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首页> 外文期刊>Journal of Applied Polymer Science >Acetal-induced strength increases and lower resin content of MUF and other polycondensation adhesives
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Acetal-induced strength increases and lower resin content of MUF and other polycondensation adhesives

机译：缩醛引起的强度增加，MUF和其他缩聚粘合剂的树脂含量降低

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摘要

Acetals such as methylal and ethylal are shown to be particularly effective additives in improving the strength of wood boards bonded with melamine-urea-formaldehyde (MUF) resins, although they show some appreciable but lesser effect on other resins too, particularly phenol-formaldehyde resins. They equally allow a considerable decrease in resin loading, and thus, in melamine content, on the bonded wood panel and at parity of performance. Their development as additives is then primarily, but not only, targeted at the MUF adhesive resins. One-third decreases in MUF adhesives loading at parity of performance or equally internal bond (IB) strength increases approximately up to 50% by addition of methylal are shown to be possible by laboratory particleboard as well as by thermomechanical analysis (TMA). The reasons for methylal and ethylal behavior were studied by a variety of techniques, including liquid- and solid-phase C-13-NMR and could be mostly ascribed to the increased effectiveness and participation of the melamine to resin crosslinking due to its now preferentially homogeneous rather than heterogeneous reactions, consequences of the increased solubility in water afforded by the acetal cosolvents. (C) 2002 Wiley Periodicals, Inc. [References: 25]
机译：缩醛，如甲缩醛和乙缩醛，在提高与三聚氰胺-脲-甲醛（MUF）树脂粘合的木板的强度方面显示出特别有效的添加剂，尽管它们对其他树脂（尤其是酚醛树脂）也显示出可观但较小的作用。它们同样可以使粘合木板上的树脂负载量和三聚氰胺含量显着降低，且性能相当。因此，它们作为添加剂的开发主要但不仅限于MUF粘合剂树脂。通过实验室刨花板和热机械分析（TMA）可以证明，通过添加甲缩醛，MUF胶粘剂的负载量按性能相当降低了三分之一，或者内部键合（IB）强度平均提高了约50％，这是可能的。甲基和乙基行为的原因已通过多种技术进行了研究，包括液相和固相C-13-NMR，并且可能主要归因于三聚氰胺的优先选择，因为三聚氰胺具有更高的均质性和参与树脂交联的能力。而不是非均相反应，是乙缩醛助溶剂在水中溶解度增加的结果。 （C）2002 Wiley Periodicals，Inc. [参考：25]

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