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FURAN RESINS AS POTENTIAL STRUCTURAL ADHESIVES FOR WOOD

机译：FURAN树脂作为木材的潜在结构粘合剂

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摘要

The adhesives compositions for wood gluing have to complied special requirements to be called structural adhesives. Three adhesive compositions based on polycondensation, namely an urea- formaldehyde adhesive, a mixed furan resin and a mixture of these in equal proportions, were tested in terms of their compliance to the requirements imposed for structural adhesives by SR EN 301:2006 and their classification as type I or type II based on their expected performance in service in different specified environmental conditions. Two tests were employed for this purpose: determination of the influence of acid attack on the wood fibres on the transverse tensile strength and the determination of the effects of wood shrinkage on gluing strength. The results shown that: the adhesive composition based on urea formaldehyde resin, included in this research only as a reference, does not comply to the requirements for structural adhesives, the mixed furan resin complies entirely to the requirements for structural adhesives of type I. The adhesive composition based on mixture equal proportion of these resin demonstrated a significantly improved performance compared to the reference urea- formaldehyde adhesive, but could not reach the requirements for the structural adhesives. However, it shown a much better resistance to climatic cyclic aging compared to the UR reference, which clearly demonstrates the positive effect of the mixed furan resin.
机译：用于木材胶合的粘合剂组合物必须符合特殊要求，称为结构粘合剂。根据SR EN 301：2006对结构胶粘剂的要求及其分类，对三种基于缩聚的胶粘剂组合物进行了测试，即脲醛胶，混合呋喃树脂和它们的等比例混合物。根据I型或II型在不同的特定环境条件下的预期服务性能而定。为此，进行了两个测试：确定酸对木材纤维的侵蚀对横向拉伸强度的影响以及确定木材收缩对胶合强度的影响。结果表明：本研究仅包括基于尿素甲醛树脂的胶粘剂组合物，不符合结构胶粘剂的要求，混合呋喃树脂完全符合I型结构胶粘剂的要求。与参考脲醛甲醛胶粘剂相比，基于这些树脂的混合物等比例混合的胶粘剂组合物表现出显着改善的性能，但无法达到结构胶粘剂的要求。但是，与UR参考相比，它具有更好的耐气候循环老化性能，这清楚地证明了混合呋喃树脂的积极作用。

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