Preparation of antibacterial agent PHMG-KH560@TiO2 and its application in paint
[Introduction]The growth and multiplication of bacteria cause coatings to mold and reduce their protective performance on substrates.To improve the antibacterial properties of coatings,antibacterial agents are usually added to coatings.[Method]γ-Glycidylethoxypropyltrimethoxysiane(KH560)was used as a coupling agent to modify the surface of titania(TiO2)nanoparticles,and then grafted with polyhexamethyleneguanidine hydrochloride(PHMG),forming an organic-inorganic composite antibacterial agent PHMG-KH560@TiO2.[Result]The structure and morphology of TiO2 nanoparticles before and after modification were characterized by Fourier-transfer infrared(FT-IR),X-ray photoelectron spectroscopy(XPS),and transmission electron microscopy(TEM).It was found that TiO2 was successfully modified.The results of Zeta potential measurement and storage stability test showed that the dispersibility and stability of the modified TiO2 were improved.The antibacterial properties of TiO2 and PHMG-KH560@TiO2 and the waterborne acrylic coatings containing TiO2 and PHMG-KH560@TiO2 were tested by plate count method.The results showed that the antibacterial rate of modified TiO2 nanoparticles was more than 2 times that of unmodified TiO2.Compared with the unmodified TiO2 coating,the antibacterial rate of PHMG-KH560@TiO2-containing coating was more than 20 times higher.[Conclusion]The antimicrobial agent PHMG-KH560@TiO2 performs well in waterborne paint applications.
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