The modification of the polyester knitted fabric for more economic dyeing

Abstract

This article discusses the process of modification of the polyester knitted fabric as a prerequisite for successful dyeing at a lower temperature and without the presence of the carrier. The processing preceding dyeing, alkali-alcohol hydrolysis with ultrasound, changes the surface morphology causing the peeling and cracks on the surface of polyester fibres of the knitted fabric, decreases the mass and thickness of the knitted fabric, improves the sorption features, capillarity and absorption of water and soaking. The process of dyeing of the modified polyester knitted fabric in the presence of ultrasound at the lower temperature gives much better results than dyeing without ultrasound, and it is very close to the standard process of dyeing of a raw sample at the higher temperature. By increasing the concentration, the level of dye exhaustion per mass unit of the knitted fabric decreases. At the highest applied dye concentrations and the longest dyeing, the biggest dye adsorption happens.

U ovom članku se govori o procesu modifikacije poliestarske pletenine kao preduslova za uspešno bojenje na nižim temperaturama i bez prisustva kerijera. Prethodna obrada pre bojenja, alkalno-alkoholna hidroliza sa ultrazvukom, menja površinsku morfologiju, izaziva piling i pukotine na površini poliestarskih vlakana pletenine, smanjuje masu i debljinu, poboljšava svojstva sorpcije, kapilarnost i apsorpciju vode kao i kvašenje pletenine. Proces bojenja modifikovane poliesterske pletenine u prisustvu ultrazvuka na nižim temperaturama daje mnogo bolje rezultate od bojenja bez ultrazvuka i veoma je blizu standardnom procesu bojenja sirovog uzorka na višoj temperaturi. Povećanjem koncentracije smanjuje se iscrpljenje boje po jedinici mase pletenine. Kod najviše primenjene koncentracije boje i najdužeg bojenja, dešava se najveća adsorpcija boje.