izpis_h1_title_alt

Spremembe vrednosti pH zaščitnih pripravkov med impregnacijo lesa : diplomsko delo (visokošolski strokovni študij)
Horvat, Žiga (Author), Humar, Miha (Mentor) More about this mentor... This link opens in a new window, Petrič, Marko (Reviewer)

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

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.

Language:Slovenian
Keywords:zaščita lesa, bakrovi pripravki, etanolamin, pH pripravki, vezava
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2007
Publisher:[Ž. Horvat]
Number of pages:VIII, 35 f.
Place:Ljubljana
UDC:630*841.1
COBISS.SI-ID:1514121 Link is opened in a new window
Views:583
Downloads:227
Metadata:XML RDF-CHPDL DC-XML DC-RDF
 
Average score:(0 votes)
Your score:Voting is allowed only to logged in users.
:
Share: Bookmark and Share

Secondary language

Language:English
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

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back