Self-repairing polyurethane based on hydrogen bonds and dynamic disulfide bonds as well as preparation method and application of self-repairing polyurethane

Abstract

The invention belongs to the field of polymer preparation, and relates to self-repairing polyurethane based on hydrogen bonds and dynamic disulfide bonds as well as a preparation method and application of the self-repairing polyurethane. The preparation method comprises the steps: introducing a plurality of diisocyanates into unsaturated polyester with low molecular weight to form hydroxyl-terminated unsaturated polyurethane; grafting and introducing a prepolymer containing an isocyanate group and dynamic disulfide bonds to a terminal hydroxyl group of unsaturated polyurethane to form a polymer; carrying out sulfydryl-alkene click reaction on the polymer and a multi-sulfydryl compound to obtain the self-repairing polyurethane based on the dynamic disulfide bonds. The preparation method ofthe self-repairing polyurethane is novel; the plurality of diisocyanates are introduced into unsaturated polyester with low molecular weight, the number of intermolecular hydrogen bonds is increased,improvement of the self-repairing performance of polyurethane is facilitated, meanwhile, amido bonds generated through the reaction of carboxyl and isocyanate groups are used for endowing the polyurethane with the advantages of high mechanical strength and good toughness, and the polyurethane with great self-repairing capacity and mechanical strength is prepared.

Description

technical field

[0001] The invention relates to a method for preparing polyurethane, in particular to a method for preparing self-healing polyurethane based on hydrogen bonds and dynamic disulfide bonds, and belongs to the field of polymer preparation. Background technique

[0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] Polyester polyol is a kind of polymer prepared by polycondensation reaction of polycarboxylic acid and polyol. It is the most commonly used and most important synthetic raw material for polyurethane, because in the process of polyurethane synthesis, polyester polyol can provide polyurethane Flexible soft segment, which endows polyurethane with excellent performance. As the so...

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