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http://dx.doi.org/10.5658/WOOD.2019.47.2.200

Performance of Hybrid Adhesives of Blocked-pMDI/Melamine-Urea-Formaldehyde Resins for the Surface Lamination on Plywood  

Lubis, Muhammad Adly Rahandi (Department of Wood and Paper Sciences, Kyungpook National University)
Park, Byung-Dae (Department of Wood and Paper Sciences, Kyungpook National University)
Lee, Sang-Min (Department of Forest Products, National Institute of Forest Science)
Publication Information
Journal of the Korean Wood Science and Technology / v.47, no.2, 2019 , pp. 200-209 More about this Journal
Abstract
To improve the water resistance of melamine-urea-formaldehyde (MUF) resins, different levels of blocked polymeric 4,4 diphenyl methane diisocyanate (B-pMDI) were blended with MUF resins to prepare B-pMDI/MUF hybrid adhesives, and their adhesion performances were evaluated for the surface lamination of fancy veneer on plywood. FT-IR spectra showed that the de-blocked -NCO groups reacted with the -OH of hydroxymethyl groups of the MUF resins to form urethane bonds at 2% B-pMDI/MUF, which was detected before and after their hydrolysis. The mass loss after the hydrolysis consistently decreased as the B-pMDI level increased, indicating an improvement in the water resistance. As the B-pMDI level increased, the activation energy of hybrid adhesives decreased, which improved the reactivity of the hybrid adhesives. Additionally, the water resistance improvement of the hybrid adhesives increased the tensile shear strength of the surface laminated plywood in semi-water proof and water-proof by 23 % and 8 %, respectively, at 2% B-pMDI level. This was likely due to the urethane linkages in the hybrid adhesives. However, the formaldehyde emission from plywood panels bonded with the hybrid adhesives increased in the dry state, indicating incomplete curing of the hybrid adhesives.
Keywords
blocked pMDI; MUF resins; plywood; surface lamination; water resistance;
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Times Cited By KSCI : 4  (Citation Analysis)
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