Preparation method of rubber vulcanization accelerator DTDC

The invention provides a preparation method of rubber vulcanization accelerator DTDC, relating to the technical field of rubber vulcanization. The preparation method comprises the following steps: byadopting caprolactam and sulfur monochloride as reactants, caprolactam as an acid-binding agent, and petroleum ether as a solvent, dissolving, condensing and the like, synthesizing to obtain N,N'-caprolactam disulfide (DTDC). The purity, initial melting point and yield of the DTDC obtained by adopting the method are respectively more than 99%, 133 DEG C, and 95%. The raw material caprolactam usedin the preparation method can be recycled, and the solvent petroleum ether is easily distilled and can also be recycled. Therefore, the recycling can be realized from raw materials to water for production, so that the preparation method is a typical cleaning production technology. The method effectively solves the problems that the product prepared by adopting the existing DTDC preparation methodis low in quality and yield