光稳定剂对水工闸门用PE-HD/高岭土复合材料性能的影响

Effects of Light Stabilizer on Properties of PE-HD/Kaolin Composites for Hydraulic Gate

采用共混造粒制备含有不同光稳定剂的水工闸门用高密度聚乙烯(PE-HD)/高岭土复合材料,讨论和研究光老化前后复合材料的力学性能变化规律。通过偏光显微镜观察复合材料试样表面形貌、采用傅里叶变换红外光谱和核磁共振氢谱对表面析出物进行分析,讨论比较不同受阻胺光稳定剂的析出原因及抗光老化作用差异。结果表明,添加光稳定剂2020、光稳定剂944、光稳定剂123、光稳定剂770和光稳定剂292的复合材料光老化后力学性能保留率平均值分别为87.1%,81.7%,79.1%,78.2%和75.6%,抗光老化性能依次变弱;分子量大的光稳定剂2020和光稳定剂944更容易与复合材料体系相容,不容易析出,具有更好的抗光老化作用,同时带有较稠密的受阻胺结构的光稳定剂2020具有出色的抗光老化作用,这可为PE-HD/高岭土复合材料光稳定剂选配和抗光老化性失效分析提供参考。

High density polyethylene(PE-HD)/kaolin composites with different hindered amine light stabilizers were prepared by blending granulation.The change rules of mechanical properties of the composites before and after light aging were discussed and studied.The surface morphology of the composites were observed by polarizing microscope,the surface precipitates were analyzed by Fourier transform infrared spectroscopy and nuclear magnetic resonance hydrogen spectroscopy,and the precipitation reason and anti-aging difference of different light stabilizers were discussed and compared.The results show that,after light aging,the average values of mechanical properties retention rates of the composites with adding light stabilizer 2020,light stabilizer 944,light stabilizer 123,light stabilizer 770 and light stabilizer 292 are 87.1%,81.7%,79.1%,78.2%,75.6%respectively,the light aging resistance becomes weaker in turn.Light stabilizer 2020 and light stabilizer 944 with large molecular weight are more easily compatible with the composite system,not easy to precipitate,and have better anti-light aging effects.Light stabilizer 2020 with dense hindered amine structure has excellent anti-light aging effect.This study provides a reference for the selection of light stabilizer and failure analysis of light aging resistance of PE-HD/kaolin composites.