Padding, wet steaming and dyeing method of reactive dye

Abstract

The invention relates to a padding, wet steaming and dyeing method of a reactive dye, belongs to the technical field of dyeing of textiles, and aims at solving the problems of a traditional padding, wet steaming and dyeing method of the reactive dye, in which cloth is directly steamed after being padded in a dyeing solution, the cloth with high water content is slowly heated, the steaming and fixation time is prolonged, and the reactive dye is highly hydrolyzed. The padding, wet steaming and dyeing method of the reactive dye is characterized in that the cloth is dehumidified in vacuum after being padded in the dyeing solution so as to enable the content of water of the cloth to be quickly lowered down to reach a certain level, then the cloth is steamed and fixed through saturation steam under normal pressure, and finally the cloth is washed with the water to finish the dyeing process. According to the method, the reactive dye is subjected to padding, wet steaming and dyeing, so that the problem that the steaming and fixation conditions fluctuate greatly due to high-water-content cloth in a steaming box can be avoided; the cloth heating rate is increased, the fixation time is reduced, the hydrolyzing of the dye on the cloth in a damp and hot and alkaline environment can be reduced, and therefore, the fixation rate of the reactive dye can be increased.

Description

technical field [0001] The invention relates to a reactive dye padding and wet-steaming dyeing method, which belongs to the technical field of textile printing and dyeing. Background technique [0002] Reactive dyes are a class of dyes widely used in cotton fabric dyeing. It has the advantages of complete color spectrum, bright color and excellent wet fastness. As a result, its fixation rate is low and the dye utilization rate is not high. [0003] Pad dyeing is one of the important dyeing methods of reactive dyes. At present, there are three common types of pad dyeing processes: cold pad batch, pad baking and pad steaming; among them, pad steaming is divided into pad-bake-steam, pad-bake-pad- Steam both processes. The dyeing process of the pad-steam process generally needs to go through a drying process to increase the heating rate of the fabric after entering the steamer, shorten the steaming fixation time, reduce the hydrolysis of the dye, and obtain a higher fixation r...

AI Technical Summary

Problems solved by technology

The dyeing process of the pad-steam process generally needs to go through a drying process to increase the heating rate of the fabric after entering the steamer, shorten the steaming fixation time, reduce the hydrolysis of the dye, and obtain a higher fixation rate and color fastness; but Intermediate drying will bring many problems: wet fabrics consume a lot of heat energy when drying, and dye migration is prone to occur; when dry fabrics are steamed, re-absorbing moisture and releasing condensation latent heat will cause overheating, which will affect the dyeing and color fixation of dyes. have adverse effects

This process has no special requirements for dyeing materials and equipment. The temperature of the fabric is already high when it comes out of the dryer. After entering the steamer, the temperature of the fabric rises quickly; at the same time, due to the low moisture content of the fabric, the dye is less hydrolyzed and the color fixation rate is high; However, in the process of using a dryer to reduce the moisture content of the fabric, the temperature of the wet fabric is relatively high, which may still cause the hydrolysis of the reactive dye, and it is prone to uneven drying.

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