20.500.12556/RUL-158860 Primerjava naravnega in umetnega pospešenega staranja lazurnih premazov diplomsko delo - visokošolski strokovni študij Comparison of natural and artifical accelerated ageing of stains graduation thesis - higher professional studies Za površinsko zaščito lesa, ki je namenjen zunanji uporabi, so se uveljavili lazurni premazi z akrilnim vezivom na vodni osnovi. Izdelki so med uporabo, skupaj s premaznim sistemom, izpostavljen različnim vremenskim vplivom - staranju. Vplive staranja na površinski sistem lahko ugotavljamo tako z naravnim, kot z bistveno hitrejšim umetnim pospešenim staranjem. Da bi ugotovili vplive staranja na lastnosti premazov in med seboj primerjali naravno in umetno pospešeno staranje, smo obema postopkoma staranja izpostavili devet različnih akrilnih lazurnih sistemov. Premazni sistemi so se razlikovali v barvnem tonu, številu slojev filmov premaza, tehniki nanašanja ter po vsebnosti različnih vrst UV absorberjev. Pred, med in po staranju smo preučevali sijaj, barvo, pojav napak, oprijemnost premaza, določeno po metodi z odtrgovanjem pečatov in mokro oprijemnost, določeno z metodo križnega zarezovanja. Ugotavljali smo še prepustnost premaznega sistema oz. absorpcijo vode preko filma v premazane preskušance. Rezultati so pokazali, da imata oba postopka staranja podoben vpliv na testirane površinske sisteme, kar še posebej velja za barvo in sijaj. Barvno stabilnost in majhne spremembe sijaja med staranjem lahko zagotovimo s pravilno izbiro UV absorberja. Izkazalo se je tudi, da ima debelina premaznega sistema pomemben vpliv na njegovo oprijemnost in prepustnost za tekočo vodo. Povezav med nastankom napak na premaznem sistemu pri umetnem pospešenem in pri naravnem staranju nismo potrdili, verjetno zaradi prekratkega časa izpostavitve vremenskim vplivom med postopkom naravnega staranja. For the surface protection of wood, intended for outdoor use, stain coatings with water-based acrylic binders have been established. During the use, so products as well as a coating system are exposed to weathering% ageing. The effects of ageing on a surface system can be determined with natural as well as with a significantly faster artificial accelerated ageing. To determine the effects of ageing on characteristics of coatings and to compare the natural and artificial accelerated ageing, we subjected nine various acrylic stain systems to both ageing procedures. The coating systems differed in hue, the number of layers of coating films, application technique, and content of various UV absorber types. Before, during and after ageing we therefore examined gloss, colour, defect occurrence, adhesion of a coating determined using the pull-off test method, and wet adhesion determined using the cross-cut test method. We also determined the permeability of a coating system, i.e. water absorption through a film into the coated test pieces. The results showed that both ageing procedures have similar effects on the tested surface systems, which is especially true for colour and gloss. Colour stability and small changes in gloss during ageing can be achieved with the right choice of an UV absorber. Additionally, the thickness of a coating system has been shown to have a significant effect on its adhesion and liquid water permeability. The links between the occurrence of defects on a coating system in the artificial accelerated and natural ageing were not confirmed, probably due to a too-short weathering period during the natural ageing procedure. lazura naravno staranje umetno pospešeno staranje oprijemnost sijaj barva prepustnost za vodo stain natural ageing artificial accelerated ageing adhesion gloss colour water permeability true false false B. Gramc Slovenski jezik Angleški jezik Diplomsko delo 2024-06-21 11:44:30 2024-06-21 11:44:34 2024-07-05 03:40:55 0000-00-00 00:00:00 2016 0 Ljubljana 2016 Ljubljana IX, 46 f., [15] f. pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*829.1 2636425 UNI_Gramc_Bostjan_2016.pdf UNI_Gramc_Bostjan_2016.pdf 1 4D1EE82CC33B2F775C75F102D4F1325D 9a7f748b2f1ad71227102579e22417f9811136385c640696f9e059f1d60ab434 df2affe8-2fb2-11ef-a25b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186589 Biotehniška fakulteta 0 0 0