2,5-Di(4-chloroanilino)-3,6-dichloroquinone tvulcanizing. The vulcanizing agent including: sodium sulfide, sodium sulfide and sodium acetate, sulfur sodium hydride, sodium sulfide and sulfur sodium hydride, sodium thiosulfate and sodium sulfide and ferric chloride. The use of temperature and pressure conditions determine product color tone, and in some cases, by large different preparation methods and show almost the same results.