Non-aqueous-medium dyeing and washing-free color fixation method for reactive dye

Abstract

The invention provides a method for non-aqueous medium dyeing and water-free color fixation of reactive dyes. The method includes: 1) placing the fabric or garment in an alkaline substance for swelling, controlling the liquid carrying rate, and drying; 2) mixing the fabric or garment with a reactive dye or a good solvent of the reactive dye and then heating it, before heating or During the heating process, add the poor solvent of the reactive dye, heat it up to the dyeing temperature, and then perform insulation dyeing. After the dyeing is completed, dry the fabric or garment; 3) Directly apply the color-fixing working solution evenly to the above-mentioned dryer by spraying or foaming. After drying both sides of the fabric or garment, control the liquid-carrying rate of the fabric or garment, and then bake to complete the non-aqueous medium dyeing of reactive dyes and water-free color fixation. The technical solution provided by the invention not only greatly improves the utilization rate and dye uptake rate of reactive dyes, but also effectively reduces the water consumption and wastewater discharge during the dyeing process.

Description

Technical field [0001] The invention relates to a method for non-aqueous medium dyeing and water-free color fixation of reactive dyes, and belongs to the technical field of textile dyeing and finishing. Background technique [0002] At present, the dyeing of reactive dyes is mainly carried out in aqueous medium. However, because the reactive groups of reactive dyes are prone to hydrolysis in aqueous medium, it not only leads to the waste of reactive dyes, but also requires a large amount of water consumption and a large amount of difficult emissions in the subsequent process. The treatment of high-color sewage has also been a bottleneck in the application of reactive dyes. [0003] In order to avoid the hydrolysis reaction of reactive dyes in aqueous media and improve the utilization of reactive dyes, scientists have long paid attention to and studied the dyeing of reactive dyes in non-aqueous media. The advantage of using non-aqueous medium for dyeing is that reactive dyes...

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Problems solved by technology

However, the reverse micellar dyeing process has the following problems: 1. The amount of surfactant and co-surfactant in the system is relatively large, and the amount of a large amount of surfactant and auxiliary agent will cause a large amount of surface adsorption on the cloth sample during the dyeing process. Active agents and auxiliary agents will also cause difficulties in post-processing, high COD values ​​in soaping wastewater, environmental pollution, and a certain waste of resources; Clothing has high affinity, so the dyeing speed is fast, it is not easy to control, and it is easy to dye flowers; 3. When dyeing, loose fibers, yarns, fabrics or garments must first be padded with a certain concentration of sodium carbonate aqueous solution, and with a certain liquid rate. Dyeing, the water in the system will also cause the hydrolysis of the dye, therefore, its color fixation rate is low

[0008] The recent research on non-aqueous solvent dyeing of reactive dyes has made great progress. The non-aqueous solvent dyeing method of reactive dyes developed by Guangdong Esquel Textile Co., Ltd. has a fixation rate of more than 95%. After dyeing with reactive dyes, most dyes can be mixed with fibers. Reactive reaction, firmly combined with the fiber through chemical bonds, but there is still a small part of the dye, which does not form a chemical bond with the fiber, but remains on the surface of the fiber (this part of the residual dye accounts for about 1-5%) ), if this part of the residual dye does not go through the post-treatment process, it will affect the color fastness; while the conventional color fixing process needs to undergo multiple soaping or cleaning treatments for the floating color, and then fix the color by dipping or padding, otherwise When the unwashed or soaped fiber is directly fixed by dipping or padding, the floating color on the surface of the fiber will be dissolved in the fixing solution again during the color fixing, resulting in staining or dyeing

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