Preparation method of trifunctional aziridine cross-linking agent

The invention discloses a preparation method of a trifunctional aziridine cross-linking agent, which comprises the following steps: S1, carrying out Michael addition reaction on a compound 1 and a compound 2 to obtain an intermediate; s2, mixing the intermediate in the step S1, alkali I, a copper catalyst, an organic amine ligand and a solvent I, and carrying out cyclization reaction to obtain the trifunctional aziridine cross-linking agent, wherein the structural formulas of the compound 1, the compound 2, the intermediate and the trifunctional aziridine cross-linking agent are as follows: # imgabs0 # R is selected from at least one of hydroxyl, halogen, a methanesulfonate group, a trifluoromethanesulfonic acid group or p-toluenesulfonyloxy. According to the method, the aziridine cross-linking agent is prepared by adopting a free radical nitrogen cyclization strategy, the use of a high-toxicity chemical aziridine is avoided, and the method has the advantages of mild reaction conditions, simple post-treatment