Abstract

The contributions of castor seed oil (CSO) as a useful, nontoxic, and sustainable base material for coating systems cannot be overemphasized. This paper took advantage of the predominant fatty acid composition in CSO (i.e., ricinoleic acid). It blended a synthesized crosslinker, poly(epichlorohydrin-triol) (PECH-triol), in percentages within its polymeric matrix. Physicochemical and spectroscopic (FTIR, ¹H-NMR, and ¹³C-NMR) examinations were carried out on the polyols. Thermal stability, hydrophobicity, anticorrosion, mechanical, and antibacterial properties of the prepared polyurethane (PU) coatings were examined. The 20% PECH-triol–CSO-PU film having its T_ON and T_END at 230.5 and 511.0°C, respectively, showed improved thermal stability when compared with the pristine film (CSO-PU). The derivative of TGA reveals a three-stage degradation step. Hydrophobicity was seen to increase from 73.3° to 92.2°, a reflection of the crosslinking effect of PECH-triol within the urethane matrix. The improved adhesion of 20% PECH-triol–CSO-PU coating on mild steel gave a better chemical resistance.

Graphic abstract

中文翻译：

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聚表氯醇三醇对蓖麻籽油基涂料聚氨酯聚合物基体的特定交联作用

摘要

蓖麻籽油（CSO）作为有用，无毒，可持续的涂料体系基础材料的贡献不可小视。本文利用了CSO中主要的脂肪酸成分（即蓖麻油酸）。它在其聚合物基体中以一定百分比共混了合成的交联剂，聚（环氧氯丙烷-三醇）（PECH-三醇）。对多元醇进行了物理化学和光谱学（FTIR，¹ H-NMR和¹³ C-NMR）检查。检查了制备的聚氨酯（PU）涂层的热稳定性，疏水性，防腐性，机械性能和抗菌性能。20％的PECH-三醇-CSO-PU膜的T _ON和T _END与原始膜（CSO-PU）相比，分别在230.5和511.0°C的温度显示出改善的热稳定性。TGA的衍生物揭示了一个三阶段降解步骤。疏水性从73.3°增加到92.2°，反映了PECH-三醇在聚氨酯基质中的交联作用。20％PECH-三醇-CSO-PU涂层在低碳钢上的附着力得到改善，从而具有更好的耐化学性。

图形摘要