Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Migration of Antidegradants to the Surface in NR Vulcanizates: Influence of Content of Carbon Black

  • Published : 1998.02.20
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Abstract

Migration properties of antidegradants to the surface in NR vulcanizates containing carbon black of 30, 50, and 70 phr were studied using the migration-generating equipment with a vacuum technique. The migration was carried out at 60, 80, and 100 ℃ for 20 h. BHT, IPPD, HPPD, and wax were used as migrants. IPPD migrates faster than the other migrants. Amounts of BHT, IPPD, and HPPD that migrated at 60 and 80 ℃ decrease as the content of carbon black in the vulcanizate increases. Migrations of antidegradants in the NR vulcanizate containing carbon black of 50 phr are faster than those containing carbon black of 30 and 70 phr at 100 ℃. Although n-C23H48 is heavier than HPPD, it migrates faster than HPPD and even faster than BHT at 100 ℃. Influencing factors of carbon black on the migrations are its porous structure and polar functional groups on the surface.

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