Mo Xianfeng, Zhang Xinhao, Fang Lu, Zhang Yu
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
College of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing 210037, China.
Polymers (Basel). 2021 Dec 28;14(1):98. doi: 10.3390/polym14010098.
When thermoplastic resins such as polyethylene (PE) and polypropylene (PP) are selected as wood adhesives to bond wood particles (fibers, chips, veneers) by using the hot-pressing technique, the formaldehyde emission issue that has long existed in the wood-based panel industry can be effectively solved. In this study, in general, thermoplastic-bonded wood-based panels presented relatively higher mechanical properties and better water resistance and machinability than the conventional urea-formaldehyde resin-bonded wood-based panels. However, the bonding structure of the wood and thermoplastic materials was unstable at high temperatures. Compared with the wood-plastic composites manufactured by the extruding or injection molding methods, thermoplastic-bonded wood-based panels have the advantages of larger size, a wider raw material range and higher production efficiency. The processing technology, bonding mechanism and the performance of thermoplastic-bonded wood-based panels are comprehensively summarized and reviewed in this paper. Meanwhile, the existing problems of this new kind of panel and their future development trends are also highlighted, which can provide the wood industry with foundations and guidelines for using thermoplastics as environmentally friendly adhesives and effectively solving indoor pollution problems.
当选择聚乙烯（PE）和聚丙烯（PP）等热塑性树脂作为木材胶粘剂，通过热压技术粘结木材颗粒（纤维、木片、单板）时，人造板行业长期存在的甲醛释放问题能够得到有效解决。在本研究中，总体而言，热塑性粘结人造板相较于传统脲醛树脂粘结人造板，呈现出相对更高的机械性能、更好的耐水性和可加工性。然而，木材与热塑性材料的粘结结构在高温下不稳定。与通过挤出或注塑成型方法制造的木塑复合材料相比，热塑性粘结人造板具有尺寸更大、原材料范围更广和生产效率更高的优点。本文对热塑性粘结人造板的加工工艺、粘结机理和性能进行了全面总结与综述。同时，也突出了这类新型板材存在的问题及其未来发展趋势，可为木材行业将热塑性塑料用作环保胶粘剂并有效解决室内污染问题提供依据和指导。
