HDPE 胶合板与脲醛树脂胶合板的性能对比
Performance comparison of HDPE plywood with UF resin plywood
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摘要: 为了探讨高密度聚乙烯(HDPE)薄膜替代脲醛(UF)树脂作为胶黏剂的可行性,采用力学试验机、DMA、TG、 SEM 等方法分别对HDPE 胶合板与UF 树脂胶合板的物理力学性能、热稳定性、胶合界面进行综合评价。结果表 明:HDPE 薄膜作为胶黏剂使用时具有与UF 树脂相同的黏结能力,且HDPE 薄膜具有更加优异的耐水性能。浸泡 7 d 后,UF 树脂胶合板的吸水率、吸水厚度膨胀率比HDPE 胶合板分别高出23.5%和5.1%。HDPE 胶合板的储能 模量在130 0 C附近降低到极小值,而UF 树脂胶合板则一直保持缓慢降低的趋势;但当温度低于60 0 C时,HDPE 胶 合板的储能模量高于UF 树脂胶合板。HDPE 胶合板与UF 树脂胶合板具有相似的热解规律,但HDPE 胶合板在 420 0 C处有1 个较弱的热解峰。HDPE 薄膜、UF 树脂均可以与杨木单板形成机械啮合结构。Abstract: In order to evaluate the feasibility of using HDPE film as wood adhesives, physical-mechanical properties, thermal properties and interface morphology of two kinds of poplar plywood, made with HDPE film and UF resins as adhesives respectively, were investigated by mechanical testing machine, dynamic mechanical analysis (DMA), thermal gravimetric analysis (TG), and scanning electronic microscope (SEM). Results showed that HDPE film had comparable bonding ability to UF resins and possesed better water-resistance than UF resins. Seven days water absorption and thickness swelling values of the plywood bonded with UF resins were 23。5% and 5。1% higher than those with HDPE film respectively. Storage modulus of HDPE bonded plywood reached a minimum value near 130 0 Cwhile plywood bonded with UF resins remained a slow reduction of modulus in the whole period. However, it presented almost the same dynamic mechanical properties as UF composites when temperature was lower than 60 0 C. Similar pyrolysis characteristics were found in HDPE plywood and UF plywood except an additional weak peak at 420 0 Cfor HDPE plywood. Both HDPE film and UF resins can form mechanical interlock structures with poplar veneers.
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Keywords:
- HDPE film /
- UF resins /
- physical-mechanical properties /
- thermal properties /
- bonding interface
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期刊类型引用(5)
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