A BLACK ACTIVE DYE AND THE PREPARATION THEREOF

摘要

The present invention provides a black active dye and the preparation thereof. The main raw materials are sodium 2,4-diamino-benzene sulfonate, H acid, 2,3-dibromo-propionyl chloride and dinitroaniline. The product is obtained by condensation, diazotization, coupling and postprocessing. The active black product with high blackness is made by mixing them with suitable amount red or orange dyes. The product can dye without mixing any heavy metal as an auxiliary, and can be used instead of acid medium black to dye pashm or other worsted wool product, and also can dye fibers such as cotton, silk, polyamide and the like. It prevents from producing a printing and dyeing waste water containing heavy metal Cr6+, and facilitates the technical improvement of the printing and dyeing art.