Dyeing of Nylon 6.6 with Polyfunctional Disazo MCT/SES Reactive Disperse dyes derived from Aminothiophene Moiety/1- Aminobenzene-4-Β-Sulphatoethylsulphone

Abstract

Synthesis of a new polyfunctional disazo MCT/SES reactive disperse dyes derived from aminothiophene moiety/1-aminobenzene-4-β-sulphatoethylsulphone is described. These disazo polyfunctional reactive disperse dye based on bis(SES)/MCT reactive system was coupled with 4-aryl-2-aminothiophene derivatives using a simple monoazo SES dye which twice condensed with cyanuric chloride forming the target disazo polyfunctional reactive disperse dye. The synthesized dyes were purified by recrystallization method and the structure was confirmed by TLC, UVVisible, FT-IR, GC-MS, and NMR studies. The dyes were applied to Nylon 6.6 fabrics. Optimum dye exhaustion and fixation were achieved at pH of 8 and temperature of 100 °C. The introduction of two temporarily anionic sulphatoethylsulphone and monochlorotriazine reactive groups into the reactive disperse dye molecule was found to promote the fixation and the buildup. The presence of thiophene moiety resulted in excellent brightness of shade. The results of dyeing on nylon 6.6 indicate that the novel polyfunctional disazo reactive disperse dye shows a higher degree of exhaustion and fixation. All the tested dyed fabrics showed good to moderate light fastness ratings of 4 to 5, and very good fastness to washing and perspiration of 4-5.