Post mercerization alkali resisting pure cotton black yarn dyeing recipe and preparation method thereof

Abstract

The invention discloses a post mercerization alkali resisting pure cotton black yarn dyeing recipe and a preparation method thereof. A moderate-temperature type reactive dye replaces a high-temperature type reactive dye, a reactive black G dye with a vinyl sulfone and monochloro s-triazine MCTVS structure is adopted, the alkali resistance of the reactive black G dye is improved by compared with that of a common moderate-temperature type reactive dye, the reactive black G dye is used as a main dye during dyeing, through the shading of three matched dyes of reactive red S-3B, the reactive yellow TS-3R and reactive dark blue S-G which are good in alkali resistance, a dyeing solution is prepared, dyeing is performed under the condition of a moderate temperature of 60 DEG C, black which is pure and normal in coloured light, fuliginous and bright and has various coloured light can be obtained, and the requirements of customers to color of black yarns can be met. The dyeing solution not only has the effect of resisting high-concentration alkali in post mercerization when being used for dyeing pure cotton yarns, can ensure that dyed yarn after dyeing meets the national standard requirements to alkaline-resisting fastness indexes, but also has the advantages that the dyeing temperature is low, energy consumption is low, and the dyeing cost is lowered greatly.

Description

technical field [0001] The invention relates to a dyeing prescription for mercerized colored yarn and a preparation method thereof, in particular to a dyeing prescription and a preparation 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 ...

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

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