Substituted triazines with phosphonyl group as antioxidants for elastomers and their compounds

A number of substances with a triazinic. structure provide antioxidant properties, but they have been less studied and used in elastomer processing. The presence of thiol groups also allowed the grafting of the triazinic. antioxidant on the chain of the unsaturated elastomer during processing, vulcanization and/or the oxidative process. We have evaluated the protective capacity of some substituted triazines both in elastomer matrix and in vulcanizates. Two kinds of triazines, with aminophenolic and phosphonic substituents, have been evaluated for their protective action in diene elastomers as such and in simplified recipe with NR matrix. In elastomers, the triazinic component with one phosphonic group has a superior protective capacity to that of triazine substituted with two phosphonic groups. (C) 2001 Elsevier Science Ltd. All rights reserved.