Preparation method of black waterborne polyurethane dye

Abstract

The invention discloses a preparation method of a black waterborne polyurethane dye based on black chromophores in diols. The preparation method is characterized by comprising the following steps of enabling activated hydrogen in amino groups or hydroxyls contained in molecular structures of three black dyes to react with chloroethanol to obtain three black diols; then, combining the black diols with micromolecular diols, and partially or completely substituting the micromolecular diols; and next, reacting with diisocyanate, macromolecular diols and a hydrophilic chain extender to obtain the black waterborne polyurethane dye. By using the method, other micromolecular chain extenders can be partially or completely substituted with the black diols, so that solid content of an emulsion is wide in distribution range and adjustable, and the content of the black chromophores in a molecular chain of polyurethane can be controlled as required; and meanwhile, the black chromophores enter the molecular chain of the dye in a chemical bonding way, so that the characteristics of high temperature resistance, solvent resistance and migration resistance of a macromolecular dye can be sufficiently exerted, and the dye is good in durability, high in color fastness and good in safety.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane, and in particular relates to the synthesis of diols with black chromophores and a preparation method for using the diols to partially or completely replace common diols to form black water-based polyurethane dyes. Background technique [0002] In textile, printing, printing and dyeing, leather and other fields, small molecular black dyes are widely used as one of the most used dyes. Since the general small molecular dyes are usually fixed on the dyed material through ionic bonds, hydrogen bonds, van der Waals force, etc., the binding force with the dyed material is not strong, and it is easy to migrate to the material during placement, washing, dry cleaning, use, etc. surface, causing constant peeling and fading. In addition, although the azo-based black dyes derived from benzidine have the advantages of good blackness, high dyeing rate and color fixation rate, they will release...

AI Technical Summary

Problems solved by technology

China's "Functional Materials" (2011, Volume 42, No. 2, Page 351-354) reported that on the basis of using the active dihydroxyl group contained in the acid medium black T (EBT) structure, it can be used as a chain extender. The chromophore was introduced into the polyurethane molecular chain to prepare a TDI black water-based polyurethane dye (EBT-PU). However, due to the low activity of the phenolic hydroxyl group, the amount of the chromophore incorporated was limited and uncontrollable.

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