20.500.12556/RUL-158873 Učinkovitost biocidnih proizvodov za zaščito lesa, na osnovi borovih spojin in montanskega voska diplomsko delo - visokošolski strokovni študij Efficacy of biocidal products for wood protection based on boron compounds and montan wax graduation thesis - higher professional studies Borove spojine so že v majhnih koncentracijah zelo učinkoviti biocidi, ki podobno kot drugi biocidi, lahko negativno vplivajo na ljudi in okolje. V les se slabo vežejo in se zato iz njega izpirajo. V sklopu raziskave smo uporabili vodno raztopino borove kisline (H3BO3), ki smo jo kombinirali z emulzijo montanskega voska LGE. Vzorci so bili impregnirani s pripravki različnih koncentacij: H3BO3 (0,1 %; 0,2 %; 0,4 %; 0,8 %), LGE (0 %, 50 %, 100 %). Emulzijo montanskega voska LGE smo dodali borovi kislini H3BO3, ker smo s tem želeli izboljšati učinkovitost sistema proti lesnim glivam. Iz preteklih raziskav pa je že znano, da ta sistem zmanjša izpiranje iz lesa. Vzorci so bili izdelani iz bukovega in smrekovega lesa. Bukove vzorce smo izpostavili delovanju gliv bele trohnobe (Hypoxylon fragiforme, Trametes versicolor, Pleurotus ostreatus), smrekove pa glivam rjave trohnobe (Antrodia vaillantii, Serpula lacrymans, Gloeophyllum trabeum), kot to prepisuje nekoliko modificiran standard SIST EN 113. Po 13 tednih smo vzorce izolirali in jim gravimetrično določili izgubo mas. Iz rezultatov je razvidno, da raztopine nekaterih koncentracij voska LGE in borove kisline H3BO3, dobro zaščitijo les pred glivami razkrojevalkami. Emulzija voska in borova kislina na glive razkrojevalke delujeta sinergično Boron compounds are very effective biocides. They perform well at rather low concentrations. However, boron compounds, like other biocides could have a negative impact on humans and in general on the environment. One of the most important weaknesses of boron compounds is the fact, that they do not react with wood, and thus they are easily leached out. The objective of the present Thesis, was to improve performance of boric acid treated wood with the addition of wax emulsion. The samples made of beech and Norway spruce wood were impregnated with the solutions of different concentrations: H3BO3 (0.1%, 0.2%, 0.4% and 0.8%), LGE (0%, 50% and 100%). The emulsion of montan wax LGE was together with boric acid H3BO3, as the past studies indicate, that this combination could result in reduced boron leaching. Beech wood samples were then exposed to the white-rot fungi (Hypoxylon fragiforme, Trametes versicolor, Pleurotus ostreatus), while the spruce wood was exposed to the brown-rot fungi (Antrodia vaillantii, Serpula lacrymans, Gloeophyllum trabeum), as it is prescribed by the modified EN 113 Standard. After 13 weeks of exposure, the samples were isolated and we gravimetrically determined their loss of mass. The results show that the solutions with the certain concentrations of LGE wax and boric acid H3BO3, well protect the wood from any fungal decay. Even more, they act synergistically. les zaščita lesa borove spojine voski glive razkrojevalke wood wood protection boron compounds waxes wood decay fungi true false false B. Lavka Slovenski jezik Angleški jezik Diplomsko delo 2024-06-21 12:02:33 2024-06-21 12:02:35 2024-07-05 03:44:17 0000-00-00 00:00:00 2016 0 Ljubljana 2016 Ljubljana VIII, 48 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*841.1 2502537 UNI_Lavka_Barbara_2016.pdf UNI_Lavka_Barbara_2016.pdf 1 1FF6C9843EC2878865507C7AB0CB1E23 81d42c1c8abf79f8c79a05a99874854ce67a908136f903d67b0b91bf75b815f8 63c5a708-2fb5-11ef-a25b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186602 Biotehniška fakulteta 0 0 0