Two-component polyurethane adhesive based on diels-alder dynamic covalent structure and preparation method and application thereof

Abstract

The application discloses a two-component polyurethane adhesive based on a Diels-Alder dynamic covalent structure and a preparation method and application thereof. The method is as follows: using a constant temperature magnetic stirrer, polyether and diisocyanate are fully mixed under a solvent-free condition, a catalyst is added, and a polyurethane prepolymer is obtained by reaction, serving as an A component; using a constant temperature magnetic stirrer, a chain extender is synthesized by reaction in a solvent, the chain extender is fully mixed with a crosslinking agent, and the solvent is removed in a vacuum oven to obtain a dihydric alcohol mixture, serving as a B component; the A component and the B component are uniformly mixed to obtain the polyurethane adhesive. The adhesive contains the Diels-Alder dynamic covalent structure, has dissociable characteristics, has high lap shear strength, has a mild bonding temperature, and has an easy-to-achieve dissociation temperature, and can avoid damage to a substrate during bonding and dissociation, and has a good application prospect in the fields of automobile assembly, electronic device packaging, composite material bonding and the like.

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