TiO_2/Ag抗菌剂的表面改性研究

Surface Modification of TiO_2/Ag Antimicrobial Agent

为提高载银纳米二氧化钛抗菌粉体在亲油性高分子材料中的分散性,采用硅烷偶联剂KH570、顺丁烯二酸酐、磷酸三辛酯、对羟基苯甲酸丁酯对载银二氧化钛粉体进行了表面改性。利用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)等对改性前后的抗菌粉体的形貌和成分进行了表征,并利用大肠杆菌和霉菌对改性后的粉体进行了抑菌率测试。结果表明:载银二氧化钛粉体呈球状分布,单质Ag附载到了TiO2表面。在反应温度为30℃时,经添加质量分数为3%的硅烷偶联剂KH570进行改性后的载银纳米二氧化钛抗菌粉体全部分布于石蜡中或界面上,水相澄清,亲油性改性效果最好,且改性后粉体的抗菌性能基本不变。

In order to enhance the dispersion of silver doped nano-TiO2 antibacterial powder in Pro-oily polymer, silane coupling agent （KH570）, maleic anhydride, trioctyl phosphate and butyl p-hydroxybenzoate were used to modify the surface of silver doped nano-TiO2. By means of X-ray diffraction （XRD）, X-ray photoelectron spectrum （XPS） and scanning electronic microscope （SEM）, the morphology and composition of antibacterial powder were characterized, and the antibac- terial property of powder was tested with escherichia coli and fungi. The results indicate that： silver doped nano-TiO2 powder presents spherical distribution and elemental Ag attaches to the TiO2 surface. The silver doped nano-TiO2 powder modifyed by 3% silane coupling agent （KH570） at 30~C distributes in paraffin and the interface, which shows excellent Lipophilic property, and antibacterial property of the modified powder is basically unchanged.