光稳定剂对聚氨酯仿皮面料黄变性能的影响

Effect of Light Stabilizer on Yellowing Property of Polyurethane Leather Fabric

为改善聚氨酯仿皮面料的抗黄变性能，采用现代测试手段探究其涂层膜的黄变原因，并优选了具有抗黄变功能的光稳定剂，探究光稳定剂的种类、复配比、用量等对聚氨酯仿皮面料抗黄变性能的影响。结果表明：在紫外光作用下，芳香族聚氨酯结构中生成的羰基、醌式基团引起了聚氨酯涂层膜的黄变；添加紫外线吸收剂UV‐531或受阻胺光稳定剂L S‐622均能改善聚氨酯仿皮面料的抗黄变性能；两者复配使用抗黄变效果优于单一使用，当 UV‐531与LS‐622复配比为3∶1、用量为2．0％时抗黄变效果最佳。

To improve anti‐yellowing property of PU synthetic leather fabric ,modern testing methods were applied to explore the reasons for yellowing of the coating film ,and the light stabilizer with anti‐yellowing function was preferably chosen to explore the effect of light stabilizer type ,compound ratio and dosage on anti‐yellowing property of PU synthetic leather fabrics .The results show that under UV light , carbonyl group and quinone group generated in aromatic polyurethane structure cause yellowing of PU coating film ;UV absorber UV‐531 or hindered amine light stabilizer LS‐622 can improve anti‐yellowing property of PU synthetic leather fabric .The compound of both has better anti‐yellowing effect than single use .When complex ratio of UV‐531 and LS‐622 is 3：1 ,and the dosage is 2 .0% ,the anti yellowing effect is optimal .