Abstract: The new intermolecular complex antioxidant [3-(3,5-di-tert-butyl-4-hydroxy-phenyl)] propionyl phosphoric acid bisoctadecanol ester was synthesized from methyl-3-(3,5-di-tert-butyl-4- hydroxyphenyl)-propionate (MPC)，diethyl phophite and octadecanol. The influence of catalyst and its quantity，reaction medium and other reaction parameters were studied. FTIR and elemental analysis results confirmed that the product was the one as desired. The results showed that by using organo-tin compound as catalyst，under the optimum reaction conditions the yield of the product (melting point 47.7—49.2℃) can be up to 75%. The antioxidant presented excellent performance by the tests of oxidation induction time (OIT)，melt flow rate (MFR)，tensile strength and elongation when used in PP.

摘要： 以3-(3,5-二叔丁基-4-羟基苯基)丙酸甲酯（MPC）、亚磷酸二乙酯和十八碳醇为原料合成了一种新型分子内复合型抗氧剂[3-(3,5-二叔丁基-4-羟基)苯基]丙酰基磷酸双十八酯。研究了催化剂种类及用量、溶剂及合成工艺条件对反应的影响。通过FTIR和元素分析证明产品与设计的分子结构一致。用有机锡做催化剂，在优化的合成条件下，产品熔点为47.7～49.2℃，收率>75%。将该产品应用于聚丙烯中，氧化诱导期、熔体流动速率、拉伸强度和断裂伸长率测试结果表明其具有良好的抗氧作用。