| Color plate as a novel material has been applied in the fields of architectures, vehicles and appliances and so on.In the mean time, it is effective to broaden the applications of color plate by the fabrication of antibacterial color plate with antibacterial agents.Obviously, the most important component is the antibacterial agents including the natural antibacterial agents, organic antibacterial agents and inorganic antibacterial agents.Resently, Ag-doped TiO2, one of the inorganic antibacterial agents,has received much attention owing to its excellent antibacterial performance, persistence, heat resistance, and high security. In this research, coating method, comprising adding the silver-loaded titanium dioxide nanoparticles into the lacquer and coating it onto the color plate, was used to prepare antibacterial color plate.However, Ag-doped TiO2 is difficult to disperse in organic solvent, causing the formation of rough particles on color plate surface. To obtain the fine dispersity, the modifications of Ag-doped TiO2 by dry and wet method were conducted.Stearic acid and Stearyl amine were used to modify the Ag-doped TiO2 by dry and wet method, respectively. The effects of modifier dosage, modification time, temperature and pH on the modification were investigated for wet method as well as consideration of modifier dosage for dry method. Moreover, the optimum factors, such as the stirring speed and time, for the preparation of the antibacterial color plate and the stability of the antibacterial powder-modified Ag-doped TiO2 in the coil coating were also investigated. Fourier transformation infrared (FTIR) spectroscopy and scanning electron microscopy(SEM) were employed to characterize the modified antibacterial powders, and photocatalytic effect and antibacterium rate of the modified powder were also examined.For dry modification, with 2% of steric acid dosage, the lipophilicity of modified powder reached 46.4% and the setting ratio in the diluen was 1.95 mL/g. Under UV light irradiation for 50 min, the degradation efficiency of the methyl orange by the modified powder was 93% and the antibacterium rate reached up to 99%. The modefied powder had a good performance of slowly releasing silver ions, and the concentration of silver ions is 0.9 mg/L within 6 h.Moreover, the optimum condition for the preparation of the color plate was the dosage of antibacterial agents of 2%, the stirring speed of 3000 r/min, and grinding time of 3 h.The antibacterial coil coating materials remain relative stable and can be stored for at least 19 months.For wet modification, the optimum condition of the modification was dosage of stearyl amine of 4%, modification time of 2 h, pH of 3 and temperature of 70℃.The liquilicity of the powder modified was 56% and the setting ratio was 1.3 mL/g.Under the irradiation of UV light for 50 min, the degradation efficiency of methyl orange by the modified powders with wet method reached 91% and the antibacterium rate was more than 99%.The slow release of silver ions is perfect as the release concentration of silver ions was 0.4 mg/L within 6 h.The optimum parameters for the fabrication of color plate were adding amount of the antibacterial agents of 2%,stirring speed of 2000 r/min, and rubbing time of 2 h.The antibacterial coil coating can be stored for 24 months due to its good stability.The pilot scale experiment of the fabrication of antibacterial color plate was carried out. It was shown that the physical characteristics of the Ag-doped TiO2 antibacterial color plate can meet the requirment of having high resistance to boiling water, dry heat, acid and alkali by adding coating additive plasticizer of 2% and resin of 0.3%.The antibacterial ratio of the color plate is 99.99%. The photocatalytic degradation efficiency of methyl orange was 88% using antibacterial color plate with UV irradiation for 6 h.The total investment dynamic payback period of antibacterial color plate is 3 years based on the analysis of the profitability of antibacterial color plate. |
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