Co-bath hot-batch dyeing of cotton fibers with dopamine and CI reactive red 239

Abstract

Polydopamine polymerization is one of the simplest methods for the functional modification of material surfaces. Because of the high requirements for rubbing and washing color fastness of textile and clothes fabrics during taking, the polydopamine on the fabric surface is a porous, loose, and disordered structure that cannot meet the color fastness requirements. To solve the above problems, we use a hot pad-batch treatment process of dopamine and CI reactive red 239 dye (RR239) that induces the orderly polymerization and growth of dopamine to prepare smooth and orderly polydopamine-modified and dyed cotton fabrics. In this way, the fastness of color is satisfied, and the color of the polydopamine-modified fabric can be enriched. In this paper, we compared the effects of three modification processes on the surface morphology of fibers with cotton fabrics as substrates, investigated the results on the dyeing properties of cotton fibers in the co-presence of dopamine/RR239, explored the role of calcium (Ca2+) ions in the dyeing process, and the Fourier transform infrared and X-ray photoelectron spectrometer spectra of polydopamine-modified dyed cotton fibers were tested and the mechanism of cotton fiber modification and dyeing was elaborated. The results showed that the hot pad-batch dyeing process with the simultaneous presence of dopamine and reactive dyestuff could improve the polymerization and covalent cross-linking of dopamine, and increase the reaction of reactive dyestuff with fiber fixation. Due to the strong fabric extrusion, the polydopamine is an ordered and smooth structure, with excellent color fastness.