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Method for dyeing aramid fibers and dyed aramid fibers

A technology of aramid and dyeing method, which is applied in the field of aramid fiber, can solve the problems of insufficient dyeing, limited hue, uneven dyeing of dyed matter, etc., and achieve the effect of good light fastness and rich hue

Active Publication Date: 2013-12-18
TOKAI SENKO KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such dope-dyed fibers have limited hues, so there is a problem that they cannot fully respond to the rich hues required for various protective work clothes or the development of new uses for aramid fibers.
However, the dyeing method using these carriers or polar solvents at high temperature is mainly used for dyeing meta-aramid fibers, and for para-aramid fibers or para-position copolymerized aramid fibers not enough for dyeing
In addition, for the dyeing of meta-aramid fibers, dyeing methods using these carriers or polar solvents at high temperatures also have problems such as uneven dyeing of dyed products, dimensional changes due to shrinkage, and physical property degradation.

Method used

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  • Method for dyeing aramid fibers and dyed aramid fibers
  • Method for dyeing aramid fibers and dyed aramid fibers
  • Method for dyeing aramid fibers and dyed aramid fibers

Examples

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no. 1 approach

[0055] The dyeing method according to the first embodiment includes a dye imparting step of imparting a vat dye or a sulfur dye to the aramid fiber, and a solvent treatment step of treating the aramid fiber with a treatment liquid containing a polar solvent. The order of the dye imparting step and the solvent treatment step is not particularly limited, but it is preferable to perform the solvent treatment step after the dye imparting step. In the first embodiment, firstly, a dye imparting step of imparting a vat dye or a sulfur dye to the aramid fiber in a non-reduced state is performed, and then the vat dye or sulfur dye is imparted to the aramid fiber with a treatment liquid containing a polar solvent. Solvent treatment process for processing aramid fibers.

[0056] In this first embodiment, the series of steps described above are collectively referred to as "dyeing operation 1". In addition, this dyeing operation 1 (dye-imparting process→solvent treatment process) may be p...

no. 2 approach

[0083] The dyeing method according to the second embodiment includes: a dye imparting step of imparting a vat dye or a sulfur dye to aramid fibers, a solvent treatment step of treating aramid fibers with a treatment solution containing a polar solvent, and treating the aramid fibers with a solvent. A heat treatment step in which the aramid fiber after the step is heat-treated. In this second embodiment, the series of steps described above are collectively referred to as "dyeing operation 3". In addition, this dyeing operation 3 (dye-imparting process→solvent treatment process→heat treatment process) may be performed only once, or may be repeated multiple times as needed. By repeating this dyeing operation a plurality of times, darker colored aramid fibers can be obtained.

[0084] A. Dye imparting process

[0085] The dye application process in this 2nd Embodiment performs the same operation as the dye application process in the said 1st Embodiment.

[0086] B. Solvent trea...

no. 3 approach

[0098] The dyeing method of the present third embodiment, before the dyeing operation 1 or the dyeing operation 3 explained in the above-mentioned first embodiment or the above-mentioned second embodiment, has the method of using dyes other than vat dyes and sulfur dyes to para-aramid fibers. A pre-dyeing process for dyeing. It should be noted that the above-mentioned dyeing operation 1 or dyeing operation 3 performed after the pre-dyeing process may be performed only once, or may be repeated multiple times as necessary. By repeating this dyeing operation 1 or dyeing operation 3 a plurality of times, darker colored aramid fibers can be obtained.

[0099] D1. Pre-dyeing process

[0100] In the dyeing method of the third embodiment, first, the undyed aramid fiber is subjected to a pre-dyeing step. In this pre-dyeing process, a dyeing solution containing dyes other than vat dyes and sulfur dyes is used. The dyeing method in this pre-dyeing step may be any method, but dyeing is...

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Abstract

Provided are a method for dyeing aramid fibers and dyed aramid fibers. The method is applicable to any of para-aramid fibers, para-coaramid fibers, and meta-aramid fibers and by which aramid fibers are dyed in practical concentrations required for new applications of aramid fibers. The dyed aramid fibers have suffered neither considerable dyeing unevenness nor a considerable dimensional change nor a considerable decrease in material property. The dyed fibers further have satisfactory color fastness, in particular, light fastness. The dyeing method which comprises one or more dyeing operations each comprising a combination of the following steps: a dye application step in which a vat dye or a sulfur dye is applied to the aramid fibers; a solvent treatment step in which the aramid fibers are treated with a treating liquid comprising a polar solvent; and a heat treatment step in which after the solvent treatment step, the aramid fibers are heat-treated according to need.

Description

technical field [0001] The present invention relates to a dyeing method for aramid fibers, and more particularly to a dyeing method capable of dyeing aramid fibers to a practical dyeing density. In addition, the present invention relates to aramid fibers dyed by the method. Background technique [0002] Fully aromatic polyamide fiber is also called aramid fiber, which has high strength, high elastic modulus, and excellent heat resistance, dimensional stability, chemical resistance, etc., so it is used in a wide range of applications as industrial fibers use. The aramid fiber can be roughly divided into the following three types according to the position of the amide bond on the aromatic ring: para-aramid fiber (poly-paraphenylene terephthalamide fiber, etc.); family polyamide fibers (poly-p-phenylene terephthalamide and 3,4'-oxydiphenylene terephthalamide copolymer fibers, etc.); and meta-aramid fibers (polyisophthalamide Diformyl m-phenylenediamide fibers or copolymer fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P3/24D06P1/22D06P1/30D06P5/02D06P5/04
CPCD06P1/22D06P1/30D06P3/243D06P5/001D06P5/02D06P3/24D06P5/04D06P5/22
Inventor 大岩宪博今井一辉佐山昇平伊藤高广安井彰
Owner TOKAI SENKO KK
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