Effects of Additives on Urea Formaldehyde Adhesives

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  • ユリア樹脂接着剤に及ぼす添加剤の影響

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The effects of additives on urea-formaldehyde (UF) rosin adhesives were evaluated by the performance of UF resin adhesives, that is, the mechanical properties of particle boards made glued with mixtures of UF resin and additives were determined and the thermal behaviors of those glue mixtures were analyzed by differential scanning calorimetry (DSC) to evaluate the effect of additives on the gluability and curing properties. Additives such as fibrous cellulose powder, aramid staple, and steam-exploded beech powder (SE) were used. Particle boards bonded with a glue mixture of UF resin and additives, especially in the case of an adhesive containing 30%SE, 30% cellulose powder, or 10% aramid staple, showed better performance than those bonded with UF resin alone. On DSC analyses, exothermal peaks due to the polymerization of adhesives moved to a slightly higher temperature with the addition of SE, but was almost unchanged with additives other than SE.

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