苯胺－对苯二胺共聚物改性水性聚氨酯－丙烯酸酯涂层的制备及防腐性能研究

Study on the preparation and anticorrosion of waterborne polyurethane-acrylate coating modified by P-phenylenediamine-aniline

采用微乳液聚合法合成苯胺-对苯二胺共聚物P(ANI-PDA),采用原位乳液聚合法制备水性聚氨酯-丙烯酸酯复合乳液(WPUA),根据物理共混法制备出苯胺-对苯二胺共聚物/水性聚氨酯-丙烯酸酯复合涂层P(ANI-PDA)/WPUA。采用原子力显微镜(AFM)、热重分析(TGA)、吸水率测试、电化学测试和盐雾实验对P(ANI-PDA)/WPUA的形貌、热稳定性和防腐性能进行了表征和测试,研究了P(ANI-PDA)用量对涂层防腐性能的影响。结果表明,随着P(ANI-PDA)用量的增加,胶膜的热稳定性提高,乳胶粒粒径增大,当P(ANI-PDA)用量为1.5%时,胶膜的吸水率最低为4.1%,腐蚀电位为-1.034V,腐蚀电流密度为2.75×10^(-7) A·cm^2,耐盐雾最好,防腐性能最佳。

P-phenylenediamine-aniline copolymer P（ANI-PDA） was synthesized by micro-emulsion polymerization; waterborne polyurethane- acrylate composite emulsion （WPUA） was prepared by in-situ emulsion polymerization; P（AN1-PDA）/WPUA were prepared according to the physical blending method. The thermal ability and morphology of P（ANI-PDA）/WPUA were characterized by TGA and AFM, the anticorrosion properties of composite coatings were studied by water absorption, Spray salt test and electrochemical test, and the anticorrosion properties of coatings with different contents P（ANI-PDA） were studied. The results showed that the crystailinity of P（ANI-PDA） is high; the latex particle diameters were increased ,the thermal ability were improved with increasing the content of P（ANI-PDA） ,when P（ANI-PDA） in an amount of 1.5%, the coating displays the best salt spray resistance and anticorrosion property, the water absorption of films is 4.1%, the corrosion potential is -1.034 V, the corrosion current density is 2.75 × 10^-7 A· cm2.