Vodoodbojnost lesa impregniranega s silanom : diplomsko delo - univerzitetni študij

Brdnik, Blaž (author), Petrič, Marko (mentor), Pavlič, Matjaž (comentor), Straže, Aleš (reviewer)

Zaradi vse večje okoljske ozaveščenosti industrija in raziskovalni inštituti iščejo nove načine za zaščito lesa. Kemična modifikacija lesa s silani je eden od obetavnih pristopov za izboljšanje lastnosti lesa, med njimi tudi hidrofobnosti. V diplomski nalogi smo za hidrofobiranje smrekovega lesa uporabili 1 % raztopino enega od alkiltriklorosilanov v heksanu. Za nanašanje raztopine silana smo uporabili različne načine, kot je premazovanje s čopičem in različno dolgo potapljanje v raztopini silana. Ugotovili smo, da se s kemično modifikacijo površine smrekovega lesa s silanom, kontaktni kot vodne kapljice poveča celo do 140°, prav tako pa se je zmanjšal kapilarni vlek tekoče vode v les. Vzorce smo izpostavili tudi vlažnemu zraku in ugotovili, da površinska kemična modifikacija smrekovega lesa s silanom nima večjega vpliva na ravnovesno vlažnost. Razlika v ravnovesni vlažnosti med impregniranimi vzorci in neobdelanimi vzorci je znašala največ komaj 0,9 %. Prav tako smo izračunali protikrčitveno učinkovitost ASE, in sicer na dva načina. Pri prvem načinu smo vzorce potapljali v vodo pri normalnih pogojih, pri drugem pa smo prepojitev z vodo izvedli v kombinaciji z izpostavitvijo podtlaku in nadtlaku. Pri obeh postopkih smo dobili približno podobne rezultate, in sicer daljši kot je bil čas impregnacije vzorcev v silanu, boljša je bila ASE. Le-ta je dosegla vrednosti do 17,5 %.

• Language: Slovenian
• Keywords: les, silan, vodoodbojnost, ravnovesna vlažnost, protikrčitvena učinkovitost
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: B. Brdnik
• Year: 2016
• Number of pages: IX, 29 f., [3] f. pril.
• PID: 20.500.12556/RUL-158877
• UDC: 630*84
• COBISS.SI-ID: 2642825
• Publication date in RUL: 21.06.2024

BRDNIK, Blaž, 2016, Vodoodbojnost lesa impregniranega s silanom : diplomsko delo - univerzitetni študij [online]. Bachelor’s thesis. Ljubljana : B. Brdnik. [Accessed 18 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=158877

Secondary language

• Language: English
• Title: Water repellency of wood impregnated with silane : graduation thesis - university studies

Abstract

Due to increasing concerns for the environment, the industry and research institutions are looking for new ways to protect wood. One of the most promising methods of improving the properties of wood is chemical modification using silanes. For the purposes of this diploma thesis, hydrophobing of spruce wood was carried out by applying a 1 % hexane solution of a silane from the series of alkyl-trichlorosilanes. The silane solution was applied to the wood either by brushing or immersing it in the solution for various times. The chemical modification of spruce wood with the silane increased the water contact angles on samples by up to 140°. At the same time, the capillary-driven uptake of liquid water into the samples was reduced. We also determined that impregnation with silane has almost no effect on the wood%s equilibrium moisture content (EMC). The difference between the EMC of silane-impregnated wood and untreated wood had a value of only 0.9 %. The anti-swelling efficiency (ASE) was determined in two different ways. The first approach involved immersing samples in water under normal atmospheric pressure and the second involved impregnating the samples with water by applying a combination of exposure to a vacuum and increased pressure. In both cases, similar results were obtained. ASE was higher the longer the silane treatment time lasted. ASE values of up to 17.5 % were achieved.

• Keywords: wood, silane, water repellency, equilibrium moisture content, anti-swelling efficiency