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Mehanske lastnosti lesa impregniranega s pripravki na osnovi bakra in etanolamina : diplomsko delo
Kirar, Sebastjan (Author), Humar, Miha (Mentor) More about this mentor... This link opens in a new window, Bučar, Bojan (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/vs_kirar_sebastjan.pdf New window

Abstract
Pripravki za zaščito lesa na osnovi bakra in etanolamina so nadomestili pripravke na osnovi bakra in kroma. Fiksacija baker-etanolaminskih pripravkov še ni tako učinkovita kot fiksacija baker-kromovih pripravkov. Domnevali smo, da etanolamin lahko povzroči depolimerizacijo lignina, ta pa večje izpiranje. Da bi ugotovili razlog za slabo fiksacijo baker-etanolaminskih pripravkov, smo vzorce smreke (Picea abies) in bukve (Fagus sylvatica) impregnirali s 3 različnimi pripravki na osnovi bakra in etanolamina v 3 različnih koncentracijah. Vzorce smo najprej izpirali, zatem pa jim gravimetrično določili spremembo mase. Modul elastičnosti (E) smo merili po nedestruktivni metodi, vzporedno pa analizirali količino bakra, dušika in ogljika v izpirkih. Količino dušika in ogljika smo merili tudi v izpranih in neizpranih vzorcih. Rezultati so pokazali, da prisotnost etanolamina v zaščitnih pripravkih povzroča spremembo modula elastičnosti (E). V izpirkih smo zaznali povečano količino bakra in ogljika ter opazili dobro povezavo med izpranim bakrom in organskim ogljikom. Glavni vir organskega ogljika so bile komponente lesa. S tem smo potrdili zastavljeno hipotezo.

Language:Slovenian
Keywords:etanolamin, baker, depolimerizacija, mehanske lastnosti, fiksacija, izpiranje
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2007
Publisher:[S. Kirar]
Number of pages:VIII, 47 f.
Place:Ljubljana
UDC:630*842.3
COBISS.SI-ID:1564041 Link is opened in a new window
Views:642
Downloads:187
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Secondary language

Language:English
Abstract:
Copper-ethanolamine based wood preservatives are replacing classical copper-chromium based solutions. Fixation of copper-ethanolamine based wood preservatives is not as good as fixation of copper-chromium ones. We presumed ethanolamine to cause depolymerization of lignin, what consequences in increased leaching. To find the reason for insufficient fixation of copper-ethanolamine formulations, Norway spruce (Picea abies) and beech (Fagus sylvatica) wood specimens were impregnated with 3 different aqueous solutions consisting of copper-ethanolamine and additives/co-biocides of 3 different concentrations. After fixation, those specimens were leached; afterwards the mass change was gravimetrically determined. Modulus of elasticity (MoE) was determined using non-destructive technique; copper, nitrogen and carbon contents in leachates were analysed. Carbon and nitrogen contents in leached and un-leached wood blocks were measured as well. The results show that the presence of ethanolamine in preservative solutions causes MoE change. In leachates, significantly increased carbon as well as copper contents was determined. There was good correlation between organic carbon in leachates and copper leaching. The main source of organic carbon was wood components. Therefore, we believe that our hypothesis of ethanolamine induced lignin depolymerization is confirmed.

Keywords:ethanolamine, copper, depolymerization, mechanical properties, fixation, leaching

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