20.500.12556/RUL-158877 Vodoodbojnost lesa impregniranega s silanom diplomsko delo - univerzitetni študij Water repellency of wood impregnated with silane graduation thesis - university studies 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 %. 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. les silan vodoodbojnost ravnovesna vlažnost protikrčitvena učinkovitost wood silane water repellency equilibrium moisture content anti-swelling efficiency true false false B. Brdnik Slovenski jezik Angleški jezik Diplomsko delo 2024-06-21 12:08:28 2024-06-21 12:08:30 2024-07-05 03:45:21 0000-00-00 00:00:00 2016 0 Ljubljana 2016 Ljubljana IX, 29 f., [3] f. pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*84 2642825 UNI_Brdnik_Blaz_2016.pdf UNI_Brdnik_Blaz_2016.pdf 1 32684B96F30DA6F2F8D42CDD558E4385 c298761d80722db71c7283d2a2d1c509266d11b13d066677a2435216d03e3d50 366e4238-2fb6-11ef-a25b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186606 Biotehniška fakulteta 0 0 0