新型分子内复合主抗氧剂的合成与性能

Synthesis and performance of a novel intramolecular complex primary antioxidant

以2,6-二叔丁基苯酚原料,经过硝化和还原反应合成了一类新型的分子内复合型主抗氧剂2,6-二叔丁基对氨基苯酚。通过正交实验和条件优化实验确定最佳反应条件为:锌粉为还原剂,氯化钙质量分数为8%,氯化钙溶液的体积分数为45%,乙醇的体积分数为50%,反应时间为8 h,反应温度为80℃,产品的收率在80%以上,熔程为112.2～113.3℃。元素分析和IR结果证明合成的产品结构与目标产物分子结构相同。熔体流变速率和氧化诱导期的测定结果表明,新型抗氧剂在聚乙烯的加工和使用过程中能很好地抑制其氧化降解。

A novel intramolecular complex primary antioxidant,2,6-di-tert-butyl-р-aminophenol was sythesied from 2,6-di-tert-butylphenol via nitration and reduction.The synthesis conditions of were optimized by orthogonal design and conditional experiment.The final product（melting point 112.2—113.3 ℃）was obtained in 80% yield with zinc powder as reducing agent,8% of ω（CaCl2）,45% in volume of calcium chloride solution,50% in volume of ethanol,and at 80 ℃ for 8h of reaction.The product was confirmed as desired by elemental analysis and IR spectroscopy.The antioxidation performance for polyethylene was evaluated by measurements of melt flow rate and oxidation induction time.Results showed that the synthesized complex primary antioxidant can prevent the oxidative degradation of polyethylene during processing and service life.