Study of glycidyl ether as a new kind of modifier for urea-formaldehyde wood adhesives

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[1] Ye, Jun

[2] Qiu, Teng

[3] Wang, Haiqiao

[4] Guo, Longhai

[5] Li, Xiaoyu

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Li, Xiaoyu | 1600年 / John Wiley and Sons Inc, Postfach 10 11 61, 69451 Weinheim, Boschstrabe 12, 69469 Weinheim, Deutschland, 69469, Germany卷 / 128期

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In this work; the multiepoxy functional glycidyl ether (GE) modified urea-formaldehyde (UF) resins were synthesized via a traditional alkaline-acid process under low formaldehyde/urea (F/U) molar ratio. The synthesized resins were characterized by 13C magnetic resonance spectroscopy (13C-NMR); indicating that GE can effectively react with UF resins via the ring-opening reaction of epoxy groups. Moreover; the residual epoxy groups of GE could also participate in the curing reaction of UF resins; which was verified by Fourier transform infrared spectroscopy. The storage stability of GE-modified UF resins and the thermal degradation behavior of the synthesized resins were evaluated by using optical microrheology and thermogravimetric analysis; respectively; Meanwhile; the synthesized resins were further employed to prepare the plywood with the veneers glued. For the modification on bonding strength and formaldehyde emission of the plywood; the influences of addition method; type; and amount of GE were systematically investigated. The performance of UF adhesives were remarkably improved by the modification of GE around 20-30% (weight percentage of total urea) in the acidic condensation stage during the resin synthesis. © 2012 Wiley Periodicals; Inc;

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Journal article (JA)

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