| abstract |
The invention discloses a metal coordination self-healing polyurethane elastomer and a preparation method thereof, belonging to the technical field of self-healing. The preparation method of the present invention comprises the following steps: mixing the diol oligomer and isocyanate to prepare a polyurethane prepolymer; using 2,4-dihydroxypyridine as a chain extender, and adding a catalyst and a solvent to make the polyurethane prepolymer A chain extension reaction occurs; after the chain extension is completed, a metal ion solution is added, stirred at 70-90° C. for 1-2 hours, and the metal-coordinated self-healing polyurethane elastomer is obtained after curing. The invention adopts asymmetric 2,4-dihydroxypyridine as the chain extender, which breaks the conventional knowledge in the industry. Under the joint action of the dynamic network, it has a good self-healing performance. |