Study on the properties of self-healing epoxy coating based on Pickering emulsion system

Abstract

In this study, Pickering emulsion template method and interfacial polymerization method are used to prepare microcapsules containing tung oil with Polyvinyl alcohol (PVA) as stabilizer, PUA as wall material and tung oil as core material. Microcapsules are structured and spherical, with uniform size distribution. The prepared microcapsules were dispersed in epoxy resin to form a self-healing epoxy coating. The effect of brine soaking time on the corrosion resistance of the self-healing epoxy coating was studied. EIS results showed that the self-healing epoxy coating with microcapsules had better corrosion resistance than pure epoxy resin. The mechanical properties of the self-healing epoxy coating with microcapsule content were studied by measuring the tensile strength, tensile shear strength and coating hardness. When the microcapsule content was 3%, the tensile strength increased to 84.71 MPa, which was 35.53% higher than that of pure epoxy resin. The hardness of self-healing epoxy coating is 22.46 HV, which is 0.18% lower than that of pure epoxy coating. The experimental results show that a small amount of microcapsules can improve the mechanical properties of the self-healing coating.