High-fixation-rate non-aqueous solvent dyeing method for reactive dyes

Abstract

The invention provides an active dye non-aqueous solvent dyeing method with high color fixation rate. The method comprises the following steps: swelling a cotton fabric in an aqueous solution of an alkaline substance until the moisture content is 30 to 200 percent, and then drying the cotton fabric; mixing the dried cotton fabric with active dye and good solvent of the active dye, adding poor solvent of the active dye in the heating process, and preserving the heat until the temperature reaches a dyeing temperature; placing the dyed cotton fabric in an organic solution with more than two nucleophilic group compounds, and preserving the temperature for a period of time; then placing the cotton fabric in an organic solution with more than two electrophilic group compounds to be reacted; taking out the cotton fabric, neutralizing and washing the cotton fabric, and completing the dyeing. By adopting the active dye non-aqueous solvent dyeing method, little water is used, and the utilization rate of the dye is high.

Description

technical field [0001] The invention relates to a dyeing method of reactive dyes, in particular to a non-aqueous solvent dyeing method of reactive dyes with high color fixation rate, and belongs 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 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 hydrolyz...

AI Technical Summary

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 additives will also cause post-processing difficulties, high COD value of soaping wastewater, environmental pollution and waste of resources

2. Due to the high affinity of the high-concentration dye aqueous solution dispersed in the solvent system to the fiber, the dyeing speed is fast, it is not easy to control, and it is easy to dye flowers.

3. When dyeing, the cotton fiber first needs to be padded with a certain concentration of sodium carbonate aqueous solution, and dyed with a certain liquid rate. The water in the system will also cause the hydrolysis of the dye, so its color fixation rate is low.

The dispersant used in this dyeing process is only 0.15 times the amount of dye, and the dye uptake rate can reach nearly 100%, fully reflecting the advantages of non-aqueous solvent dyeing, but also due to the dispersion of dye particles in the solvent system on cotton The fiber has high affinity, so the dyeing speed is fast, and it is easy to dye flowers. Similarly, the water in the system will cause the hydrolysis of the dye, and the dye utilization rate is low

[0007] Although there have been a large number of literature reports on the dyeing process of reactive dyes with non-aqueous solvents, the fixation rate of reactive dyes is still low. The real meaning of solvent dyeing, at the same time, due to the high affinity of dyes to fibers in the solvent system, the dyeing rate is not easy to control, resulting in easy dyeing.

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