Method for improving dyeing uniformity of reactive dyes for wool yarns

Abstract

The invention discloses a method for improving the dyeing uniformity of reactive dyes for wool yarns. The method comprises the following steps: S1, wool pretreatment: dipping quantified wool fibers ina solution consisting of the following components in percentages by mass: 0.01-0.05% of sodium citrate, 0.02-0.04% of microcapsules, 0.02-0.05% of a penetrating agent, 0.05-0.08% of a wetting agent and the balance of water, and treating for 23-40 min at the dipping temperature of 35-55 DEG C; and S2, acid neutralization and washing: carrying out acid neutralization and washing on the wool fiberspretreated by the steps. The method is simple and practicable, the implementing cost is low, energy can be saved, pollution of water resources is reduced, by pretreatment, the inhibition effect of a scale layer during dyeing of wool can be weakened, the dyeing depth of the wood fibers to natural dyes and reactive dyes for wool can be increased quite obviously, the color fastness can be improved, in combination of a microcapsule dyeing technology, the wool dyeing uniformity can be improved effectively, uneven dyeing is avoided, and various properties of wool are improved.

Description

technical field [0001] The invention relates to wool yarn dyeing with reactive dyes, and more specifically relates to a method for improving the dyeing uniformity of wool yarn reactive dyes. Background technique [0002] Wool is a high-grade natural protein fiber with excellent properties such as soft luster, good resilience, strong moisture absorption, not easy to stain, light and warm; the outermost layer of wool is scale layer, which is transformed from protoplasmic cell membrane and is cutin The oxidized cells have strong chemical inertness, which will prevent the dye from entering the fiber during the dyeing process of wool; generally, high-temperature dyeing, pretreatment, mordant and other measures are required to promote dyeing during the dyeing process of wool. went smoothly. [0003] At present, when wool is dyed, because natural dyes have low affinity with fibers, the dyeing uptake and color fastness are unsatisfactory. The introduction of metal ion mordants that...

AI Technical Summary

Problems solved by technology

[0003] At present, when wool is dyed, because natural dyes have low affinity with fibers, the dyeing uptake and color fastness are unsatisfactory. The introduction of metal ion mordants that are usually used often leads to changes in the color of natural dyes, and metal in textiles. The content of ions exceeds the standard; when wool is dyed with reactive dyes, it generally requires more neutral salt to promote dyeing and high dyeing temperature to promote the smooth progress of dyeing, and the water pollution after dyeing is serious, which in turn increases the waste of water resources , it is very important to seek a pretreatment method that is simple and easy to do, with less damage to fiber strength, uniform dyeing after treatment, and can improve the color yield of wool surface during dyeing. Using alkali to pretreat wool is one of the ways. Therefore, we propose a method to improve the dyeing uniformity of wool yarn with reactive dyes