Method for improving fixation rate of reactive dye in alcohol organic solvent-water system

Abstract

The invention discloses a method for improving the fixation rate of a reactive dye in an alcohol organic solvent-water system. The method includes modifying a pre-dyed cotton textile by adopting a treatment method that an alkali liquor and a cation modifier are in the same bath, and then directly dyeing in the alcohol organic solvent-water system; remarkably improving the affinity between the cotton textile and the reactive dye through the synergistic effect of alkali liquor pre-swelling and cation modifier modification treatment, so as to improve the fixation rate of salt-free dyeing of the cotton textile and the K/S value after soaping; and meanwhile, placing the cotton textile in the alcohol organic solvent-water system, performing alkali liquor pre-swelling, and then performing cationic modification. on one hand, the alkali liquor is used as a nucleophilic reagent combined with the cation modifier and the cotton textile, on the other hand, the alkali liquor is used as a fixing agent for dyeing the modified cotton textile, and the modified cotton textile is directly dyed without water washing, so that the fixing rate of the reactive dye in the alcohol organic solvent-water system is obviously improved.

Description

technical field [0001] The invention relates to the field of textile printing and dyeing processing, in particular to a method for improving the fixation rate of reactive dyes in an alcohol organic solvent-water system. Background technique [0002] Reactive dyes are named because the dye molecules contain reactive groups that react with fibers, and can also be called reactive dyes. Due to its bright color, complete chromatogram, simple application process, excellent fastness, and the ability to form covalent bonds with many fibers, reactive dyes have become the most important type of dyes for cellulose fiber and fabric dyeing. However, the dyeing fixation rate of reactive dyes is low, and the utilization rate of dyes is not high, especially when dyeing dark colors (the dye concentration is greater than 3% o.w.f.), the dye fixation rate is generally about 50-80%, so there will be 20- 50% of reactive dyes are wasted without reacting with fibers, which not only causes waste o...

AI Technical Summary

Problems solved by technology

Triazine-type quaternary ammonium salt compounds are too reactive with cotton fibers, and the modifier reacts preferentially on the surface of the fibers, affecting the diffusion of subsequent dyes; azetidine cationic compounds need to be treated with high-temperature thermosetting processes, which will Causes a certain degree of damage to the fiber; N-methylolacrylamide will release formaldehyde during storage and use; Glytac reagent is simple to synthesize, relatively low in cost, and evenly modifies cotton fabrics, but the ring in the structure of Glytac reagent Oxygen groups are easy to hydrolyze and have poor thermal stability. Migration is easy to occur during high-temperature melting and drying treatment, so it is easy to cause uneven dyeing

Due to the relatively small molecular weight of the small-molecule cationization reagent auxiliary, the auxiliary molecules can enter the interior of the cotton fiber through diffusion, and the cotton fiber can be uniformly modified. Good penetrability, but the amount of such cationic reagents is relatively large, and there are many cationic modification steps, and the operation is cumbersome

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