Method for improving color fastness of acid fluorescent dyes

Abstract

The invention provides a method for improving the color fastness of acid fluorescent dyes. The method includes the following steps: (1) a fabric dyed with the acid fluorescent dyes is provided; (2) first-time color fixing processing is carried out on the dyed fabric with an acid dye-fixing agent; (3) second-time color fixing processing is carried out on the dyed fabric with the acid dye-fixing agent. The method has the advantages that all steps are executed under the acid conditions, and two times of color fixing are continuously carried out with the acid dye-fixing agent. The dyes and the fabric can be bridged through the acid dye-fixing agent to form a compound; in other words, the acid dye-fixing agent can be in cross-linking reaction with -NH2 on the fabric while being bonded with dye molecules, cross-linking membrane formation can be carried out on the acid dye-fixing agent to form the high diversification cross-linked polymeric membrane of a cubic net structure, and the surface of the fabric is covered with the polymeric membrane, so that the dyes and the fabric are combined together more tightly and firmly, the dyes are effectively prevented from dropping from the fabric, and the color fastness of the acid fluorescent dyes is improved.

Description

technical field [0001] The invention relates to the field of printing and dyeing, in particular to a method for improving the color fastness of acid fluorescent dyes. Background technique [0002] Fluorescent dyes for textiles are widely used. They are often used in the professional attire of traffic police and sanitation workers to play a warning role. They are also used in textiles such as sportswear, shoes and hats, which can improve the aesthetic value of textiles. Fluorescent dye refers to a substance that can emit another wavelength greater than the absorbed light wave after absorbing a certain wavelength of light. It is a functional dye that not only has the coloring characteristics of conventional dyes, but also emits fluorescence. Saturation and vividness are enhanced. [0003] Acid fluorescent dyes and nylon fibers are mainly bonded by ionic bonds, van der Waals forces and hydrogen bonds. Due to weak bonding forces, the color fastness is poor and fading is easy to...

AI Technical Summary

Problems solved by technology

[0003] Acid fluorescent dyes and nylon fibers are mainly combined by ionic bonds, van der Waals forces and hydrogen bonds. Due to the weak bonding force, the color fastness is poor, and it is easy to fade, which seriously affects the wearability and aesthetics of textiles.

At the same time, the structure of acid fluorescent dyes is relatively simple, the molecular weight is small, and it contains a large number of water-soluble groups such as sulfonic acid groups and carboxyl groups, resulting in poor wet fastness.

Using the color fastness improvement process of conventional acid dyes to act on acid fluorescent dyes, it is difficult to improve the color fastness

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