Abstract Light stabilizers are widely used in the plastic industry to extend the service life of plastics for outdoor use. Herein, a novel organic–inorganic hybrid light stabilizer was prepared by co-intercalating a reducing agent sorbic acid (SA) and an UV absorber 2-hydroxy-4-methoxy-benzophenone-5-sulphonic acid (UVA) into the interlayer galleries of MgAl layered double hydroxides (LDH) by a separate nucleation and aging steps method. The prepared SA–UVA–LDH was characterized by XRD, FT–IR, SEM, TG–DTA and UV–vis, and was added into the matrix of PP as light stabilizer to evaluate its stabilization efficiency. The results showed that SA–UVA–LDH was evenly distributed in PP, and can offer excellent UV–blocking effect for PP. The addition of SA–LDH, UVA–LDH and SA–UVA–LDH can enhance both the thermal and light stability of PP. It was found that the stabilizing mechanism of SA–LDH arising from the reducing ability of SA is different from the UV–blocking mechanism of UVA–LDH. SA–UVA–LDH/PP has better light stability than SA–LDH/PP and UVA–LDH/PP due to the existence of synergistic stabilizing effect between SA and UVA. Therefore, the prepared SA–UVA–LDH can be potentially used as novel hybrid light stabilizer for PP.

中文翻译：

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还原剂和紫外线吸收剂共嵌入层状双氢氧化物对聚丙烯的协同光稳定作用

摘要 光稳定剂广泛应用于塑料行业，以延长户外塑料的使用寿命。在此，通过将还原剂山梨酸 (SA) 和紫外线吸收剂 2-羟基-4-甲氧基-二苯甲酮-5-磺酸 (UVA) 共嵌入到层间通道中，制备了一种新型有机-无机杂化光稳定剂。通过单独的成核和老化步骤方法制备 MgAl 层状双氢氧化物 (LDH)。制备的 SA-UVA-LDH 通过 XRD、FT-IR、SEM、TG-DTA 和 UV-vis 进行表征，并将其添加到 PP 基体中作为光稳定剂以评估其稳定效率。结果表明，SA-UVA-LDH 均匀分布在 PP 中，可以为 PP 提供优异的紫外线阻隔效果。SA-LDH、UVA-LDH和SA-UVA-LDH的加入可以提高PP的热稳定性和光稳定性。发现由SA的还原能力引起的SA-LDH的稳定机制与UVA-LDH的紫外线阻断机制不同。由于SA和UVA之间存在协同稳定作用，SA-UVA-LDH/PP比SA-LDH/PP和UVA-LDH/PP具有更好的光稳定性。因此，制备的 SA-UVA-LDH 有可能用作 PP 的新型混合光稳定剂。