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Kinetika utrjevanja poliestrskega lepila na osnovi utekočinjenega lesa : diplomsko delo - visokošolski strokovni študij
Pertnač, Marko (Author), Šernek, Milan (Mentor) More about this mentor... This link opens in a new window, Kunaver, Matjaž (Co-mentor), Poljanšek, Ida (Reviewer)

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Abstract
Proučevali smo kinetiko utrjevanja lepilnih mešanic iz melamin-urea-formaldehidnega lepila (MUF) in poliestrskega lepila na osnovi utekočinjenega lesa (PEST-UL). Pripravili smo lepilne mešanice z različnimi utežnimi deleži MUF in PEST-UL, katerih utrjevanje smo spreminjali z diferenčno dinamično kalorimetrijo (DSC). Vse lepilne mešanice smo segrevali s hitrostjo 10 °C min-1 v temperaturnem območju 25-400 °C. Ugotovili smo, da več kot je MUF lepilu dodanega PEST-UL, višja je temperatura prvega eksotermnega vrha. Z večanjem deleža PEST-UL v MUF lepilni mešanici, od razmerja MUF/PEST-UL = 90/10-50/50, se temperatura prvega eksotermnega vrha konstantno povečuje in sicer od 92,52-98,74 °C; temperatura drugega eksotermnega vrha pa se glede na konstantno povečanje deleža variabilno spreminja in sicer od 292-299 °C. Z DSC metodo smo podrobneje proučili lepilno mešanico MUF/PEST-UL = 70/30 pri 3 različnih hitrostih segrevanja: 5, 10 in 20 °C min-1. Iz simulacije utrjevanja lepilne mešanice pri dinamičnih temperaturnih pogojih z uporabo MFK smo predvideli čase utrjevanja pri dinamičnih temperaturnih pogojih do določene stopnje utrjenosti lepilne mešanice.

Language:Slovenian
Keywords:poliestrsko lepilo, utekočinjen les, kinetika utrjevanja, DSC, MFK
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2013
Publisher:[M. Pertnač]
Number of pages:IX, 34 f.
UDC:630*824.89:630*813.6
COBISS.SI-ID:2099081 Link is opened in a new window
Views:105
Downloads:58
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Secondary language

Language:English
Title:Kinetics of curing of polyester adhesive based on liquefied wood
Abstract:
Thesis studies the curing kinetics of different adhesive mixtures from melamin-urea-formaldehyde adhesive (MUF) and polyester adhesive based on liquefied wood (PEST-UL). We prepared the adhesive mixtures with different proportions of MUF and PEST-UL mixture and noted the difference of differential dynamic calorimetry (DSC). All the adhesive mixtures were then heated with the speed of 10 °C min-1 within the temperature range of 25-400 °C. We found out that more PEST-UL adhesive added to the MUF adhesive increases the temperature of the first exothermic peak. By increasing the percentage of PEST-UL in MUF mixture the temperature of the first exothermic peak is constantly increasing with the ratio of 90/10-50/50 to the temperature of 92,52-98,74 °C, while the temperature of the second exothermic peak considering the constant increase of the proportion changes variably from 292-299 °C. Research also focuses on studying the adhesive mixture MUF/PEST-UL = 70/30 with the DSC method by different heating rate: 5, 10 and 20 °C min-1. By simulating the curing of the adhesive mixture in dynamic temperature conditions using MFK, the curing times at dynamic temperature conditions is attainted until certain degree of cure of adhesive mixture.

Keywords:polyester adhesive, liquefied wood, curing kinetics, DSC, MFK

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