Amphoteric water soluble color-fixing agent and its application

Abstract

The present invention relates to one kind of amphoteric water soluble polymer color-fixing agent and its synthesis and use. The amphoteric water soluble color-fixing agent is suitable for color fixing of direct active dye, and can form cation radical, reactant anion radical, hydrogen bond and some radical capable of increasing the intermolecular force in water solution. It can combine with dye anion and cellulose anion through electrostatic force like cationic color fixing agent, and has active cross-linking radical, structure unit with affinity to dye and molecular weight great enough to form protecting film combining with dye and fiber to close the hydrophilic radical, lower the water solubility of dye molecule and strengthen the force between dye molecule and cellulose molecule simultaneously, so as to raise color fastness in several aspects.

Description

technical field [0001] The invention belongs to the category of printing and dyeing auxiliaries, specifically an amphoteric water-soluble color-fixing agent and its application, which can be used for color-fixing of cotton fabrics dyed with direct and reactive dyes. Background technique [0002] Direct and reactive dyes have been widely used in the dyeing of cotton fabrics due to their bright color, complete chromatogram, relatively low cost and convenient use. However, due to the chemical structure of direct dyes, most of them have hydrophilic sulfonic acid groups and carboxylic acid groups, which have strong hydrophilicity and are only combined with fibers through hydrogen bonds and Van der Waals forces, so the wet fastness is low and the color fades , Staining phenomenon is also very serious. Although reactive dyes can form covalent bonds with fibers, the stability of many dyes and fibers is not high. For example, some types of reactive dyes are not resistant to acids, a...

AI Technical Summary

Problems solved by technology

The currently used cationic color-fixing agents either have too large a color-fixing agent molecule and poor diffusion performance, making it difficult to penetrate into the interior of the fiber, or the color-fixing agent molecule is too small, the color lake is not well formed, and the film-forming property is poor, so it cannot form a highly diversified Cross-linking system, so it can't improve the wet rubbing fastness very well