20.500.12556/RUL-661 Vpliv kemikalij, ki povzročajo nabrekanje celične stene, na impregnabilnost smrekovine diplomsko delo - univerzitetni študij Influence of the wood swelling agents on the impregnability of the Norway spruce graduation thesis - university studies Baker-etanolaminski pripravki so trenutno ena izmed najpomembnejših skupin za zaščito lesa v 3. in 4. razredu izpostavitve po standardu SIST EN 335-1/2. Pogosto jih uporabljamo za zaščito naravno neodporne smrekovine, ki v Sloveniji predstavlja najpogosteje uporabljano lesno vrsto v konstrukcijske namene. Pri impregnaciji smrekovine z baker-etanolaminskimi pripravki se soočamo s problemom slabe penetracije in izpiranjem bakra iz impregniranega lesa. Z namenom, da bi to težavo omilili, smo obstoječemu Cu-EA pripravku Silvanolinu dodali pet različnih kemikalij, ki povzročajo nabrekanje celične stene (amonijak, dimetil sulfoksid, etilen glikol, trietanolamin in mravljinčno kislino) v treh različnih koncentracijah (2,5 %, 5 % in 10 %). S posameznimi raztopinami smo impregnirali smrekove vzorce z vakuumsko-tlačnim in vakuumskim postopkom in nato določili mokre navzeme, globino penetracije ter delež izpranega bakra po standardu ENV 1250-2. Ugotovili smo, da sta dodatka mravljinčne kisline in trietanolamina močno povečala penetracijo in navzem Cu-EA pripravka v les, obenem pa sta poslabšala fiksacijo bakra v lesu. Copper-ethanolamine based preservatives are one of the most important preservatives for wood protection in 3rd and 4th use class according to EN 335-1/2. They are often used to protect spruce wood, naturally not durable enough, nevertheless, frequently used for construction applications. One of the issues related to copper-ethanolamine solutions is insufficient penetration, and copper leaching from impregnated spruce wood. In order to overcome these issues, commercial Cu-EA based solution was supplemented with five different wood swelling agents (ammonia, dimethyl sulfoxide, ethylene glycol, triethanolamine and formic acid) in three different concentrations (2.5 %, 5 % and 10 %). Spruce wood specimens were impregnated with particular solutions, and two different protocols were utilized (vacuum and vacuum-pressure). Uptakes of preservative solution, depth of penetration and percentage of leached copper were determined according to ENV 1250-2. The results show that formic acid and triethanolamine improve the depth of penetration and uptakes of preservative solution, but on the other hand, both of these wood swelling agents increase copper leaching from impregnated wood. zaščita lesa baker-etanolaminski pripravki nabrekanje celične stene izpiranje bakra impregnacija smrekovine wood preservation copper-ethanolamine preservatives wood swelling agents agents copper leaching impregnation of spruce wood true false false [A. Pajor] Slovenski jezik Angleški jezik Diplomsko delo 2014-07-11 12:26:35 2014-07-11 12:26:35 2022-07-11 10:39:04 0000-00-00 00:00:00 2012 0 Ljubljana 0 IX, 64 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*841.1 2027913 dn_pajor_ajda.pdf dn_pajor_ajda.pdf 1 7D55C04AD28FE84505AD00FF8C5A1E7B 80923f1ce016dd9ce8e1519af0e6d734f7d7f5c4db559a33fd1185bf574b48b4 673e5175-a1b9-11eb-a523-00155dcfd717 20.500.12556/rul/ff7a4f40-9c38-4809-9227-93b84d86b340 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132460 Biotehniška fakulteta 0 0 0