Dyeing method for improving dyeing evenness of reactive dye solvent

Abstract

The invention provides a dyeing method for improving the dyeing evenness of a reactive dye solvent. The method comprises: fully swelling and drying loose fibers, yarn, fabrics or garments in an aqueous solution of an alkaline substance, mixing the dried loose fibers, yarn, fabrics or garments and a reactive dye good solvent to obtain a mixed system, heating the mixed system, wherein before heatingor in heating, a reactive dye poor solvent is added into the mixed system, heating the system to 60-80 DEG C, carrying out heat preservation for 5-20min, carrying out cooling to 30-50 DEG C, carryingout heating, repeating heating, heat preservation and cooling circulation 2-5 times, carrying out heating to a finished dyeing temperature, carrying out heat preservation, and neutralizing, washing and drying the dyed loose fibers, yarn, fabrics or garments after dyeing. The novel method provides the opportunity for the precipitated dye to move, repeats heating, heat preservation and cooling circulation multiple times, realizes homogenization of dyes at different positions of the dyed object and realizes dyeing homogenization.

Description

technical field [0001] The invention relates to a dyeing method for reactive dye solvent dyeing, in particular to a dyeing method for improving the levelness of reactive dye solvent dyeing, 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 h...

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] In order to achieve a higher dye fixation rate, Guangdong Esquel Textile Co., Ltd. has developed a good solvent / poor solvent dyeing system, which can obtain a super high dye utilization rate, but the dyeing process of this dye system is completely different from the water medium , after the temperature rises, the dye precipitates directly onto the fiber, and then the color fixation reaction occurs, there is no dye migration process of dye adsorption-desorption, which will easily lead to uneven color and flowers

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