Method for dyeing pure cotton black yarns resistant to post-mercerizing strong base

Abstract

The invention discloses a method for dyeing pure cotton black yarns resistant to post-mercerizing strong base. The method comprises the following process steps: preparing a dyeing solution, dyeing, soaping twice, rinsing with hot water for three times, pickling, softening and squeezing water and drying. High-temperature reactive dyes are replaced by medium-temperature reactive dyes in a multiple-active group structure, the dye improvement rate is high, the color yield is high, and the compatibility of the dyes is excellent. Moreover, the dyeing temperature is low, the amount of the dyes is small, the dyeing cost is reduced, the alkali-resistant color fastness of the yarns is greatly improved after the dyed pure cotton black yarns are washed by a soaping solution containing a dispersing agent N, the post-mercerizing strong base resistance of the yarns is high after the yarns are subjected to color fixing through a reactive color fixing agent OS, and the yarns have high application value in actual production. After the yarns are dyed by the dyeing method, the alkali-resistant color fastness of the pure cotton black yarns reaches 4th-5th level, the staining fastness of the yarns reaches the 4th level, and the alkali-resistant fastness index of the colored yarns meets the standard requirement of China.

Description

technical field [0001] The invention relates to a dyeing method of mercerized colored yarn, in particular to a dyeing method of pure cotton black yarn resistant to post-mercerized strong alkali. Background technique [0002] The pure cotton high-count yarn is processed by singeing, mercerizing, dyeing, etc., to make silk-like bright luster, soft and wrinkle-resistant high-quality mercerized dyed yarn. The knitted fabric woven with this yarn is then processed twice After processing such as singeing, post-mercerizing, and softening, it becomes a high-grade pure cotton mercerized fabric. This "double silk double burning" pure cotton mercerized fabric not only fully retains the excellent natural characteristics of raw cotton fiber, but also has silky luster, soft hand feeling, good moisture absorption and breathability, full elasticity and drapability; plus Rich colors, comfortable and casual to wear, fully reflects the temperament and taste of the wearer. With the continuous ...

AI Technical Summary

Problems solved by technology

Due to the structural characteristics of this kind of dyes, most of the active groups are bis-chloro-s-triazine structure, which determines its alkali resistance, but the promotion rate is poor and the dyeing rate is low.

At present, all dye manufacturers do not have this type of black dye. Dyeing companies use high-temperature yellow, navy blue, and red color matching when dyeing black. The amount of dye is large, and the weight of dye to the fabric is more than 10% owf. The dyeing rate is low, the dye content and COD value in the waste liquid after dyeing are high, and the wastewater treatment is difficult; the dyeing temperature is as high as 80°C, and the energy consumption is large, so the dyeing cost is high

Although the general traditional medium-temperature reactive black dyes have good promotion rate, high dyeing rate, and low dyeing temperature of 60°C, most of them are composed of C.I. C.I. 82 orange with oxazine active group structure is blended, it is not alkali resistant, so the fabric woven from pure cotton black yarn dyed with this type of reactive dye cannot withstand strong alkali treatment after mercerizing

Images