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Vpliv časa fiksacije zaščitnih pripravkov na osnovi bakra in etanolamina na izpiranje : diplomsko delo (visokošolski strokovni študij)
Golež, Branko (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_golez_branko.pdf New window

Abstract
Bakrove spojine so učinkoviti in zelo razširjeni fungicidi. Njihova poglavitna slabost je neustrezna vezava v les. Ta lastnost omejuje uporabo zaščitenega lesa na mestih, kjer prihaja do izpiranja aktivnih komponent. Fiksacijo bakrovih učinkovin lahko močno izboljšamo z dodajanjem aminov in karboksilnih kislin. Ugotavljali smo kako čas vezave vpliva na fiksacijo baker-etanolaminskih pripravkov v les. Smrekove vzorce smo, v skladu s postopkom polnih celic, impregnirali s 3 različnimi kombinacijami in koncentracijami zaščitnih pripravkov na osnovi bakra, etanolamina, oktanojske kisline, kvartarnih amonijevih spojin in bora ter jim gravimetrično določili mokri navzem. Po določenem času (0, 3, 7, 14, 28 dni) kondicioniranja smo jih, v skladu s standardno metodo SIST ENV 1250/2, izpirali. Delež izpranega bakra v izpirkih smo določili z atomsko absorpcijsko spektroskopijo (AAS). Ugotovili smo, da se delež izpranega bakra prvih 14 dni zmanjšuje, nato pa zopet narašča. Prvi teden poteka vezava Cu preko etanolamina v les. Po 2 tednih pa pride bolj do izraza depolimerizacija lesnih polimerov: to povzroči etanolamin, ki na ta način vpliva na izpiranje bakrovih učinkovin iz lesa.

Language:Slovenian
Keywords:zaščita lesa, bakrovi pripravki, izpiranje, vezava
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2006
Publisher:[B. Golež]
Number of pages:VIII, 35 f.
Place:Ljubljana
UDC:630*841.1
COBISS.SI-ID:1446281 Link is opened in a new window
Views:541
Downloads:130
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Secondary language

Language:English
Abstract:
Copper compounds are very effective and frequently used fungicides. Their most important disadvantage is their low fixation in wood, which decreases possibilities of use of copper impregnated timber, particularly in places where leaching of active ingredients occurs. Fixation of copper can be significantly improved with addition of amines and carboxylic acids. To find out how time influences the fixation of copper into spruce-wood samples were impregnated with 3 different preservatives in 3 different concentrations: based on copper, ethanolamine, octanoic acid, quaternary ammonium compound and boron; according to the full cell procedure. Then their retention was gravimetrically determined. After pre-determined periods of conditioning (0, 3, 7, 14, and 28 days), samples were leached according to the standard method SIST ENV 1250/2. The percentage of the leached copper in the leachates was determined with the atomic absorption spectroscopy. The results show that the percentage of the leached copper decreases in the first 14 days of fixation, later the percentage begins to increase again. In the first week copper binds via ethanolamine into wood. But after 2 weeks, depolymerisation of wood polymers caused by ethanolamine becomes more prominent and thus influences leaching.

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

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