Formaldehyde-free fixing agent for active dye

Abstract

The invention discloses a formaldehyde-free fixing agent for an active dye. The formaldehyde-free fixing agent is prepared by compounding 2 to 4 compounds. The formaldehyde-free fixing agent has reactive functional groups and high cationic property, can effectively improve the dry rubbing fastness, wet rubbing fastness and color fastness to washing of fabrics dyed by the active dye, and has a little influence on the color tone of the fabrics.

Description

technical field [0001] The invention relates to a color-fixing agent, in particular to an formaldehyde-free color-fixing agent for reactive dyes, and belongs to the technical field of synthesis of textile printing and dyeing auxiliaries. Background technique [0002] Cotton textiles are more and more widely used in people's life due to their excellent hygroscopicity and comfort. There are several types of dyes used in dyeing cotton textiles, including reactive, direct, vulcanized, and vulcanized. Among these dyes, reactive dyes have become the most widely used dyes in cotton fabric dyeing because of their advantages such as complete color spectrum, bright color, reasonable price and convenient use. However, after dyeing cotton fabrics with reactive dyes, its color fastness is average, especially the wet rubbing fastness and color fastness to washing after dyeing medium and dark colors are poor. Adsorbed on the fiber surface but not chemically bonded to the fiber, these unb...

AI Technical Summary

Problems solved by technology

The current formaldehyde-free color fixing agent has been widely used in the dyeing of cotton fabrics with reactive dyes, but the wet rubbing fastness and color fastness to washing are not ideal. , the diffusion performance is poor, it is difficult to penetrate into the interior of the fiber and form a lake with the dye, and can only be fixed on the surface of the fiber; the other part is too small because of the molecular weight, although it can enter the interior of the fiber to form a lake with the dye, but due to the small molecular weight As a result, the intermolecular force is small, the color lake formed with the dye is unstable, it is easy to detach from the fiber, and the film-forming property on the fiber surface is poor, and it cannot be highly cross-linked and fixed on the fiber surface

In a word, no formaldehyde-free color fixing agent with too large or too small molecular weight can not improve the wet rubbing fastness and washing fastness of cotton fabrics dyed with reactive dyes.

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