光稳定剂在聚氨酯仿皮织物上的应用

为提高聚氨酯仿皮织物的抗黄变性，在分析紫外光对聚氨酯涂层膜性能和表面形貌影响的基础上，研究光稳定剂对聚氨酯仿皮织物抗黄变性的作用，通过色差值对织物变色等级进行评价分析，并确定光稳定剂最佳质量配比；探讨转移涂层中烫印温度、烫印时间和后道水洗、热定形等工序对聚氨酯仿皮织物抗黄变效果的影响，并优化了工艺条件。结果表明：聚氨酯仿皮织物中添加光稳定剂可显著降低光刻蚀老化速率，提高抗黄变性能；当受阻胺光稳定剂LS-622与紫外线吸收剂UV-531质量比为1：3，质量分数为2.0%（对浆料重），烫印温度为100 ℃，烫印时间为30s 时，棕色聚氨酯仿皮织物的抗黄变效果优异，变色等级提高到2级，变色轻微。

Application of light stabilizers on polyurethane leather fabrics

In order to improve the yellowing resistance of polyurethane leather fabrics, the influence oflight stabilizers on the yellowing resistance of polyurethane leather fabrics was investigated byanalyzing the influence of UV light on the performance and appearance of polyurethane coating film. In addition, the optimized compound admixture ratio of light stabilizers depending on the analysis and evaluation ofinfluence of color difference value on the level of leather color change was obtained. The relatedprocess conditions were optimized by studying theinfluence of processes such asstamping temperature, stamping time, washing and heat setting on the yellowing resistance of polyurethane leather fabrics. The results indicate that by adding light stabilizers into polyurethane leather fabrics, the aging rate of photoengraving could be dramatically reduced and the yellowing resistance could be enhanced. When the mass of hindered amine light stabilizer LS-622 is one third of that of UV absorber UV-531, the weight is2.0%, the stamping temperature is 100 ℃ and the stamping time is 30 s, the anti-yellowingeffect of brown polyurethane leather fabricsis optimized, and the level of color changeis increased to level 2 with slight color change.