Polyurethane (PU) coatings were prepared using polyesteramide polyols based on different types of vegetable oils and itaconic acid. Long chain fatty diethanolamides were synthesized using the amidation of linseed/castor/karanja oils and the desired hydroxyl group was introduced via esterification reaction with itaconic acid to yield polyesteramide polyols. Its structural elucidation was carried out using Fourier-transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (¹H NMR). The study of crosslinking these polyols with hexamethylene diisocyanate (HDI-trimer and HDI-biuret) shows that the isocyanate structure and functionality contribute to the final polyurethane coatings properties. Various optical, mechanical, and durability performance of the cured PU metal coating films were examined. The gel content method was used to compare the crosslink density of various PU films. The thermal properties of the PU coating, including stability and glass transition temperature (T_g), were assessed using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The corrosion resistance of PU coatings was analyzed by employing electrochemical impedance spectroscopy (EIS). PU metal coatings display superior gloss, adhesion, and chemical resistance properties. Differences in fatty acid compositions of linseed/castor/karanja oils were found to influence the air curing and mechanical and corrosion resistance properties of PU metal coatings. The use of itaconic acid and vegetable oils in the synthesis of these polyols contributes to their bio based characteristics and permits replacing the currently used petroleum-based polyols.

聚氨酯（PU）涂料是使用基于不同类型植物油和衣康酸的聚酯酰胺多元醇制备的。使用亚麻籽/蓖麻油/玉米kara子油的酰胺化反应合成长链脂肪二乙醇酰胺，并通过与衣康酸的酯化反应引入所需的羟基，以生成聚酯酰胺多元醇。使用傅立叶变换红外光谱（FT-IR）和质子核磁共振技术（¹1 H NMR）。对这些多元醇与六亚甲基二异氰酸酯（HDI-三聚体和HDI-缩二脲）进行交联的研究表明，异氰酸酯的结构和功能性有助于最终的聚氨酯涂料性能。检查了固化的PU金属涂膜的各种光学，机械和耐久性能。凝胶含量法用于比较各种PU膜的交联密度。PU涂层的热性能，包括稳定性和玻璃化转变温度（T _g使用热重分析（TGA）和差示扫描量热法（DSC）进行评估。通过使用电化学阻抗谱（EIS）分析了PU涂层的耐腐蚀性。PU金属涂料显示出优异的光泽，附着力和耐化学性。发现亚麻籽油/蓖麻油/魔芋油中脂肪酸组成的差异会影响PU金属涂料的空气固化性能，机械性能和耐腐蚀性。在这些多元醇的合成中使用衣康酸和植物油有助于它们的生物基特性，并允许替代当前使用的石油基多元醇。