改性纳米TiO_2/LDPE复合膜的制备及其抗菌性能

Preparation and Antibacterial Performance of Modified Nano TiO_2/LDPE Composite Membrane

以钛酸丁酯为原料,用溶胶-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和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.同时测定改性粉体的亲油化度和在水、甲苯和石油醚中的分散情况;采用甲苯作溶剂,将改性粉体与低密度聚乙烯(LDPE)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.

Based on tetra-n-butyl titanate as raw material,nanometer TiO2 was prepared by the solvent gel（ SolGel） method. Modified powder surface morphology and structure were inspected by SEM. Nanometer powder surface was modified with silane coupling agent（ KH550,KH570 or A171）. The surface structure and qualitative change of modified powder were observed by SEM,XRD and FTIR. Besides the oil-wet change degree and dispersing situation in water,toluene and petroleum were detected. Using toluene as solvent,the modified powder and Low Density Polyethylene（ LDPE） resin were mixed and then achieved antibacterial polyethylene composite film membrane through the way of flow delay. The antibacterial performance of modified nano TiO2 antibacterial agent /LDPE compound film was measured with SEM and digital camera. The results showed that the best dispersion in toluene was KH570 modified powder. When 3% antibacterial powder was added,the antibacterial properties of composite film were the best and its antibacterial rate reached 99. 9%.