Evaluation of Commercially Available Polyurethane Resin to Develop Non-biocidal Wood Preservation Treatments

IRG/WP 16-40751

M Mubarok, Y Sudo Hadi, J Suryana, I W Darmawan, F Simon, S Dumarcay, C Gérardin, P Gérardin

Evaluation of commercially available polyurethane (PU1 and PU2 and polyisocyanate (PNCO) to develop non-biocidal wood preservation treatments have been conducted. A simple method by vacuum impregnation of these resins into beech wood (Fagus sylvatica L) and pine wood (Pinus sylvestris L.) samples followed by varied curing process at ambient temperature, 103oC, and 200oC have been performed. Based on the analysis of weight percent gain before (WPG) and after leaching (WPGAL), percentage of leaching (PL), anti swelling efficiency (ASE), wettability (contact angle method), Brinell hardness (H) of beech wood, spectroscopy analysis by FTIR and 13C NMR, and decay durability by percentage of masse loss (ML) of treated and untreated blocks after leaching against white-rot fungus (Coriolus versicolor/CV) for both wood species and brown-rot fungus (Poria placenta/PP and Gloeophyllum trabeum/GT) for pine wood, it can be concluded that PU120% followed with PNCO10% system can be considered as a valuable non-biocidal treatment. The system gave WPG, WPGAL, PL, ASE, wettability, H, and ML by CV, PP, GT respectively at 103oC curing condition are 24.1 ± 1.9%, 19.6 ± 2.5%, 3.1 ± 0.2%, 51.4 ± 4.9%, 54o(60st), 4.91 (T)/3.89 (R) N/mm2, 9.9 ± 5.1% (CV) for beech wood and 13.1 ± 2.8%, 9.8 ± 2.4%, 2.7 ± 0.3%, 47.3 ± 1.2%, 39.4o(60st), 1.3 ± 0.2% (CV), 0.0 ± 0.2%(PP), 1.8 ± 1.1%(GT) for pine wood. A PU2 20% followed with PNCO 10% system could also be used as non-biocidal wood preservative in place where the variation of humidity is low and on non ground contact area.


Keywords: polyurethane, Fagus sylvatica, Pinus sylvestris, non-biocide, preservative

Conference: 16-05-15/19 Lisbon, Portugal


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