Film Properties and Wood Bonding Performance of Acrylic Emulsion Adhesives with Different Glass Transition Temperature through Addition of Acetoacetylated PVA and pMDI

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  • アセトアセチル化PVAとpMDIをブレンドしたガラス転移点の異なるアクリル樹脂エマルションのフィルム物性と木材接着性能

Abstract

<p>In this study, we produced aqueous vinyl polymer solution-isocyanate adhesives for wood (API) experimentally by mixing acrylic emulsion adhesives (AE) with different glass transition (Tg), acetoacetylated polyvinyl alcohol (AAPVA) and polymeric diphenylmethane diisocyanate (pMDI) to improve the adhesive performance of the adhesives added to wood-based materials for their vibration-damping properties. The relationship between film properties and wood bonding performance was investigated with regard to dynamic viscoelasticity and moisture absorption by the adhesive films, tensile shear strength, and wood failure rate using three-layer plywood. As a result, the decrease of the storage elastic modulus (E ') in high-temperature ranges was suppressed by adding AAPVA and pMDI in dynamic viscoelasticity. Additionally, AE with Tg near room temperature showed the highest values of tensile shear strength of the joints. Wood bonding performance was considerably improved by adding AAPVA and pMDI to AEs. Furthermore, the relationships between E ' and tensile shear strength of the joints were investigated, and an approximation curve based on a polynomial equation showed a strong correlation, with a coefficient of determination R 2 = 0.876.</p>

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 69 (3), 125-133, 2023-07-25

    The Japan Wood Research Society

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