BF, Dept. of Wood Technology, Lj. (BFLES)
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Kemijski in mehanski vidik utrjevanja urea-formaldehidnega lepila : diplomski projekt = Chemical and mechanical aspects of curing of urea-formaldehyde adhesive : B. Sc. thesisJeraj, MihaProučevali smo vpliv deleža katalizatorja in hitrost segrevanja na proces utrjevanja lepila, točneje na točko želiranja ter elastični strižni modul G'. Uporabili smo sintetično, polikondenzacijsko ... urea-formaldehidno lepilo (UF) tipa Prefere 10F102 s fizikalno-kemičnim načinom utrjevanja. Meritve smo izvedli z reometrom z oscilatorno metodo 2 vzporednih plošč ter diferenčno dinamično kalorimetrijo (DSC). Namen testiranja je bil iskanje morebitnih korelacij med rezultati obeh metod. Pri izvedbi eksperimenta z reometrom smo uporabili hitrosti segrevanja 5, 10 in 20 K/min in deleže katalizatorja 0,5 %,1 % , 2 % in 3 %. Kot katalizator smo uporabili 25 % vodno raztopino amonijevega sulfata. Temperaturni obseg testiranja pri reometru je bil od 30 do 95 °C, pri metodi DSC pa od 30 do 100 °C. Za določanje točke želiranja smo uporabili kriterij sečišča elastičnega strižnega modula G' in viskoznostnega strižnega modula G". Ugotovili smo, da z naraščanjem koncentracije utrjevalca in hitrosti segrevanja padata temperatura in čas točke želiranja UF lepila. Dokazali smo tudi, da so končne vrednosti modula G' približno enake ne glede na količino katalizatorja ali hitrost segrevanja. Z DSC "Model Free Kinetics" smo simulirali potrebne čase utrjevanja za doseganje določene stopnje utrjenosti UF lepila pri izbranih temperaturah.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [M. Jeraj], 2012Language - slovenianCOBISS.SI-ID - 2046345
Author
Jeraj, Miha
Other authors
Šernek, Milan |
Poljanšek, Ida
Topics
urea-formaldehid |
reometer |
DSC |
točka želiranja |
urea-formaldehyde |
rheometer |
DSC |
gelling point
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Knjižnica BF za lesarstvo dv1 0000000023 IN: 020120096 Knjižnica BF za lesarstvo dv1 23 IN: 020120096 |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Jeraj, Miha | |
Šernek, Milan | 16382 |
Poljanšek, Ida | 12041 |
Source: Personal bibliographies
and: SICRIS
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