diplomsko delo
Sebastjan Kirar (Author), Bojan Bučar (Reviewer), Miha Humar (Mentor)

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.

Keywords

etanolamin;baker;depolimerizacija;mehanske lastnosti;fiksacija;izpiranje;

Data

Language: Slovenian
Year of publishing:
Source: Ljubljana
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [S. Kirar]
UDC: 630*842.3
COBISS: 1564041 Link will open in a new window
Views: 1231
Downloads: 302
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Mechanical properties of wood impregnated with copper-ethanolamine based wood preservatives
Secondary 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.
Secondary keywords: ethanolamine;copper;depolymerization;mechanical properties;fixation;leaching;
Type (COBISS): Undergraduate thesis
Thesis comment: Diplomsko delo, Univ. v Ljubljani, Biotehniška fakulteta, Oddelek za lesarstvo
Pages: VIII, 47 f.
Keywords (UDC): applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID: 21157