Salt-free dyeing method of vinyl sulphone type reactive dye for cotton fiber

Abstract

The invention relates to a salt-free dyeing method of vinyl sulphone type reactive dye for cotton fiber, mainly comprising the steps of modifying cotton fiber, dyeing the cotton fiber and the like. The modifying treatment is realized by the steps of: soaking and rolling the cotton fiber by a solution containing acrylamide respectively for two times, and then soaking in a sodium hypochlorite solution to perform Hoffman degradation. The modified cotton fiber is dyed by the vinyl sulphone type reactive dye under a salt-free condition; and therefore, the dyeing rate and the color fixing rate of the dye are improved. By use of the salt-free dyeing method, the content of inorganic salts in dyeing wastewater is reduced, benefit is brought for environment protection, a cotton fiber modifying process can be combined with a chlorine blanching process, the production process is simple and the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of salt-free dyeing of reactive dyes, in particular to a method for salt-free dyeing of vinyl sulfone type reactive dyes. Background technique [0002] Reactive dyes are known for their bright color, complete chromatogram, easy application, excellent fastness, and excellent performance. In addition, they can replace banned dyes and other types of dyes, and are suitable for new natural fibers. Now they have developed into the most important dyes for natural fibers. It has become a kind of dye species that the world's dye industry focuses on and pays attention to. Among the commercial reactive dyes currently appearing in the international dyestuff market, most of the reactive dye varieties have active groups composed of halogenated s-triazine or β-hydroxyethyl sulfone sulfate; in order to ensure the activity Dyes have excellent wet fastness. Therefore, when designing the molecular structure of reactive dyes, people usu...

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Problems solved by technology

But so far there are still many problems in the modification process of cotton fiber, such as the obvious decline in the wearability (breathability, moisture permeability and tear strength) of dyed fabrics, the high price of raw materials, the process is more complicated, the cost is higher, and the toxicity is relatively high. Large, difficult for industrial applications, etc.

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