A kind of dyeing method of pure cotton black yarn resistant to mercerized strong alkali

Abstract

The invention discloses a dyeing method of pure cotton black yarn resistant to post-mercerized strong alkali, which comprises dyeing solution preparation, dyeing, soaping twice, hot water washing three times, pickling, softening, squeezing and drying processes. The medium-temperature reactive dye with multi-reactive group structure replaces the high-temperature reactive dye, which has good dye promotion rate, high color yield, excellent dye compatibility, low dyeing temperature, less dye consumption, and reduced dyeing cost. The pure cotton after dyeing is black The color fastness to alkali staining is greatly improved after the yarn is washed with the soap solution containing the diffusing agent N, and then treated with the reactive color fixing agent OS, the yarn has good resistance to mercerizing and strong alkali, and has relatively good performance in actual production. Strong application value. After being dyed by this dyeing method, the alkali fastness of the pure cotton black yarn is a color fastness of 4-5 grades, and a staining fastness of 4 grades, and the alkali fastness index of the colored yarn meets the requirements of the national standard.

Description

Technical field [0001] The invention relates to a dyeing method of mercerized color thread, in particular to a dyeing method of pure cotton black yarn resistant to post-mererization and strong alkali. Background technique [0002] The pure cotton high-count yarn is processed by singeing, mercerizing, dyeing and other processing steps to produce silk-like bright luster, soft and wrinkle-resistant high-quality mercerized dyed yarn. The knitted fabric woven with this yarn is processed twice After singeing, post mercerizing, softening and other processes, it becomes a high-grade pure cotton mercerized fabric. This "double-filament and double-burning" pure cotton mercerized fabric not only completely retains the excellent natural characteristics of raw cotton fiber, but also has silky luster, soft feel, good moisture absorption and breathability, full elasticity and drape; plus Rich in patterns and colors, comfortable and casual to wear, which fully reflects the temperament and taste...

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 the 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 post-mercerizing strong alkali treatment

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