充油SBS变黄原因分析

Study on the Cause of Yellowing of SBS Containing Oil

针对充油SBS产品存在容易变黄的问题,研究了光氧条件和热氧条件下SBS的变黄规律,分析了其发生变黄的机理。研究结果表明,充油SBS产品变黄的主要原因是油品中的稠环芳烃在光氧环境中易转化为黄色的醌,添加抗氧剂对延缓产品变黄的作用不大,通过催化加氢消除填充油中的芳烃或添加适当的光稳定剂可以提高产品的耐黄变性能。

According to yellowing of SBS containing oil, the effects of every component of SBS containing oil on the anti - yellowing were investigated in the light - oxygen and thermo - oxygen. It was found that the main reason why SBS containing oil was easy to yeLlow was that there is plenty of polycyclic aromatic hydrocarbon （PAH） in the extender oil, PAH can easily turned quinones with yellow. Anti - yellowing performance of SBS can be only developed in a little extent when antioxidants were added. The anti - yellowing performance of SBS can be obviously improved when hydrogenated oils or light stability agent were applied.