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
CN103459710AActive Publication Date: 2013-12-18TOKAI SENKO KK +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TOKAI SENKO KK
Publication Date
2013-12-18

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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.
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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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