▎ 摘　　要

NOVELTY - Self-healing microcapsule includes a capsule wall and a capsule core, the load strength of the capsule wall is 0.1-50 millinanometer, and the capsule core has fluidity and can undergo polymerization reaction when it meets water. USE - Self-healing microcapsule for anti-corrosion coating (all claimed). ADVANTAGE - The self-healing microcapsule is easy to be damaged under the action of external force, and the capsule core wrapped by the capsule wall can flow out and undergo polymerization reaction when meeting water, and automatically fill coating cracks, to realize the rapid repair of coating cracks. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing self-healing microcapsules, which involves mixing water, emulsifier and optional surfactant to obtain emulsion (A), mixing isocyanate and/or its derivatives, optional graphene and/or its derivatives to obtain mixed solution (B), Under interfacial reaction conditions, and contacting emulsion (A), the mixed solution (B) with polyurethane.