Dyeing and Mechanical Properties of Cotton Fabrics Treated with Sodium Hydroxide/Liquid Ammonia and Liquid Ammonia/Sodium Hydroxide

摘要

Desized and scoured cotton fabric is treated in a two-step process with sodium hydroxide/liquid ammonia andliquid ammonia/sodium hydroxide to investigate the effect of the treatment sequence. Crytallinity, moisture regain, water absorbency, dyeability, and DES mechanical properties aremeasured. Despite a considerable decrease in crystalinity with both treatments, water absorbency decreases with NaOH/NH_3 and increases with NH_3/NaOH compared with the untreated fabric. Furthermore, the NaOH/NH_3 treatment decreases the early dyeing rate with CI Direct Blue 1, whereas the NH_3/NaOH treatment increases the rate remarkably compared to the untreated fabric. Nevertheles, saturation dye uptake with the same dye increases with both treatments compared with the untreated.