Method for dyeing cotton fabric by adopting reactive dyes through foam wet steaming

Abstract

The invention provides a method for dyeing cotton fabrics by adopting reactive dyes through foam wet steaming, and belongs to the technical field of textile printing and dyeing. Foaming liquid containing color fixing agent and dye is passed through a foaming device to produce foam, the foam is applied on the fabric, after the foam is applied, the fabric is firstly sucked on the back surface of thefabric through a foam height limiter, then the fabric is steamed and fixed in normal pressure saturated steam, and then the after treatment of water washing and soaping is carried out, the dyeing process is completed. By adopting the method for carrying out reactive dye foam wet steaming dyeing, the temperature rise rate of the fabric can be improved, the color fixing time is shortened, the largefluctuation of the steaming color fixing condition caused by the fact that the fabric with high liquid content entering the steaming box is avoided, the hydrolysis of the dye on the fabric in the wetand alkaline environment is reduced, and cotton fabrics with different dyeing effects can be obtained by adjusting the dyeing process.

Description

technical field [0001] The invention relates to a fabric dyeing process, in particular to a fabric wet-steaming dyeing process, which is applied in the technical field of textile dyeing and finishing. Background technique [0002] Reactive dyes are a class of dyes widely used in cotton fabric dyeing. It has the advantages of complete color spectrum, bright color and excellent wet fastness. However, when dyeing reactive dyes, it needs to be fixed with alkali. , It is also accompanied by the hydrolysis reaction of the dye, resulting in a low color fixation rate and a low dye utilization rate. In order to improve the dye uptake rate of dyes, it is often necessary to add a large amount of inorganic salts to promote dyeing, so printing and dyeing wastewater has always plagued printing and dyeing enterprises. [0003] At present, there are three main types of reactive dyeing processes for cotton fabrics: cold pad-batch, pad-baking and pad-steaming, of which pad-steaming is divide...

AI Technical Summary

Problems solved by technology

The dyeing process of the pad-steam process generally needs to go through a drying process to increase the heating rate of the fabric after entering the steamer, shorten the steaming fixation time, reduce the hydrolysis of the dye, and obtain a higher fixation rate and color fastness; but There are many problems with intermediate drying: wet fabrics consume a lot of heat and are prone to dye migration, so dyers are always trying to find a better dyeing process

These all belong to the wet short steaming process. The characteristic lies in how to "short steam" to shorten the time in the environment of damp heat, high alkalinity and high liquid rate as much as possible. It has fast color fixation rate, less dye hydrolysis and high color fixation rate. , less dye migration, high dyeing quality, etc., but the imported equipment used in these wet steam dyeing methods is expensive, and the process control is difficult, and the domestic equipment needs to be improved.

Domestic also people have carried out some attempts in this respect, as the Chinese patent that publication number is CN104532499A discloses a kind of reactive dye padding wet-steaming dyeing method, is to carry out vacuum dehumidification to the fabric after fabric padding dyeing liquor earlier, reduces fabric liquid-carrying rate, and then fix the color by steaming, but this method has certain difficulties in operation in actual continuous dyeing

At present, the serious problem of dye hydrolysis during wet steam fixation of reactive dyes needs a low-cost and more effective solution, which has become an urgent technical problem to be solved.

Images