Novel dyeing method of reactive dyes

Abstract

The invention provides a novel dyeing method of reactive dyes. The method includes the steps of conducting preprocessing, wherein loose fiber or yarn or fabric is preprocessed; conducting dyeing, wherein the preprocessed loose fiber or yarn or fabric is dyed in the reactive dyes through a water-saving dyeing method; conducting color fixing, wherein the dyed loose fiber or yarn or fabric is directly soaked in color fixing liquid to be subjected to color fixing and is then baked so that the dyeing process of the reactive dyes can be completed. In the dyeing step, the structure of the reactive dyes at least contains three active groups. According to the technical scheme, operation is easy, no salt is used in the dyeing process, and the good dyeing and color fixing effects can be achieved with a smaller volume of water; in addition, water used in the dyeing process can be directly evaporated in the subsequent operation process, no washing operation is needed after color dyeing and fixing, and therefore no dyeing wastewater can be produced after operation is ended, and clean production is achieved.

Description

technical field [0001] The invention relates to a novel dyeing method of reactive dyes, which belongs to the field of textile dyeing and finishing. Background technique [0002] In the traditional cotton fabric dyeing system using water as the medium, reactive dyes will undergo hydrolysis side reactions during alkaline fixation, thus losing the ability to covalently bond with cellulose fibers, greatly reducing the utilization of reactive dyes; At the same time, in order to obtain the required dyeing fastness to wet treatment after dyeing, it is necessary to remove the hydrolyzed dye distributed in the fiber interior, fiber surface and inter-fiber capillary network channels through sufficient washing. Therefore, in the traditional dyeing process, reactive The dye fixation rate is not high (about 40-85%). [0003] In addition, the traditional dyeing process consumes a lot of water and energy, and discharges a lot of sewage during the dyeing process; although it is recorded in...

AI Technical Summary

Problems solved by technology

[0002] In the traditional cotton fabric dyeing system using water as the medium, reactive dyes will undergo hydrolysis side reactions during alkaline fixation, thus losing the ability to covalently bond with cellulose fibers, greatly reducing the utilization of reactive dyes; At the same time, in order to obtain the required dyeing fastness to wet treatment after dyeing, the hydrolyzed dye distributed in the fiber interior, fiber surface and inter-fiber capillary network channels must be removed by sufficient washing. Therefore, in the traditional dyeing process, reactive The color fixation rate of the dye is not high (about 40-85%)

[0003] In addition, the traditional dyeing process consumes a lot of water and energy, and discharges a lot of sewage during the dyeing process; although it is recorded in the prior art that dyeing with a small liquor ratio is used, it has not been widely used in this field, mainly because of the small liquor ratio dyeing. It is easily affected by the solubility of dyes, equipment specificity, dyeing levelness and easy abrasion of the fabric surface, and cannot obtain satisfactory results

[0004] Although the prior art utilizes pure organic solvents for dyeing to improve the utilization rate of reactive dyes, this method is limited by the variety of dyes, the safety of solvents and the feasibility of dyeing processes, and has not been popularized.