Abstract
This paper presents a study on the potential use of high density polyethylene (HDPE) film as wood adhesive for formaldehyde-free plywood. The physical–mechanical properties of the plywood, including thickness swelling (TS), water absorption (WA), tensile shear strength, modulus of elasticity and modulus of rupture were evaluated. Results show that HDPE film dosage positively affects the properties when ranging from 61.6 to 246 g/m2. The performance of these panels was comparable to those of plywood made with commercial urea–formaldehyde (UF) resins. Comparisons of the dimensional stability between the two plywood demonstrated that 7-day TS and WA values of the panels bonded with UF resins were 5.10 and 23.5 % higher than those bonded with HDPE film, confirming the suitability of HDPE for the use as adhesive in wood-based composites intended for indoor applications subjected to high moisture. DMA tests show that HDPE bonded plywood was significantly inferior in thermal stability at 120 °C and above while it presented almost the same dynamic mechanical properties as UF plywood when the temperature was lower than 100 °C, making it suitable to be used as geothermal floor.
Zusammenfassung
In dieser Studie wird eine mögliche Verwendung von Hartpolyethylen-(HDPE) Folie als Klebstoff für die Herstellung von formaldehydfreiem Sperrholz untersucht. Die physikalisch-mechanischen Eigenschaften von Sperrholz, d.h. die Dickenquellung, die Wasseraufnahme, die Zugscherfestigkeit, der Elastizitätsmodul und die Biegefestigkeit wurden bestimmt. Die Ergebnisse zeigen, dass sich HDPE-Folie in einer Dosierungsmenge zwischen 61,6 und 246 g/m² positiv auf die Eigenschaften von Sperrholz auswirkt. Die Eigenschaften dieser Platten waren vergleichbar mit Sperrholz, das mit herkömmlichem Harnstoff-Formaldehydharz (UF) hergestellt wurde. Ein Vergleich der Dimensionsstabilität beider Sperrholzarten ergab, dass die 7-tägige Dickenquellung und die Wasseraufnahme bei den mit UF-Klebstoff gebundenen Platten um 5,10 bzw. 23,5 % höher waren als die entsprechenden Werte der mit HDPE gebundenen Platten, wodurch die Eignung von HTPE-Klebstoff für Holzwerkstoffe im Feuchtbereich bestätigt wurde. Eine Prüfung der dynamischen mechanischen Eigenschaften ergab, dass die Wärmebeständigkeit von mit HDPE gebundenem Sperrholz bei 120 °C und darüber signifikant niedriger als bei gebundenen Sperrholzplatten war, wohingegen sie bei Temperaturen unter 100 °C nahezu gleiche dynamische mechanische Eigenschaften aufwies. Damit können solche Platten bei Böden mit Fußbodenheizung verwendet werden.
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This work was supported by the special scientific research of the forest public welfare industry [grant number 201004004].
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Fang, L., Chang, L., Guo, Wj. et al. Preparation and characterization of wood-plastic plywood bonded with high density polyethylene film. Eur. J. Wood Prod. 71, 739–746 (2013). https://doi.org/10.1007/s00107-013-0733-0
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DOI: https://doi.org/10.1007/s00107-013-0733-0