Preparation of Aqueous Nanodispersions of Disperse Dye by High‐Gravity Technology and Spray Drying

Abstract

Disperse dyes are poorly water‐soluble and difficult to stably disperse in an aqueous medium, which greatly limits their application in dyeing synthetic fibers. Micronization can solve this problem. Herein, a facile way to prepare stable aqueous nanodispersions of disperse dye (C.I. disperse yellow 54) is presented by combining high‐gravity antisolvent precipitation in a rotating packed bed (RPB) with spray drying. The as‐prepared product had an average particle size of 120 nm, which could be readily redispersed in water. Compared with raw dye, the wettability and dispersibility of disperse dye nanoparticles were remarkably improved. Furthermore, the dyeing properties of the nanodispersions were obviously better than those of the commercial dye, which was micronized by ball milling.

Novel carboxylate comb‐like dispersant used in disperse dyes

“…9 The ultimate goal is to obtain dyes with smaller particle size and to improve the dyeing rate of disperse dyes on the fiber. 10,11 Dispersants play an important role in the stability of disperse dyes. The dispersant can be adsorbed on the surface of the dye, resulting in steric hindrance between dye particles and effectively preventing the aggregation of dye particles.…”