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Sorpcijske lastnosti lesa impregniranega z vodno emulzijo montanskega voska in borove kisline : diplomsko delo - univerzitetni študij
Melanšek, Žiga (Author), Humar, Miha (Mentor) More about this mentor... This link opens in a new window, Gorišek, Željko (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/dn_melansek_ziga.pdf This link opens in a new window

Abstract
Borova kislina je že v majhnih koncentracijah zelo učinkovit biocid, ki neznatno škoduje ljudem in okolju. Žal pa se v les slabo veže in se iz njega izpira. Številni avtorji poročajo, da borove spojine povečajo higroskopnost lesa. Za izboljšavo vezave in učinkovitosti smo jih kombinirali z vodno emulzijo montanskega voska različnih koncentracij. Pričakovali smo, da bo impregnacija z vodnimi emulzijami voska znižala vlažnost impregniranega lesa med potapljanjem v vodo in uravnovešanjem v vlažnem okolju. Vzorce iz smrekovine smo vakuumsko impregnirali z izbranimi zaščitnimi pripravki na osnovi montanskega voska in borove kisline. Pripravili smo 2 tipa vzorcev: 240 za ovrednotenje hitrosti navlaževanja v vodi in zraku, 110 za določanje sorpcijskih krivulj v 5 različnih klimah (20 %, 33 %, 65 %, 87 % in 98 %). Ugotovili smo, da je impregnacija z vodno emulzijo voska upočasnila adsorpcijo vode v impregnirani les. Poleg tega smo potrdili, da kombinacija emulzije voska in borove kisline ne izboljša le delovanja proti glivam razkrojevalkam, temveč se odraža tudi v ugodnejših sorpcijskih lastnostih impregniranega lesa.

Language:Slovenian
Keywords:les, smrekovina, zaščita lesa, vlažnost, montanski vosek, borove spojine, sorpcija
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2009
Publisher:[Ž. Melanšek]
Number of pages:XII, 73 f., [7] f. pril.
Place:Ljubljana
UDC:630*841
COBISS.SI-ID:1754249 Link is opened in a new window
Views:759
Downloads:140
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Secondary language

Language:English
Abstract:
Boric acid is very effective biocide in relatively low concentrations. It does not have negative influence on humans and environment. Boron compounds do not react with wood and, therefore, leach from it, unfortunately. Furthermore, there are several reports that boron compounds decrease hygroscopic properties of wood. To improve boron fixation in wood boron compounds were combined with montan wax emulsions of various concentrations. It was presumed that addition of wax would lower moisture content of wood during soaking in water, and during conditioning of wood in humid climate. To elucidate this issue, Norway spruce wood specimens were impregnated with selected wood preservatives, based on montan wax and boric acid emulsions. 2 sets of specimens were prepared, 240 for determination of velocity of water adsorption during immersion in water and during conditioning in humid atmosphere (RH = 80 %). 110 specimens were used to prepare sorption curve through conditioning of impregnated and control specimens at 5 different climates (20 %, 33 %, 65 %, 87 % in 98 %). The results show that treatment with water wax emulsions considerably reduces adsorption of water. Besides improvements of fungicidal properties, the combination of montan wax and boric acid also improves sorption properties of wood.

Keywords:wood, Norway spruce, wood preservation, moisture, montan wax, boron compounds, sorption

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