Salicylic acid modified self-repairing polyurethane elastomer and preparation method thereof

The invention relates to a salicylic acid modified self-repairing polyurethane elastomer and a preparation method thereof, and belongs to the technical field of polymers. The polyurethane matrix is composed of a hard chain segment and a soft chain segment, and the salicylic acid and the polyurethane matrix are connected through intermolecular hydrogen bonds; the self-repairing performance of polyurethane can be improved; the formation of intermolecular hydrogen bonds is beneficial to improving the density of a polyurethane cross-linked network and enhancing the mechanical properties of polyurethane. The invention further provides a preparation method of the salicylic acid modified self-repairing type polyurethane elastomer, salicylic acid molecules are introduced into a polyurethane system through a solvent replacement method to generate a hydrogen bond network, the method is simple in step, an experimental formula can be changed according to production requirements, and industrial production can be carried o