无卤阻燃剂对阻燃聚烯烃材料耐热氧老化性能的影响

采用熔融混炼法制备了不同无卤阻燃剂阻燃聚烯烃复合材料，以热烘箱老化法，使用万能试验机和差示扫描量热仪等仪器测试了其热氧老化、热开裂性能和氧化诱导期。结果表明，添加了不同种类无卤阻燃剂的材料的耐热老化性能优劣顺序为：硼酸锌＞氢氧化镁＞三氧化二锑＞三聚氰胺尿酸盐＞氢氧化铝＞磷酸盐＞碳酸钙；阻燃剂粒径越小，以其阻燃的聚烯烃热老化性能越差，阻燃剂经硅烷表面处理后，可提高阻燃聚烯烃的热氧老化性能。

Influence of Halogen-free Flame Retardants on Thermal-oxidative Aging Performance of Flame Retardant Polyolefin Composites

The polyolefin compounds with halogen-free flame retardants were prepared by a melt blending method, and the thermal-oxidative aging and thermal cracking properties, oxidation induction time of the resulting flame-retardant compounds were characterized by means of oven heating, universal testing machine and differential scanning calorimetry. The results indicated that, when different halogen-free flame retardants were incorporated, the flame-retardant polyolefin compounds presented the improved thermal oxidative aging performance by an order of zinc borate>Mg(OH)2>Sb2O3>melamine cyanurate>Al(OH)3>phosphate>CaCO3. The smaller the particle size of halogen-free flame retardants, the poorer the thermal oxidative aging performance. In addition, the surface treatment of halogen-free flame retardants improved the thermal oxidative aging performance of flame-retardant polyolefin compounds.