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在非承载类硬木结构中使用水性热塑性胶粘剂,要求最终胶接接头具有较高的机械性能(高于木材本身)和抗蠕变性。当胶接接头受到静负荷作用时,其机械性能会受到胶粘剂本身性能和木材类型的影响,即与胶粘剂和基材之间密切相关。选取化学成分相同、合成路径不同的两类聚合物,并参照国际标准[1-2]对胶粘剂的相关性能进行光谱分析、量热分析、形态结构分析和测试。有趣的是,两例胶在剪切试验中表现出显著差异:一类导致被粘基材的内聚破坏,另一类导致被粘基材表面的胶粘剂破坏。由此可知,所测试聚合物所表现出的不同机械性能与粘接机理有关。因此,本文合成了新一代Vinavil水基聚合物胶粘剂,由于采用新颖的前瞻性技术,其特殊性能显而易见,且远超过传统标准。
The use of aqueous thermoplastic adhesives in non-load bearing hardwood structures requires that the final cements have high mechanical properties (above the wood itself) and creep resistance. When a static load is applied to a spliced joint, its mechanical properties are affected by the properties of the adhesive itself and the type of wood, which is intimately related to the adhesive and the substrate. Two kinds of polymers with the same chemical composition and different synthetic routes were selected and the related properties of the adhesive were analyzed by spectroscopy, calorimetry, morphological analysis and testing with reference to international standards [1-2]. Interestingly, the two gums showed significant differences in shear tests: one resulted in cohesive failure of the sticky substrate and the other resulted in damage to the adhesive on the sticky substrate surface. From this it can be seen that the different mechanical properties exhibited by the tested polymers are related to the bonding mechanism. Therefore, a new generation of Vinavil water-based polymer adhesives has been synthesized in this paper. Due to its novel and forward-looking technology, its special properties are obvious and well beyond the traditional standards.