防老剂N-(4-苯胺基苯基)-甲基丙烯酰胺的制备及其在天然橡胶中的应用

Preparation of antioxidant N-(4-anilinophenyl)-methacrylamide and its application in natural rubber

用甲基丙烯酰氯和对氨基二苯胺制备了反应性非迁移防老剂N-(4-苯胺基苯基)-甲基丙烯酰胺(NAPM),用红外光谱对其进行了表征,研究了其用于天然橡胶(NR)时硫化胶的物理机械性能和耐老化性能,并与防老剂4010 NA和4020进行了比较。扫描电镜和透射电镜分析结果表明,添加NAPM的NR硫化胶表面呈现一种网状结构,提高了NAPM在NR中的稳定性。NR硫化胶在70℃老化48 h后,NAPM的老化系数(K)与4010 NA和4020相差甚微;老化时间延长24 h后其K值明显高于4010 NA和4020,K(4020)/K(4010 NA)仅增加了3.09%,而K(NAPM)/K(4010 NA)却增加了14.21%,表明添加NAPM的NR硫化胶的耐老化性能明显优于添加4010 NA和4020的NR硫化胶。

N-（ 4-anilinophcnyl ）-methacrylamide （NAPM） ,a reactive and non-migrating antioxidant was successfully synthesized from methacryloyl chloride and 4-aminodiphenylamine, and characterized by infrared spectroscopy. The mechanical and aging properties of vulcanized natural rubber （NR） were studied with NAPM as antioxidant, and compared with those of antioxidants 4010 NA and 4020. The analytical results by scanning electron microscopy and transmission electron microscopy indicated that a network structure appeared on the surface of NR. vulcanizate with NAPM, which enhanced the stability of NAPM in NR. There was no much difference for the aging coefficients （K） among NAPM and 4010 NA,4020, after NR vuleanizates was aged at 70 ℃ for 48 h. The K value of NAPM was markedly higher than those of 4010 NA and 4020 when aging time was extended for 24 h. The ratio of K （4010 NA）/K （4020） merely increased by 3.09% , whereas the ratio of K（ NAPM）/K（4010 NA） increased by 14.21%. It was indicated that the aging resistanee of NR added NAPM was much superior to those of NR vuleanizates with 4010 NA and 4020.