Substitute alkali for dyeing of dark reactive dyes

Abstract

The invention belongs to the technical field of dyeing and finishing, and particularly relates to substitute alkali for dyeing of dark reactive dyes. The substitute alkali is prepared from 10 to 15 weight percent of KOH, 30 to 45 weight percent of sodium metasilicate, 35 to 45 weight percent of K2CO3, 3 to 7 weight percent of EDTA and 3 to 7 weight percent of ethylenediamine. According to the substitute alkali, the defect that commercially available substitute alkali is insufficient in dyeing of dark reactive dyes such as red and black is made up for, the fixation rate of the substitute alkali to the red and black is 11%-15% higher than that of the commercially available substitute alkali and 2.43%-3.65% higher than that of sodium carbonate, and after dyeing, the wet rubbing fastness of the substitute alkali is 0.5 grade higher than that of the sodium carbonate, and the dry rubbing fastness is 1 grade higher than that of the sodium carbonate, so that the substitute alkali can replace the sodium carbonate to be used for dyeing of the dark reactive dyes.

Description

technical field [0001] The invention belongs to the technical field of dyeing and finishing, and in particular relates to a substitute alkali for dyeing dark reactive dyes. Background technique [0002] Reactive dyes are water-soluble dyes containing reactive groups. They are currently the most important type of dyes used for dyeing cellulose fibers. They can be covalently cross-linked with hydroxyl groups on cellulose molecules under alkaline conditions to achieve color fixation. Purpose. The traditional dyeing and finishing process mainly uses soda ash as a color-fixing alkali agent. The pH value of dyeing is stable and the reproducibility of dyed fabrics is good. However, there are defects such as large amount of soda ash used in the dyeing process, poor water solubility, and uneven dyeing. [0003] Aiming at the problems existing in traditional color-fixing alkali agents, many substitute alkalis have been developed, including EH, SA, FC, etc. The amount of substitute al...

AI Technical Summary

Problems solved by technology

The traditional dyeing and finishing process mainly uses soda ash as the color-fixing alkali agent, the pH value of dyeing is stable, and the reproducibility of dyed fabrics is good, but there are defects such as large amount of soda ash used in the dyeing process, poor water solubility, uneven dyeing, etc.

[0003] Aiming at the problems existing in traditional color-fixing alkali agents, many substitute alkalis have been developed, including EH, SA, FC, etc. The amount of substitute alkalis used in color fixing is significantly reduced, only about one-eighth of the amount of soda ash, and it is water-soluble Good, uniform dyeing, less dye hydrolysis, high color yield, etc., but in the actual use process, du

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