Modelling of Dyeing of Modified Polyester at Lower Temperature by Ultrasound

Abstract

This article discusses the process of polyester dyeing through the modelling process, i.e. the ability of adsorption of dyes for chemically modifi ed polyester fi bres of knitted fabrics in aqueous environment in the presence of ultrasound waves, at lower temperature and without carrier. Previous processing before dyeing, i.e. the alkali-alcohol hydrolysis with ultrasound, changes the surface morphology, decreases the mass and thickness of knitted fabric, improves the sorption features, capillarity and absorption of water, and wetting. The process of dyeing a modifi ed polyester knitted fabric in the presence of ultrasound at lower temperature gives much better results than dyeing without ultrasound and it is very close to the standard process of dyeing a raw sample at higher temperature. By modelling the system, it has been found that the Freundlich non-linear and linear isotherm are the most effi cient in simulating the isothermal adsorption of disperse dye on polyester knitted fabric, whereas Langmuir and Nernst give weaker results.

Modification of polyester fabric by treatment in alkaline solution

“…Biološki tretman celulazama je manje efi kasan za postizanje bilo kakvog poboljšanja termofi ziološkog komfora ispitivanih pletenina. U nedavno objavljenim radovima alkalno-alkoholna hidroliza sa ultrazvukom je proučavana sa aspekta ekonomičnog bojenja poliestarskih pletenina [12,13]. Poliestarska pletenina je obrađivana u alkoholnom reastvoru NaOH uz primenu ultrazvučnih talasa snage 50 W, a zatim bojena disperznom bojom (DR60).…”

“…Predhodna obrada alkalnim rastvorom, usled površinskog razaranja poliestra, smanjuje debljinu pletenine a povećava brzinu kvašenja i kapilarnost [12]. Modeliranjem sistema utvrđeno je da Frojndlihova adsorpcoina izoterma najbolje opisuje adsorpciju disperzne boje na poliestarskom pletivu, dok Lengmirova ili Nernstova izoterma daju slabije rezultate [13].…”