1,3-Dimethylol-4,5-dihydroxyethyleneurea as a Potential Alternative Binder for Plywood

摘要

Two types of commercial 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) resins were used for the first time as the binders in 3-ply plywood manufacturing. The studies were aimed at the assessment of the applicability of DMDHEU as substitute for widely used urea-formaldehyde (UF) resins. Applied press platen temperature was 120 degrees C, 140 degrees C, and 160 degrees C and pressing time was 300 s. The results indicate that the DMDHEU can be used as a binder for plywood. The mechanical properties: tensile shear strength, modulus of rupture (MOR), and modulus of elasticity (MOE) were determined - i.e., > 1.0, 75-90, and 11100-18000 MPa, respectively. It was found that platen temperature 120 degrees C was sufficient for the proper cure of the binder and to obtain dry shear strength that met the requirements of EN 310 standard. Formaldehyde release was 2.8 +/- 0.6 mg.m(-2).h(-1) which complied with standards for interior grade plywood.