Reactive chitosan quaternary ammonium salt, and preparation method and application thereof

Abstract

The invention relates to a reactive chitosan quaternary ammonium salt, and a preparation method and application thereof. The preparation method comprises the following steps: carrying out Friedel-Crafts reaction on chitosan and 2,3-epoxy propyl-trimethyl ammonium chloride to generate N-2-hydroxypropyltrimethyl ammonium chloride chitosan, and carrying out substitution reaction on the N-2-hydroxypropyltrimethyl ammonium chloride chitosan and a compound to generate the reactive chitosan quaternary ammonium salt. The reactive chitosan quaternary ammonium salt is an aid for reactive dye cotton fabric salt-free dyeing, is soluble in water, and has the advantages of no toxic or side effect and favorable environment friendliness. When being used for reactive dye salt-free dyeing of cotton fabrics, the reactive chitosan quaternary ammonium salt has favorable dyeing effects, reduces the environmental pollution of salts in wastewater, and greatly lowers the dye printing production cost. When the reactive chitosan quaternary ammonium salt is used in the dyeing process to obtain the cotton fabric, the dye-uptake rate of the reactive dye is 70-85%. The fixation rate is 47-55%, the dry fastness to rubbing is greater than Grade 4, and the wet fastness to rubbing is greater than Grade 3.

Description

technical field [0001] The invention belongs to the technical field of textile dyeing auxiliaries, relates to a textile auxiliaries and its preparation method and application, in particular to an auxiliaries used for dyeing cotton fabrics with reactive dyes without salt—reactive chitosan quaternary ammonium salt and its Preparation methods and applications. Background technique [0002] Reactive dyes are easy to dye, low in price, bright in color, complete in color spectrum, and good in level dyeing. In today's textile production, reactive dyes are used as an important dye for dyeing cotton fabrics. However, the most prominent problem in the dyeing process of reactive dyes is the low color fixation rate. In the traditional dyeing process of cotton fiber, in order to improve its dyeing rate, a large amount of inorganic salts need to be added. However, the addition of a large amount of inorganic salts not only increases the cost, but also causes serious environmental polluti...

AI Technical Summary

Problems solved by technology

Such as: 1) Small molecular compounds, cotton fibers can significantly improve the binding ability to anionic dyes after being treated with small molecular modifiers, such modifiers include epoxy nitrogen-containing compounds, azetidine chloride, trichloride Azine-type quaternary ammonium compounds, etc., but there is poor hydrophilicity to cotton fabrics, and the dyeing rate of reactive dyes is limited. In addition, there are certain toxic and side effects, and the defects such as not easy to biodegrade; 2) crosslinking agent, synthetic The molecule of salt-free dyeing cross-linking agent contains reactive or active groups. During the dyeing process, the cross-linking agent forms cross-linking covalent bonds with dyes and fibers, which improves the directness and color fastness of fibers, and can also interact with hydrolysis dye crosslinking

Usually, most of these cross-linking salt-free dyeing auxiliaries contain formaldehyde. Although the reactivity is good, they contain toxic substances and are not environmentally friendly; Contains N-methylol, which will still decompose and release formaldehyde under high temperature conditions

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