添加纳米SiO2空芯微球的水性丙烯酸涂料性能研究

Performance of Waterborne Acrylic Coatings with Nanometer SiO2 Microspheres

目的将纳米SiO2空芯微球加入水性丙烯酸成膜物中,制备出一种性能优异的水性丙烯酸涂料。方法采用扫描电子显微镜(SEM)、拉开法附着力测试、氙灯加速老化试验、酸性盐雾试验、电化学交流阻抗(EIS)等方法对涂层的微观形貌、常规力学及电化学性能进行系统性研究。结果SEM形貌表明,添加的玻璃微球与成膜物之间具有良好的相容性和稳定性,改性后的涂层在常温和高温环境下具有较好的附着力。盐雾试验和氙灯加速老化试验结果进一步显示改性后的涂层具有较好的耐老化性能,在酸性环境下有着较好的耐蚀性能。从电化学交流阻抗对比结果可明显观察到添加微球的水性丙烯酸涂层耐腐蚀性能提高了50%。结论将纳米SiO2微球加入水性丙烯酸成膜物中,可有效改善水性丙烯酸涂料的环境适应性,同时能够有效提升其防腐性能。

Objective To prepare a waterborne acrylic coating of good performance by adding nano-SiO2 hollow core mi- crospheres into the film-forming material of water-based acrylic acid. Methods The microscopic morphology property, conven-tion mechanics performance and electrochemical property of the prepared coatings were investigated by scanning electron mi-croscopy (SEM), pull adhesion test, xenon accelerated aging test, acid salt spray test, and electrochemical impedance spectros-copy (EIS). The SEM morphology showed that the nano-SiO2 microspheres had excellent compatibility and stability with the film-forming material. The Modified coating had good adhesion in normal and high temperature conditions. The results of acid salt spray test and accelerated aging test of xenon lamp showed that the modified coating had good aging resistance and good corrosion resistance in acid environment. Compared with the EIS results, it was obvious that the corrosion resistance of the wa-ter-based acrylic coating with the addition of microspheres was increased by 50%. Conclusion Adding nano-SiO2 microspheres into the aqueous acrylic film-forming material could significantly enhance the environmental adaptability and improve its anti-corrosion performance at the same time.