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Poliuretanski premazi za les iz utekočinjenega lesa : diplomsko delo - univerzitetni študij = Polyurethane wood coatings from liquefied wood : graduation thesis - university studiesBradeško, DavorinPotreba po proizvodih, narejenih iz obnovljivih virov, v sodobnem svetu vse bolj narašča. Utekočinjen les (UL) je dokaj nova obnovljiva surovina, katero je možno uporabiti tudi za izdelavo ... poliuretanskih premaznih sredstev. Topolovino smo utekočinjali v reagentu dietilen glikolu (DEG) pri masnem razmerju med lesom in reagentom v razmerju 1:5. Kot katalizator reakcije (95 min, 150 °C - 180 °C) smo dodali 3 % H2SO4 glede na maso DEG. Produkt, iz katerega smo odstranili večino nezreagiranega DEG, smo razredčili z destilirano vodo v razmerju 1:3. Primerno formulacijo premaza smo določili s preizkušanjem kombinacij med vodno disperzijo UL, izocianatnim utrjevalcem (IZ) YCM402 in katalizatorji, ki se uporabljajo v klasičnih poliuretanskih (PU) premaznih sredstvih. Kombinacijo premaznega sredstva, ki je našim kriterijem najbolje ustrezala, smo na leseno površino nanesli s tehniko zračnega brizganja in lastnosti površinskega sistema nato primerjali z lastnostmi komercialno dostopnega PU sredstva na vodni osnovi. Analiza FT-IR je potrdila nastanek uretanske strukture in vodikovih vezi pri utrjenih sistemih iz vodne disperzije UL. Površinskim sistemom smo med utrjevanjem merili trdoto površine po metodi z dušenim nihanjem (SIST ISO 1522), po 21 dneh utrjevanja pa določili še prožnost po Petersu (DIN 53 155:1971), oprijemnost po metodi z odtrgovanjem pečatov (SIST EN ISO 4624), sijaj (SIST EN ISO 2813) in barvo (CIE-L*a*b* sistem vrednotenja barv). Ugotovili smo, da so bile odpornostne lastnosti izbranega sistema UL:IZ (1:1) primerljive s komercialnim premazom YOM750 pri izpostavitvi nekaterim hladnim tekočinam (SIST EN 12720) in suhi toploti (SIST EN 12722). Premazni sistem je bil sicer slabše odporen proti vodi ter delovanju mokre toplote (SIST EN 12721), vendar je izkazoval precej boljšo odpornost proti acetonu in razenju površine (SIST EN ISO 1518).Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [D. Bradeško], 2012Language - slovenianCOBISS.SI-ID - 2073481
Author
Bradeško, Davorin
Other authors
Petrič, Marko, 1962- |
Poljanšek, Ida
Topics
utekočinjen les |
poliuretanski premazi |
FT-IR |
odpornostne lastnosti |
liquefied wood |
polyurethane coating |
FT-IR |
resistance properties
Library/institution |
City | Acronym | For loan | Other holdings |
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BF, Department of Wood Science and Technology, Lj. | Ljubljana | BFLES |
reading room 1 cop.
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Shelf entry
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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DRS, in which the journal is indexed
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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Bradeško, Davorin | |
Petrič, Marko, 1962- | 00395 |
Poljanšek, Ida | 12041 |
Source: Personal bibliographies
and: SICRIS
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