Natural rubber(NR)vulcanizates were prepared using rare earth antioxidants,such as lan-thanum aminosalicylate(PAS-La),cerium aminosali-cylate(PAS-Ce),lanthanum and cerium aminosali-cylate(PAS-La-Ce),and hindered phenolic antioxi-dant 2246,respectively,the protective effects of four types of antioxidants on NR thermal-oxidative aging were compared by hardness,tensile properties,thermogravimetric analysis,and infrared spec-troscopy,and Kissinger method and Flynn-Wall-Ozawa method were used to analyze the thermal-oxidative aging behavior of NR vulcanizates without antioxidant and with four kinds of antioxidants.The results showed that the protective effect of rare earth antioxidants was better than that of hindered pheno-lic antioxidant 2246,the retention rates of mechani-cal properties of PAS-La/NR,PAS-Ce/NR,and PAS-La-Ce/NR vulcanizates were higher than those of 2246/NR vulcanizate with PAS-La-Ce/NR vulca-nizate having the highest mechanical properties re-tention rate and PAS-La having the best protective effect.During the thermal-oxidative aging process,all five types of NR vulcanizates underwent oxidation reactions,the addition of rare earth antioxidants and hindered phenolic antioxidants 2246 could increase the activation energy required for the thermal-oxida-tive degradation of NR and enhance the thermal oxidative stability of NR,and the thermal-oxidative aging resistance of PAS-La/NR and PAS-Ce/NR vulcanizates was superior to that of antioxidant 2246/NR vulcanizate,while the thermal-oxidative aging resistance of PAS-La-Ce/NR vulcanizate was similar to that of antioxidant 2246/NR vulcanizate.
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