Reactive dye for dyeing nylon and preparation method thereof

Abstract

The invention relates to a reactive dye for dyeing nylon and a preparation method thereof. The dye has the following structural formula (I). The preparation method for the dye comprises the following steps: (a) adding hydrochloric acid solution and sodium nitrite solution into meta-nitroaniline or p-nitroaniline; (b) dripping H acid into the solution of the step (a); (c) dissolving 2,5-dimethoxy meta-ester into water; (d) adding the solution obtained in the step (c) into cyanuric chloride suspension to perform reaction, and adding 2,5-diaminophenylsulfonic acid into the solution after the reaction is finished; (e) adding the hydrochloric acid solution into the solution of the step (d), and then adding sodium nitrite solution into the solution; (f) dripping the solution of the step (e) into the solution of the step (b); and (g) converting beta-ethyl sulfone sulfate of the coupling solution of the step (f) into vinyl sulfone under the alkali condition so as to form a compound of the structural formula (I).

Description

technical field The invention relates to a dye and a preparation method thereof, in particular to a reactive navy blue dye and a preparation method thereof. Background technique The dyes generally used in the dyeing of nylon fabrics are weak acid dyes and metal complex dyes. The fabrics dyed by weak acid dyes have poor fastness and not bright shade, especially the pollution of heavy metals in the manufacturing process of metal complex dyes and the pollution during dyeing, as well as the damage of dyed nylon fabrics to human skin. Due to environmental and ecological constraints, the requirements for dyeing rate, color fixing rate and dyeing wastewater are getting higher and higher. The development of navy blue reactive nylon dyes has always been a hot spot in the dye industry, because navy blue is the most used in all shades and is the main component of black spelling. The invention provides a reactive navy blue dye suitable for nylon dyeing, which solves the technical prob...

AI Technical Summary

Problems solved by technology

Because the fabrics dyed by weak acid dyes have poor fastness and not bright shade, especially the pollution of heavy metals in the manufacturing process of metal complex dyes and the pollution during dyeing, and the damage of dyed nylon fabrics to human skin

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