Method for preparing high-tin high-sulfur methyl tin mercaptide product

The invention relates to a method for preparing a high-tin high-sulfur methyl tin mercaptide product and belongs to the technical field of deep processing of organic tin. The technical scheme provided by the invention comprises the following steps of: adding isooctyl thioglycolate into a reactor, and adding an aqueous solution of sulfosalt, an aqueous solution of methyl tin chloride and a neutralizer of alkaline solution according to the ratio for complete reaction to synthesize high-tin high-sulfur methyl tin mercaptide, wherein the molar concentration ratio of the sulfosalt to the methyl tin mercaptide is 1:5-2:5, the reaction temperature is between 20 and 40 DEG C, the pH value in the reaction is 5.0 to 7.0, and the pH value at the endpoint of the reaction is 8.0 to 9.0. The PVC thermal stabilizer prepared by the method provided by the invention is big in molecular weight and high in stability and environmental pollution caused by users in plastics processing industry during PVC processing can be reduced.