magistrska naloga
Klemen Zupančič (Author), Franc Pohleven (Reviewer), Miha Humar (Mentor), Boštjan Lesar (Co-mentor)

Abstract

Les je naravni material, ki se dandanes vse bolj uporablja v gradbene namene. Ker vse vrste lesa niso dovolj odporne, jih je treba primerno zaščititi. V naši raziskavi smo uporabili manj odporno smrekovino in jo zaščitili z nebiocidnimi sredstvi. Les smrekovine smo impregnirali s suspenzijo naravnega voska in ga termično modificirali. Termična modifikacija je potekala pri temperaturah 100 °C, 185 °C, 200 °C, 215 °C in 230 °C. Sledila je impregnacija z naravnim voskom, ki je bila izvedena po 2 postopkih (potapljanje in vakuumska tlačna impregnacija), pri 2 različnih koncentracijah (2,5 % in 5 %). Preučevali smo vpliv termične modifikacije, način impregnacije in koncentracijo suspenzije voska na navzem vodne pare, mehanske lastnosti in odpornost proti glivam. Izkazalo se je, da termična modifikacija v večji meri vpliva na izgubo mase vzorcev in s tem poslabšanje mehanskih lastnosti lesa, pozitivno pa vpliva na odpornost proti glivam. Pri določanju prodiranja vodne pare v les sta obe koncentraciji pokazali, da po obdelavi z voski ostaja površina difuzijsko odprta. Bolj kot sama koncentracija, pa je odločilen način impregnacije lesa, pri čemer se je v večji meri izkazala vakuumska tlačna impregnacija

Keywords

vosek;smrekovina;impregnacija;lesne glive;termična modifikacija;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [K. Zupančič]
UDC: 630*84
COBISS: 2434953 Link will open in a new window
Views: 45
Downloads: 7
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Other data

Secondary language: English
Secondary title: Properties of wax impregnated thermally modified spruce
Secondary abstract: Wood is a natural material, which is now increasingly used for construction purposes. As all wood species are not sufficiently durable, they should be adequately protected. In our study, we used non-durable Norway spruce, and protected it with non-biocidal products. Spruce was impregnated with a suspension of natural wax, and then thermally modified. The thermal modification was carried out at different temperatures 100 °C, 185 °C, 200 °C, 215 °C and 230 °C. This was followed by the impregnation with the natural wax, which was carried out by 2 methods (immersion and vacuum pressure impregnation), at 2 different concentrations (2.5 % and 5 %). We studied how the thermal modification, the manner of impregnation and the concentration of wax affect the uptake of water vapour, the mechanical properties and resistance to fungi. It has been shown that the thermal modification has a greater impact on the mass loss of the samples, and thus the deterioration of the mechanical properties of wood, but has a positive influence on the resistance to fungi. On the uptake of water vapour, both of the concentrations could be slowed down with proper wax treatment, but for better protection it would be preferred to use the 5 % concentration. More important than the use of concentration is the use of impregnation of wood, in which the vacuum pressure proved to be better
Secondary keywords: wax;spruce;impregnation;wood decay fungi;thermal modification;
Type (COBISS): Master's thesis/paper
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: IX, 51 f.
ID: 24398912