The main reasons for the occurrence of “self-sulfur” during the mixing of rubber compounds
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(1) The vulcanizing agent used, too much accelerator;
(2) The glue loading capacity is large, the temperature of the rubber mixing machine is too high, and the film cooling is insufficient;
(3) or prematurely adding sulfur, the uneven dispersion of the drug causes local concentration of the promoter and sulfur;
(4) Improper parking, that is, the temperature of the parking place is too high, and the air is not circulating.
