The Saturation Values, Rates of Dyeing, Rates of Diffusion, and Migration of Disperse Dyes on Heat‐set Polyester Fibres*

Abstract

Studies have been made of the dependence of saturation limits, rates of diffusion, rates of dyeing, and migration properties of a number of disperse dyes on polyester fibres upon the temperature at which the fibres have been heat‐set. Use of pure, crystalline dyes was found to give erratic results and therefore ultra‐dispersed commercial dyes were used in the investigation. The saturation limit and the average diffusion coefficient showed a minimum at a particular heat‐setting temperature. Values were calculated for heat of dyeing, heat of solution, and entropy change in dyeing; these values tended to a maximum or minimum for fibre set at 150C. The findings suggest that the minimum tinctorial yields obtained at such temperatures are due to (a) increasing transformation of the fibre structure on heat setting and (b) preferential loosening of unset fibre by swelling agents in a heated medium. Degree of setting was found to have virtually no influence on migration. The causes of unlevel dyeings are discussed.

Equilibrium Study on the Disperse Dyeing of Polyester Textile in Supercritical Carbon Dioxide

“…To get a clear impression for the dyeing conditions, the dyeing pressures are also given in the tables. The saturation coloration of Disperse Orange 13 in scCO 2 at 378K (105°C) and 550 kg/m 3 is 2.1 mass percent, close to the value reported in literature for aqueous dyeing at 100°C (2.0 mass percent) [17].…”

The Structural Causes of Variations in Dyeing Properties of Terylene Yarn Subjected to Dry and Wet Heat

“…they were a measure of the rate of uptake. Merian et al (4), however, demonstrated that similar effects could be found when the equilibrium absorption values were considered. These authors also confirmed that other indications of the rate of dyeing, e.g.…”

Benzophenone based photostable fluorescent monoazo disperse dyes: Synthesis, AIE, viscosity, UPF and TD-DFT study

“…Dyes on applying to acrylic dyeing showed similar observations as that on nylon (Table 3c). spectra of 4a, 4b, 4c and 5a, 5b, 5c dyes in THF-H 2 O mixtures with different water fractions (5 μM) On the other hand, dyes bond strongly to PET and are slightly affected by UV radiations [67,68]. Hence, PET is more suitable than nylon for the dyes under investigations.…”