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Fiksacija pripravka na osnovi bakra, etanolamina, oktanojske kisline in bora v impregniranem lesu : diplomsko delo (visokošolski strokovni študij)
Jecl, Boštjan (Author), Pohleven, Franc (Mentor) More about this mentor... This link opens in a new window, Humar, Miha (Co-mentor), Petrič, Marko (Reviewer)

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

Abstract
Največja slabost zaščitnih sredstev na osnovi bakra je, da se baker zelo slabo veže na lesne komponente. To omejuje uporabo impregniranega lesa na mestih, kjer je nevarnost izpiranja aktivnih komponent. Težave z izpiranjem so rešili z dodajanjem kromovih spojin, ki baker dobro fiksirajo v komponente lesa. Ker so kromove spojine zdravju in okolju škodljive, v zadnjem času intenzivno razvijajo okoljsko primernejše pripravke. Kot še posebej primeren fiksator se je izkazal etanolamin z dodatkom oktanojske kisline. Dokazano je, da etanolamin kemijsko reagira z lesom in bakrom ter izboljša njegovo vezavo v les, oktanojska kislina pa deluje hidrofobno. Zato smo raziskovali vpliv koncentracije novega pripravka, postopka zaščite in drevesne vrste na izpiranje bakrovih učinkovin iz lesa. V ta namen smo vzorce 3 drevesnih vrst (bukev, smreka in bor) impregnirali z različnimi kombinacijami in koncentracijami zaščitnih pripravkov na osnovi bakra, etanolamina, oktanojske kisline, kvartarne amonijeve spojine ter bora. Zaščita se je izvajala na 3 načine: s premazovanjem, potapljanjem in v impregnacijski komori. Izpiranje različno zaščitenih vzorcev je potekalo po modificirani standardni metodi SIST EN 1250/2. Delež bakra v izpirkih smo določili z atomsko absorpcijsko spektroskopijo. Ugotovili smo, da se je pri vzorcih, zaščitenih z nižjo koncentracijo izpralo manj bakra kot pri vzorcih, ki so bili prepojeni z višjo koncentracijo zaščitnega pripravka. V povprečju se je najmanj bakra izpralo iz smrekovih vzorcev, prepojenih z raztopino na osnovi bakra, etanolamina in oktanojske kisline. Najslabšo fiksacijo smo dosegli pri premaznih vzorcih.

Language:Slovenian
Keywords:zaščita lesa, bakrovi pripravki, koncentracija pripravkov, izpiranje bakra
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2005
Publisher:[B. Jecl]
Number of pages:VIII, 42 f.
Place:Ljubljana
UDC:630*841.1
COBISS.SI-ID:1335689 Link is opened in a new window
Views:627
Downloads:127
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Secondary language

Language:English
Abstract:
The most important disadvantige of copper based preservatives is low copper fixation on wood components. This is an important drawback, when impregnated wood is used in conditions where leaching of active components is possible. Copper fixation used to be improved with addition of chromium compounds. Due to chromium health and environmental issues, intense researches on environmentally more friendly preservatives are going on. Combinations of ethanolamine and octanoic acid were found as suitable chromium substitutes. It has already been proven that ethanolamine reacts with wood and copper, resulting in improved Cu fixation. On the other hand, octanoic acid has hydrophobic mode of action. Therefore, the influence of concentration of newly developed preservative solutions, method of treatment and wood species on copper leaching were examined. To elucidate those questions, specimens made of spruce, pine and beech were impregnated with different aqueous solutions on the basis of copper, ethanolamine. octanoic acid, quaternary ammonium compounds and boron. Specimens were treated using 3 different procedures: brushing, dipping and vacuum treatment. Leaching was performed according to modified standard procedure SIST EN 1250/2. In comparison to the specimens impregnated with the solution of the higher concentration less copper was leached from the ones impregnated with a lower concentration of preservative solution. On the average, the lowest percentage of Cu was leached from spruce specimens treated with aqueous solution of copper, ethanolamine and octanoic acid. Brushing of the specimens resulted in the highest leaching.

Keywords:wood preservation, copper based preservatives, preservatives concentration, copper leaching

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