咖啡壳粉对木塑复合材料耐候性能的影响

Effect of Coffee Husk Powder on Weather Resistance of Wood Plastic Composites

用咖啡壳粉(CHP)代替木粉,以增强高密度聚乙烯(HDPE)的抗老化性能。以两步成型法熔融共混制备了木塑复合材料(WPCs),经过氙灯老化2000h后,测试其耐候性能。采用红外光谱(FTIR)、X射线光电子能谱(XPS)、表面颜色、机械性能、热稳定性、微观形貌(SEM)来测试WPCs的抗老化性能。结果表明,在老化2000 h后,CHP高混杂样品(HCHP/HDPE)的降解速率加快,使其更容易褪色和开裂;而CHP低混杂样品(LCHP/HDPE)的羰基指数、O/C比增幅最小(分别为136.6%、66.23%),物理性能降幅不明显,故CHP低混杂填料,可以提高桉木纤维/高密度聚乙烯(WF/HDPE)木塑复合材料的耐候性能。

Coffee Husk powder(CHP)was utilized in place of wood powder to enhance the anti-aging properties of high-density polyethylene(HDPE)in the production of wood plastic composites(WPCs)using a two-step melt blending method.The weathering resistance of the WPCs was evaluated following exposure to xenon lamp aging for 2000 hours.Various aspects of the anti-aging properties of the WPCs were analyzed using infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),surface color assessment,mechanical testing,thermal stability examination,and microstructural analysis via scanning electron microscopy(SEM).The findings indicate that prolonged aging for 2000 hours accelerates the degradation rate of the high CHP mixture samples(HCHP/HDPE),rendering it more susceptible to fading and cracking.In contrast,the lowCHP mixture samples(LCHP/HDPE)exhibited the smallest increase in both carbonyl index(136.6%)and O/C ratio(66.23%),with no significant decline in physical properties observed.Thus,incorporating low CHP mixture fillers can effectively enhance the weather resistance of wood-plastic composites consisting of eucalyptus fiber and high-density polyethylene(WF/HDPE).