A kind of reactive dye exhaust dyeing process of cotton fabric

Abstract

The invention discloses a reactive dye dip-dyeing technology of cotton fabric, comprising the following steps: S1, pretreatment: carrying out scouring and bleaching treatment on cotton fabric, and successively carrying out enzyme washing and sizing; S2, dyeing: immersing cotton fabric into reactive dye liquor, dyeing at 20-30 DEG C, heating to 70-100 DEG C at the speed of 2-3 DEG C / min, adding 1-5 g / L of soda ash according to volume of the reactive dye liquor, carrying out thermal insulation at the fixing temperature of 40-100 DEG C for 5-25 min, adding 5-20 g / L of chitosan quaternary ammonium salt according to volume of the reactive dye liquor, carrying out thermal insulation for 30-60 min, and finally cooling to room temperature; and S3, aftertreatment: washing the cotton fabric, soaping, washing, and air-drying. The reactive dye dip-dyeing technology of cotton fabric has advantages of high fixation rate and good level-dyeing property. In addition, the technology is simple. By the technology, dye wastewater can be greatly reduced, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of dyeing, in particular to a reactive dye exhaust dyeing process for cotton fabrics. Background technique [0002] Reactive dyes are named because the dye molecules contain reactive groups that react with fibers, and can also be called reactive dyes. Reactive dyes are the most important type of dyes for cellulose fiber dyeing due to their bright color, complete chromatogram, and excellent wet fastness. However, the dyeing fixation rate of reactive dyes is low, and the utilization rate of dyes is not high, especially for deep dyeing. When the dye concentration is greater than 3% o.w.f.), the color fixation rate of the dye is generally around 50-80%, that is to say, 20-50% of the reactive dye does not react with the fiber and is wasted. Waste increases the cost, and it is difficult to treat the discharged high-color wastewater, which is not conducive to environmental protection. [0003] In the traditional ...

AI Technical Summary

Problems solved by technology

Among them, the cationization of cotton fiber is a relatively effective way. Although it can effectively avoid the use of salt, the problem it brings is that the amount of cations is large, and there are many steps in the treatment of cation modification, and the operation is cumbersome.

In addition, people have also developed dyes with multi-reactive groups to increase the probability of reaction between dyes and fibers, but the dyes with multi-reactive groups are expensive, which limits their large-scale use

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