Abstract This study reports for the first time the preparation of almond oil-based microcapsules using phosphorylated ethyl cellulose as shell material. Microcapsules of ethyl cellulose (EC) and phosphorylated ethyl cellulose (P-EC) containing almond oil as anti-corrosion inhibitor, for end use in self-healing coatings, were prepared by a solvent evaporation method. The results showed that phosphorus content in the modified ethyl cellulose was 6.26 wt.%, the specific surface area reached a high value of 21.4 m2 g−1 and a char residue of 18 wt.% at 400 °C after thermal degradation. Both prepared EC and P-EC based microcapsules were spherical shape-like. The scanning electron microscope (SEM) images showed that the freeze-drying influences the microcapsules surface morphology. The mean diameter of EC and P-EC microcapsules was about 140 μm and 150 μm, respectively. Anti-corrosion properties of prepared epoxy-based coatings loaded with microcapsules on the mild steel substrate were evaluated for 28 days using a simple salt spray test. The sample containing P-EC microcapsules showed the best anticorrosion resistance. The functionalization of the ethyl cellulose microcapsules shell with phosphonate groups can improve further the anti-corrosion resistance, the flame-retardant ability and the metal chelating properties of the final coatings.

中文翻译：

---

基于磷酸化乙基纤维素微胶囊的防腐涂料的研制

摘要 本研究首次报道了以磷酸化乙基纤维素为壳材料制备杏仁油基微胶囊。通过溶剂蒸发法制备了含有杏仁油作为抗腐蚀抑制剂的乙基纤维素 (EC) 和磷酸化乙基纤维素 (P-EC) 微胶囊，最终用于自修复涂层。结果表明，改性乙基纤维素中的磷含量为 6.26 wt.%，热降解后的比表面积高达 21.4 m2 g-1，在 400 °C 下热降解后的焦炭残留量为 18 wt.%。制备的 EC 和 P-EC 基微胶囊均为球形。扫描电子显微镜 (SEM) 图像显示冷冻干燥会影响微胶囊的表面形态。EC 和 P-EC 微胶囊的平均直径分别约为 140 μm 和 150 μm。使用简单的盐雾试验评估了在低碳钢基材上装载有微胶囊的制备的环氧基涂料的防腐性能 28 天。含有 P-EC 微胶囊的样品表现出最好的耐腐蚀性。乙基纤维素微胶囊壳的膦酸酯基官能化可以进一步提高最终涂层的耐腐蚀性、阻燃性和金属螯合性能。