Preparation, Characterization And Application Of Organic-inorganic Nanocomposite Antimicrobials

Layered compounds were exchanged with different organic cation compounds through an liquid ion-exchange method, to prepare organic-inorganic nanocomposite antimicrobials. And preparation, structure and performance of organic-inorganic nanocomposite antimicrobials were studied. Meanwhile, the preparation and performance of antimicrobial emulsion paint were studied.First, pillared montmorillonites nanocomposite antimicrobials were prepared by introducing different content of decyltributylphosphonium bromide into sodium montmorillonite through ion-exchange method, and the structures were studied by thermogravimetric analysis (TGA) methods, X-ray diffraction (XRD) technique and fourier transform infrared (FTIR) spectroscopy. Also the antimicrobial activity and water-resistance was studiesd. The results showed that nanocomposite antimicrobials contains C-H characteristic peaks, therefore, the existence of the quaternary alkylphosphonium salts in the montmorillonites is proved, and its thermal stability obviously improve, its lamellar spacing expand; QPS-MMT4 with 21.37 mass% of quaternary alkylphosphonium salts, displays excellent water resistance ability and long-acting antibacterial activity with the MIC against E. coli and S. aureus of 800 mg/L and 150 mg/L.Second, adopting the green processes, layeredα-Zirconium Phosphate (α-ZrP) has been prepared by cycle hydrothermal method, then,α-ZrP was exchanged with different species and usage of quaternary alkylammonium salts to get pillaredα-ZrP nanocomposite antimicrobials. The structure of resulting nanocomposite antimicrobials were characterized by the TGA, XRD, FTIR, SEM and TEM techniques, and the Zeta potential, Z-Average, antibacterial activities and water resistance ability were studied. The results show that with the content of quaternary alkylammonium salts insert intoα-ZrP increasing, the pillaredα-ZrP layer spacing was enlarged, the partical of nanocomposite antimicrobials was more reunited, zeta potential of nanocomposite antimicrobials was more positive charge, z-Average of nanocomposite antimicrobials was bigger. The nanocomposite antimicrobials displayed excellent thermal stability with thermal decomposition temperature higher than 230℃. TDTBA-ZrP1.0 with 22.4 mass% of quaternary alkylammonium salts, displays excellent water resistance ability and long-acting antibacterial activity with the MIC against E. coli and S. aureus of 140 mg/L and 50 mg/L, have the potential use in microbial pollution management.Finally, Antimicrobial emulsion was prepared by adding QPS-MMT4 and TDTBA-ZrP1.0 into emulsion paint and its property was investigated. The results show that the antibacterial emulsion paint have good antibacterial mouldproof performance and excellent water resistance ability when additive content of antibacterial agent is 1.5 mass%, and the main test items of the prepared antibacterial emulsion paint have achieved national standard or industry standard.