Construction of Rosin‐Based Polyurea Coating With Self‐Healing, Anti‐Corrosion, and Solvent‐Resistant Properties

ABSTRACT Given the increasing depletion of petrochemical resources and the intensification of environmental issues, the development of high‐performance bio‐based functional materials is crucial for achieving sustainable development. This study utilized renewable rosin as the raw material. Rosin‐based ester was prepared through an esterification reaction with glycidyl methacrylate, which was subsequently reacted with diisocyanate of different structures (aromatic/alicyclic) to synthesize a series of rosin‐based polyurea materials containing dynamic urea bonds. The influence of diisocyanate type on the material properties was systematically investigated. The results indicate that polyurea constructed from alicyclic diisocyanate exhibited superior comprehensive performance. Benefiting from the synergistic reversible effects of the dynamic urea bonds and hydrogen bonds within the material, the resulting materials not only demonstrate good mechanical properties (tensile strength reaching 4.29 MPa) but also possess excellent self‐healing capabilities (scratches could be completely repaired within 6 h at 100°C). Additionally, these materials combine good thermal stability with coating performance. This study provides an effective strategy for developing self‐healing bio‐based polymeric materials.