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V diplomskem delu je bila proučevana obarvljivost bombažne tkanine z indikatorskim barvilom metiloranž (MO). Barvanje bombažnih tkanin je bilo izvedeno po izčrpalnem postopku barvanja. Barvanje je bilo opravljeno po dveh postopkih, in sicer brez kationske predobdelave in z dodatkom elektrolita ter s kationsko predobdelavo in brez dodatka elektrolita v barvalno kopel. Obarvane tkanine so bile tudi poobdelane s kationskih sredstvom za izboljšanje mokrih obstojnosti obarvanj. Meritve barve na obarvanih tkaninah in koncentracija barvila v barvalni kopeli ob koncu barvanja so bile spektrofotometrično ovrednotene. pH-odzivnost pobarvanih tkanin je bila prav tako izmerjena spektrofotometrično po potopitvi vzorcev v pufrske raztopine različnih vrednosti pH. Na obarvanih tkaninah so bile preizkušane barvne obstojnosti proti gospodinjskemu in poklicnemu pranju, na umetni svetlobi, na vroče likanje in na drgnjenje. Barvne obstojnosti so bile izvedene in ocenjene v skladu s standardi SIST EN ISO. Rezultati raziskave so pokazali, da kationska predobdelava bombažne tkanine bistveno izboljša izčrpanje barvila MO iz barvalne kopeli na bombažno tkanino. Pobarvana tkanina je barvno odzivna na spremembe pH. Barvna obstojnost pobarvanih tkanin pri pranju je slaba, kljub kationski poobdelavi. Pobarvane tkanine so dobro barvno obstojne na vroče likanje ter suho in mokro drgnjenje ter zelo slabo obstojne na svetlobi. In this diploma thesis, the dyeability of cotton woven fabric with the indicator dye methyl orange (MO) was investigated. Dyeing was performed using the conventional exhaust dyeing process. Dyeing of cotton fabric was carried out by two methods, namely, without cationic pre-treatment and with the addition of electrolyte, and with cationic pre-treatment and without the addition of electrolyte in the dyebath. After dyeing, the dyed fabrics were treated with a cationic agent to improve the wet fastness properties of the fabric. The colour of the dyed fabrics and the concentration of the dye in the dyebath before and after dyeing were evaluated spectrophotometrically. The pH sensitivity of the dyed fabrics was also evaluated spectrophotometrically after the dyed fabrics were immersed in the buffer solutions with different pH values. The dyed fabrics were tested for colour fastness to domestic and commercial laundering, to artificial light, to hot pressing and to rubbing. The tests of colour fastness properties and their evaluation were carried out according to SIST EN ISO standards. The results showed that the cationic pre-treatment of the cotton fabric significantly improves the exhaustion of the dye MO onto the cotton fabric. The dyed fabric is sensitive to pH. The wash fastness of the dyed fabric is poor despite the cationic post-treatment. Dyed fabric has good colour fastness to hot pressing, dry rubbing and wet rubbing but very poor lightfastness. |
