Abstract Epoxy resin is widely used in metal surface protection, because of corrosion resistance and adhesion. However, it’s water solubility, oxygen, and water impermeability are not enough. In this paper, linoleic acid (LOFA) and epoxy resin (E20) were used to synthesize epoxy ester (EL) and grafted with phosphonate esterified acrylic resin (AR-P) to prepare acrylic grafted epoxy ester (EL@AR-P). After modification, water solubility and film-forming property were improved, and the oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) decreased. At the addition of PM-2 at 2%, the OTR, WVTR, and water-uptake rate decreased by 12.9%, 25.0%, and 12.1%, respectively. Subsequently, the modified material was subjected to electrochemical impedance spectroscopy. The low-frequency impedance of EL@AR-P2 is three times higher than EL@AR-P0. After 16 days of immersion, the low-frequency impedance of EL@AR-P2 is 20 times higher than EL@AR-P. Energy dispersive spectrometer and X-ray photoelectron spectroscopy results showed that the P elements were concentrated on the substrate surface and found the presence of P–O–Fe bonds, demonstrating that the phosphonate groups were migrated to the substrate surface to form a chelate layer with the substrate and enhancing the coating adhesion and corrosion resistance. This paper modifies the molecular structure of epoxy resin, which is expected to be an excellent material for anti-corrosion coatings.

中文翻译：

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膦酸酯化丙烯酸接枝环氧酯复合材料中膦酸酯基团的极性迁移行为及其在基材保护中的作用

摘要 环氧树脂由于耐腐蚀和附着力强，被广泛用于金属表面保护。然而，它的水溶性、氧气和水不渗透性是不够的。本文采用亚油酸（LOFA）和环氧树脂（E20）合成环氧酯（EL），并与膦酸酯化丙烯酸树脂（AR-P）接枝制备丙烯酸接枝环氧酯（EL@AR-P）。改性后水溶性和成膜性提高，透氧率（OTR）和水蒸气透过率（WVTR）降低。PM-2添加量为2%时，OTR、WVTR和吸水率分别下降12.9%、25.0%和12.1%。随后，对改性材料进行电化学阻抗谱分析。EL@AR-P2的低频阻抗是EL@AR-P0的三倍。浸泡16天后，EL@AR-P2的低频阻抗比EL@AR-P高20倍。能谱仪和 X 射线光电子能谱结果表明 P 元素集中在基板表面并发现 P-O-Fe 键的存在，表明膦酸酯基团迁移到基板表面形成螯合层基材，增强涂层附着力和耐腐蚀性。本文对环氧树脂的分子结构进行了改性，有望成为一种优良的防腐涂料材料。能谱仪和 X 射线光电子能谱结果表明 P 元素集中在基板表面并发现 P-O-Fe 键的存在，表明膦酸酯基团迁移到基板表面形成螯合层基材，增强涂层附着力和耐腐蚀性。本文对环氧树脂的分子结构进行了改性，有望成为一种优良的防腐涂料材料。能谱仪和 X 射线光电子能谱结果表明 P 元素集中在基板表面并发现 P-O-Fe 键的存在，表明膦酸酯基团迁移到基板表面形成螯合层基材，增强涂层附着力和耐腐蚀性。本文对环氧树脂的分子结构进行了改性，有望成为一种优良的防腐涂料材料。