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A kind of meta-aramid fiber and its preparation method

An aromatic polyamide and fiber technology, which is applied in the field of low thermal shrinkage meta-aramid fibers and their preparation, can solve problems such as undiscovered meta-aramid fibers, and achieves improved dimensional stability performance and reduced Thermal shrinkage, effect of suppressing side reactions

Active Publication Date: 2021-08-31
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No method has been found for the preparation of low shrinkage meta-aramid fibers

Method used

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  • A kind of meta-aramid fiber and its preparation method
  • A kind of meta-aramid fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] like figure 1 , A method for preparing a low heat shrinkage rate interconnection aromatic polyamide fiber in the present invention, including the following steps:

[0030] (1) Under the low temperature and nitrogen protection system, the aminenediamine, the amine dimethyl chloride, and the amide solvent are continuously mixed in the mixer, and then the mixture is cooled by the heat exchanger, and the reaction is reacted at a low temperature. Entering the screw reactor further lifts the molecular weight of the interconnection aromatic polyamide, which is neutralized to obtain a spinning stock solution.

[0031] The low temperature system is preferably -10 to -20 ° C in this step. When the temperature is high, the reaction activity is large, and there is a larger reaction heat, and the side reaction is easily occurring, and a small molecule substance is generated. When the temperature is too low, the required energy consumption is large, and then continues to reduce the tempe...

Embodiment 1

[0053] Preparation of para-aramid fibers between a low heat shrinkage of the embodiment according to the present embodiment, comprising the steps of:

[0054] (1) at low temperature (-10 deg.] C) and nitrogen protection system, the consecutive m-phenylenediamine, isophthaloyl dichloride in N, N- uniformly mixed in dimethylformamide, and then the mixture is passed through a heat exchanger to cool (cooling medium temperature of -10 deg.] C), the reaction at a low temperature, and then into the screw reactor to further enhance the molecular weight of meta-aramid, the residence time 0.8H, an inherent viscosity of 2.7. And after obtaining a spinning dope.

[0055] (2) The resultant dope is filtered to remove solid impurities and gel particles. After the number of metered through metering pump 500 and a pore diameter hole spinneret is 1.2mm, and pre-stretched in the air, an air layer height of 15mm, the draw ratio of 2.8.

[0056] (3) pre-stretched spun fibers sequentially through a coa...

Embodiment 2

[0058] Preparation of para-aramid fibers between a low heat shrinkage of the embodiment according to the present embodiment, comprising the steps of:

[0059] (1) at low temperature (-15 deg.] C) and nitrogen protection system, the consecutive m-phenylenediamine, isophthaloyl dichloride in N, N- uniformly mixed in dimethylformamide, and then the mixture is passed through a heat exchanger to cool (cooling medium temperature of -15 deg.] C), the reaction at a low temperature, and then into the screw reactor to further enhance the molecular weight of meta-aramid, the residence time 1.0H, an inherent viscosity of 2.9. And after obtaining a spinning dope.

[0060] (2) The resultant dope is filtered to remove solid impurities and gel particles. After the number of metered through metering pump 500 and a pore diameter hole spinneret is 1.2mm, and pre-stretched in the air, an air layer height is 20mm, the draw ratio of 2.8.

[0061] (3) pre-stretched spun fibers sequentially through a coa...

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Abstract

The invention discloses a meta-aromatic polyamide fiber and a preparation method thereof, which includes: uniformly mixing m-phenylenediamine and isophthaloyl chloride in a solvent at -10~-20°C and under the protection of inert gas, The mixture is then cooled down through a heat exchanger, and then introduced into a screw reactor to continue the reaction to increase the molecular weight. The reaction liquid is neutralized to obtain the spinning stock solution; the spinning stock solution is filtered, passed through the spinneret, and in the air Pre-stretching is performed to obtain virgin fibers; the virgin fibers are subjected to coagulation bath, hot water bath, heat treatment, heat setting and subsequent treatment to obtain meta-aromatic polyamide fibers. The fiber meta-aromatic polyamide fiber obtained by the invention has a heat shrinkage rate of ≤1.2 at 300°C×15min, a strength of ≥5.5cN / dtex, and a modulus of ≥115cN / dtex. It has good dimensional stability at high temperatures and high strength and modulus.

Description

Technical field [0001] The invention belongs to the field of special fiber preparation, and in particular relates to a low thermal shrinkage meta-aromatic polyamide fiber and a preparation method thereof. Background technique [0002] Due to its special molecular structure, meta-aromatic polyamide fiber has excellent heat resistance, chemical corrosion resistance, excellent insulation and flame retardant properties. It is widely used in high-temperature filtration, insulation, rail transportation, aerospace, national defense and military construction and other fields. [0003] Fiber thermal shrinkage is one of the main parameters that characterizes the fiber structure and properties. It is related to the molecular structure, fiber molding process, etc. It is an indicator that reflects the thermal stability of the fiber. Its size has an important impact on the dimensional stability of the manufactured products. . [0004] Chinese patent CN201410848667.7 provides a colored s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/60C08G69/32C08G69/28D01D5/06D01D5/14D01D10/02
CPCC08G69/28C08G69/32D01D5/06D01D5/14D01D10/02D01F6/605
Inventor 杨军曹凯凯杨佑张志军宋志成袁锋李忠良刘含茂
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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