Enhancing the Reversion Resistance of NR Compounds

Sulfur-cured rubber compounds containing high amounts of Natural Rubber (NR) are especially prone to degradation during exposure to high temperatures, which occurs during vulcanization as well as during high-temperature service.  The degradation taking place leads to reductions in mechanical strength, fatigue, and abrasion resistance of these compounds.  A review of the technologies known to improve the reversion resistance of NR compounds will be compared and contrasted, with special focus being given to technologies that reduce reversion while improving compound processability.  Through the selection of the proper processing additive, higher vulcanization temperatures can be utilized to improve the manufacturing throughput of high-NR rubber compounds.  Examples of improved fatigue and abrasion resistance in NR tire components will be demonstrated.