【摘要】 采用共价健合方法将高分子季铵盐接枝在纳米SiO₂粉体表面,其抗细菌效果与无机载银抗菌剂相当,对金黄色葡萄球菌和大肠杆菌的最小抑菌浓度分别为100mg/L和1500mg/L.使用抗菌剂母粒化法将其添加到聚乙烯（PE）中制备抗菌塑料,抗菌粉体均匀分散在塑料的外层,平均粒径为200nm.抗菌塑料对细菌和霉菌的抗菌效果都非常显著,其防霉性能明显优于由无机载银抗菌剂制备的抗菌塑料.抗菌塑料人工老化处理不会使其抗菌效果明显下降,具有良好的抗菌长效性和稳定性.更多还原

【Abstract】 The macromolecular quaternary ammonium salts were attached covalently on the surface of nano-SiO₂ to make nanometer SiO₂ antimicrobial.The minimum inhibitory concentrations（MIC）of NSGMQAS against Gram-positive bacterium,Staphyococcus aureus（ATCC 6538）,and Gram-negative bacterium,Eschericha coil（ATCC 25922）are 100 mg/L and 1500mg/L,respectively.Antimicrobial polythene（PE）were prepared by adding 2% antimicrobial SiO₂ nanoparticles,the resultant plastics can kill more than 99% test microorganism on contact,and they also exhibit sustaining bactericidal activity after the artificial aging treatment.The antifungal activity of the PE containing antimicrobial SiO₂ nanoparticles is superior to the PE containing the same addition of inorganic antimicrobial attached Ag⁺. The average diameter Of antimicrobial SiO₂ nanoparticles is 200 nm,which dispersed equably in the outside of antimicrobial plastic.更多还原