A self-healing polyurethane based on hydrogen bond and dynamic disulfide bond, its preparation method and application

Abstract

The invention belongs to the field of polymer preparation, and relates to a self-healing polyurethane based on hydrogen bonds and dynamic disulfide bonds, a preparation method and application thereof. Including: introducing multiple diisocyanates into low-molecular-weight unsaturated polyesters to form unsaturated polyurethanes terminated by hydroxyl groups; then grafting prepolymers containing isocyanate groups and dynamic disulfide bonds on the terminal hydroxyl groups of unsaturated polyurethanes , forming a polymer; the polymer undergoes a mercapto-ene click reaction with a multimercapto compound to obtain a self-healing polyurethane based on a dynamic disulfide bond. The preparation method of the self-healing polyurethane described in the present invention is novel. By introducing a plurality of diisocyanates into the low-molecular-weight unsaturated polyester, the number of intermolecular hydrogen bonds is increased, which is conducive to improving the self-healing performance of the polyurethane. At the same time, the use of carboxyl groups and The amide bond generated by the reaction of isocyanate groups endows polyurethane with the advantages of high mechanical strength and good toughness, and prepares polyurethane with great self-healing ability and mechanical strength.

Description

A kind of self-healing polyurethane based on hydrogen bond and dynamic disulfide bond and preparation method thereof application technical field The present invention relates to the preparation method of polyurethane, be specifically related to a kind of self-repairing polymer based on hydrogen bond and dynamic disulfide bond A preparation method of urethane belongs to the field of polymer preparation. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and is not necessarily be deemed to acknowledge or imply in any form that this information constitutes prior art already known to those of ordinary skill in the art technique. Polyester polyol is a kind of polymer prepared by polyvalent carboxylic acid and polyol through polycondensation reaction. Urethane is the most commonly used and most important synthetic raw material, because in the process of pol...

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Problems solved by technology

However, the inventors found that it is difficult for the current self-healing polyurethane to have high mechanical strength and self-healing cycles at room temperature.

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