研究木粉/高密度聚乙烯(WF/HDPE)复合材在不同朝向的自然老化条件下使用时颜色与表面化学成分的变化,并分析采用光稳定剂、抗氧剂和颜料作为防老化剂的效果。户外使用的木粉/HDPE复合材在夏天暴晒1个月颜色就会发生明显变化,南面和东面更加显著,红外分析表明: 复合材料表面C O增加、木材指数下降,有氧化现象发生。人工加速稳定老化检测结果表明: 与抗氧剂和光稳定剂相比,颜料的使用对减小变色有明显作用,但颜料、抗氧剂和光老化剂3种助剂对延缓WF/HDPE复合材的抗弯性能下降没有起到明显作用。
This article discussed the changes in color and chemical components on the surfaces of wood flour(WF)/high density polyethylene(HDPE)composite used outdoor in different orientation. Light stabilizer, antioxidant, and iron oxide red were introduced to reduce the changes when exposed to accelerate ultraviolet aging. The results showed that WF/HDPE composite changed significantly in color after only one month natural weathering in hot summer, especially for those facing to south and east orientation. FTIR test showed C O increased and wood index decreased. Comparing to photostabilizer and antioxidant, iron oxide red pigment reduced color change more significantly. However, neither of these additives could obviously prevent flexural properties decreasing.