聚苯胺微乳液的制备及与叔氟丙烯酸酯乳液复合涂层的防腐性能

Preparation of Polyaniline Microemulsion and Anticorrosion Performance of Its Composite Coatings with VersatateFluoro-Acrylate Emulsion

以十二烷基硫酸钠(SDS)为乳化剂合成了能与丙烯酸酯类乳液混溶的聚苯胺(PANI)微乳液,然后将PANI微乳液混入叔碳酸乙烯酯改性的含氟丙烯酸酯(叔氟丙烯酸酯,VFAc)乳液中在Q235钢表面制备出复合防腐涂层。用红外光谱(FTIR)和透射电子显微镜(TEM)表征PANI的结构并测试PANI微乳液的粒径,研究了PANI微乳液与VFAc乳液的质量比对复合涂层疏水性、湿附着力及防腐蚀性能的影响。结果表明,当PANI微乳液与VFAc乳液质量比为1∶2时复合涂层有较好的疏水性和防腐蚀性能。提出了复合涂层的防腐蚀机理。

Polyaniline（PANI） microemulsion, which is miscible with acrylate emulsion, was synthesized with sodium dodecyl sulfate（SDS） as emulsifier. PANI/VFAc composite emulsions were prepared by blending PANI microemulsion and the versatate modified acrylate emulsion containing fluorine（versatate- fluoro- acrylate emulsion, VFAc）. Then PANI/VFAc composite emulsion was applied on Q235 steel surface to prepare the composite anticorrosion coatings. The molecular structure and particle size of PANI were characterized by Fourier transformation infrared spectrum（FT- IR）, transmission electron microscopy（TEM） and particle size analyzer. The influence of different proportion of PANI microemulsion and VFAc emulsion on properties such as hydrophobic, wet adhesion and anticorrosion of the formed coatings was studied. The results show that the composite coating exhibits the best hydrophobic property and corrosion resistance when the proportion of PANI microemulsion and VFAc emulsion is 1： 2. The anticorrosion mechanism of PANI/VFAc composite coating on Q235 steel was proposed.