20.500.12556/RUL-117568 Kinetika utrjevanja poliestrskega lepila na osnovi utekočinjenega lesa diplomsko delo - visokošolski strokovni študij Kinetics of curing of polyester adhesive based on liquefied wood Proučevali smo kinetiko utrjevanja lepilnih mešanic iz melamin-urea-formaldehidnega lepila (MUF) in poliestrskega lepila na osnovi utekočinjenega lesa (PEST-UL). Pripravili smo lepilne mešanice z različnimi utežnimi deleži MUF in PEST-UL, katerih utrjevanje smo spreminjali z diferenčno dinamično kalorimetrijo (DSC). Vse lepilne mešanice smo segrevali s hitrostjo 10 °C min-1 v temperaturnem območju 25-400 °C. Ugotovili smo, da več kot je MUF lepilu dodanega PEST-UL, višja je temperatura prvega eksotermnega vrha. Z večanjem deleža PEST-UL v MUF lepilni mešanici, od razmerja MUF/PEST-UL = 90/10-50/50, se temperatura prvega eksotermnega vrha konstantno povečuje in sicer od 92,52-98,74 °C; temperatura drugega eksotermnega vrha pa se glede na konstantno povečanje deleža variabilno spreminja in sicer od 292-299 °C. Z DSC metodo smo podrobneje proučili lepilno mešanico MUF/PEST-UL = 70/30 pri 3 različnih hitrostih segrevanja: 5, 10 in 20 °C min-1. Iz simulacije utrjevanja lepilne mešanice pri dinamičnih temperaturnih pogojih z uporabo MFK smo predvideli čase utrjevanja pri dinamičnih temperaturnih pogojih do določene stopnje utrjenosti lepilne mešanice. Thesis studies the curing kinetics of different adhesive mixtures from melamin-urea-formaldehyde adhesive (MUF) and polyester adhesive based on liquefied wood (PEST-UL). We prepared the adhesive mixtures with different proportions of MUF and PEST-UL mixture and noted the difference of differential dynamic calorimetry (DSC). All the adhesive mixtures were then heated with the speed of 10 °C min-1 within the temperature range of 25-400 °C. We found out that more PEST-UL adhesive added to the MUF adhesive increases the temperature of the first exothermic peak. By increasing the percentage of PEST-UL in MUF mixture the temperature of the first exothermic peak is constantly increasing with the ratio of 90/10-50/50 to the temperature of 92,52-98,74 °C, while the temperature of the second exothermic peak considering the constant increase of the proportion changes variably from 292-299 °C. Research also focuses on studying the adhesive mixture MUF/PEST-UL = 70/30 with the DSC method by different heating rate: 5, 10 and 20 °C min-1. By simulating the curing of the adhesive mixture in dynamic temperature conditions using MFK, the curing times at dynamic temperature conditions is attainted until certain degree of cure of adhesive mixture. poliestrsko lepilo utekočinjen les kinetika utrjevanja DSC MFK polyester adhesive liquefied wood curing kinetics DSC MFK true false false [M. Pertnač] Slovenski jezik Angleški jezik Diplomsko delo 2020-07-16 12:12:03 2020-07-16 12:12:07 2022-08-29 03:44:11 0000-00-00 00:00:00 2013 0 Ljubljana 2013 Ljubljana IX, 34 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*824.89:630*813.6 2099081 UNI_Pertnac_Marko_2013.pdf UNI_Pertnac_Marko_2013.pdf 1 C66D3C93669DA2D02EA9B58F98ECCAB3 98dff83c99f429352d8ddf8029a333087bd7c3b9b4a550a1dc4543d6f88f7072 35b88ab1-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=131449 Biotehniška fakulteta 0 0 0