WO_(4)^(2-)插层的Zn-Al层状双氢氧化物对水性涂料防腐性能的提升

Improvement of the anticorrosion performance of waterborne coatings by WO_(4)^(2-)-intercalated Zn-Al layered double hydroxides

利用离子交换法制备了WO_(4)^(2-)插层的Zn-Al层状双金属氢氧化物(LDH-WO_(4)^(2-)),并将其添加到水性环氧树脂中以改善水性涂料的屏蔽性能与耐腐蚀性能。利用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)和扫描电子显微镜(SEM)对LDH-WO_(4)^(2-)进行了表征,结果表明成功制得结构完整、尺寸均一的LDH-WO_(4)^(2-)。使用盐雾试验和浸泡试验研究了添加不同浓度LDH-WO_(4)^(2-)的水性涂料的耐腐蚀性能。结果表明,在水性涂料中添加适量的LDH-WO_(4)^(2-)可以有效提高水性涂层的屏蔽性能与耐腐蚀性能,当LDH-WO_(4)^(2-)的添加浓度为3%(LDH-WO_(4)^(2-)占水性环氧树脂的质量分数)时,水性涂层的防护性能最好。

WO_(4)^(2-)-intercalated Zn-Al layered double metal hydroxides(LDH-WO_(4)^(2-))have been prepared by an ion-exchange method and added to waterborne epoxy resin in order to improve the shielding performance and corrosion resistance of waterborne coatings.The LDH-WO_(4)^(2-)was characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR)and scanning electron microscopy(SEM).The results showed that LDH-WO_(4)^(2-)with uniform particle size was successfully prepared.The corrosion resistance of waterborne coatings with different loadings of LDH-WO_(4)^(2-)was studied in salt spray tests and immersion tests.The results showed that the addition of LDH-WO_(4)^(2-)to waterborne coatings in an appropriate amount can effectively improve their shielding performance and corrosion resistance.When the loading of LDH-WO_(4)^(2-)was 3%(the mass fraction of LDH-WO_(4)^(2-)in the waterborne epoxy resin),the waterborne coating was found to have the best protective performance.