KINETICS OF THE DYEING PROCESS OF BLEND POLYPROPYLENE/POLYESTER FIBRES WITH DISPERSE DYES

摘要

The dyeing of unmodified polypropylene (PP) fibres by the exhaustion method is characterized by the low affinity of dyes to the PP and the low colour parameters (low colour fastness, low washing and dry-cleaning fastnesses) of the dyed fibres. The preparation of blend polypropylene/ polyester (PP/PES) fibres is interesting from the point of view of the dyeability of these fibres in the bath. A polyester additive in the PP matrix is able to fix the dispersed dyes and increase the take-up of the dye from the bath. This paper presents the effect of two polyesters (polyethylene terephtalate - PET - and polybuthylene terephtalate - PBT) on the kinetics of dyeing blend PP/ PES fibres with C.I. Disperse Red 86 dispersed dye. The dye uptake, dyeing rate constants, diffusion coefficients and activation energy of the dyeing of blend PP/PES fibres are defined.