Abstract
2-R-4, 6-dimercapto-s-triazine bis-sulfenamide (I) has been found to give a polyepichlorohydrin (CHR) vulcanizate by forming 2-R4, 6-dimercapto-s-triazaine (II) at 160°C in the presence of sulfur on CHR. The formation of II is attained by reduction of I with H2S as well as by radical scission of polysulfide from I with sulfur. The vulcanization is highly accelerated by I containing a strong basic substituent R : N (C4H9)2, N (C2H5)2, N (C6H11)2 and a fairly long scorch time appropriate for practical use is observed on the CHR vulcanization in use of I cotaining a primary amine component such as NHC6H11. The thermal ageing stability of the CHR vulcanizates of I at 160°C is little inferior to that using II directly. The vulcanization mechanism is discussed on the CHR vulcanizing system containing magnesia, sulfur and I.
