In order to improve the aging resistance of HDPE, antioxidants (Irganox1010 and Irgafos168) are combined with UV absorber (UV-326 or UV-531). Analyses of ultraviolet–visible (UV–vis) and Fourier transform infrared spectroscopy show that UV-326 has a better capacity of UV absorbance, but easier to migrate to the HDPE surface due to the bigger difference of solubility parameter with HDPE than UV-531. The mechanical property indicates a better synergistic effect between UV-531 and antioxidants. With the single addition of antioxidant, the mechanical property sharply decreased to low level during irradiation for 200 h. With single addition of UV absorber, the elongation at break of the sample can still be maintained at about 700% until irradiation for 600 h. When two different UV absorbers are used in combination with antioxidants, HDPE with UV-326 maintains high mechanical property when irradiated for 1200 h, while the samples containing UV-531 still maintain good mechanical property when irradiated for 1600 h.

中文翻译：

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两种不同紫外线吸收剂与抗氧化剂组合对HDPE抗紫外线性能的影响

为了提高HDPE的抗老化性能，抗氧化剂（Irganox1010和Irgafos168）与紫外线吸收剂（UV-326或UV-531）结合使用。紫外-可见（UV-vis）和傅里叶变换红外光谱分析表明，UV-326具有更好的紫外吸收能力，但由于与HDPE的溶解度参数差异比UV-531大，因此更容易迁移到HDPE表面. 力学性能表明 UV-531 与抗氧化剂有更好的协同作用。单次加入抗氧化剂后，辐照200小时后，力学性能急剧下降至低水平。单次添加紫外线吸收剂后，样品的断裂伸长率仍可保持在 700% 左右，直至照射 600 小时。当两种不同的紫外线吸收剂与抗氧化剂结合使用时，