Low Salt and Low Alkali Reactive Dyeing Process by Air Dyeing

Abstract

The invention discloses a low-salt and low-alkali active dyeing process for air dyeing, which comprises the following steps: A. Select a vinyl sulfone type reactive dye containing a group that activates the vinyl sulfone group, which is product A; Pretreat the fabric to obtain product B; C, put product B into the air-flow atomization dyeing machine, add product A into the vat, the bath ratio is 1:3~4; add sodium bicarbonate; add soda ash; heat up to 30°C , dye for 15-20min; then add soda ash; heat up to 55-65℃, dye for 20-30min; The conventional process washes and dries product D to obtain a finished product. The invention has the characteristics of improved dyestuff utilization rate, water resource saving, no need of acid neutralization, reduced cost and reduced sewage treatment difficulty.

Description

technical field [0001] The invention relates to the technical field of reactive dyeing by air-dyeing, in particular to a low-salt and low-alkali reactive dyeing process by air-dyeing. Background technique [0002] Reactive dyes have the characteristics of bright color, good level dyeing, simple dyeing method, high color fastness, complete color spectrum and low cost. Therefore, reactive dyeing is widely used. In the dyeing of cotton fabrics with traditional reactive dyes, the reactive groups of reactive dyes and cotton fibers are activated under alkaline conditions and then undergo addition reactions with the hydroxyl groups of fibers. The reactive groups of reactive dyes need to be consumed to activate More alkali agent, more alkali agent will cause the hydrolysis of the dye at the same time, and a large amount of salt needs to be consumed in the dyeing process, especially in air-flow dyeing, the consumption of alkali agent and salt is much greater than that of continuous d...

AI Technical Summary

Problems solved by technology

In the dyeing of cotton fabrics with traditional reactive dyes, the reactive groups of reactive dyes and cotton fibers are activated under alkaline conditions and then undergo addition reactions with the hydroxyl groups of fibers. The reactive groups of reactive dyes need to be consumed to activate More alkali agent, more alkali agent will cause the hydrolysis of the dye at the same time, and a large amount of salt needs to be consumed in the dyeing process, especially in air-flow dyeing, the consumption of alkali agent and salt is much greater than that of continuous dyeing. Acid neutralization is also required, and a large amount of water is consumed during washing, resulting in reduced dye utilization, waste of water resources, acid neutralization, high cost, and difficult sewage treatment.

Therefore, the reactive dyeing process of air dyeing has the problems of lower dye utilization rate, waste of water resources, need for acid neutralization, high cost, and difficult sewage treatment

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