摘要：利用KH-550硅烷對金紅石型納米TiO₂ 的表面進行了包覆處理，研究了使用不同分散劑的條件下,未包覆和經包覆的納米TiO₂  粉體在ECL-GC-7航空清漆中的分散性。將經過包覆的納米TiO₂  加入到ECL-GC航空涂料中進行改性，表征了改性涂層的紫外光吸收和抗老化性能。研究發現，通過包覆處理并配合使用R912分散劑,航空清漆中納米粉體出現可目視觀察的初始沉淀時間在4h以上,粉體的穩定分散狀態可以保持到200h以上。經納米TiO₂  改性后，涂層的紫外光吸收能力和抗老化性能均有所提高。在納米TiO₂ 添加量為2.0%(質量分數)時，改性涂料的性價比較佳。

       Abstract：The surface cladding treatment of nano-sized rutileTiO₂ was carried out with KH-550 silane as cladding reagent.The dispersibilities of the original and treated nano TiO₂  powder in the ECL-GC-7 aerial varnish were studied.NanoTiO₂ modified coating was then prepared by adding the treated nano TiO₂  powder into the ECL-GC aerial coating.The ultraviolet light absorotion and ageing resistance properties of the modified coating layer were characterized as well.It was found that the initial precipitationa of the nano-sized particles in the aerial varnish can be visual inspected after 4h,and stable dispersed state of the poeder can be maintained up to 200h with adoption of the cladding treatment ahd adding of R912 dispersant.After being modified by nano TiO₂ ,the ultraviolet light absortion and ageing resistance properties of the coating layer are improved.In addition,the cost-performance ratio of the modified coating are comparatively good when the level of addition of nanoTiO₂ gets to 2.0wt%.

       Key Word：cladding treatment,dispersilbility,ultraviolet light absorption,aerial coating