Originally Posted by
cyccommute
While you can do cold vulcanization in a bunch of ways, most of them are very slow. The thiocarbamates you are talking about are added to the rubber of the patch. They are called secondary accelerators and are used to activate the primary accelerator. In Rema fluid there is N-Ethylcyclohexylamine listed in the fluid in about 2% concentration. This is the primary accelerator that speeds up the reaction. The thiocarbamate is the sulfur source as well. Long ago I found something similar listed in the MSDS for the patch but Rema doesn’t have an MSDS for the rubber patches anymore.
This article has a very good description of the process but it is rather techical.
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There's lots of environmental and work safety pressure to eliminate the use of cyclohexamine, and there are alternative chemistries that work just as well. the zinc thiocarmates require an activator, which is usually stearic acid, or zinc oxide in combination with stearic acid. None of these require use at levels that show up on SDS, because the SDS is about work place and transport safety, not reverse engineering the trade secrets of products.