改性聚氨酯乳液在铁质文物保护中的应用

对一种聚酯型聚氨酯乳液进行改性作为铁质文物复合封护剂，即通过添加缓蚀剂作为底层封护剂，添加TiO₂，SiO₂纳米颗粒作为面层封护剂，并通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）和紫外分光光度计等测试了改性后封护剂的性能。研究结果表明，添加缓蚀剂的底层封护剂对基体起到明显的防蚀作用，改性后的纳米复合封护剂的耐紫外线、耐酸、碱、盐等主要性能有了明显提高，复合封护涂层无色、透明、无光，符合铁质文物保护要求。

Improvement of preservation of iron relics with polyurethane emulsion by adding assistant

A new composite protective technique for iron relics was made up of bottom and top coats. Polyurethane emulsion added corrosion inhibitors was used as the bottom coat and the nanoparticles of TiO_2 and SiO_2 were dispersed in the polyurethane emulsion to form the top coat.The properties were assessed by Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM) and Ultraviolet Spectroscopy, etc. The results show that the bottom coat by adding corrosion inhibitors and the top coat by adding nano-materials have excellent ultraviolet resistance and corrosion resistance and result in a good protection of iron relics.