Salt free dyeing with reactive dye

Abstract

The invention provides a reactive dye salt-free dyeing process for cotton fiber, which comprises the following steps of pre-treatment, modified treatment, dyeing, post-treatment and so on. The modified treatment is that a copolymer of poly epichlorohydrin and polyamine used for cotton fiber is pretreated and cleaned under high temperature and alkali conditions before a special reactive dye used for a leveling agent is added to dye the cotton fiber, and the dyeing process is completed under salt-free, alkali-free or low-alkali conditions, thereby improving dyeing and fixing rate of the dye. The reactive dye salt-free dyeing process simplifies the prior dyeing process, is simple and easy to understand for operators, reduces influences of human operation factors on dyeing process and dyeing quality, and lowers production cost and sewage treatment cost overall.

Description

technical field [0001] The invention belongs to the textile bleaching and dyeing industry, and relates to the dyeing process of cotton fiber reactive dyes, in particular to a dyeing process of reactive dyes without salt, and even a dyeing method that can be dyed and fixed under neutral conditions. The process is especially suitable for the reactive dyeing process of cotton fiber or any appearance of textiles blended with it. Background technique [0002] Since the first variety of reactive dyes came out in 1956, it has developed for more than ten years to 1992. The world consumption has reached 63,000 tons, and there are 531 varieties. The development of reactive dyes for exhaust dyeing is of great significance for improving the grade of textiles and the structure of products, as well as multi-variety and small-batch dyeing. [0003] Reactive dye dyeing generally goes through three stages of adsorption, diffusion and fixation, the first two are the dyeing stage, and the las...

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Problems solved by technology

[0005] The existing cold-batch dyeing method better solves the problem of cotton fiber dyeing with reactive dyes under low-salt or no-salt dyeing conditions to achieve the highest fixation rate and best color fastness, and to achieve energy saving and consumption reduction. purpose, but this process has the following deficiencies: for example, the type of dye, the appearance of the fiber, and the selectivity of the dyeing equipment are extremely strong, and the dyeing needs to be stacked for 8-24 hours, the time is long, and a large amount of alkali agent is required to be fixed.

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