Salt-free low-alkali dyeing method for shortening dyeing time of reactive dye

Abstract

The invention relates to a salt-free low-alkali dyeing method for shortening dyeing time of a reactive dye, which belongs to the field of a textile printing and dyeing technology. By adoption of the method, a preparation and a process route of the dyeing liquid in the prior dyeing art are changed, by adopting the method of dyeing a to-be-dyed textile into a dyeing liquid mixed with a high-ratio ethanol organic solvent, a small amount of water and the dye, the problems that the dyeing time is longer and a dye-fixing agent is difficult to dissolve into an organic solvent in the traditional dyeing process are solved, the immersing dyeing time of the textile is greatly shortened, the salt-free dyeing of the textile is realized, and the dosage of the dye-fixing alkaline agent is reduced. The dyeing method related by the invention is simple in process, high in dye-fixing rate, and good in dyeing effect and color fastness, and furthermore, by adoption of the method, the dosage of water is greatly reduced, the dosages of chemical assistants are effectively reduced, the ethanol solvents can be recycled, the pollution is less, the cost is low, and therefore the dyeing method is clear, energy-saving, safe and environment-friendly.

Description

technical field [0001] The invention relates to a salt-free and low-alkali dyeing method for shortening the dyeing time of reactive dyes, belonging to the technical field of textile printing and dyeing. Background technique [0002] Reactive dyes are a class of important dyes widely used in the dyeing of cellulose fiber textiles. They have the characteristics of bright color, complete color spectrum, and excellent color fastness. However, reactive dyes have low directivity to cellulose fibers, and there is a problem of low dye uptake when dyeing cotton fabrics. Therefore, in the traditional dyeing process, a large amount of inorganic salt must be added to promote dyeing. When the dyeing process is over, these inorganic salts are discharged as a component of dyeing wastewater, causing water pollution, and the discharge of high-salt printing and dyeing wastewater will destroy the ecological environment of the water, and the high permeability of salt will cause pollution aroun...

AI Technical Summary

Problems solved by technology

However, the shortcoming is that these methods have certain limitations and are relatively complicated.

However, its disadvantage is that the process conditions of this method are complex and difficult to control.

However, its disadvantage is that this method needs to use a special modifying liquid to modify the cotton fabric

However, its shortcoming is that the practical dyes of this method are limited and have certain limitations.

Although it can indeed achieve salt-free dyeing by first modifying the cotton fabric and then dyeing it, its disadvantage is that the method needs to modify the cotton fabric first, the process is relatively complicated, and this modification process is only applicable For vinyl sulfone reactive dyes, the scope of application is narrow

Although it does have a certain effect by using cationic biological protein derivatives to modify cotton fabrics and then dye them, its disadvantage is that this method also first modifies cotton fabrics, and does not greatly reduce the dyeing of cotton fabrics. water consumption

Although the method of using organic solvent dyeing can indeed play the role of salt-free dyeing, its disadvantage is that the method is dyed first and then fixed, and does not fundamentally solve the problem of long soaking time of reactive dyes, and The soda ash added in the color fixing stage has a certain problem of insufficient dissolution in the organic solvent, which affects the quality of the finished dyed product

Although the method of adding organic solvents in batches can indeed control the dye uptake and levelness of dyes to a certain extent, its shortcomings still have not fundamentally solved the problem of long dyeing time of reactive dyes, not only the process is complicated And because the volatilization of organic solvent makes it difficult to control the problem of adding organic solvent in batches