Method for cation modification and salt-free dyeing of cellulose fabric through one bath

Abstract

The invention discloses a method for cation modification and salt-free dyeing of a cellulose fabric through one bath. The method comprises the following steps: (1) preparation of a modified dyeing liquid, including uniformly dissolving a reactive dye and sodium hydroxide in soft water, uniformly mixing the reactive dye and sodium hydroxide, adding a modifier in the obtained mixture, and performing uniform mixing to obtain the modified dyeing liquid; and (2) modification dyeing of a fabric, including performing dip padding treatment of a cellulose fabric with the modified dyeing liquid prepared in the step (1), winding the fabric into a roll after one dip and one padding, covering the roll with a film, putting the obtained roll at the room temperature, and performing room-temperature washing, acid washing, soaping, hot water washing, room-temperature washing and drying to the obtained fabric to obtain the salt-free dyed fabric. Cation modification and salt-free dyeing are carried out in one bath. The method is less in process, simple in technology and easy to operate. Acid washing and multiple water washing before dyeing in a two-bath method is not required, so that the method is less in water consumption and the process is easy to control. Modification and dyeing are carried out at the room temperature, and hydrolysis of the modifier and dye is reduced.

Description

technical field [0001] The invention belongs to the field of salt-free dyeing of cellulose fiber fabrics, in particular to a method for cationic modification of cellulose fiber fabrics and salt-free dyeing of reactive dyes in the same bath. Background technique [0002] Reactive dyes have the characteristics of complete chromatograms and bright colors. Through chemical reactions between their active groups and hydroxyl groups on cellulose, they are combined with fabrics through chemical bonds. They have good color fastness and are the main dyes for cellulose fiber fabrics. However, in the dyeing solution, reactive dyes are anionic, and the hydroxyl anions on the cellulose fibers repel each other. In order to solve this problem, a large amount of inorganic salt (yuanming powder or table salt) needs to be added in the dyeing solution. The treatment of the inorganic salt in the dyeing residue is difficult, and discharge into rivers will cause serious environmental problems. Ca...

AI Technical Summary

Problems solved by technology

Many procedures are troublesome to operate. The modification temperature is usually above 60°C, resulting in large hydrolysis of the modifier and low effective utilization rate. The small molecule modifier will release irritating gas during modification and even the dyeing process afterwards, resulting in the deterioration of the production environment.

In short, the existing process consumes water and energy, the amount of modifier is large, the production cost is high, and the production environment is not good

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