Preparation of Tung Oil‐Loaded PU/PANI Microcapsules and Synergetic Anti‐Corrosion Properties of Self‐Healing Epoxy Coatings

Abstract

Tung oil is used as a catalyst‐free repair agent. Tung oil‐loaded polyurethane (PU) microcapsules are prepared by interfacial polymerization in a SiO2‐stabilized Pickering emulsion system, polyaniline (PANI) is deposited in situ on the PU microcapsule surface, and tung oil‐loaded PU/PANI double‐layer shell microcapsules are obtained. Synthesized PU/PANI microcapsules showed the characteristic dark‐green color of conductive PANI. The average particle size is 31.1 ± 8.1 µm and the core content is 45.1 ± 4.3 wt%. The microcapsules have a good thermal stability, and the chemical structure of the PU/PANI wall and tung oil core is confirmed by Fourier transform infrared analysis. Self‐healing anti‐corrosion coatings are prepared by adding 10 wt% microcapsules into epoxy resin. The corrosion resistance properties of the self‐healing coating are evaluated by immersing scratched coatings in 10 wt% NaCl solution for 15 days. The self‐healing coating with 10 wt% tung oil‐loaded PU/PANI microcapsules have the best anti‐corrosion property, and slight corrosion do not occur until 15 days after immersion in salt solution. The self‐healing and anti‐corrosion mechanism are revealed. The tung oil core and the PANI wall of microcapsules contributed synergistically to the excellent self‐healing and anti‐corrosion properties of the coating through the formation of self‐healing films and passivation layers.

The Prospering of Macromolecular Materials Based on Plant Oils within the Blooming Field of Polymers from Renewable Resources

“…The materials exhibited good activity against Escherichia coli , indicating a good potential as, for example, antimicrobial coating materials. Recently, the design of tung oil-loaded polyurethane microcapsules covered with a double-layer shell of polyaniline was reported, and self-healing anti-corrosion coatings were prepared by adding 10 wt.% of these microcapsules into an epoxy resin [ 141 ].…”

High-Strength, Dimensionally Stable, and Flame-Retardant Fast-Growing Poplar Prepared by Ammonium Polyphosphate–Waterborne Epoxy Impregnation

“…Therefore, it is necessary to develop rapid treatments to improve the process of modifier entering the wood and shorten the preparation time. Epoxy resin is a type of excellent thermosetting resin which is widely used for its excellent heat resistance, moisture resistance, chemical resistance, mechanical properties, and adhesive properties. − At present, solvent-based epoxy resin is used as a functional coating, such as a flame retardant, an antibacterial, or for anti-corrosion coating on wood surfaces. The application is limited not only because of its short-term effectiveness but also due to its harm to the environment.…”

Facile Fabrication of Dual Functional Graphene Oxide Microcapsules Carrying Corrosion Inhibitor and Encapsulating Self-Healing Agent

“…The former two methods were usually employed to prepare microcapsules with polymeric shells. In situ polymerization in oil/water emulsion was employed to produce microcapsules with shells such as polyurea-formaldehyde [ 11 ], polyurethane [ 12 ], polyurea [ 13 ], and phenol formaldehyde [ 14 ]. The solvent evaporation phase separation method can be applied to encapsulate hexadecane by a wide range of polymeric shells including poly(1-lactide), poly(methyl methacrylate), poly(vinyl formal), poly(vinyl acetate), poly(2,6-dimethyl-1,4-phenylene oxide), poly(vinyl cinnamate) [ 8 ], and polystyrene [ 15 ].…”