Preparation method of high-purity tin isooctyl methyl trithioglycolate heat stabilizer

The invention relates to a preparation method of a high-purity tin methyl trithioglycolate heat stabilizer. A methyl tin chloride aqueous solution, an alkali liquor and isooctyl thioglycolate are as reaction raw materials, and a two-step method is adopted for preparation. The method the following steps of: firstly, removing dimethyl tin dichloride in the methyl tin chloride aqueous solution; and 2, preparing the tin methyl trimercaptoacetate heat stabilizer. The method is mild in reaction condition, simple and convenient to operate and high in conversion rate, the high-purity tin methyl trimercaptoacetate heat stabilizer with the purity of 90-99.5% can be prepared, and the product quality is stable. 高纯度一甲基三巯基乙酸异辛酯锡热稳定剂的制备方法，是以甲基氯化锡水溶液、碱液和巯基乙酸异辛酯为反应原料，分两步法进行制备，第一步先除去甲基氯化锡水溶液中的二甲基二氯化锡成分，第二步再进行一甲基三巯基乙酸异辛酯锡热稳定剂的制备。本发明方法反应条件温和，操作简便，转化率高，可制得纯度在90～99.5％的高纯度一甲基三巯基乙酸异辛酯锡热稳定剂，且产品质量稳定。