采用聚氨酯改性环氧树脂为基料,环己酮、甲基异丁基酮和2-庚酮(MAK)为混合溶剂,三聚磷酸铝和磷酸锌、云母氧化铁红作为防锈颜填料,制备聚氨酯改性环氧树脂基防腐底漆,研究了基料、混合溶剂和防锈颜填料等因素对底漆防腐性能的影响.利用红外光谱、接触角测试、机械性能测试、电化学交流阻抗谱、耐腐蚀介质测试、单因素和正交试验等方法检测底漆的防腐性能.结果表明:混合溶剂质量比为5∶4∶1的清漆涂层阻抗为1.32×1010 Ω·cm2;颜基比(P/B)为0.8～0.9、三聚磷酸铝与磷酸锌质量比为6∶4、厚度为75～90 μm的色漆涂层阻抗高达2.1×10m Ω·cm2,涂层电容低至7.2× 10-11F/cm2;底漆具有优异的机械性能和防腐性能,能够满足石油储罐的防腐技术要求.
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