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Preparation of two-component polyurethane coatings from bleached liquefied wood
Pori, Pavel (Author), Tavzes, Črtomir (Author), Hrastnik, David (Author), Budija, Franc (Author), Pavlič, Matjaž (Author), Petrič, Marko (Author), Cheumani-Yona, Arnaud Maxime (Author)

URLURL - Presentation file, Visit http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_10_2_3347_Cheumani_Yona_Polyurethane_Coatings_Liquefied_Wood This link opens in a new window

Abstract
Liquefied wood-based polyurethane wood coatings of an aesthetically acceptable light colour were prepared and characterised. Liquefied black poplar wood was obtained by solvolysis in a polyethylene glycol/glycerol mixture, and it was bleached with hydrogen peroxide. The bleaching treatment converted liquefied wood from a dark brown to a yellowish product. Polyurethane films were prepared by the curing of liquefied wood with polymeric diphenylmethane diisocyanate or trimethylolpropane toluene diisocyanate prepolymer (TMP/TDI) isocyanate-type hardeners. It was found that the selected properties of the films prepared from the bleached liquefied wood were, in general, equivalent to those prepared from unbleached liquefied wood. The mechanical properties of the films obtained with the TMP/TDI curing agent were acceptable for wood coating applications. The initial poor resistance of the films to water and ethanol was substantially improved by the addition of n-octyltriethoxysilane to the liquefied wood prior to the preparation of the polyurethane coatings; the hardness of the films also increased.

Language:English
Keywords:utekočinjen les, poliuretanski premaz, les, beljenje
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2015
Number of pages:Str. 3347-3363
Numbering:Vol. 10, iss. 2
UDC:630*8
ISSN on article:1930-2126
COBISS.SI-ID:2375049 This link opens in a new window
Views:803
Downloads:300
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Record is a part of a journal

Title:Bioresources
Publisher:Dept. of Wood and Paper Science, College of Natural Resources, North Carolina State University
ISSN:1930-2126
COBISS.SI-ID:1618569 This link opens in a new window

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