Sinteza in karakterizacija poliuretanskih premazov iz utekočinjene drevesne skorje : magistrsko delo

Jan, Nejc (author), Petrič, Marko (mentor), Pavlič, Matjaž (comentor), Poljanšek, Ida (reviewer)

V primarni predelavi lesa nastajajo večje količine odstranjene drevesne skorje, ki predstavlja pomemben neizkoriščen ostanek. Zato bi jo bilo v prihodnosti smotrno čim bolje izkoristiti, ne samo v energetske namene temveč predvsem v izdelkih z visoko dodano vrednostjo. Utekočinili smo skorjo smreke (Picea abies Karst.) in jo uporabili za pripravo poliuretanskih premazov za les. Skorjo smo utekočinili v glicerolu, zmesi polietilen glikola in glicerola ter v etilen glikolu. Pri nanosu se je najbolje obnesel premaz iz skorje, utekočinjene v zmesi polietilen glikola in glicerola. Poleg premaza iz skorje, utekočinjene v zmesi polietilen glikola in glicerola, smo za primerjavo okarakterizirali tudi komercialni poliuretanski premaz. Vse teste smo opravili po standardnih postopkih. Rezultati so pokazali nekoliko boljše lastnosti premaza iz utekočinjene drevesne skorje od lastnosti komercialnega poliuretanskega premaza, vendar na račun visokega deleža izocianata v premazu.

• Language: Slovenian
• Keywords: drevesna skorja, utekočinjenje, premazi za les, lastnosti premazov
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [N. Jan]
• Year: 2013
• Number of pages: VIII, 50 f.
• PID: 20.500.12556/RUL-122426
• UDC: 630*829.1
• COBISS.SI-ID: 2133897
• Publication date in RUL: 10.12.2020

Secondary language

• Language: English
• Title: Synthesis and characterization of polyurethane coatings from liquefied bark : M. Sc. thesis

Abstract

Primary wood processing results in formation of large amounts of removed bark, representing an important unused residue. In future, it would be more reasonable to use bark not only for energetic purposes, but above all in high added value products. Norway spruce (Picea abies Karst.) bark was liquefied and applied for preparation of polyurethane wood coatings. The bark was liquefied in glycerol, the mixture of polyethylene glycol and glycerol, and in ethylene glycol. The best results were obtained using the bark liquefied in the mixture of polyethylene glycol and glycerol. Just to compare, in addition to this coating, commercial polyurethane wood coating was also characterised. All characterisation tests were performed according to standard procedures. Compared to the properties of the commercial polyurethane finish, the results exhibited somewhat better properties of the liquefied bark based coating, due to higher content of isocyanate.

• Keywords: bark, wood liquefaction, wood coatings, characteristics of coatings