1. Vpliv umetno pospešenega staranja na lastnosti površinskih premazov na nemodificiranem in na modificiranem lesuMiro Tomažič, Matjaž Pavlič, Borut Kričej, Primož Štefe, Marko Petrič, 2004, original scientific article Abstract: Za zunanjo uporabo se v svetu namesto naravnega lesa uvaja uporaba modificiranega lesa, ki je dimenzijsko stabilnejši. V literaturi pa je še vedno zelo malo podatkov o sistemih modificiran les - površinski premaz. Zato je bil cilj naše raziskave preučiti lastnosti premazov za zunanjo uporabo na termično modificiranem lesu rdečega bora in nekaterih drugih lesnih substratih. Izvedli smo umetno pospešeno staranje nepremazanih in premazanih vzorcev ter ugotavljali vplive tega postopka na lastnosti, kot so oprijemnost premaza, barva, sijaj, kontaktni kot za vodo ter prepustnost premaza za vodno paro in tekočo vodo. Ugotovili smo, da je sistem "termično modificiran rdeči bor - premaz" primerljiv s sistemom "nemodificiran les - premaz".
Keywords: termična modifikacija, premazi, umetno staranje, pospešeno staranje, oprijemnost, barva, sijaj, kontaktni kot
Published in DiRROS: 12.07.2017; Views: 5231; Downloads: 2069
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2. Lesne polioze listavcevVesna Tišler, Matjaž Pavlič, 2000, review article Abstract: Prispevek obravnava lesne polioze (hemiceluloze) listavcev. Le-te so poleg celuloze eden od obnovljivih naravnih organskih snovi. Lesovi listavcev imajo drugačno vsebnost in sestavo lesnih polioz kot iglavci. Delež polioz v lesu listavcev se giblje do 40 %. Predstavljajo zanimivi vir kemikalij: ksiloze, ksilitola, furfurala, hidroksimetilfurfurala, levulinske kisline in drugih. Za uspešno uporabo lesnih polioz je vsekakor potrebno izredno dobro poznavanje njihove kemijske zgradbe.
Keywords: polioza, hemiceluloza, listavec
Published in DiRROS: 12.07.2017; Views: 5046; Downloads: 1963
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3. Influence of microwave heating in wood preservation on traditional surface coatingsMartin Klinc, Matjaž Pavlič, Marko Petrič, Franc Pohleven, 2017, original scientific article Abstract: Microwaves are very effective at wood pest eradication. However, elevated temperatures may pose a risk of damaging surface coatings used on cultural and historical artefacts. Therefore, we monitored changes in patterns of the original paint taken from such objects along with newly prepared coatings. We evaluated visual, mechanical, and chemical modifications of coatings when exposed to microwaves (750W, 2.4GHz), at 60°C or 80°C for 10 min. Whether old or new, only water-based coatings have proven to be resistant to elevated temperatures and no damage was observed at 80°C. Blisters have formed on layers of new oil paints and natural resins due to insufficiently cured film. Temperatures above 80°C may cause melting of coniferous wood resin and thus transport of resin to the surface; on the other hand, temperatures up to 60°C are completely harmless. Mechanical and chemical changes of coatings exposed to microwaves were not observed, but the studies showed that colour and gloss exhibited minor changes.
Keywords: wood, wood coatings, wood protection, microwaves, heating
Published in DiRROS: 03.07.2017; Views: 6424; Downloads: 3658
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