掺杂型聚苯胺导电防腐涂料的制备与研究

Preparation and Study of Doped Polyaniline Conductive Anti-corrosion Coatings

以苯胺为单体,过硫酸铵为氧化剂,通过化学氧化法合成聚苯胺,并以其为导电填料,以环氧树脂为成膜物,制备出一种电导率在0-04-0-06 S/cm范围内的新型导电防腐涂料.讨论了氧化剂的用量、盐酸的浓度、反应时间和反应温度等对聚苯胺涂料导电性的影响以及在盐雾、酸性、碱性和油水条件下,其腐蚀情况和电导率的变化.结果表明：实验最佳制备条件为：氧化剂与苯胺的摩尔比1∶1,反应温度小于5℃,反应时间4h,盐酸浓度为2 mol/L,聚苯胺的质量分数为15％～20％;除碱性条件外,导电聚苯胺防腐涂料在油水、盐雾和酸性条件下均具有良好的导电性和防腐蚀性能.

Polyaniline were prepared by chemical oxidative method, with aniline as monomer and ammonium persulfateas oxidizing agent, and therefore a kind of novel corrosion resistant and conductive paint with conductivity of 0. 04 S/cmx0. 05S/cm was obtained with the PANI as conducting filler and epoxy resin as film-forming material. The effect of reactionconditions on the conductivity was discussed including the molar ratio of oxidant to aniline, the acidity, reaction temperatureand time as well as in the salt spray, acid, alkaline and oil-water conditions, the changes of polyaniline coating＇s corrosionand conductivity. The results show that ： the optimal reaction conditions are the ratio of oxidant and aniline is 1 ： 1, the reac-tion temperature is less than 5 ℃, the reaction time is 4 h, the concentration of HC1 is 2 moL/L and the weight percent ofPANI ranges from 15% to 20% ; In addition to alkaline condition, the conductive polyaniline anti-corrosion coatings havegood conductivity and corrosion resistance.