摘要： 为研究超分散剂对光固化涂料体系云母分散性的影响，采用 4种不同超分散剂 BYK-111、BYK-168、BYK-2008、BYK-2025对云母进行改性，并通过沉降法、超景深显微镜、扫描电子显微镜、黏度法等进行表征，通过电化学阻抗谱（ EIS）、耐中性盐雾试验对 UV固化云母涂层的耐腐蚀性进行测试。结果表明：黏度法和扫描电子显微镜能反映云母在 UV固化树脂体系中的分散性能。 4种超分散剂中，聚氨酯型超分散剂 BYK-168改善云母在光固化涂层中分散性的效果最好，所构筑的光固化涂层耐腐蚀性也最为优异，浸泡在 3. 5%NaCl溶液中 1 200 h后，涂层的电化学阻抗值维持在 10⁹ Ω·cm²左右，整个浸泡过程中的下降幅度不超过 1个数量级，且经过 1 000 h的耐中性盐雾试验后，涂层仍然完好无损，没有任何腐蚀现象。

关键词: 光固化涂料, 云母, 超分散剂, 耐腐蚀性, 盐雾试验

Abstract: In order to study the influence of hyperdispersants on the dispersion of mica in UV-curable coatings system，mica was modified by four hyperdispersants including BYK-111，BYK-168，BYK-2008，BYK-2025. The dispersion of the modified mica fillers in UV-
curable coatings was investigated by sedimentation method，ultra-depth of field microscope，scanning electron microscope（SEM）and viscosity method. The corrosion resistance of UV-curable mica coating was tested by electrochemical impedance spectroscopy（EIS）and neutral salt spray test. The results showed that the viscosity method and SEM could reflect the dispersion performance of mica in the UV-curable coatings. Among the four hyperdispersants，the polyurethane type hyperdispersant BYK-168 had the best performance for improving the mica dispersion in UV-curable coatings，and the constructed UV-curable coating had the best corrosion resistance. After soaking in 3. 5% NaCl solution for 1 200 h，the electrochemical impedance of the coating remained at about 10⁹ Ω·cm²，which decreased less than one order of magnitude in the whole soaking process. The coating remained intact without any corrosionafter 1 000 h of salt spray.

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