Surface Trimer Removal of Polyester Fibers by Ozone Treatment

Abstract

The oxidative ozone treatment of poly (ethylene terephthalate) fibers after dyeing was recently proposed as a novel afterclearing method. High fastness properties, energy and time savings, and environmental benefits were reported by the ozone treatment compared to the conventional reduction clearing. This study investigated the efficiency of the ozone treatment afterclearing process on the surface trimer removal of poly(ethylene terephthalate) fibers. Results indicated similar cyclic trimer [(GT)3] removal rates after 1 min ozone treatment when compared to the conventional reduction clearing; the removal rates increased at 3 min ozone treatment time. The migration rate of the cyclic trimers [(GT)3] out of the fibers was also investigated as a function of temperature and a sudden increase was observed after second glass transition temperature of poly (ethylene terephthalate) fibers rather than a linear increase.

Practical realisation of ozone clearing after disperse dyeing of polyester

“…Successful and advantageous ozone treatment trials for the after clearing of disperse dyed polyester have been reported in the literature. These studies report the use of ozone at room temperature for shorter treatment times compared with conventional reduction clearing, with satisfactory colour difference values and wash fastness results for the ozone treatments .The potential benefits of ozone utilisation for the clearing of disperse dyed PET in terms of lower environmental pollution and water, energy, and time savings have been reported .…”

“…Other reductive agents include thiourea dioxide (TUDO), inorganic salts, reducing agents that do not require alkali, and liquid reducing agents . The oxidative clearing of PET with oxidative agents, either hydrogen peroxide or ozone, has also been reported in the literature .…”

“…Ozone is an oxidative gas with a high oxidation potential. Ozone decomposes into secondary oxidants such as OH • , HO 2 • , HO 3 • , and HO 4 • in aqueous media . Successful and advantageous ozone treatment trials for the after clearing of disperse dyed polyester have been reported in the literature.…”

Using Circular Conduits in Ozone Injection

“…Ozone was studied in treatment of wastewater and decolorization of textile wastewater by Poznyak et al (2007), Zhang et al (2007), Selcuk and Meric (2006), Perincek et al (2007), and Eren and Anis (2009). In the literature there is no study identified about ozone injection of circular conduits.…”

A Pilot-Scale Application of Ozone to Bleach Raw Cotton Fabric Using Various Additives

“…The ozonation process has also shown its effectiveness for reduction clearing of polyester fibers (Eren 2007;Eren and Anis 2009). Its success to wash off unfixed reactive dyes cost-effectively from cotton fabrics, without compromising colorfastness properties has been recently reported both on laboratory and pilot scales (Shaikh et al 2010;Shaikh and Ahmad 2013).…”