20.500.12556/RUL-417 Odpornost lesa modificiranega s sredstvom Meldur-DMES proti glivam modrivkam diplomsko delo - visokošolski strokovni študij Resistance of Meldur-DMES modified wood against blue stain fungi graduation thesis - higher professional studies Izvedli smo modifikacijo lesa s sredstvom Meldur-DMES v kombinaciji s termično modifikacijo in preučili odpornost modificiranega lesa proti glivam modrivkam. Vzorce smo pripravili iz beljave bora (Pinus sylvestris) in beljave smreke (Picea abies) po standardu SIST EN 152. Modificirali smo jih v vakuumski komori pri različnih koncentracijah (5 % in 10 %) Meldurja, brez in s katalizatorjem. Modificirane vzorce smo pred izpostavitvijo glivam izprali po standardu SIST EN 84. Test smo izvedli z glivama, in sicer Aureobasidium pullulans in Sclerophoma pithyophila po standardu SIST EN 152. Po 6-tedenski izpostavitvi smo vzorcem vizualno določili pomodrelost površine. Ugotovili smo, da je pri višji koncentraciji modifikacijskega sredstva (10 % raztopina z dodatkom katalizatorja) in pri višji temperaturi (170 °C) dosežena višja stopnja odpornosti lesa proti glivam modrivkam. Izjema so vzorci beljave bora, modificirani pri temperaturi 170 °C, ki so brez kemične modifikacije dosegli popolno odpornost pred obarvanjem z glivami modrivkami. Modification of wood was carried out with Meldur-DMES in a combination with a thermal modification, so as the resistance of modified wood to blue fungi was analysed. The samples were prepared from the sapwood of a pine tree (Pinus sylvestris) and from the sapwood of a spruce (Picea abies) according to the SIST EN 152 standard. They were modified in a vacuum-chamber at different Meldur concentrations (5 % and 10 % solution) with and without a catalyst. The modified samples were washed out according to the SIST EN 84 standard before their exposal to fungi. The test was carried out according to the SIST EN 152 standard with 2 fungi, Aureobasidium pullulans and Sclerophoma pithyophila. After being exposed for 6 weeks, the portions of the surfaces turned blue were defined. It was found out that the higher level of resistance of wood to the blue fungi was achieved at a higher concentration of Meldur, 10 % solution with the addition of a catalyst and at higher temperature (170 °C). The exceptions are the samples of a spruce tree, modified at temperature of 170 °C, which achieved a complete resistance to the colouring with the blue fungi. les modifikacija Meldur-DMES WPC glive modrivke wood modification Meldur-DMES WPC blue stain fungi true false false [J. Rot] Slovenski jezik Angleški jezik Diplomsko delo 2014-07-11 12:25:29 2014-07-11 12:25:29 2022-07-11 10:24:07 0000-00-00 00:00:00 2009 0 Ljubljana 0 XIII, 84 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*844.1 1760649 vs_rot_janez.pdf vs_rot_janez.pdf 1 0E809AC69F961A6450D785DA4E2EDEA4 284a77039c9c3e7d8ef1883163cdb808b10aaf00d0e559786350b1a97681ca91 5f26ab7e-a1b9-11eb-a523-00155dcfd717 20.500.12556/rul/9de16f62-4b8e-40eb-9d9e-240a219600c5 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132336 Biotehniška fakulteta 0 0 0