聚甲醛的耐紫外光/耐候改性

摘要

研究了紫外光吸收剂、热稳定剂、光稳定剂等复合助剂对聚甲醛（POM）耐候性能的影响，并对改性前后的POM进行了人工加速老化测试和评价。结果表明：经人工加速老化500，1000h后，改性POM的拉伸强度、弯曲强度、悬臂梁缺口冲击强度保持率分别达到104.0%和106.0%，106.0%和107.0%，68.9%和62.2%；老化前后改性POM颜色基本没有变化，远优于未经耐候改性POM的相应性能。%The author studied the influences of composite additives including ultraviolet absorber,heat sta-bilizer,light stabilizer,etc. on weathering resistant performance of polyoxymethylene(POM). The artificial ac-celerated aging behaviors of POM before and after weathering resistant modification were evaluated. The results show that the retention of the tensile strength,flexural strength and Izod notched impact strength of the modified POM reach 104.0% and 106.0%,106.0% and 107.0%,68.9% and 62.2% respectively when the modified POM is aged for 500 h and 1 000 h. And the color of the modified POM before and after aging has little change,which is much better than the corresponding properties of POM without modification.