纳米SiO_2的改性及其对水性聚氨酯树脂复合涂层性能的影响  

Modification of Nano-SiO_2 and Its Effect on the Properties of Waterborne Polyurethane Resin Coating

作　　者：汤晓东[1] 张振海[1] 徐丽萍[1] 杨兴亮[2] 张千峰[1] 

机构地区：[1]安徽工业大学分子工程与应用化学研究所,马鞍山243002 [2]马鞍山钢铁股份有限公司技术中心,马鞍山243000

出　　处：《表面技术》2013年第4期12-16,共5页Surface Technology

基　　金：科技部863计划新材料研究专题(2009AA03Z529)

摘　　要：在乙醇水溶液中,用硅烷偶联剂KH560对纳米SiO2进行表面改性处理,通过测定粒径,探讨了纳米SiO2含量、乙醇水溶液配比以及改性剂含量对分散性的影响。将改性后的纳米SiO2分散液、水性聚氨酯树脂及无机组分等复配成无铬钝化液,在热镀锌板上制备钝化膜,通过电化学Tafel极化曲线、交流阻抗以及中性盐雾试验对比纳米SiO2改性聚氨酯复合钝化膜和未改性聚氨酯复合钝化膜的耐蚀性,结果表明,与后者相比,前者的耐腐蚀性能有了较大的提升。In aqueous ethanol solution,the surface of nano-SiO2 was modified by silane coupling agent KH560.And the particle sizes were measured.The effects of nano-SiO2 content,alcohol percentages and the modification agents on dispersity were discussed.The chromium-free passivation solution was made from the modified nano-SiO2 dispersions,water polyurethane resin and inorganic constituent compound,and it may be coated on the hot galvanized sheet.Corrosion resistances of nano-SiO2 modified polyurethane composite passivation film and unmodified polyurethane composite passivation film were characterized by the electrochemical Tafel polarization curves,AC impedances（EIS） and the neutral salt spray tests.The results may show that compared with the latter the former corrosion resistance have been greatly improved.

关 键 词：纳米SIO2改性 粒径 水性聚氨酯树脂 电化学 耐蚀性 

分 类 号：TG174.46[金属学及工艺—金属表面处理]