▎ 摘　　要

NOVELTY - A self-testing capsule comprises a capsule wall and a capsule core includes a aqueous paint repair agent, and a color developer. USE - Self-testing capsule for aqueous anticorrosive coatings. ADVANTAGE - The color change is observed with the naked eye which plays a role of self-detection and early warning, and makes the micro-crack area easy to be located, indicating the location for the repair of the coating layer. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation of self-testing capsule, which involves (1) loading of the color developer, preparing a certain concentration of graphene aqueous dispersion, and then adding a certain proportion of the color developer to the graphene aqueous dispersion, ultrasonically dispersing, then filtering and drying, obtaining graphene as the color developing agent of the carrier, (2) using the graphene prepared in step (1) as the carrier of the color developer and the aqueous paint repairing agent to be uniformly dispersed and mixed in a solvent as a core material, and then forming polyurethane on the surface of the core material which is specifically composed of polyhydroxy or polyhydroxy, reacting amino compound with isocyanate to generate isocyanate derivatives, and then reacting with polyol to generate polyurethane.