Spremembe vrednosti pH zaščitnih pripravkov med impregnacijo lesa

diplomsko delo (visokošolski strokovni študij)

Žiga Horvat (Author), Marko Petrič (Reviewer), Miha Humar (Mentor)

Abstract

Baker-etanolaminske pripravke uporabljamo za zaščito lesa že skoraj 20 let. Kljub temu mehanizem interakcij teh pripravkov z lesom še ni v celoti pojasnjen. Z željo osvetliti interakcije med vodnimi raztopinami bakrovega(II)sulfata in etanolamina smo smrekovo (Picea abies) žagovino namočili v 19 različnih kombinacij vodnih raztopin bakrovih aktivnih komponent. Poleg bakrovega(II) sulfata so ti zaščitni pripravki vsebovali še etanolamin in kvartarno amonijevo spojino ter bor ali oktanojsko kislino. Ves čas impregnacije smo spremljali pH vrednost sistema. Po 4 urah namakanja smo žagovino stresli na filtrirni papir in sprali z destilirano vodo. To impregnirano žagovino smo nato posušili pri 103 °C. Zatem smo določili vsebnost bakra in dušika v prahu. Ti dve vrednosti smo nato primerjali s spremembo vrednosti pH med impregnacijo. Rezultati so potrdili, da etanolamin močno izboljša vezavo bakrovih spojin na funkcionalne skupine lesa. Ugotovili smo, da je absorpcija bakra v lesu v povezavi s koncentracijo bakra v zaščitnem pripravku, pH vrednostjo sistema in spremembo vrednosti pH med impregnacijo. Nadalje smo potrdili, da sta absorpcija bakrovih spojin in absorpcija dušika ravno tako tesno povezani. Ta dejstva so pomembna za razvoj novih učinkovitejših zaščitnih pripravkov za les.

Keywords

zaščita lesa;bakrovi pripravki;etanolamin;pH pripravki;vezava;

Data

Language:	Slovenian
Year of publishing:	2007
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[Ž. Horvat]
UDC:	630*841.1
COBISS:	1514121
Views:	1249
Downloads:	348
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Changes of pH value of preservative solutions during impregnation
Secondary abstract:	Despite of the fact that copper-ethanolamine based solutions have been used for wood preservation for almost 2 decades, the complete mechanism of Cu-ethanolamine fixation is not completely understood. To elucidate interactions between copper-ethanolamine aqueous solutions and wood, Norway spruce (Picea abies) sawdust was immersed to 19 different copper based formulations. These solutions besides copper(II) sulphate contained ethanolamine and quaternary ammonium compoud, sodium borate and/or octanoic acid. pH value of this mixtures was monitored for 4 hours. Immersed sawdust was put to filter paper and washed with one litre of distilled water. Leached impregnated wood was than oven dried (103 °C), and kept in dark and dry place until copper and nitrogen content were determined and correlated to pH changes of sawdust-preservative suspension during impregnation. The result showed that presence of ethanolamine made fixation of copper in wood more effective. Copper absorption to sawdust was affected by concentration of copper, pH value of preservative solution, and it is in tight correlation with pH decrease during impregnation. Furthermore, it was proved that copper and nitrogen absorption into Norway spruce wood were connected as well. Understanding of this mechanism will enable experts to develop preservatives with better performance against weathering and wood pests.
Secondary keywords:	wood preservation;copper based preservatives;ethanolamine;pH;fixation;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Diplomsko delo, Univ. v Ljubljani, Biotehniška fakulteta, Oddelek za lesarstvo
Pages:	VIII, 35 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:	21106