Dyeing method of cheese yarn subjected to low-temperature pretreatment

Abstract

The invention belongs to the field of dyeing auxiliary agents, and particularly relates to a method of using cationic starch for cheese yarn reactive dye dyeing, in particular to a dyeing method of cheese yarn subjected to low-temperature pretreatment. The method aims at solving the technical problems to realize the effects of improving the dyeing rate of reactive dye dyeing, reducing the rely oninorganic salts in the dyeing process, improving the color fixing rate after the dyeing at the same time and improving the production efficiency. The method comprises the following steps of pretreatment: putting the cheese yarn into alkaline liquid, raising the temperature to 50 to 70 DEG C at the speed of 1 to 3 DEG C / min, and performing treatment for 20 to 30 min; dyeing: preparing a cationic starch solution according to a certain bath ratio, adding the cheese yarn subjected to pretreatment, and performing soaking at normal temperature for 10 to 20 min; then, adding dye for soaking; color fixation: after the dyeing is completed, adding an alkaline agent into dyeing liquid, then raising the temperature to 60 to 90 DEG C at the speed of 1 to 3 DEG C / min, and performing heat insulation for30 to 60 min; drying: taking out a fabric, and performing drying; and post treatment: sequentially performing soap washing and water washing on the dried fabric to remove the unreacted dye, and finally performing drying.

Description

technical field [0001] The invention belongs to the field of dyeing auxiliaries, and in particular relates to a method in which cationic starch is applied to dyeing cheeses with reactive dyes, in particular to a method for dyeing cheeses after low-temperature pretreatment. Background technique [0002] Reactive dyes are easy to dye, complete in color spectrum, bright in color, good in uniformity, and low in price, so they are widely used in package yarn dyeing. However, reactive dye molecules contain anionic groups, which create a repulsive force with the negative charges on the surface of the package yarn during dyeing, resulting in low dye uptake and fixation rates, and often require repair and re-dyeing. In the traditional dyeing process, in order to overcome the charge repulsion effect and increase the dye uptake rate, a large amount of inorganic salt needs to be added, which not only increases the dyeing cost, but also causes serious environmental pollution due to the d...

AI Technical Summary

Problems solved by technology

[0003] Dyeing auxiliaries can achieve salt-free or low-salt dyeing of package yarns. Most of the early dyeing auxiliaries contain formaldehyde or will release formaldehyde at high temperature, which is harmful to human health.

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