Polydimethyldiallylammonium chloride modified color fixing agent and preparation method thereof

Abstract

The invention provides a polydimethyldiallylammonium chloride modified color fixing agent and a preparation method thereof. The preparation method comprises the following steps: (1) adding a chelating agent and deionized water into a reaction kettle, starting agitating, heating for increasing the temperature; (2) when the temperature is increased to 60-80 DEG C, simultaneously dropwise adding dimethyldiallylammonium chloride, unsaturated ester, epoxy compound and initiator solution with the concentration of 1-10% into first to fourth elevated tanks in sequence, wherein the dripping time is controlled in the range of 0.5 to 2 hours, and the dripping temperature is controlled at 65-85 DEG C; and (3) after the dripping is finished, preserving the temperature for continuously reacting for 1 to 5 hours, adding deionized water according to the requirements of products so as to dilute, and evenly agitating to obtain the color fixing agent.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a polydimethyldiallylammonium chloride-modified color-fixing agent and a preparation method thereof. Background technique [0002] Cotton fiber (mainly composed of cellulose) is one of the four major natural fibers (cotton, wool, silk, and hemp). Due to its good hygroscopicity, warmth retention, comfort and soft feel in terms of wearing performance, and Clean health care and degradable recycling and other characteristics, and have been widely used. At present, the dyes used in cotton fiber printing and dyeing include vat dyes, sulfur dyes, direct dyes and reactive dyes. [0003] Reactive dyes have many advantages such as complete chromatogram, bright color, low price and convenient use, and have become the most widely used cotton dyes. However, during the printing and dyeing process, the bonding reaction and hydrolysis reaction between reactive dyes and cellulose fiber...

AI Technical Summary

Problems solved by technology

However, in the printing and dyeing process, the bonding reaction and hydrolysis reaction between reactive dyes and cellulose fibers exist at the same time. The existence of hydrolysis reaction leads to relatively low color fixation rate of reactive dyes, and the wet rubbing fastness of dyed fabrics is especially medium and dark. The wet rubbing fastness of dyed fabrics is low, so the fabrics are also treated with color-fixing agents after dyeing

[0004] In order to solve the problem of poor wet rubbing fastness and washing fastness after dyeing cotton fabrics with reactive dyes, it is most important to vigorously develop and use new reactive dyes with complete chromatograms, reasonable structures, and simple processes that can meet the color fastness requirements. way

Although some imported dyes can meet these characteristics to a certain extent, they are expensive and the fastness of some varieties is not ideal

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