本发明公开了一种五亚甲基异氰脲酸酯的制备方法，包括以下步骤:(1)合成预聚体：将催化剂与催化稀释剂混合后加入五亚甲基二异氰酸酯中，并加入抗氧剂A和助催化剂进行反应，再加入阻聚剂终止反应，得异氰脲酸酯预聚体；(2)脱色处理：向异氰脲酸酯预聚体中加入酸反应生成沉淀，抽滤，得脱色处理的异氰脲酸酯预聚体；(3)稳定化处理：向脱色处理的预聚体中加入抗氧剂B与稳定剂，搅拌，得稳定化处理的异氰脲酸酯预聚体；(4)分离处理：将稳定化处理的异氰脲酸酯预聚体输送至两级短程分子蒸馏装置进行两次分离处理，得五亚甲基异氰脲酸酯。该制备方法具有可操作性强，分离效率高，产品质量好，残单回收率高的优点，符合绿色环保要求。

The present invention discloses a preparation method for pentamethylene isocyanurate, comprising the following steps: (1) synthesizing a prepolymer: mixing a catalyst with a catalytic diluent and adding it to the pentamethylene diisocyanate, adding antioxidant A and a co catalyst for reaction, and then adding an inhibitor to terminate the reaction to obtain the isocyanurate prepolymer; (2) Decolorization treatment: adding acid reaction to the isocyanurate prepolymer to generate precipitation, and filtering to obtain the decolorized isocyanurate prepolymer; (3) Stabilization treatment: Add antioxidant B and stabilizer to the decolorized prepolymer, stir to obtain the stabilized isocyanurate prepolymer; (4) Separation treatment: The stabilized isocyanurate prepolymer is transported to a two-stage short range molecular distillation device for two separation treatments to obtain pentamethylene isocyanurate. This preparation method has the advantages of strong operability, high separation efficiency, good product quality, and high residual recovery rate, which meets the requirements of green environmental protection.