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Thermotropic liquid crystal polyarylater monofilament heat treatment device and heat treatment method

A technology of heat treatment device and heat treatment method, which is applied in the direction of heat treatment of rayon filaments, textile and papermaking, and complete sets of equipment for producing man-made threads, etc. Stability and other issues, to achieve the effect of low processing cost, perfect crystallization, improved strength and modulus

Active Publication Date: 2015-07-01
WUXI JINTONG CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent application of CN101748534 A reports a chemical fiber heat treatment machine and treatment method, which processes fibers in an open environment, but only achieves the purpose of reducing the dry heat shrinkage of fibers, and cannot improve the strength and modulus of fibers
Moreover, the open processing environment makes the fibers heated unevenly, and the lack of vacuum atmosphere is not conducive to the stability of the fiber structure and is prone to oxidation.
In addition, in the industry, the online continuous nitrogen filling method is often used for fiber heat treatment. Although oxidation can be avoided, the equipment investment is large, the cost is high, and there is also the problem of high fiber unevenness.

Method used

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  • Thermotropic liquid crystal polyarylater monofilament heat treatment device and heat treatment method

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Experimental program
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Effect test

Embodiment 1

[0031] The strength of the thermotropic liquid crystal polyarylate monofilament is 12.1cN / detx. The heat treatment process is that the temperature of the box and the tension roller is 270°C, the circulating wind speed is 0.5m / s, the vacuum degree is 76mm Hg, and the unwinding roller The speed is 0.01m / min, the winding roller speed is 0.02m / min, the tension roller tension is 0.1MPa, and the heat treatment time is 18h. After heat treatment, the strength of the thermotropic liquid crystal polyarylate fiber increases to 16.8cN / detx, the elongation at break is 2.4%, the strength unevenness is 0.9%, and the elongation unevenness is 1.2%.

Embodiment 2

[0033] The strength of the thermotropic liquid crystal polyarylate monofilament is 12.1cN / detx, the heat treatment process is that the temperature of the box body and the tension roller is 280°C, the circulating wind speed is 0.3m / s, the vacuum degree is 76mm Hg, and the unwinding roller The speed is 0.01m / min, the winding roller speed is 0.05m / min, the tension roller tension is 0.1MPa, and the heat treatment time is 20h. After heat treatment, the strength of the thermotropic liquid crystal polyarylate fiber increases to 18.1cN / detx, the elongation at break is 1.8%, the strength unevenness is 0.9%, and the elongation unevenness is 1.1%.

Embodiment 3

[0035] The strength of the thermotropic liquid crystal polyarylate monofilament is 13.9cN / detx. The heat treatment process is that the temperature of the box and the tension roller is 280°C, the circulating wind speed is 0.8m / s, the vacuum degree is 76mm Hg, and the unwinding roller The speed is 0.1m / min, the winding roller speed is 0.2m / min, the tension roller tension is 0.4MPa, and the heat treatment time is 28h. After heat treatment, the strength of the thermotropic liquid crystal polyarylate fiber increases to 20.6cN / detx, the elongation at break is 3.1%, the strength unevenness is 0.8%, and the elongation unevenness is 0.6%.

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Abstract

The invention provides a thermotropic liquid crystal polyarylater monofilament heat treatment device and a heat treatment method thereof. The heat treatment device is a heated vacuum airtight box body, and a pay-off roller, a heating tension roller and a take-up roller are sequentially arranged in the box body. A heating device and a vacuum suction device are respectively arranged outside the box body. A monofilament is fed into the heated vacuum heat treatment device to perform heat treatment. The thermotropic liquid crystal polyarylater monofilament is heated and drafted in the closed box body, oxidative degradation of the monofilament is avoided, strength unevenness and drawing irregularity of the monofilament are reduced, and the strength and modulus of the monofilament are improved. The heat treatment method is simple in operation and easy to implement, and the problems of existing complicated polyester fiber heat treatment steps and fiber oxidation degradation are solved.

Description

technical field [0001] The invention belongs to the technical field of thermotropic liquid crystal polyarylate fibers, and relates to a thermotropic liquid crystal polyarylate monofilament heat treatment device and a heat treatment method. Background technique [0002] Thermotropic liquid crystal polyarylate fibers have a series of advantages such as high strength and high modulus, chemical corrosion resistance, low water absorption, good dimensional stability, etc., and can be widely used in the fields of automobiles, cable protection, military industry and human body protection. The development and application of thermotropic liquid crystal polyarylate fiber is of great significance to the rapid development of national and national defense construction. [0003] Thermotropic liquid crystal polyarylate chips can be melt-spun to obtain thermotropic liquid crystal polyarylate monofilaments. However, limited by the molecular weight of the slices, the properties such as the st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D10/02D01D13/02
CPCD01D10/02D01D13/02
Inventor 钱琦渊
Owner WUXI JINTONG CHEM FIBER
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