1. 1,3-Dimethylol-4,5-dihydroxyethyleneurea as a Potential Alternative Binder for Plywood.
- Author
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Kong, M. T., Lim, T. W., Król, P., Auriga, R., and Mamiński, M. ł.
- Subjects
UREA compounds ,BINDING agents ,PLYWOOD ,FORMALDEHYDE ,SHEAR strength ,ELASTIC modulus measurement ,FLEXURAL strength - Abstract
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°C, 140°C, and 160°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°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–1which complied with standards for interior grade plywood. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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