This is a type of delayed-acting accelerator that is acidic. It has the characteristics of long scorch time and high vulcanization activity. The vulcanized rubber has a relatively high degree of vulcanization, excellent physical and mechanical properties, and excellent aging resistance. The compound has a broad vulcanization flatness. Due to the development of synthetic rubber and the large-scale application and the promotion and application of high-dispersion furnace black, special accelerators with good long-acting properties are required. Therefore, such accelerators occupy a very important position and become the fastest growing and most promising accelerator in recent years. Among the various accelerators currently used in the world, it is mainly sub-alkalamides, among which CZ, NOBS, NS, DZ and OCOS are widely used, and all of them are derivatives of thiol benzothiazole.