Active dye non-aqueous solvent dyeing method without wet post-treatment

Abstract

The invention provides an active dye non-aqueous solvent dyeing method without wet post-treatment. The method comprises the following steps: carrying out cation modification on a cotton textile; mixing the modified cotton textile with an active dye and a good solvent of the active dye; heating to a dyeing temperature at a speed of 1 DEG C / min and dyeing; adding a poor solvent of the active dye in the heating process and preserving heat for a period of time, wherein the volume ratio of the good solvent of the active dye to the poor solvent of the active dye is 1 to (3-20) and the mass ratio of the good solvent of the active dye to the cotton textile is (2-50) to 1; and drying the cotton textile to finish dyeing, wherein the good solvent of the active dye is a non-aqueous solvent which can be used for dissolving the active dye but is not subjected to a chemical reaction with the active dye, and the poor solvent of the active dye is a non-aqueous solvent which cannot be used for dissolving the active dye and is not subjected to a chemical reaction with the active dye. The active dye non-aqueous solvent dyeing method provided by the invention has a high fixation rate and does not need a wet post-treatment step.

Description

technical field [0001] The invention relates to a dyeing method of reactive dyes, in particular to a dyeing method of non-aqueous solvents for reactive dyes after moisture-free post-treatment, 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 cotton fabrics. 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 and a large amount of high-color dyes that are difficult to handle are discharged during the dyeing process. High-degree 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...

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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 cotton fibers, 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.

[0007] Although reactive dye non-aqueous solvent dyeing has a large number of literature reports, the fixation rate of reactive dye is still low, and a large amount of water is still needed to wash away the residual alkali agent and floating color on the cotton fiber after dyeing, which also means Lost the real meaning of non-aqueous solvent dyeing

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