两种杯[4]芳烃化合物对天然橡胶耐热氧老化性能的影响及抗氧化机理

Effect of Two Kinds of C-methylcalix[4] Resorcinarene Compounds on Thermo-oxidative Aging Resistance of NR and Its Mechanism

将含乙氧基甲基侧链的杯[4]芳烃-1和含硫醚基及正己基侧链的杯[4]芳烃-2作为抗氧剂加入天然橡胶(NR)中,研究其对NR硫化胶物理性能和耐热氧老化性能的影响,并分析其抗氧化机理。结果表明:杯[4]芳烃-1和杯[4]芳烃-2(用量均为1份)对NR硫化胶的物理性能影响均不大,均可有效提高NR硫化胶的耐热氧老化性能;添加杯[4]芳烃-2的NR硫化胶耐热氧老化性能与添加抗氧剂2246S的NR硫化胶相当,优于添加杯[4]芳烃-1的NR硫化胶,这主要归因于杯[4]芳烃-2与NR良好的相容性以及酚羟基与硫醚基的协同抗氧效应。

Two kinds of C-methylcalix[4] resorcinarene（CMCR） compounds,CMCR-1 with ethoxymethyl side chains and CMCR-2 with thioether groups as well as hexylthiolmethyl side chains were applied in natural rubber（NR）,the effects of the two kinds of CMCR compounds on the physical properties and thermo-oxidative aging resistance of NR vulcanizates were investigated,and the mechanism was also analyzed. The results showed that,when the addition level of CMCR-1 or CMCR-2 was 1 phr,the thermooxidative aging resistance of NR vulcanizates was effectively improved,and the physical properties changed little. NR vulcanizates with CMCR-2 possessed similar thermo-oxidative aging resistance as the NR vulcanizates with antioxidant 2246 S and better than NR vulcanizates with CMCR-1,which was mainly due to the good compatibility between CMCR-2 and NR matrix as well as the synergistic antioxidative effect between thioether groups and hindered phenol groups.