20.500.12556/RUL-117679 Vpliv sestave MUF lepilne mešanice in nanosa na strižno trdnost lepilnega spoja diplomski projekt The influence of the composition of the MUF adhesive mixture and application rate on the shear strength of the adhesive bond Raziskovali smo vpliv nanosa lepila in razmerja med lepilom in trdilcem na strižno trdnost lepilnega spoja. Preizkušali smo naslednje nanose: 250 g/m2, 300 g/m2, 350 g/m2 in 400 g/m2, razmerja med lepilom in trdilcem pa so bila: 100:20, 100:35, 100:60 in 100:100. Za testiranje smo uporabljali smrekov les (Picea Abies K). Pripravili smo deske z dimenzijami 600 mm x 120 mm x 32 mm, ki smo jih lepili z melamin-urea-formaldehidnim lepilom, ki se uporablja za lepljenje nosilcev. Lepili smo po tri deske skupaj, kar pomeni, da smo dobili dva lepilna spoja, katera smo testirali. Preizkušance smo naredili kot jih zahteva standard SIST EN 392. Preizkuse smo opravljali na testirnem stroju Zwick. Vse preizkušance smo vizualno ocenili in ugotovili, da je prišlo do 100-odstotnega loma po lesu, kar pomeni, da je lepilo zadostno penetriralo v les in zagotovilo dobro adhezijo med lepilom in lesom. Ugotovili smo, da so imeli vsi preizkušanci strižno trdnost več kot 6 N/mm2, kar je spodnja meja po standardu SIST EN 14080, 2013 We were studying the influence of application rate of adhesive and the ratio between the adhesive and hardener on the shear strength of adhesive bond. We tested the following application rates: 250 g/m2, 300 g/m2, 350 g/m2, and 400 g/m2; the ratios between the adhesive and the hardener were: 100:20, 100:35, 100:60 and 100:100. For testing, we used spruce wood (Picea Abies K). We prepared lamellas with dimensions 600 mm x 120 mm x 32 mm, which we bonded with a melamine-urea-formaldehyde glue, which is used for bonding laminated beams. We glued three lamellas together to obtain two adhesive joints, which were tested. The samples were made as according to standard EN 14080, 2013. The tests were performed on Zwick testing machines. All the test pieces were visually evaluated and it was determined that there was a 100 % fracture of wood, which means that the adhesive is sufficiently penetrated in the timber and ensures a good adhesion between the adhesive and the wood. We determined that all the specimens had shear strength of more than 6 N/mm2, which is the lower limit of the standard SIST 14080, 2013. lepljenje melamin-urea-formaldehid nanos lepila razmerje lepila in trdilca bonding melamine-urea-formaldehyde applying adhesive ratio of adhesive and hardener true false false [M. Papež] Slovenski jezik Angleški jezik Delo diplomskega projekta/projektno delo 2020-07-20 14:36:26 2020-07-20 14:36:29 2022-08-30 03:59:34 0000-00-00 00:00:00 2015 0 Ljubljana 2015 Ljubljana VIII, 41 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*824.831 2475913 DIP_Papez_Matevz_2015.pdf DIP_Papez_Matevz_2015.pdf 1 3BFAE4E4779F2F6B78B5E941AB7D4DC3 02d7215066a6bfbe49f4a157afd899c5024d0c33b96bb40b1873cdc83f6b08ef 3ce436f4-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=131566 Biotehniška fakulteta 0 0 0