PUF/PANI-C.O.双壁微胶囊的制备及其改性水性环氧涂层防腐性能研究

Preparation of puf/pani-c.o. double-walled microcapsules and study on anticorrosion performance of modified waterborne epoxy coating

摘要:

以蓖麻油（C.O.）为芯材，脲醛树脂（PUF）和聚苯胺（PANI）为壁材，采用原位聚合法和物理沉积法制备了PUF/PANI-C.O.双壁微胶囊，并将其添加到水性环氧涂层（WEC）中制备PUF/PANI-C.O./WEC复合涂层。通过FTIR、XRD和SEM测试对PUF-C.O.单壁和PUF/PANI-C.O.双壁微胶囊的成分和形貌结构进行表征；除此之外，采用电化学阻抗谱（EIS）和盐雾实验研究微胶囊改性水性环氧复合涂层的腐蚀行为。结果表明，PANI成功包覆在PUF-C.O.单壁微胶囊表面，形成PUF/PANI-C.O.双壁微胶囊。与纯WEC和PUF-C.O./WEC相比，PUF/PANI-C.O./WEC在长期腐蚀测试中表现出更正的腐蚀电位（~0.15V）和较高的低频阻抗值（~109 Ω·cm2），且金属基体的腐蚀程度最浅，表现出最佳的防腐性能。

Abstract:

PUF/PANI-C.O. double-walled microcapsules were prepared by in-situ polymerization and physical deposition method using castor oil (C.O.) as core material, urea-formaldehyde resin (PUF) and polyaniline (PANI) as wall materials, and added to waterborne epoxy coating (WEC) to prepare PUF/PANI-C.O./WEC composite coating. The composition and morphology of PUF-C.O. single-walled and PUF/PANI-C.O. double-walled microcapsules were characterized by FTIR, XRD and SEM. In addition, the corrosion behavior of microcapsule modified waterborne epoxy composite coating was studied by electrochemical impedance spectroscopy (EIS) and salt spray test. The results showed that PANI was successfully coated on the surface of PUF-C.O.single-walled microcapsules to form PUF/PANI-C.O.double-walled microcapsules. Compared with pure WEC and PUF-C.O./WEC, PUF/PANI-C.O./WEC exhibited more positive corrosion potential (~0.15 V) and higher low-frequency impedance value (~109 Ω·cm2) in long-term corrosion test, and the corrosion degree of the metal matrix was the lightest, showing the best corrosion resistance.