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http://dx.doi.org/10.5658/WOOD.2019.47.5.579

Effect of Synthesis Method and Melamine Content of Melamine-Urea-Formaldehyde Resins on Bond-Line Features in Plywood  

LUBIS, Muhammad Adly Rahandi (Department of Wood and Paper Sciences, Kyungpook National University)
JEONG, Bora (Department of Wood and Paper Sciences, Kyungpook National University)
PARK, Byung-Dae (Department of Wood and Paper Sciences, Kyungpook National University)
LEE, Sang-Min (Wood Utilization Division, National Institute of Forest Science)
KANG, Eun-Chang (Wood Utilization Division, National Institute of Forest Science)
Publication Information
Journal of the Korean Wood Science and Technology / v.47, no.5, 2019 , pp. 579-586 More about this Journal
Abstract
This work examined effects of the synthesis method and melamine content of melamine-urea-formaldehyde (MUF) resins on the bond-line features (i.e. resin penetration and bond-line thickness) in plywood. Two synthesis methods (MUF-A and MUF-B) and three melamine contents (5, 10, and 20%) were employed to prepare MUF resins. The MUF-A resins at three melamine contents were prepared by a simultaneous reaction of melamine, urea, and formaldehyde, while the MFU-B resins were prepared by reacting melamine at the same levels with formaldehyde followed by urea. The results showed that higher melamine content increased the viscosity of MUF-A and MUF-B resins. The resin penetration of MUF-A resins decreased by 48% while those of MUF-B resins increased by 16% at 20% melamine content. As a result, the MUF-A resins had greater bond-line thickness than those of MUF-B resins as the melamine content increased. The MUF-B resins resulted in thinner bond-line and greater resin penetration compared to those of MUF-A resins. The results suggested that MUF-B resins prepared with 20% melamine content had a proper combination of resin penetration and bond-line thickness that could produce plywood panel with a better adhesion performance.
Keywords
MUF resins; bond-line thickness; resin penetration; light microscopy; plywood;
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Times Cited By KSCI : 10  (Citation Analysis)
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