Abstract
Effects of wollastonite nanofibers on fire-retarding properties of medium density fiberboard were studied. Nanowollastonite (NW) was applied at 5, 10, 15, and 20 g/kg dry weight basis of wood fibers and compared with reference specimens. Two application methods of NW were used: surface application (SA), and internal application. Density was kept constant at 670 kg/m3 for all treatments. Specimens of 150 × 130 × 9 mm³ were prepared and fire-retarding properties were measured using two devices: slide fire test device and fixed fire test device. The properties included: weight loss, ignition and glowing times, width and length of the burnt area, and fire endurance. The obtained results indicated that most fire-retarding properties were significantly improved with the increase in NW-content up-to 15 %, including weight loss, ignition and glowing times, and fire endurance. Higher amounts resulted in decreasing of the properties which was partly due to the less fiber-content, and partly due to the absorption of resin by the wollastonite nanofibers. It can be concluded that SA of NW is more effective in improving fire-retarding properties of medium density fiberboard. Furthermore, 10 % of NW is recommended as an optimum level of consumption.
Zusammenfassung
Untersucht wurde der Einfluss von Wollastonit-Nanofasern auf die feuerhemmenden Eigenschaften von mitteldichten Faserplatten. Nano-Wollastonit wurde in den vier Dosierungen 5, 10, 15 und 20 g/kg Spantrockengewicht in zwei verschiedenen Varianten (mit dem Klebstoff vermischt in der Platte oder auf die Oberfläche aufgesprüht) zugegeben und mit Kontrollplatten verglichen. Die Dichte wurde bei allen Platten mit 670 kg/m³ konstant gehalten. Prüfkörper mit den Abmessungen 150 × 130 × 9 mm³ wurden hergestellt und die feuerhemmenden Eigenschaften Masseverlust, Entzündungs- und Glimmzeit, Breite und Länge der verbrannten Stelle sowie Nachbrenndauer wurden an einer Vorrichtung mit beweglicher Beflammung und einer Vorrichtung mit fester Beflammung bestimmt. Die Ergebnisse zeigten, dass die meisten der feuerhemmenden Eigenschaften einschließlich Masseverlust, Entzündungs- und Glimmzeit sowie Nachbrenndauer mit zunehmendem Nano-Wollastonit-Anteil bis 15 % signifikant verbessert wurden. Bei einem höheren Nano-Wollastonit-Anteil verschlechterten sich die Eigenschaften, was teilweise auf den geringeren Faseranteil sowie der Bindung des Harzes an die Wollastonit-Nanofasern zurückgeführt wird. Beim Aufbringen von Nano-Wollastonit auf die Oberfläche wurden die feuerhemmenden Eigenschaften der mitteldichten Faserplatten stärker verbessert. Als optimale Menge wird eine Zugabe von 10 % Nano-Wollastonit empfohlen.
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Acknowledgments
The authors are grateful to Mr. Mohammad Aieni, the managing director, and Engin. Mohammad Taghi Kazemi, the production manager, of Sanaye Choobe Khazar Co. (MDF Caspian Khazar, http://www.choobekhazar.com), for procurement of the necessary fiber and raw materials for the present research project. We also appreciate Mr. Mohammad Hossein Vardi, the managing director of Vard Manufacturing Company of Mineral and Industrial Products, for preparation of NanoWollastonite. The authors are also grateful to Mr. Majid Ghazizadeh, the internal sales manager of Pars Chemical Industries Company, for the procurement of the resin for the present study.
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Taghiyari, H.R., Rangavar, H. & Nouri, P. Fire-retarding properties of nanowollastonite in MDF. Eur. J. Wood Prod. 71, 573–581 (2013). https://doi.org/10.1007/s00107-013-0711-6
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DOI: https://doi.org/10.1007/s00107-013-0711-6