Neoprene is produced by emulsion polymerization, and the production process is batch polymerization of single kettle. The polymerization temperature is controlled in 40~60℃, and the conversion rate is about 90%. Polymerization temperature, the final conversion rate is too high or the polymerization process into the air (oxygen) will lead to product quality decline.
The molecular weight is regulated by sulfur-autumn lamb (alkyl methyl sulfide) system in production. The main drawback of the sulfur-autumn lamb system is that the sulfur bond is not stable enough, which is one of the important factors affecting the storage. If the molecular weight is regulated by mercaptan, the performance can be improved. Neoprene is different from general synthetic rubber, it does not need sulfur vulcanization, but uses zinc oxide, magnesium oxide and so on vulcanization.