Preparation method and product of sulphur black dye

Abstract

The invention discloses a preparation method of a sulphur black dye. The method comprises the following steps: adding a sulphur black intermediate filter cake in water, heating to 90-100 DEG C while stirring, and adding the mixture in a sodium sulfide or sodium sulfide solution; then pulping for 30-60 minutes, adding a dispersant, and stirring for 5-30 minutes; and finally drying to obtain the sulphur black dye. The invention also discloses the sulphur black dye prepared by the method. By adding the dispersant in the dye, the strike rate of sulphur black on the cotton fabric and the cotton blended fabric can be increased, on the one hand, the dosage of the sulphur black can be reduced in the dyeing process, on the other hand, the amount of pollutants in printing and dyeing wastewater can be reduced, the treatment difficulty and environmental pollution of the printing and dyeing wastewater can be lowered, and the economic and environmental benefits are quite obvious.

Description

technical field [0001] The invention belongs to the technical field of fine chemical industry sulfur dyes, and in particular relates to a preparation method and products of sulfur black dyes. Background technique [0002] Sulfur dyes are dyes produced by the interaction of certain organic aromatic compounds with sulfur or sodium polysulfide. Sulfur dyes are insoluble in water, and need to be reduced to soluble leucosome sodium salt with sodium sulfide during dyeing. Insoluble dyes are fixed on the fibers. [0003] The raw materials and production process of sulfur dyes are relatively simple, the cost is low, the raw materials are simple and easy to obtain, and the fastness to washing and light is good. Therefore, the demand for sulfur dyes is very large, especially black and blue dyes in cotton. It is used in a large amount in the dyeing of products, and it is a variety with a large output in the dye industry. It is a traditional dye in my country. Sulfur black not only has...

AI Technical Summary

Problems solved by technology

When the traditional sulfur black dye is used, it is generally used to add water and sodium sulfide to the intermediate filter cake of sulfur black obtained after oxidation, filtration, and water washing, heat up, adjust the filter cake into a slurry, and then obtain sulfur black by drum drying or spray drying. However, in the dyeing process of sulfur black dyes prepared by these methods, the dyeing rate is low and the dyeing performance is not good.

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