摘要：本文以钛酸丁酯为原料，用溶剂凝胶法制备纳米TiO2，利用SEM观察粉体表面形貌和结构.分别用硅烷偶联剂(KH550, KH570, A171)对纳米粉体进行表面改性，利用SEM、XRD和FTIR，考察改性粉体的表面结构和性质变化.同时测定经改性后粉体的亲油化度值和在水、甲苯和石油醚中的分散情况；采用甲苯作溶剂，将改性粉体与LDPE树脂混合，经流延得到抗菌聚乙烯复合薄膜.利用SEM和数码相机，观察改性纳米TiO2抗菌剂/LDPE复合薄膜的抗菌性能.结果表明，KH570改性粉体在甲苯中的分散性最好，当抗菌粉体的添加量为3.0%时，制得复合薄膜的抗菌性能最好，抗菌率达到99.99%，即具有最好的抗菌效果.
Abstract:In this paper, based on Tetra-n-butyl Titanate as raw material, nanometer TiO2 was prepared by solvent gel (Sol-Gel) method. Modified powder surface morphology and structure was inspected by SEM. Nanometer powder surface was modified with silane coupling agent (KH550, KH570 and A171, respectively). The surface structure and qualitative change of modified powder were observed by SEM, XRD and FTIR. Besides the oil-wet change degree value and dispersing situation in water, toluene and petroleum were detected. Using toluene as solvent, the modified powder and LDPE resin were mixed and then achieved antibacterial polyethylene composite film membrane through the way of flow delay. The modified nano TiO2 antibacterial agent/LDPE compound film antibacterial performance was measured with SEM and digital camera. The results showed that the best dispersion in toluene was KH570 modified powder. When 3% antibacterial powder added, the antibacterial properties of composite film were best. Its antibacterial rate reached 99.9%, which had the best antibacterial effect.