Study of the Disperse Dyeing Properties of Low-Temperature Dyeable Polyesteramide Fibre

Abstract

Polyethylene terephthalate (PET) is the most important synthetic fibre, and is widely used in the textile industry. However, the disperse dyeing of PET fibre must be carried out at a high temperature and under high pressure. This leads to high energy consumption and damage to the wool in a PET/wool blend. Some copolyesters and novel polyesters that can be dyed under normal pressure have proven to be good alternatives to PET. In this work, the low-temperature dyeable polyesteramide fibre was used, and its disperse dyeing properties were studied in terms of adsorption isotherms, the temperature-dependence of uptake, uptake rate, migration ability, building-up property, and colour fastness of disperse dyes. The adsorption isotherms of disperse dyes on polyesteramide fibre followed the Nernst adsorption model. Disperse dyes exhibited high exhaustion at 100 °C, indicating the good dyeability of polyesteramide fibre under atmospheric pressure. The uptake of dyes by polyesteramide fibre was considerably faster than that of PET fibre, while the majority of dye uptake occurred in the temperature range of 70 to 90 °C. Azo disperse dyes exhibited higher adsorption saturation and better a building-up property than anthraquinone dyes. Disperse dyes had a good migration ability on polyesteramide fibre, and the colour fastness of the dyed polyesteramide fabrics was also satisfactory.

Keywords

• dyeing under normal pressure
• partition
• adsorption
• dyeing rates
• energy saving