MODIFIED NANOMETER TITANIUM DIOXIDE COMPOSITE MATERIAL COATED WITH HALAMINE ANTIBACTERIAL AGENT AND PREPARATION METHOD THEREFOR

摘要

Provided is a modified nanometer titanium dioxide composite material coated with a halamine antibacterial agent. A preparation method therefor is: (1) dispersing nanometer titanium dioxide in an aqueous solution containing a dispersing agent, and ultrasonically dispersing same until uniform to obtain an A phase; (2) using a mixture of polymerization monomers, i.e. halamine antibacterial agent precursor allyl hydantoin and methyl methacrylate, as a B phase; (3) slowly adding the B phase dropwise into the A phase under stirring, ultrasonically dispersing same so as to prepare a uniformly dispersed miniemulsion, transferring same into a flask equipped with a reflux condensation and stirring device and adding an initiator in a dropwise manner so as to carry out a reaction; and (4) after the reaction is finished, performing washing, drying and chlorinating so as to prepare a finished product. In the present invention, the surface of the nanometer titanium dioxide is coated with a layer of halamine antibacterial agent precursor and methyl methacrylate polymerization monomers to form a nanometer composite particle having a core-shell structure, and a composite material capable of enabling a halamine antibacterial agent to be resistant to ultraviolet and also improving the antibacterial performance of the nanometer titanium dioxide in the absence of light is prepared, this being of great importance.