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Smooth surface type meta-aramid filament and preparation method thereof

A smooth surface, aramid fiber technology, applied in the direction of filament/thread forming, rayon heat treatment, single-component polyamide rayon, etc. No obvious improvement, lack of surface smoothness, etc., to achieve the effect of improving spinning efficiency, improving product gloss and smoothness, and reducing the generation of wool

Pending Publication Date: 2021-11-16
YANTAI TAYHO ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And some sewing threads for special industrial purposes require high smoothness, but the surface smoothness of short fibers is lacking after spinning, which is far less smooth than that of filament fibers.
[0004] Patent application CN101379231B relates to a kind of meta-position wholly aromatic polyamide fiber, especially relates to a kind of meta-position wholly aromatic polyamide fiber with excellent high-temperature processability and a method of manufacturing fiber by wet spinning. A new type of meta-aramid fiber and a manufacturing method that can suppress the generation of harmful gases or organic gases while being colored; patent application CN100422401C relates to a colored meta-aramid short fiber and its wet spinning preparation method, especially After a meta-aromatic spinning stock solution is wet-spun, meta-aramid short fibers with more ideal color and better physical and mechanical properties can be obtained; patent application CN201610883366.7 relates to a dry-wet method for preparing meta-aramid The method of aramid filament, the method mainly involves hot drawing in hot water, and oil immersion treatment after drawing, which can realize the improvement of spinning speed in large-scale production, but this patent application is for meta-aramid The performance improvement of rayon filament is not obvious

Method used

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  • Smooth surface type meta-aramid filament and preparation method thereof
  • Smooth surface type meta-aramid filament and preparation method thereof
  • Smooth surface type meta-aramid filament and preparation method thereof

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preparation example Construction

[0032] A smooth-surfaced meta-aramid filament and a preparation method thereof, the steps of which are:

[0033] (1) Synthesizing a meta-aromatic polyamide compound solution with m-phenylene isophthalamide as a repeating unit earlier to obtain a meta-aramid fiber spinning stock solution;

[0034] Wherein, the meta-aromatic polyamide compound solution with m-phenylene isophthalamide as the repeating unit is subjected to a low-temperature polycondensation reaction at an equimolar ratio of m-phenylene diamine and isophthaloyl chloride. Preferably, the reaction The temperature is -12°C to 0°C, and the viscosity range of the meso-aramid spinning stock solution is 300-1500Po.

[0035] (2) The above-mentioned stock solution is transported into a high-precision filter through a gear pump, and the filtered stock solution is transported to the spinneret assembly by a metering pump, and enters the air gap layer through the spinneret holes on the spinneret assembly to form;

[0036] Amon...

Embodiment 1

[0053] The synthetic isophthaloyl dichloride m-phenylenediamine spinning stock solution with a viscosity of 300Po is filtered through a 30-micron precision filter and then sent into a metering pump. The output flow of each metering pump is 15ml / min. The silk hole then enters the 3mm air gap, and passes through the coagulation bath with the temperature of -5°C and the concentration of N,N-dimethylacetamide of 10% and the temperature of 0°C and the concentration of N,N-dimethylacetamide of 15%. Stretch bath liquid, adjust the rotational speed ratio of the press roller before and after the stretching bath and set the stretching ratio as 1.2 times. The stretched filaments are washed in cold water in a cold water bath with a temperature of 10°C and a concentration of N,N-dimethylacetamide of 2% in sequence, and in a hot water bath with a temperature of 50°C for hot water washing, and the direction of water flow is consistent with the direction of filament advancement. on the contra...

Embodiment 2

[0056] The synthetic isophthaloyl dichloride m-phenylenediamine spinning stock solution with a viscosity of 1500Po is filtered through a 30-micron precision filter and then sent into the metering pump. The silk hole then enters the 10mm air gap, passes through a coagulation bath with a temperature of 38°C and a concentration of N,N-dimethylacetamide of 60% and a stretching bath with a temperature of 38°C and a concentration of N,N-dimethylacetamide of 58% Bath liquid, adjust the rotational speed ratio of the press rollers before and after the stretching bath and set the stretching ratio to 4.9 times. The stretched filaments are washed in cold water in an aqueous solution with a temperature of 20°C and a concentration of N,N-dimethylacetamide of 30%, followed by hot water washing in a hot water bath with a temperature of 80°C, and the direction of water flow is consistent with the direction of filament advancement on the contrary. After washing, the filaments are dried in a dr...

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Abstract

The invention discloses a smooth surface type meta-aramid filament and a preparation method thereof, and particularly relates to a method for preparing smooth surface type meta-aramid by adopting dry-wet spinning (also known as dry spraying-wet spinning). The method mainly comprises the steps of spinning solution preparation, spinning forming, solidification, stretching, cold and hot water washing, drying, oil immersion, semi-finished product winding, semi-finished product wet and hot relaxation, hot drafting, heat setting, final finished product winding and the like. Compared with a wet spinning technology, the dry-wet method for preparing the meta-aramid filament can greatly improve the spinning speed; and compared with short filament fibers, the meta-aramid filament prepared by the method has the advantages that few broken filaments fall off, the glossiness and the smoothness are improved, and the meta-aramid filament can be widely applied to medical sterile environments, aerospace protection and industrial fields with special requirements.

Description

technical field [0001] The invention belongs to the technical field of meta-aramid fibers, and in particular relates to a smooth-surfaced meta-aramid fiber filament and a preparation method thereof. Background technique [0002] Meta-aramid is one of the most widely used high-performance fibers. It has excellent high temperature resistance, flame retardancy, mechanical properties, electrical insulation and good textile processability. It is used in aerospace, national defense, communications, power electronics It is used as the main component of protective clothing, high temperature filter materials, composite materials, insulation materials and other products. [0003] According to the application, meta-aramid is divided into meta-aramid staple fiber and meta-aramid filament. Among them, meta-aramid filament not only has the characteristics of meta-aramid staple fiber, but also has better appearance, color, luster, Mechanical properties and blending properties with other f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/60C08G69/32D01D5/00D01D10/02D01D13/02
CPCD01F6/605C08G69/32D01D5/00D01D13/02D01D10/02
Inventor 高东周军志关振虹宋西全冷向阳葛立
Owner YANTAI TAYHO ADVANCED MATERIALS CO LTD
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