癸二酸二-2-乙基己酯和己二酸二-2-乙基己酯热氧化安定性分析

Thermal-oxidative Stability Analysis of Di(2-ethylhexyl) sebacate and Di(2-ethylhexyl) adipate

用高压釜模拟氧化试验,考察了不同温度下空气,纯氧和N-苯基-α-萘胺抗氧剂对癸二酸二-2-乙基己酯和己二酸二-2-乙基己酯热氧化安定的影响。分析了癸二酸二-2-乙基己酯和己二酸二-2-乙基己酯氧化后的运动黏度,酸值和倾点变化。结果表明,纯氧对癸二酸二-2-乙基己酯和己二酸二-2-乙基己酯的酸值影响大于空气,而对运动黏度和倾点的影响较小。N-苯基-α-萘胺抗氧剂够有效抑制酸癸二酸二-2-乙基己酯和己二酸二-2-乙基己酯的酸值增加。己二酸二-2-乙基己酯对N-苯基-α-萘胺抗氧剂的感受性优于癸二酸二-2-乙基己酯。

It was investigated the influences of air,pure oxygen and N-phenyl-α-naphthylamine antioxidant on thermal-oxidative stability of di（2-ethylhexyl）sebacate and di（2-ethylhexyl）adipate at different temperatures with pressurized kettle. The changes of kinematic viscosity, acid number and pour point of di（ 2- ethylhexyl）sebacate and di（2-ethylhexyl）adipate oxidized were analyzed.The results showed that the impact of pure oxygen on acid number of di（2-ethylhexyl）sebacate and di（2-ethylhexyl）adipate was greater than that of air,otherwise had light effect on kinematic viscosity and pour point.N-phenyl-α-naphthylamine antioxidant was effective to inhibit acid number increase of di（2-ethylhexyl）sebacate and di（2-ethylhexyl）adipate.The susceptibility of di（2-ethylhexyl）adipate to N-phenyl-α-naphthylamine antioxidant was better than that of di（2-ethylhexyl）sebacate.