水性转锈防腐涂料的设计合成与性能研究

Synthesis and performance research of waterborne anti-corrosive coatings

采用没食子酸为原料合成具有转锈功能的烯基单体,P_2O_5作为磷酸化试剂合成磷酸酯功能单体,之后采用种子乳液聚合方法,将其与丙烯酸酯进行共聚,制备了一种高分子水性带锈转锈涂料.通过扫描电镜、能谱仪、盐水浸泡法和Tafel极化曲线考察其成膜性能以及对钢铁的防腐性能.结果表明,该水性涂料将钢铁表面的铁锈转化为成膜物覆盖在钢铁表面,30min膜层变黑,涂膜附着力为1级,在3.5%NaCl水溶液中浸泡72h后涂膜几乎没有改变;在不同pH3.5%NaCl溶液中,涂膜的腐蚀电位高于裸电极,相同频率下阻值密度小于裸电极,具有良好的耐腐蚀性能;乳液粒径为86nm,分布指数小,乳液粒径分布均一,具有良好的附着性;转锈后锈层表面平整、结构紧密,可以有效阻止锈蚀,而且涂层成膜性能良好.

With P_2O_5 as phosphorylation agent to synthesize phosphate ester monomers,and adding rust conversion agent,which was synthesized by using gallic acid.And copolymerization with acrylate,the seed emulsion polymerization method was prepared a polymer aqueous rusty rust coating.The film performance and the anti-corrosion properties of the steel rust was detected by scanning electron microscope,energy spectrometer,salt water immersion method and Tafel polarization curve.The results show that the coating film rust on the surface of the steel can be converted in a film to cover on the steel surface,30 min blackening film layer,and adhesion for level 1,soaking in 3.5%,NaCl aqueous solution at after 72 h coating is almost did not change.In different pH of 3.5% NaCl solution,emulsion coating corrosion potential of the emulsion film is higher than transfer coating,rust agent were significantly higher than the bare electrode corrosion potential,with good corrosion resistance.The size of emulsion particle is 86 nm,distribution index is small,the emulsion particle size distribution is uniform,with good adhesion.Rust layer surface level off and structure compact after rust,which can effectively prevent corrosion and coating film performance is good.