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

Abstract

The invention relates to a soaping method for improving the post-treatment effect of fiber dyed by reactive dye. The method includes the following steps that 1, fiber dyed by the reactive dye is obtained; 2, water and a soaping agent are added in the fiber, and heating for soaping, wherein the temperature T1 of soaping is more than 100 DEG C and 110 DEG C when the reactive dye is low direct reactive dye, the temperature T2 of soaping is more than 110 DEG C and 120 DEG C when the reactive dye is middle direct reactive dye, and the temperature T3 of soaping is more than 120 DEG C and 130 DEG C when the reactive dye is high direct reactive dye. The soaping method can effectively remove surface dyeing in the fiber dyed by different kinds of direct reactive dye, the color fastness and color stability of the fiber are improved, meanwhile the number of times of washing in the fiber post-treatment process is reduced, the post-treatment process is shortened, water consumption and energy consumption are reduced, and the post-treatment cost is reduced on the 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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