新型分子内复合主抗氧剂的合成与性能

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。

Effect of Temperature on the Reaction of 2-(N-acetylamine)-3-(3,5-di-<i>tert</i>-butyl-4-hydroxyphenyl)-propionic Acid with Oxygen in an Alkaline Condition

Results of oxidation 2-(N-acetylamine)-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionic acid oxygen depend on temperature. At 55℃?- 60℃, 2,4-di-tert-butylbicyclo(4,3,1)deca-4,6-dien-8-(N-acetylamine)-3,9-dion-1-oxa is formed. The constitution is based on dates of spectrums 1Н and 13С NMR. At 95℃?- 97℃, mixtures of 2,4-di-tert-butylbicyclo(4,3,1)deca-4,6-dien-8-(N-acetylamine)-3,9-dion-1-oxa and of 6,8-di-tert-butyl-3-(N-acetylamine)spiro(4,5)deca-1-oxa-5,8-dien-2,7-dione are produced. Structures are calculated by the method of Hartrii-Foka. Values of enthalpies and of entropies allow to assume dynamic isomerism.