Dyeing of Lyocell Fabrics with Pigment Dispersion Systems

Abstract

Lyocell fabrics modified by cationic reagent were dyed with conventional and nanoscale pigment dispersions respectively. The color yield and fastness properties were measured. It is found that the color yield and fastness properties of the dyed lyocell fabrics are influenced by the cationic reagent concentration, the cationization pH, time, and temperature. It is also found that the nanoscale pigment system can give the lyocell fabric a higher K/S value but with lower rub and wash fastness. The wet abrasion time, which is used to indicate the fibrillation tendency of lyocell fabrics, was also measured after the cationization and pigment dyeing. The results show that the multifunctional cationic reagent and the pigment on the lyocell surface could increase the wet abrasion time but by different mechanisms.

Keywords:

• Color yield
• fastness
• fibrillation
• lyocell
• pigment
• wet abrasion time

Notes

^a 7% owf of HYM; 90°C for 30 minutes; 1% owf of conventional pigment dispersion.

^a 7% owf of HYM; pH 11; 1% owf of conventional pigment dispersion.

^a 90°C for 30 minutes; pH 11; 1% owf of conventional pigment dispersion.

^a 7% owf of HYM; 90°C for 30 minutes; pH 11.

^a 7% owf of HYM; 90°C for 30 minutes; pH 11.

^a 7% owf of HYM, 90°C for 30 minutes; pH 11; 1% owf of pigment dispersion.

^b C.P. = Conventional pigment dispersion.

^c N.P. = Nanoscale pigment dispersion.