Preparation of self-healing coating based on waterborne acrylic resin and ethyl cellulose microcapsule

Self-healing coatings are interested because of their improved corrosion resistance in many applications. Microencapsulation is a physical immobilization technology where an activematerial (core) is encapsulated by a membrane (shell). In selfhealing applications, these microcapsules are designed tobreak at a prescribed level of external stimulus, resulting in the release of the core (healing) material. In recent years, synthetic microcapsules encapsulating liquid healing agentswere used in thermoset resins to prepare self-healing composites [1]. However, an important challenge is that mostof the reported microcapsules are water-insoluble and cannot be used in waterborne coatings [2]. In this research, selfhealingcoatings based on waterborne acrylic resin are prepared and ethyl cellulose, a natural polymer, is used as the shell wall to make the microcapsules. Good compatibility and dispersion in water-based polymer matrix are the motivations for the use of this polymer in microcapsule preparation