THE DYEABILITY OF BLEND POLYPROPYLENE/POLYESTER FIBRES BY DISPERSE DYES

摘要

The aim of this work was to study the colour properties of polypropylene fibres modified with various types of polyesters (PES). Polypropylene (PP) was modified by polyethylene terephthalate (PET), polybuthylene terephthalate (PBT), poly(trimethylene terephthalate) (PTT) and a polyester blend (PET/PBT/PTT). The fibres were dyed at the temperature of 98℃ (using the classic process for PET fibres) using disperse dyes C. I. Disperse Red 86 and C. I. Disperse Blue 56. The colour properties (total colour difference ΔE, position data of colour coordinates L~*, a~*, b~*) were evaluated using a CIELAB analysis. The affinity of the disperse dyes to the blend PP/PES fibre depends on the content of the various PES component in the blend fibre. The polyester dispersed in the PP matrix positively affects the dye uptake in the exhaust process. The disperse dyes are expected to mainly diffuse into the amorphous regions and at the interface of the fibre blend components. The results obtained indicate the different effects of individual PES on the dyeability of blend PP/PES fibre. Sufficient colour strength of the fibres was achieved for polypropylene modified with PET and PBT.