20.500.12556/RUL-181 Preprečevanje sivenja furfuriliranega in acetiliranega lesa diplomsko delo (univerzitetni študij) Prevention of greying of furfurylated and acetylated wood graduation thesis (university studies) Raziskovali smo možnosti preprečevanja sivenja različnih tipov furfuriliranega in acetiliranega lesa s premaznimi sistemi, ki so vsebovali različna UV zaščitna sredstva. Proučili smo UV stabilnost premazanega in nepremazanega lesa s komercialnima imenoma Kebony (bukev, javor, SYP) in Biorez (SYP) ter acetiliranega lesa Accoya radiata (Pinus radiata), oprijemnost akrilnega premaznega sistema po 9 tedenski izpostavitvi umetnemu pospešenemu staranju ter vplive različnih UV zaščitnih sredstev nanjo. Za eksperiment smo posebej formulirali premaz na osnovi vodne akrilne disperzije (40 % suhe snovi), v katerega smo vmešali 4 različne tipe UV zaščitnih sredstev. Lastnosti lesa Biorez so se izkazale za primerljive z lastnostmi lesa Kebony. Sprememba barve nepremazanega acetiliranega lesa je bila najmanjša in v drugi polovici eksperimenta konstantna, vendar pa na osnovi vseh preučenih lastnosti za najboljšo izbiro veljata Kebony SYP in Biorez SYP. Kar se tiče UV zaščitnih sredstev, kaže najboljše rezultate kombinacija Tinuvin + HALS, se posebej na Biorez SYP-u z ozirom na oprijemnost filma. Tudi glede razpok v filmu so bili rezultati zelo dobri. Število vseh vzorcev je bilo 45 in le na 3 smo našli razpoke (2 vzorca merantija). Kot odličen stranski rezultat pri raziskavah se je pokazala oprijemnost filma na referenčnem sistemu melamin-breza. V prihodnje bi bilo smotrno opraviti raziskave še v smeri znižanja barvnih sprememb. The aim of this research was to investigate UV-stability of coated and uncoated Kebony wood, Biorez (furfurylated beech, maple and southern yellow pine - SYP) and Accoya radiata (acetylated Pinus radiata), wet adhesion of acrylic lacquering systems after UV treatment, and influence of different UVprotective additives on the performance of acrylic lacquering systems, including adhesion. The UV-stability was tested on self-made transparent coating systems in 9 weeks of accelerated weathering test. Properties of Biorez treated wood turned out to be comparable to the Kebony ones. Changing of colour of uncoated Accoya radiata was the lowest and constant in the second half of test, but overall, as the best choice the experiment confirmed Kebony SYP and Biorez SYP. Concerning UV additives, Tinuvin + HALS combination showed the best results, especially at Biorez SYP in relation to wet adhesion test. As regard cracking of coatings, the results were very good: from total number of 45 pieces tested the cracks were found on just 3 samples of reference wood species (meranti). Referential melamine birch showed a great side result at wet adhesion test. In future, further research could be done in direction of decreasing colour changing. les modificiran les furfurilni alkohol furfuriliranje acetiliranje sivenje wood modified wood furfuryl alcohol furfurylation acetylation greying true false false [I. Mohorič] Slovenski jezik Angleški jezik Diplomsko delo 2014-07-11 12:24:29 2014-07-11 12:24:29 2022-07-11 10:08:46 0000-00-00 00:00:00 2007 0 Ljubljana 0 IX, 46 f., [7 f. pril.] 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*829.1 1482121 dn_mohoric_iztok.pdf dn_mohoric_iztok.pdf 1 C69275B07A8E66FB82F0C573CBF15008 d4387540638903bf8db2e5f18aa1fdd477841cf51afeab852bfe5b8cd7a6cf27 5770a1d6-a1b9-11eb-a523-00155dcfd717 20.500.12556/rul/e0aeb388-0389-4972-9f40-4c7117aec24b https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132220 Biotehniška fakulteta 0 0 0