Production method of antioxidizer 300

The invention relates to a production method of an antioxidizer 300 and belongs to the technical field of manufacturing of an alkylphenol sulfide antioxidizer. The production method comprises the following steps that 1, saturated aliphatic hydrocarbon solvent oil with high boiling range is used as a solvent, 6-tert-butyl-m-cresol and sulfur chloride conduct a sulpho reaction, and 4,4'-sulpho bis(6-tert-butyl-m-cresol) is generated; 2, after the sulpho reaction is completed, low-molecular-weight alcohol is added; 3, the temperature is increased, hydrogen chloride and alcohol are generated through evaporation and then cooled to the normal temperature, a weak base aqueous solution is added, the pH value of the material is adjusted to be neutral, and through filtering, a coarse product is obtained. The production method is scientific, reasonable, simple and easy to implement, the small amount of residual hydrogen chloride which needs to be neutralized is only produced in the production process, and the produced a