聚(苯胺-氟苯胺)共聚物/环氧树脂防腐涂层的制备及性能

Preparation and Properties of Poly(aniline-fluoroaniline)Copolymer/Epoxy Resin Anticorrosive Coatings

环氧树脂涂料已广泛应用于金属腐蚀保护,然而其单一使用的防腐性能无法满足应用需求,将高性能防腐填料添加到环氧树脂基体中制备复合涂层是一种有效改善防腐性能的方法。本文通过微乳液聚合法合成苯胺与氟苯胺共聚物(PANI-FAN),将其作为防腐填料加入环氧树脂,改善环氧树脂的防腐性能。通过傅立叶变换红外光谱法(FTIR)、X射线衍射仪法(XRD)和扫描电子显微镜法(SEM)对PANI-FAN的结构和形貌进行表征,通过电化学阻抗谱和盐雾试验探究PANI-FAN的添加量对环氧树脂防腐性能的影响。结果表明,成功合成了纳米级的PANI-FAN共聚物,合成的共聚物具有良好的疏水性,其水接触角达到148.7°,接近超疏水状态。在质量分数3%的PANI-FAN填料负载下,在质量分数3.5%NaCl溶液中浸泡60 d,PANI-FAN/EP复合涂层在低频下的阻抗值(|Z|0.01Hz)仍达到109Ω/cm^(2),比原始环氧涂层提高了近3个数量级。

Epoxy resin coating has been widely used in the metal corrosion protection,but its single corrosion resistance cannot meet the application needs,adding high-performance anticorrosive filler to the epoxy resin matrix to prepare composite coating is an effective way to improve the corrosion resistance.In this paper,poly(aniline-fluoroaniline)(PANI-FAN)was synthesized by the microemulsion polymerization,and it was added as an anticorrosive filler to improve the corrosion resistance of epoxy resin.The structures and morphologies of PANI-FAN were characterized by Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD)and scanning electron microscopy(SEM).The effects of PANI-FAN content on the corrosion resistance of epoxy resin were investigated by electrochemical impedance spectroscopy and salt spray test.The results show that the nano-sized PANI-FAN copolymer is successfully synthesized.The synthesized copolymer has a good hydrophobicity,and its water contact angle reaches 148.7°,which is close to the superhydrophobic state.After immersion in a 3.5%mass fraction NaCl solution for 60 d,the impedance value of PANI-FAN/EP composite coating at low frequency(|Z|0.01Hz)still reaches 109Ω/cm^(2) with the loading of a 3%mass fraction PANI-FAN filler,which is nearly three orders of magnitude higher than that of the original epoxy coating.