聚苯胺/水性聚氨酯复合涂膜制备及防腐性能

Preparation and Corrosion Resistance of Polyaniline and Waterborne Polyurethane Composite Coating Film

采用苯胺(AN)、十二烷基苯磺酸(DBSA)和过硫酸铵(APS)为主要原料制备了聚苯胺颗粒,并对其进行了扫描电镜(SEM)、X射线衍射谱图(XRD)和傅里叶变换红外光谱(FT-IR)表征。再结合聚乙二醇(PEG600)、二苯基甲烷二异氰酸酯(MDI)、二羟甲基丙酸(DMPA)、N-甲基吡咯烷酮(NMP)和二月桂酸二丁基锡(DBTDL)等主要原料制备了聚苯胺/水性聚氨酯复合涂膜(PANI-WPU),通过红外光谱对其结构和性能进行表征。探讨了PANI含量对涂膜力学性能影响,研究了涂层的吸水性、光泽度、电化学防腐和耐酸碱等性能。结果表明,聚苯胺/水性聚氨酯涂膜的抗拉强度最大可达到23 MPa,延伸率达到1012%,铅笔硬度5H,柔韧性2 mm,耐冲击性为50 cm,吸水率14.66%,光泽度在60°时达到99.9%。当PANI掺量为0.7%时,能够提高复合膜的力学性能、光泽度和防腐性能。由电化学极化曲线和阻抗谱图分析得到,添加PANI的水性聚氨酯涂膜其缓蚀效率可达到99.74%。将0.7%掺量的PANI-WPU复合材料涂敷在封边的马口铁板上,在10%的H2SO4和10%的NaOH溶液中浸泡90 d,不掉漆,可以起到很好的耐酸碱防护效果。

Polyaniline particles were prepared from aniline(AN),dodecyl benzene sulfonic acid(DBSA)and ammonium persulfate(APS),and characterized by SEM、XRD and FT-IR method.Combined with polyethylene glycol(PEG600),diphenylmethane diisocyanate(MDI),dimethylol propionic acid(DMPA),N-methylpyrrolidone(NMP)and dibutyltin lauric acid(DBTDL),polyaniline/waterborne polyurethane composite films(PANI-WPU)were obtained,and its structure and properties were characterized by FT-IR spectrum.The influence of PANI content on the mechanical properties of the coating film was explored,and the water absorption,glossiness,electrochemical corrosion resistance,and acid and alkali resistance of the coating were investigated.The results show that the maximum tensile strength of polyaniline/waterborne polyurethane film can reach 23 MPa,the elongation can reach 1012%,the pencil hardness is 5H,the flexibility is 2 mm,the impact resistance is 50 cm,the water absorption is 14.66%,and the glossiness can reach 99.9%at 60°.When the PANI content is 0.7%,it can improve the mechanical properties and glossiness of the com-posite film.When the PANI content is 0.7%,it can improve the mechanical properties,glossiness,and anti-corrosion performance of the composite film.According to the analysis of electrochemical polarization curves and impedance spectra,the corrosion inhibition effi-ciency of the waterborne polyurethane coating film with PANI can reach 99.74%.The PA-NI-WPU composite material with 0.7%content is coated on the tinplate with edge sealing,and it can be soaked in 10%H2SO4 and 10%NaOH solution for 90 d without peeling off the paint,which can play a very good acid and alkali resistance protection effect.