Reactive navy blue dyestuff for nylon dyeing

Abstract

The invention relates to a reactive navy blue dyestuff for nylon dyeing, which has a structural formula (I) and is prepared by a method comprising the following steps of: (a) adding hydrochloric acid solution and solution of sodium nitrite into para(meta)-nitroaniline; (b) adding H acid into the solution of the step (a); (c) dissolving cresidine para-ester in water; (d) adding the solution obtained in the step (c) into aqueous solution of cyanuric chloride, and adding para-phenylenediamine into the mixture after reaction; (e) adding the hydrochloric acid solution into the solution of the step(d), and then adding the solution of the sodium nitrite into the mixture; (f) dropping the solution of the step (e) into the solution of the step (b); and (g) converting beta-sulfate ethyl sulfone ofan alkaline coupling fluid obtained in the step (f) into vinyl sulfone groups under an alkaline condition so as to prepare the 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 i...

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