Lastnosti macesnovega lesa obdelanega z emulzijami voskov

Žitko, Samo (author), Lesar, Boštjan (mentor)

Sibirskega macesna se drži sloves odporne drevesne vrste. Zaradi vse večje uporabe macesnovine, se uporabniki pogosto zatekajo k alternativam. Zato se na trgu vse pogosteje pojavlja tudi plantažni les macesna, ki ima slabše odpornostne lastnosti. Sibirski macesen je znan tudi po problemih povezanih z iztekanjem smole. Zato smo želeli raziskati možnosti pred obdelave oziroma različne priprave površin lesa sibirskega macesna, ki bo omogočala kakovostno obdelavo. Zanimal nas je vpliv različnih temperatur sušenja na iztekanje smole. Najbolje se je izkazala najvišja temperatura. Zato smo polovico vseh vzorcev za 30 minut izpostavili na 140 °C. Za medsebojno primerjavo smo teste izvajali še na navadni in termično modificirani smrekovini. Vzorce smo zaščitili z različnimi koncentracijami hidrofobnega pripravka Silvacera (emulzija voska) in oljem Remmers. Lastnosti površine smo ovrednotili v laboratoriju, obnašanje modificiranega lesa smo spremljali tudi med terensko izpostavitvijo. Z laboratorijskimi testi smo ovrednotili vodoodbojnost, kratkotrajni in dolgotrajni navzem vode in vodne pare. Vzorce na prostem smo izpostavili vremenskim vplivom in opazovali barvne in površinske spremembe. Termično modificirana smrekovina je izkazovala najboljše lastnosti pri testih v laboratoriju. S termično modifikacijo se izboljšajo sorpcijske lastnosti in večja dimenzijska stabilnost zaradi manjše higroskopnosti. Zunanji testi so pokazali, večja kot je bila koncentracija pigmenta, manjše barvne spremembe smo zaznali.

• Language: Slovenian
• Keywords: vosek, sibirski macesen, smrekovina, hidrofobni pripravki, staranje
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Place of publishing: Ljubljana
• Publisher: [S. Žitko]
• Year: 2021
• Number of pages: XI, 68 str.
• PID: 20.500.12556/RUL-125689
• UDC: 630*842.2
• COBISS.SI-ID: 57973507
• Publication date in RUL: 02.04.2021

ŽITKO, Samo, 2021, Lastnosti macesnovega lesa obdelanega z emulzijami voskov [online]. Master’s thesis. Ljubljana : S. Žitko. [Accessed 14 June 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=125689

Secondary language

• Language: English
• Title: Properties of larch wood treated with wax emulsions

Abstract

Siberian larch has the reputation of a resistant tree species. However, due to its growing use alternatives are now being sought, with plantation wood, which has lower durability, increasingly appearing on the market. Siberian larch is known for issues associated with processing due to resin emissions. Therefore, we wanted to explore the possibilities of pre-treatment or various surface preparations of Siberian larch wood, which will enable quality treatment. We did a few quick tests beforehand. We were interested in the influence of different temperatures on resin leakage. The highest temperature roved to be the best. Half of all samples were exposed to 140 ° C for 30 minutes. For comparison purposes we performed the same tests on ordinary and heat-treated spruce. Samples were protected with various concentrations of Silvacera hydrophobic system (wax emulsion) and Remmers oil. Surface properties were tested in the laboratory and outdoors. In the laboratory we were interested in water repellence, short-term and long-term intake of water and water vapor. Outdoor samples were exposed to changing weather conditions. In this case, colour and surface changes were observed. Heat-treated spruce exhibited the best properties in laboratory tests. Better sorption properties and more excellent dimensional stability due to lower hygroscopicity are known for heat treatment. External tests showed the higher the pigment concentration, the more minor colour changes were detected. In some cases, pre-treatment did not affect the absorption of the preservative agent, and in others it worsened it.

• Keywords: wax emulsions, Siberian larch, spruce, hydrophobic formulations, ageing