I'm pretty beginner and chemistry is not something I know very good.
I have (maybe) very basic question about vulcanizing rubber.
I want to vulcanize SBR rubber with sulphur and zinc oxide.
But final rubber mould is not vulcanized (or very little bit), because sulphur and zinc oxide are not dissolved in mixture and they are settled on the bottom of mixture. I have mixed it very well, with high rpm for a long time.
My question is how I can dissolve sulphur and zinc oxide to fully react with rubber "milk".
Both zinc oxide and sulphur which I'm adding into SBR rubber "milk" are very fine grinded (don't know how big are particles, but are much smaller that an human eye can see - in one fingerprint groove it looks like a dune made of sand).
Rubber is vulcanizing at high temperatures, but also at room temperature (but slower), right?
1.What can help with dissolving? Heat? Ammonia?
2.What is better vulcanizing material instead of mainly zinc oxide, which can be dangerous to human?