研究了利用硅烷偶联剂改性纳米TiO2的方法,并通过FTIR、TEM等手段表征化学改性产物的结构和改性后纳米二氧化钛的分散性,结果表明偶联剂与二氧化钛表面发生化学偶联反应,使二氧化钛表面被偶联剂包覆,从而使二氧化钛改性产物在有机物中具有良好的分散性能.通过TEM分析用改性后的纳米TiO2原位合成的纳米TiO2/苯丙乳液复合体系具有以纳米TiO2粒子为核,以聚合物为壳的核壳结构,该乳液涂膜的耐水性达120h不泛白,硬度为H级,明显优于非纳米苯丙乳液,且具有很好的抑菌作用,可用于制备纳米水性涂料.
A process for modification of nanometer TiO2 by silane coupling agent was studied. The structure and the dispersibility of modified TiO2 were investigated by FTIR and TEM. The results showed that a chemical coupling reaction could take place between the coupling agent and TiO2 surface. As a result, the coupling agent was absorbed chemically on the surface of nanometer TiO2 to improve its dispersibility and stability in organics. Nanometer TiO2/styrene-acrylate composite emulsion was prepared by in-situ polymerization with modified TiO2. The TEM photograph indicated that the composite exhibited a core-shell structure with nanometer TiO2 as core and organic polymer as shell. The properties of composite emulsion were determined: water resistance of coating film of latex was 120h; hardness of coating film of latex was H grade, which was obviously superior to normal styrene-acrylate emulsion without nano-particles. Furthermore, this kind of nano-emulsion also owns perfect antibacterial characteristic. It could be used to prepare nanometer waterborne coatings.
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