自分散聚苯胺/聚丙烯酸复合水性涂料的制备及其防腐蚀性能研究

Preparation and anti-corrosion properties of self-dispersed polyaniline/polyacrylic waterborne composite coatings

为了制备环境友好的金属防腐蚀涂层材料,采用化学氧化聚合方法制备了自分散β-环糊精掺杂聚苯胺（β-CD-PANI）,并将其与水性丙烯酸（PA）涂料复合,制得了β-环糊精掺杂聚苯胺/聚丙烯酸复合水性防腐蚀涂料。利用扫描电镜（SEM）和傅里叶红外光谱（FTIR）对β-CD-PANI的表面形貌和化学结构进行了分析。结果表明,β-CD-PANI为直径约200 nm,长度约200~400 nm的球形和短棒状颗粒。采用粒径分析和电化学测试考察了复合涂料的粒径分布和防腐蚀性能。结果表明,1%的β-CD-PANI的加入使复合涂料乳液粒子平均粒径增大约75 nm,同时其A3钢测试样片的腐蚀电位（E_（corr））较对比样升高约85 m V,腐蚀电流（I_（corr））也降低了将近1个数量级。

In order to prepare anti-corrosion coating materials for metal protection,self-dispersed β-cyclodextrindoped polyaniline（ β-CD-PANI） is synthesized by chemical oxidation polymerization. Then,β-CD-PANI is composited with waterborne polyacrylic to prepare β-cyclodextrin-doped polyaniline / polyacrylic（ β-CD-PANI / PA） composite coating. The morphology and structure of β-CD-PANI are characterized by scanning electron microscope（ SEM） and Fourier-transform infrared spectra（ FTIR）. The results show that β-CD-PANI is spherical or rob-likes with about 200 nm in width and 200- 400 nm in length. The particle size distributions and anti-corrosion properties of the composite coating are tested by particle size analyses and electrochemical tests,respectively. The results exhibit that mean particle diameter of composite emulsion containing 1% β-CD-PANI is increased by about 75 nm. Besides that,the corrosion potential（ E_（corr）） of A3 steel samples coated with composite coating is higher than that of reference samples by about 85 m V,while the corrosion current（ I_（corr）） is decreased by nearly 1 order of magnitude.