High-temperature high-chlorine-resistance reactive red dye for cotton and preparation method thereof

Abstract

The invention discloses a reactive red dye for high-chlorine-resistant cotton at high temperature, which comprises a compound as shown in the structural general formula I. In the structural general formula I, R1 is-H or-AO3H; R < 2 > is-H; X is Cl; and M is Na. The method comprises the following steps: (1) preparing a J acid X-type red reactive dye; and (2) preparing the high-temperature high-chlorine-resistance reactive red dye for cotton. Diethylenetriamine is selected as a connecting group, two J acid monoazo red reactive dyes are connected together to form the final reactive red dye, and diethylenetriamine is not on a J acid monoazo red chromophore through the separation effect of a triazine ring, so that the color performance of the final dye is not influenced. Finally, the aliphatic chain secondary amine group retained in the diethylenetriamine structure in the molecule of the reactive red dye contains lone pair electrons, has high activity, and can preferentially act with available chlorine in an environmental medium, so that a dye color development system and a covalent bond between the dye and the fiber are prevented from being damaged by the available chlorine.

Description

technical field [0001] The invention relates to the technical field of reactive dyes, in particular to a reactive red dye for high-temperature chlorine-resistant cotton and a preparation method thereof. Background technique [0002] Reactive dyes have complete chromatograms and rich varieties, and are widely used in the dye application of cellulose fibers and protein fibers. Due to their molecular structure containing reactive groups, reactive dyes can react with hydroxyl groups on cellulose fibers or protein fibers under alkaline conditions. The amine group on the reactive dye reacts and is covalently bonded to the fiber. Therefore, the wet rubbing fastness of the fiber dyed with reactive dyes is superior. [0003] After dyeing fibers with reactive dyes, the dyed fabrics will fade when immersed in water containing active chlorine. This may be because some parts of the dye (such as -N=) have poor chlorine resistance stability and are easily oxidized by active chlorine. It i...

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Problems solved by technology

[0003] After dyeing fibers with reactive dyes, the dyed fabrics will fade when immersed in water containing active chlorine, which may be because some parts of the dye (such as -N=) have poor chlorine resistance stability and are easily oxidized by active chlorine.

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