Optimalni pogoji barvanja bombaža z naravnim barvilom kurkume

Namen diplomske naloge je bil pobarvati bombaž z barvilom kurkume pri različnih pogojih. Kemično beljena tkanina 100 % bombaža je bila barvana s kurkuminom pri različnih časih (10, 20, 30, 40, 50 in 60 minut) in različnih temperaturah (40, 60 in 80 °C). Pobarvanim vzorcem so bile določene barvne lastnosti (CIE L*a*b* in K/S) z merjenjem na refleksijskem spektrofotometru Spectraflash 600 Plus. Izdelana je bila umeritvena krivulja, iz katere se je izračunalo izčrpanje barvila na substrat. S pomočjo UV/Vis spektrometrije se je izmerila tudi prepustnost tkanine na ultravijolične žarke. Pobarvanim vzorcem je bila določena tudi obstojnost na večkratno pranje. Stopnja izčrpanja barvila je bila največja pri najnižji temperaturi barvanja (40 °C). CIE L*a*b* vrednosti kažejo, da so se vzorci, ki so bili barvani pri višjih temperaturah, obarvali temneje. Vrednosti K/S vzorcev, ki so se barvali pri različnih temperaturah, so bile podobne, kljub temu je bila najvišja vrednost K/S določena na vzorcu, barvanem pri 80 °C. Rezultati kažejo na splošno slabo obstojnost na pranje. Malce boljšo obstojnost imajo vzorci, ki so barvani pri višji temperaturi. Rezultati ultravijoličnega zaščitnega faktorja (UZF) kažejo, da so vrednosti najvišje na vzorcu barvanem pri 80 °C (UZF = 27,93). Vrednosti UZF so se po pranju znižale za približno polovico. The purpose of diploma work was to dye cotton with curcuma dyestuff at different conditions. Chemically bleached 100 % cotton fabric was dyed with curcumin at different times (10, 20, 30, 40, 50 and 60 minutes) and different temperatures (40, 60 and 80 &#186 C). The colour of dyed samples was determined by colour measurements (CIE L*a*b* and K/S) using a reflectance spectrophotometer Spectraflash 600 Plus. The exhaustion of the dye from the dyebath was determined by using the calibration curve. The transmittance of ultraviolet radiation of dyed samples was measured using UV/Vis spectrometry. Dyed samples were also analysed for their wash fastness. The dye exhaustion was the highest for dyeing at the lowest temperature (40 &#186 C). The CIE L*a*b* values indicate that the samples that were dyed at higher temperatures were darker. K/S values were similar for all samples, however the highest K/S value was determined for a sample dyed at 80 &#186 C. In general, dyed samples had poor wash fastness, although slightly better fastness was determined for the samples dyed at the higher temperature. The results of ultraviolet protection factor (UPF) show that the highest value was determined for the sample dyed at 80 &#186 C (UZF = 27.93). The values of UPF decreased by half after washing.