Preparation method of antioxidant AO 3052

The invention relates to a preparation method of an antioxidant AO 3052, which comprises the following steps: uniformly mixing an antioxidant 2246 with toluene and acrylic acid, carrying out a sufficient chemical reaction with a phosphorus oxychloride toluene solution under the action of a triethylamine catalyst, washing twice to obtain a crude antioxidant AO 3052, and cooling, crystallizing, centrifuging and drying the crude antioxidant AO 3052 to obtain a fine antioxidant AO 3052. The preparation method of the antioxidant AO 3052 adopts toluene as a solvent and triethylamine as a catalyst, not only reduces the addition of other solvents or multi-component catalysts, reduces the disadvantage of unsatisfactory reaction effect, shortens the production cycle, improves the conversion rate of raw materials, and reduces the production cost and operation cost, but also has the advantages of mild reaction temperature, high safety coefficient, and high product yield. And the method is beneficial to environmental gove