20.500.12556/RUL-158795 Lepljenje lesa z uporabo novih materialov in tehnik diplomsko delo - visokošolski strokovni študij Adhesive bonding of wood using new materials and techniques graduation thesis - higher professional studies V diplomskem delu smo raziskovali možnost uporabe utekočinjenega lesa kot materiala za izdelavo lepil. Les topola smo utekočinili na podlagi že raziskanih postopkov utekočinjenja s pomočjo glicerola kot reagenta za utekočinjanje ter žveplove (VI) kisline kot katalizatorja. Prvi del raziskave je obsegal optimizacijo utekočinjenja, drugi pa spremljanje utrjevanja utekočinjenega lesa v kombinaciji z dodatki lepil. Utrjevanje lepilnih mešanic smo spremljali z določanjem reoloških lastnosti na reometru ter z merjenjem dielektričnih lastnosti lepila med utrjevanjem v stiskalnici. Z izbranimi mešanicami utekočinjenega lesa (UL) in fenolformaldehidnega (FF) lepila smo zlepili preizkušance pri različnih časih stiskanja ter testirali strižno trdnost in ocenili delež loma po lesu. Rezultati so pokazali, da lahko za lepljenje lesa uporabimo FF lepilo, ki mu dodamo majhen delež UL, in tako izboljšamo strižno trdnost lepilnih spojev ter odpornost proti vlagi oziroma vodi. Če pri lepljenju uporabimo večji delež UL kot FF, lahko lepljence uporabimo samo v suhih pogojih. In the thesis paper the possibility of using liquefied wood as a material for manufacturing adhesives was researched. Poplar wood was liquefied; the process based on already investigated liquefaction processes using glycerol as the reagent for the liquefaction and the sulfuric acid (VI) as a catalyst. The first part of the study included the optimization of the liquefaction, and the second part monitoring the hardening of liquid timber in combination with the adhesive additives. The hardening of adhesive mixtures was monitored by determining the rheological properties of the rheometer and by measuring the dielectric properties of the adhesive during curing in a press. The selected mixtures of liquefied wood (LW) and phenol-formaldehyde (PF) glue were used to glue test pieces at different times of compression followed by testing the shear strength and the assessment of the proportion of wood fracture. The results showed that for gluing wood PF glue with the addition of a small proportion of LW can be used and thus improve the shear strength of the adhesive joints as well as the resistance to moisture or water. If for gluing a higher proportion of LW as PF is used, the bonded blocks can be used only in dry conditions. utekočinjen les fenol formaldehidno lepilo utrjevanje strižna trdnost liquefied wood phenol-formaldehyde adhesive curing shear strenght true false false A. Ciber Slovenski jezik Angleški jezik Diplomsko delo 2024-06-20 13:14:02 2024-06-20 13:14:04 2024-07-05 03:21:29 0000-00-00 00:00:00 2016 0 Ljubljana 2016 Ljubljana X, 38 f., [8] f. pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*824.89 2640777 UNI_Ciber_Ales_2016.pdf UNI_Ciber_Ales_2016.pdf 1 A189B12CB21E82591C211F4686A2F1C4 a0de52fb12fc07122c5d30cd27854d7c449004d972de53508a9ea27c44a05fb8 34d31969-2ef6-11ef-a73e-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186517 Biotehniška fakulteta 0 0 0