Reactive dye non-aqueous medium dyeing and soaping method

Abstract

The invention provides a reactive dye non-aqueous medium dyeing and soaping method. The method includes the steps: placing fibers in an aqueous solution of an alkaline substance, swelling, and then drying; carrying out non-aqueous medium dyeing on the dried fibers with a reactive dye; and placing the fibers obtained after reactive dye dyeing in an organic solvent containing a cationic reagent, and soaping. The cationic reagent is a quaternary ammonium salt compound; the organic solvent can dissolve the reactive dye or can dissolve the reactive dye with the help of the cationic reagent; the concentration of the cationic reagent in the organic solvent is 0.1-10 g / L, and the soaping bath ratio is 1:(1-30). The method achieves complete dyeing of the fibers with the reactive dye and color fixation with superhigh color fixation rate, after completion of dyeing, unfixed floating colors are removed by an anhydrous soaping process, the whole dyeing and soaping process is needless to water consumption, short in cycle, low in energy consumption, and good in fastness property.

Description

technical field [0001] The invention relates to a dyeing and soaping method of reactive dyes, belonging to the technical field of textile dyeing and finishing. Background technique [0002] At present, reactive dyes are mostly used in the dyeing of reactive fibers. During the dyeing process, due to the hydrolysis of the active groups in the water medium, not only a large amount of reactive dyes are wasted, but also a large amount of water is consumed during the dyeing process and a large amount of high Chroma sewage, which is also an insurmountable bottleneck for reactive dyes. [0003] In order to avoid the hydrolysis reaction of reactive dyes and improve the utilization rate of reactive dyes, scientists have paid attention to and studied the dyeing of reactive dyes in non-aqueous media very early. The advantage of using non-aqueous medium dyeing is that reactive dyes will not be hydrolyzed during the dyeing process, which is expected to increase the degree of reaction bet...

AI Technical Summary

Problems solved by technology

However, there are the following problems in the reverse micellar dyeing process: (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 causes a large amount of adsorption on the cloth sample during the dyeing process. Surfactants and additives will also cause post-processing difficulties, high COD values ​​of soaping wastewater, environmental pollution and a certain waste of resources; (2), due to the high affinity of the high-concentration dye aqueous solution dispersed in the solvent system to the fiber , so the dyeing speed is fast, it is not easy to control, and it is easy to dye flowers; (3), when dyeing, the fiber first needs to be padded with a certain concentration of sodium carbonate aqueous solution, and dyed with a certain liquid rate, the water existing in the system will also Causes hydrolysis of the dye, therefore, lower fixation rate

[0009] In summary, although there have been a large number of reports in the literature on non-aqueous solvent dyeing of reactive dyes, the color fixation rate of reactive dyes is generally low, and a large amount of water is still needed to wash off the residual floating color on the fiber after dyeing. Lose the real meaning of non-aqueous solvent dyeing

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