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Method for preparing colored meta-aramid

An aramid fiber and non-ferrous technology is applied in the field of preparation of colored meta-aramid fibers, which can solve the problems of difficult cleaning of spinning pipes, complicated fiber color process, waste of slurry, etc., and achieves the effects of easy cleaning, convenient replacement and pigment saving.

Active Publication Date: 2015-07-01
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coloring slurry will cause the spinning pipe to be colored, which will lead to complex processes when changing the fiber color, difficult cleaning of the spinning pipe, and serious waste of slurry, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The blue nano-scale inorganic composite pigment is ground by a ball mill and dispersed in water, and assisted by ultrasonic vibration, so that the average size of the pigment dispersion is about 100nm, and added to water to make a dispersion liquid containing 0.2% pigment as a dyeing bath. After wet spinning, coagulation and water washing, the polym-phenylene isophthalamide spinning solution with an inherent viscosity of 2.3dL / g, a mass percent concentration of 18% and 9% calcium chloride is used , enter the dyeing bath in a tensioned state through the guide roller, control the immersion length of the fiber in the bath, make the fiber stay in the dyeing bath at 85°C for 3.5min, and assist ultrasonic vibration, the ultrasonic frequency is 25KHz, and then exit through the guide roller Dyeing bath, after drying, perform 3 times stretching heat treatment at 300°C. The pigment content in the obtained blue meta-aramid fiber is 1.3%, the fiber fineness is 2.3 dtex, and the fib...

Embodiment 2

[0020] The orange-red nano-scale inorganic composite pigment is ground by a ball mill and dispersed in water, and assisted by ultrasonic vibration, so that the average size of the pigment dispersion is about 120nm, and added to water to make a dispersion liquid containing 0.3% pigment as a dyeing bath. After wet spinning, coagulation and water washing, a polym-phenylene isophthalamide spinning solution with an inherent viscosity of 2.5dL / g, a mass percent concentration of 16% and 7.5% lithium chloride is used , enter the dyeing bath in a tensioned state through the guide roller, control the immersion length of the fiber in the bath, so that the fiber stays in the dyeing bath at 90°C for 4 minutes, and assist ultrasonic vibration, the ultrasonic frequency is 35KHz, and then exit the dyeing through the guide roller Bath liquid, after drying, perform 3 times stretching heat treatment at 300°C. The obtained orange-red meta-aramid has a pigment content of 1.2%, a fiber fineness of ...

Embodiment 3

[0022] The black nano-scale inorganic composite pigment is ground by a ball mill and dispersed in water, and assisted by ultrasonic vibration, so that the average size of the pigment dispersion is about 80nm, and added to water to make a dispersion liquid containing 0.1% pigment as a dyeing bath. The polym-phenylene isophthalamide spinning solution with an inherent viscosity of 2.3dL / g, a mass percent concentration of 18% and 3% triethylamine hydrochloride is used for wet spinning and coagulation , After washing with water, enter the dyeing bath in a tensioned state through the guide roller, control the immersion length of the fiber in the bath, make the fiber stay in the dyeing bath at 95°C for 5 minutes, and assist ultrasonic vibration, the ultrasonic frequency is 40KHz, and then pass through the guide roller Roll out the dyeing bath, and after drying, perform 3-fold stretching heat treatment at 300°C. The obtained black meta-aramid has a pigment content of 1.0%, a fiber fin...

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Abstract

The invention relates to a method for preparing colored meta-aramid. The method comprises the following steps: (1) performing ball-milling on pigments, dispersing, mixing and stirring in water, and performing auxiliary ultrasonic oscillation, thereby obtaining a uniform dye bath solution; (2) performing wet spinning, coagulating and washing on salty polyisophthaloyl metaphenylene diamine spinning solution, performing dyeing treatment in the dye bath solution, drying, performing thermal stretch treatment, curling, and cutting, thereby obtaining the colored meta-aramid. According to the method disclosed by the invention, the fibers are dyed by directly utilizing micro-pores remained in the fibers after spinning coagulation and washing salt removal, the pigments mainly enter the fiber surface layer and can be saved, the dye bath is easy to clean, the pipeline is not polluted by the bath solution, the fiber colors are convenient to replace, the method is suitable for small batch orders, and the production cost of the colored meta-aramid can be greatly saved.

Description

technical field [0001] The invention belongs to the field of meta-aramid fibers, in particular to a method for preparing colored meta-aramid fibers. Background technique [0002] Meta-aramid, the full name of poly-m-phenylene isophthalamide fiber, also known as aramid 1313 in my country, has excellent heat resistance (decomposition temperature greater than 400 ° C, long-term use temperature greater than 200 ° C), resistance Flame resistance (limiting oxygen index greater than 29%), excellent high temperature acid and alkali resistance, electrical insulation and good textile processing performance, widely used in protective clothing, high temperature filter materials, electrical industry and composite materials. When applied to protective clothing, it is often required that the fibers have different colors. However, due to the tight structure of the finished fiber and the fiber glass transition temperature Tg of meta-aramid fiber is 270°C, it is difficult to use the conventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P3/24D06P1/44D01F6/60
Inventor 胡祖明于俊荣王彦诸静刘立起杨威王丽丽
Owner DONGHUA UNIV
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