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Evaluation of urea-formaldehyde adhesives performance by recently developed mechanical tests

机译：通过最近开发的机械测试评估脲醛胶粘剂的性能

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摘要

In the open literature, two main strategies can be found for synthesizing urea-formaldehyde (UF) resins. One is the alkaline-acid process, which takes place in three steps, usually an alkaline methylolation followed by an acid condensation and then the addition of a final amount of urea. The other process consists of four steps, the main difference being an initial condensation in strongly acid environment. In this work, we evaluate the curing behaviour of four resins produced using the aforementioned processes by the Integrated Pressing and Testing System (IPATES) and the Automated Bonding Evaluation System (ABES). The characterisation of the bond strength development during hot pressing by ABES and IPATES shows that the four resins will have different performances in the bonding process of wood-based composites. For each resin, the effect of pressing parameters such as temperature, adhesive and hardener ratios on shear strength (ABES) and internal bond (IPATES) during hot pressing is put into evidence.
机译：在公开的文献中，可以找到两种主要的合成脲醛（UF）树脂的策略。一种是碱-酸过程，该过程分三个步骤进行，通常是碱性羟甲基化，然后进行酸缩合，然后添加最终量的尿素。另一个过程包括四个步骤，主要区别在于在强酸环境下的初始冷凝。在这项工作中，我们通过综合压制和测试系统（IPATES）和自动粘合评估系统（ABES）对使用上述方法生产的四种树脂的固化性能进行评估。 ABES和IPATES对热压过程中粘合强度发展的表征表明，四种树脂在木质复合材料的粘合过程中将具有不同的性能。对于每种树脂，热压过程中诸如温度，粘合剂和硬化剂比例等压制参数对剪切强度（ABES）和内部粘结（IPATES）的影响均得到证明。

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