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High-strength and high-toughness para-aramid fibers and preparation method thereof

A technology of para-aramid fiber and manufacturing method, applied in dry spinning method, wet spinning method, rayon cleaning/drying and other directions, can solve the problem that aramid fiber cannot achieve high strength and high elongation at break at the same time , to maintain production stability, high degree of orientation, and improve fiber elongation at break

Active Publication Date: 2021-01-29
中蓝晨光化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to solve the problem that Chinese-made para-aramid fibers cannot simultaneously achieve high strength and high elongation at break in the prior art, and provides a high-strength and high-toughness para-aramid fiber and a manufacturing method thereof. Para-aramid fiber can meet the higher-level weight reduction requirements of bulletproof vests and bulletproof armor, filling the gap in China

Method used

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  • High-strength and high-toughness para-aramid fibers and preparation method thereof
  • High-strength and high-toughness para-aramid fibers and preparation method thereof
  • High-strength and high-toughness para-aramid fibers and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Dissolve the para-aramid polymer resin with an inherent viscosity of 6.3dl / g in 100% concentrated sulfuric acid to make a spinning slurry with a solid content of 19.3%, which is then defoamed, filtered, and sent to the spinning The silk metering pump is used to transport the filaments to the spinneret through metering, and the filaments are spun into the air layer, and then enter the coagulation bath to form primary fibers. The primary fibers are washed, dried, oiled, and wound in sequence to make finished products. Among them, the temperature of the slurry in the defoaming, filtering, and conveying sections is 82°C, the temperature of the slurry in the section from the spinning metering pump to the spinneret is 75°C, the temperature of the coagulation bath is 5°C, and the washing and drying tension is 0.5g / d. The fineness is 1.5D.

Embodiment 2

[0032] This series of examples verifies the influence of the temperature conditions of the slurry in the defoaming, filtering, and conveying sections.

Embodiment 2-1

[0034] The difference between this embodiment and embodiment 1 is that the temperature of the slurry in the defoaming, filtering and conveying sections is 80°C.

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Abstract

The invention discloses high-strength and high-toughness para-aramid fibers and a preparation method thereof. The high-strength and high-toughness para-aramid fibers have the breaking elongation of 4.0-4.7% and the breaking strength of greater than or equal to 3.3 GPa. The preparation method comprises the steps that a para-aramid spinning solution enters an air layer through a spinneret plate andthen enters a coagulating bath to form nascent fibers, and the nascent fibers are sequentially washed, dried, oiled and wound to prepare the finished high-strength and high-toughness para-aramid fibers, wherein the temperature of the spinneret plate passed by the spinning solution is 70-79 DEG C, the temperature of the coagulating bath is 0-20 DEG C, and low-tension control is adopted for washingand drying. The para-aramid fibers prepared by the method have the characteristics of high strength and high toughness, can meet the higher-level weight reduction requirements of bulletproof vests andbulletproof armors, and fill up the domestic blank.

Description

technical field [0001] The invention belongs to the technical field of man-made fibers, and in particular relates to a high-strength and high-toughness para-aramid fiber and a manufacturing method thereof. Background technique [0002] Para-aramid fiber (poly-paraphenylene terephthalamide fiber, also known as aramid 1414 or aramid II) is a kind of high-strength, high-modulus fiber that was first developed by DuPont in the United States in the 1960s. It is a high-performance synthetic fiber with properties such as weight and high temperature resistance. It was industrialized in 1972 and its trade name is Kevlar. ® . After decades of development, DuPont has developed Kevlar ® 29. Kevlar ® 49. Kevlar ® 119. Kevlar ® 129. Kevlar ® AP, Kevlar ® KM2 and other grades, among which Kevlar ® 29. Kevlar ® 129. Kevlar ® KM2 is the anti-ballistic para-aramid product. Table 1 lists the mechanical and anti-ballistic properties of these grades. Among them, the anti-ballis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/04D01D5/06D01D10/06D01D1/09
CPCD01D5/04D01D5/06D01D1/09D01D10/06
Inventor 李兰英林志娇林勇周万立何鑫业
Owner 中蓝晨光化工有限公司
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