Kevlar129 fiber was washed with toluene to constant weight and dried. The washing temperature was controlled at 80°C and the washing time was 50min; the drying temperature was 100°C and the drying time was 3min.

[0039] (4) The monofilament strength and modulus of the modified Kevlar129 fibers are increased by...

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Abstract

The invention relates to a method for improving mechanical properties of an aramid fiber in a supercritical fluid through stretching orientation. A supercritical carbon dioxide fluid is utilized for partially destroying interaction of a PPTA (poly-p-phenylene terephthamide) molecular chain in the aramid fiber under the action of certain tension, and the molecular chain is further oriented, so that the aramid fiber with good properties is obtained. The method for improving the mechanical properties of the aramid fiber in the supercritical fluid through stretching orientation mainly comprises the following steps: ensuring that the aramide fiber maintains certain tension in a closed container, introducing CO2 into the container at a certain temperature, so that the internal space of the closed container is in a supercritical CO2 state, carrying out swelling reaction for a period of time, and slowly releasing pressure, thus the highly stretching-oriented aramid fiber is obtained. The method for improving the mechanical properties of the aramid fiber in the supercritical fluid through stretching orientation guarantees that the aramid fiber is in a stretched state in a reaction process, so that orientation degree and crystallinity of a molecular chain are increased while stretching tension is changed, crystal particles are largened, and crystals are more and more complete.

Description

technical field [0001] The invention belongs to the field of fiber modification, and relates to a method for improving the mechanical properties of aramid fibers by stretching and orientation in a supercritical fluid. Background technique [0002] Supercritical fluid has the advantages of non-toxic and environmental protection, density close to liquid, viscosity close to gas, high diffusion coefficient, large dissolution and penetration capacity, etc., and has important uses in the fields of drug extraction, foaming, and sewage treatment. Polymer modification using supercritical fluid technology is a newly developed method. [0003] Most aramid fibers have the characteristics of ultra-high modulus, high strength, high temperature resistance, and light weight, and are widely used in aerospace, military clothing, and material reinforcement. Aramid fibers are rigid molecular chains with strong interactions between molecules, making stretching and orientation very difficult. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M23/00D06M101/36
Inventor 余木火刘新东孔海娟刘静宋福如钟鸿鹏亢春卯邱大龙沈伟波李双江杜凌栋宋志强叶盛宋利强宋聚强滕翠青韩克清
Owner DONGHUA UNIV
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