Soaping method for improving post-treatment effect of reactive dye dyed fiber

Abstract

The invention relates to a soaping method for improving the post-treatment effect of fibers dyed with reactive dyes, comprising the following steps: (1) obtaining fibers dyed with reactive dyes; (2) adding water and a soaping agent to the fibers, and then raising the temperature Carry out soaping: when described reactive dyestuff is low substantivity reactive dyestuff, the temperature T of described soaping 1 100℃<T 1 <110°C; when the reactive dye is a medium direct reactive dye, the soaping temperature T 2 110℃≤T 2 ≤120°C; when the reactive dye is a highly direct reactive dye, the soaping temperature T 3 120℃<T 1 ≤130°C. The soaping method can effectively remove the floating color in the fiber dyed with reactive dyes of different directness, improve the color fastness and color stability of the fiber, reduce the number of washings in the post-treatment of the fiber, shorten the post-treatment process, and reduce the Reduce water consumption and energy consumption, and reduce post-treatment costs as a whole.

Description

technical field [0001] The invention relates to the technical field of fiber dyeing, in particular to a soaping method for improving the aftertreatment effect of fibers dyed with reactive dyes. Background technique [0002] Reactive dyes have simple molecular structure, complete color, relatively complete chromatogram, convenient use, and low cost. In addition, they contain sulfonic acid water-soluble groups, which can be ionized into dye anions in water, and have high stability to hard water, diffusibility and uniformity. It has good dyeability and is the most widely used dye type at present. [0003] However, reactive dyes have the disadvantage of low color fixation rate, and the hydrolyzed products obtained by the hydrolysis reaction with water generally cannot react with the fibers, so the dye utilization rate is very low, and the hydrolyzed dyes on the raffinate and fibers can be as high as 30% to 45%. %, at the same time, due to the affinity of hydrolyzed dyes to cell...

AI Technical Summary

Problems solved by technology

The directness of different dye matrix structures to fibers is different, and the directness is low, which will affect the dyeing rate and color fixation rate of reactive dyes; the directness is too high, because some reactive dyes will form hydrolyzed dyes when they react, These highly substantive hydrolyzed dyes are difficult to wash off the fibers, causing staining and reduced color fastness

Existing methods usually do not distinguish reactive dyes with different directness during soaping, thus easily causing defects such as color instability, low color fastness, and waste of energy

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