トリアジンジチオ-ルと加硫促進剤MBTSによるSBRの加硫反応

概要

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Vulcanization reaction of SBR by using 6-dibutylamino-1, 3, 5-triazine-2, 4-dithiol (DB), 2, 2′- bis(benzothiazyl)disulfide (MBTS) and ZnO has been investigated for an apparent rate constant (kob), an induction period (t10) and the degree of vucanization (fmax-fmin) at 170°C. The vucanization occured in the case of the co-presence of DB, MBTS and ZnO, and was influenced by the mixing ratio (r) of DB aginst MBTS: kob increased with increase in r, and fmax-fmin in l/r; but t10 had an maximum value at r=0.5. These were explained from the results that the reaction products of DB with MBTS differ with r as follows. The crosslinkingDB+MBTS→R(_??_)nR+_??_=Sr<1; R=_??_-S-, r_??_1; R=Hchain, 2, 4-bis(S-substituent thio)-6-dibutylamino-1, 3, 5-triazine structure was confirmed by the IR spectra measurement and the elemental analyses of the SBR vulcanizates, and seems to be produced by the attack of a thiyl radical aginst the allyl type-methylene structure in SBR rubber, which are formed by the fission of a S-S bond in the reaction products.
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