Vpliv optičnega belilnega sredstva na fotoobarvanje bombažne tkanine, barvane z mikrokapsulami fotokromnega barvila

Krkoč, Vida (author), Kert, Mateja (mentor)

V raziskavi je bil preučevan vpliv dodatka različnih koncentracij optičnega belilnega sredstva (Ultraphor CK) na fotoobarvanje bombažne tkanine, na katero smo po impregnirnem postopku nanesli mikrokapsule fotokromnega barvila (Itofinish UV blue) in vezivo (Itobinder AG). Slednji je bil dodan v kopel za boljše vezanje mikrokapsul na tkanino. Po impregnaciji je sledilo sušenje in kondenzacija vzorcev. Na vzorcih so bile izmerjene ploščinska masa, togost, pretržna sila in raztezek, zračna prepustnost, barvna obstojnost na drgnjenje, barvna obstojnost na gospodinjsko pranje ter barvna obstojnost na svetlobi. Barvo vzorcev pred enominutnim osvetljevanjem z UV-sijalko in po njem smo določili z refleksijskim spektrofotometrom. V primerjavi z nepobarvano tkanino se je pobarvanim tkaninam, ne glede na sestavo barvalne kopeli, povečala ploščinska masa, togost ter pretržna sila in raztezek, medtem ko se je zračna prepustnost zmanjšala. Naraščanje koncentracije optičnega belilnega sredstva v impregnirni kopeli je imelo za posledico manjše vezanje veziva na bombažno tkanino, v katerem so vključene mikrokapsule fotokromnega barvila in s tem znižanje ploščinske mase tkanine ter povečanje zračne prepustnosti tkanine. Pobarvani vzorci so bolj barvno obstojni na mokro kot na suho drgnjenje. Barvna obstojnost pobarvanih vzorcev na pranje se zmanjšuje z naraščajočim številom ciklov pranja. Dodatek veziva v impregnirno kopel omogoči vezanje mikrokapsul fotokromnega barvila na bombažno tkanino. Optično belilno sredstvo zmanjša fotoobarvanje bombažne tkanine, impregnirane z mikrokapsulami fotokromnega barvila in pri daljših časih osvetljevanja (daljših od 12 ur) vzorcev v Xenotest aparatu izboljša barvno obstojnost pobarvanih vzorcev na svetlobi.

• Language: Slovenian
• Keywords: fotoobarvanje, mikrokapsule fotokromnega barvila, bombaž, optično belilno sredstvo.
• Work type: Bachelor thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2017
• PID: 20.500.12556/RUL-95358
• Publication date in RUL: 20.09.2017

KRKOČ, Vida, 2017, Vpliv optičnega belilnega sredstva na fotoobarvanje bombažne tkanine, barvane z mikrokapsulami fotokromnega barvila [online]. Bachelor’s thesis. [Accessed 21 June 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=95358

Secondary language

• Language: English
• Title: The effect of optical brightening agent on the photocolouration of cotton fabric, dyed with microencapsulated photochromic dye

Abstract

In the research the impact of different concentrations of optical brightening agent (Ultraphor CK) on the photocolouration of woven cotton fabric, dyed by pad-dry-cure method with the commercial microencapsulated photochromic dye (Itofinish UV blue) and binder (Itobinder AG) was studied. The letter was added to improve binding of microcapsules onto fabric. After padding, followed the drying and curing of the samples. The mass per surface area, stiffness, breaking strength and elongation, air permeability, colour fastness to rubbing, colour fastness to domestic washing and colour fastness to light was measured. The colour of the samples before and after the one-minute illumination with UV light source was spectrophotometrically evaluated by the use of reflectance spectrophotometer. Higher values of mass per unit area, stiffness, breaking strength and elongation were obtained on dyed samples regardless of the dyebath composition in comparison with the undyed cotton fabric. The air permeability was lower on dyed samples. The increase of optical brightening agent concentration in the dyebath resulted in lower embedment of microencapsulated photochromic dye onto cotton fabric and thus a reduction of the mass per unit area and an increase of air permeability of the fabric. The dyed samples have higher colour fastness to wet than to dry rubbing. With the increasing number of washing cycle the colour fastness of dyed samples to domestic washing is decreased. Addition of the binder into the dyebath enable binding of microcapsules of the photochromic dye onto cotton fabric. Optical brightening agent decreases photocolouration of the cotton fabric and therefore increases the colour fastness to light at prolonged exposure (longer than 12 hours) of samples to Xenotest apparatus.

• Keywords: photocolouration, microcapsules of the photochromic dye, cotton, optical brightening agent.