Spremembe vrednosti pH zaščitnih pripravkov med impregnacijo lesa : diplomsko delo (visokošolski strokovni študij)

Horvat, Žiga (author), Humar, Miha (mentor), Petrič, Marko (reviewer)

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.

• Language: Slovenian
• Keywords: zaščita lesa, bakrovi pripravki, etanolamin, pH pripravki, vezava
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [Ž. Horvat]
• Year: 2007
• Number of pages: VIII, 35 f.
• PID: 20.500.12556/RUL-209
• UDC: 630*841.1
• COBISS.SI-ID: 1514121
• Publication date in RUL: 11.07.2014

HORVAT, Žiga, 2007, Spremembe vrednosti pH zaščitnih pripravkov med impregnacijo lesa : diplomsko delo (visokošolski strokovni študij) [online]. Bachelor’s thesis. Ljubljana : Ž. Horvat. [Accessed 8 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=209

Secondary language

• Language: English
• Title: Changes of pH value of preservative solutions during impregnation : graduation thesis (higher professional studies)

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.

• Keywords: wood preservation, copper based preservatives, ethanolamine, pH, fixation