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Utrjevanje lepilnih mešanic iz utekočinjenega lesa in urea-formaldehidnega lepila : diplomski projekt
Žigon, Jure (Author), Šernek, Milan (Mentor) More about this mentor... This link opens in a new window, Petrič, Marko (Reviewer)

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Abstract
Les smo utekočinili z uporabo etilen glikola in žveplove(VI) kisline. Pripravili smo lepilne mešanice z različnimi deleži utekočinjenega lesa (UL) in urea-formaldehidnega (UF) lepila in izmerili čas do začetka želiranja. Z diferenčno dinamično kalorimetrijo in reometrom smo spremljali proces utrjevanja izbranih lepilnih mešanic. Opravili smo tudi preizkuse strižne trdnosti lepilnih spojev, narejenih iz predhodno proučevanih lepilnih mešanic. Rezultati so nam podrobneje pokazali, pri kateri temperaturi se je začelo želiranje posamezne lepilne mešanice in procese, ki so se pojavili v lepilnih mešanicah pri višjih temperaturah. Najkrajše čase želiranja so dosegle lepilne mešanice z dodatkom UL pri 30 % in 40 %. Želiranje lepilnih mešanic se je pričelo v temperaturnem območju med 95 °C in 135 °C, UF lepilo pa je s komponentami UL reagiralo pri temperaturah med 135 °C in 190 °C. Najvišjo strižno trdnost je dosegel lepilni spoj, narejen z lepilno mešanico iz 10 % UL in 90 % UF lepila.

Language:Slovenian
Keywords:diferenčna dinamična kalorimetrija, reološke lastnosti, strižna trdnost, utekočinjen les, urea-formaldehidno lepilo
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2012
Publisher:[J. Žigon]
Number of pages:IX, 49 f.
Place:Ljubljana
UDC:630*824.86
COBISS.SI-ID:2043273 Link is opened in a new window
Views:799
Downloads:199
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Secondary language

Language:English
Title:Curing of adehsive mixtures of liquefied wood and urea-formaldehyde adhesive : B. Sc. thesis
Abstract:
We liquefied wood using ethylene glycol and sulphuric(VI) acid. We prepared adhesive mixtures with different proportions of liquefied wood (LW) and urea-formaldehyde (UF) adhesive, and measured the time to start gelling. Using differential scanning calorimetry and rheometer we monitored the process of curing of the selected adhesive mixtures. To confirm the results we passed the test of shear strength of adhesive joints made from previously studied adhesive mixtures. The results show in detail at which temperature gelling starts for each of adhesive mixtures and processes that occur in adhesive mixtures at higher temperatures. The mixtures containing 30 % and 40 % LW, reach the minimum gelling times. The adhesive mixtures start gelling in the temperature range between 95 °C and 135 °C, UF adhesive reacted with the LW components at temperatures between 135 °C and 190 °C. The maximum shear strength reached the adhesive bond made with an adhesive mixture of 10 % LW and 90 % UF adhesive.

Keywords:differential scanning calorimetry, rheological characteristics, shear strength, liquefied wood, urea-formaldehyde adhesive

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