Low-Salt or Salt-Free Dyeing of Cotton Fibers with Reactive Dyes using Liposomes as Dyeing/Level-Dyeing Promotors

Abstract

The main aim of this investigation was to promote the dyeing and level-dyeing effect of reactive dyes on cotton-fiber dyeing by encapsulating reactive dyes in liposomes as an alternative to sodium chloride. The results obtained indicated that liposomes, especially cationic liposomes, have a remarkable level-dyeing promoting effect on cotton fibers, although the dyeing promoting effect was not as good as that of sodium chloride. The optimum dyeing and level-dyeing effects were achieved at a dye-fixing temperature of 85 °C, sodium carbonate concentration of 10 g/L and dye dosage of 2% (on the basis of oven-dry cotton fibers) when liposomes were used as the dyeing and level-dyeing promoters. The combination of cationic liposomes and sodium chloride can significantly promote both the dyeing and level-dyeing of cotton fibers. These results indicated the potential of cationic liposomes as novel dyeing and level-dyeing promoters or microencapsulated dye wall materials for reactive-dye dyeing applications.

Sustainable dyeing of ramie fiber with ternary reactive dye mixtures in liquid ammonia

“…Since there was no salt added in LA dyeing (as opposed to the water dyeing process), the repulsive force between the cellulosic ramie ber and the anionic reactive dyes was higher and exhibited a large inhibition rule for dye exhaustion. [40][41][42] This implies that the dye adsorption rate in LA was very fast, and comparatively much higher than the aqueous dyeing. Aer 10 and 60 min of LA dyeing and aqueous dyeing with a single dye, the dyed bers were dried and soap-washed.…”

Sustainable and eco-friendly dyeing of traditional grass cloth with a reactive dye in palm oil medium

“…During the dyeing, with an increase in dyeing temperature to the target fixation temperature and dyeing time extension, and under strongly alkaline conditions, the fibre of the grass cloth swelled well, which was beneficial for dye migration from the surface to the interior of fibres. 41 Meanwhile, the strong alkaline conditions were effective not only in swelling gummy materials but also in acting on the sites of cellulosic fibres, gummy materials, and reactive groups of the reactive dye. These benefits and a suitable fixation temperature promoted the covalent bond formation between the dye and the grass cloth, as shown in Fig.…”

Effect of Textile Wastewater Secondary Effluent on UF Membrane Characteristics

“…In addition, the hydrophobic character of PSf allows the adsorption of organic compounds in the polymer matrix of the membrane. The specific adsorption between the membrane and negatively charged reactive dyes used for dyeing in the textile factory where the TWW samples were collected decreased the zeta potential of these membranes, i.e., the membranes became more negative [ 22 , 23 ].…”