Environment-friendly reactive dye low-temperature salt-free dyeing method for cotton fabric

Abstract

The invention relates to an environment-friendly reactive dye low-temperature salt-free dyeing method for cotton fabric. The environment-friendly reactive dye low-temperature salt-free dyeing method comprises the following steps of synthesis of a cationic polymer, modified treatment of the cotton fabric, dyeing, flocculation of dye wastewater, and the like. Under condition of taking potassium persulfate as an initiator, dimethyl diallyl ammonium chloride and allyl glycidyl ether are used to synthesize the cationic polymer; the cotton fabric is soaked into a cationic polymer aqueous solution ofcertain concentration to undergo modified treatment; and the modified cotton fabric can be dyed with reactive dye under a low-temperature salt-free condition, so that a dyeing rate and a color fixation rate of the dye are increased, and even dyeing is good. Water washing liquor of the modified cotton fabric is mixed with dyeing residual liquor and soaping liquor, and a little cationic polymer inthe solution is utilized for flocculating residual dyes in the dyeing wastewater, so that emission of printing and dyeing wastewater is greatly reduced, and practical production and environmental protection are facilitated.

Description

technical field [0001] The invention belongs to the field of salt-free dyeing of cotton fabric with reactive dyes. Background technique [0002] Reactive dyes can form covalent bonds with cotton fibers during the dyeing process, have excellent color fastness, bright color, complete color spectrum, low cost, and are widely used. They have become the most important dyes for cotton fiber textile dyeing. Reactive dyes include three parts: active group, hydrophilic group and dye matrix. The hydrophilic group is generally composed of sulfonic acid sodium salt, hydroxyl group, amino group, etc., and the sulfonic acid group makes a significant contribution to the hydrophilicity of the dye. The presence of sulfonic acid groups helps reactive dyes to dissolve in water, so that the dyeing process can be carried out in aqueous solution; however, the dye matrix is ​​negatively charged due to the dissociation of sulfonic acid sodium salt, which not only reduces the binding ability of nega...

AI Technical Summary

Problems solved by technology

Cationic reagents used for cotton fiber modification can generally be divided into two categories: the first category is small molecule cationic reagents, such as 3-chloro-2 hydroxypropyltrimethylammonium chloride, etc. , can enter the inside of the fiber very well, and the modification is relatively uniform, but the dosage is relatively large, and there are certain environmental pollution problems; the other type is high molecular cationic polymer, because of its large molecular weight and high cationic degree, the dosage is very small , but the modification is mostly limited to the surface of the fiber, which can easily lead to uneven modification, thus affecting the dyeing effect

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