Accelerator M, chemical name: 2-Mercaptobenzothiazole, English abbreviation: MBT, chemical formula: C7H5NS2, appearance: pale yellow needle or flake crystal, unpleasant odor, bitter taste and toxicity. Accelerator M is insoluble in water and gasoline, slightly soluble in benzene, soluble in ethanol, diethyl ether, chloroform, acetone, glacial acetic acid, ethyl acetate, sodium hydroxide solution, sodium carbonate solution, etc. it can be combusted and decomposed to release toxic smoke, with explosion risk. Accelerator M is an important rubber accelerator and can be used as plasticizer.

Accelerator M is mainly used as rubber accelerator, and can also be used as plasticizer, electroplating additive, metal corrosion inhibitor, lubricating oil additive, pesticide bactericide, nitrogen fertilizer synergist, analytical reagent, etc. In the field of rubber product manufacturing, accelerator M can be used directly or in combination with other accelerators. It has good vulcanization promoting effect on natural rubber and synthetic rubber, good dispersion and no pollution, and can be widely used in the fields of tire, tape and shoe making. In addition, accelerator M can also be used as an intermediate to produce accelerator NS, DM, DZ, CBS, nobs, dibs, etc.

There are many methods to prepare accelerator M, mainly including: Taking aniline as raw material, putting it in an autoclave, adding aniline, carbon disulfide and sulfur to react under high pressure; Using o-nitrochlorobenzene as raw material, it was prepared by reacting with sodium hydrosulfide / hydrogen sulfide under atmospheric pressure and then with carbon disulfide; Diphenylthiourea was prepared by reaction under medium pressure. Among them, the aniline method has simple production process, stable raw material supply, low equipment requirements and high application ratio, but its yield is low; Other methods have shortcomings in raw material price, process complexity, reaction control difficulty, equipment requirements, etc., so new production methods of accelerator M are still coming out.