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| PDF : |  08020062.pdf |
| title(En) : | The Study of Wood Adhesives. I. The Effect of Melamine to Fortify Urea-Formaldehyde Resin Adhesive |
| author(En) : | Rinhachi Yanagawa, Osamu Matsumura |
| information : | Mokuzai Gakkaishi 8(2), 62-67 (1962) |
| assort : | Original Article |
| summary(En) : | The subject of this report is to decide to what extent melamine fortifies the wood adhesive of U-F-resin. The results are as follows: 1) Melamine fortifies the wet shear strength of plywood, especially its durability in boiling water. 2) But an excess of melamines added in resin reduces the shear strength of plywood, that is, the optimun content of melamine needed to get the maximum strength is nearly in proportion to that of uncondensated formaldelyde in U-F-resin. 3) Then it is permitted that the cohesion in cured adhesive is so fortified that the increasing of swelling degree of cured resin is defended by added melamine. 4) As a fortified adhesive, urea-melamine-formaldehyde co-condensated resin is more effective than the addition of crystalline melamine, trimethylol melamine in adhesive solution. Most of the above results are obtained by the method of measuring the shear strength of plywood, tensile strength and swelling degree of cured resin-film in the case of immersion in water under various conditions. |