摘要： 【目的】实现简便且高效的 TiO₂改性，以提升 TiO₂抗菌涂料的力学性能和耐久性。【方法】不额外添加有机溶剂，直接在涂料制备过程中添加没食子酸丙酯，即可实现 TiO₂改性。采用红外光谱仪和 X射线光电子能谱仪研究没食子酸丙酯与 TiO₂作用机制，研究没食子酸丙酯添加量对所得 TiO₂抗菌涂料微观形貌、拉伸性能和抗菌性能的影响。【结果】TiO₂表面缺陷与没食子酸丙酯存在弱配位作用，改性后 TiO₂保留了部分可参与光催化反应的活性位点的同时显著提升了涂层的力学性能。没食子酸丙酯添加量较少时（1. 0%），可以改善 TiO₂颗粒在水相中的分散性，使固化过程中，环氧颗粒均匀分布，增强涂层拉伸性能，且对涂料抗菌性能影响较小（抗菌率仅减小 0. 84%）；没食子酸丙酯添加量较多时（2. 5%），可通过增强 TiO₂颗粒与环氧树脂的界面结合，抑制两相分离来提高其拉伸强度和断裂伸长率，但是也覆盖了 TiO₂表面活性位点，导致抗菌性能下降（抗菌率减小 4. 77%）。【结论】适量添加没食子酸丙酯较添加常规 TiO₂分散剂，可使涂层拉伸性能和抗菌性能更优，且能符合相关底漆应用要求。没食子酸丙酯配位改性策略兼具经济性与高效性，可为 TiO₂抗菌涂料的工业化生产提供技术参考。

关键词: 抗菌涂料, 界面作用, 配位改性, 没食子酸丙酯, 二氧化钛

Abstract: ［Objective］ To achieve simple and efficient modification of TiO₂ to improve the mechanical properties and durability of TiO₂ antibacterial coatings.［Methods］TiO₂ modification can be achieved by adding propyl gallate directly during the coating preparation without adding additionalorganic solvents. Infrared spectroscopy and X-ray photoelectron spectroscopy were used to study themechanism of the interaction between propyl gallate and TiO₂，and the effects of propyl gallate addition on the microscopic morphology，tensile properties and antibacterial properties of the obtained TiO2 antibacterial coatings were studied.［Results］ TiO₂ surface defects have a weak coordination interaction with propyl gallate. After modification，TiO₂ retains some active sites that can participate inphotocatalytic reactions while significantly improving the mechanical properties of the coating. Thereare two principles：when the addition of propyl gallate is less（1. 0%），the dispersion of TiO₂ particles in the aqueous phase can be improved，so that the epoxy particles can be evenly distributed during thecuring process and enhance the tensile properties of the coating，and have little impact on the antibacterial properties of the coating（the antibacterial rate is only reduced by 0. 84%）； When the addition of propyl gallate was more（2. 5%）， the tensile strength and elongation at break could beimproved by enhancing the interfacial binding between TiO₂ particles and epoxy resin and inhibiting the two-phase separation，but it also covered the active sites on TiO₂ surface，resulting in a decrease in antibacterial performance（4. 77% reduction in antibacterial rate）.［Conclusion］ Compared with conventional TiO₂ dispersants，the appropriate addition of propyl gallate can improve the tensile propertiesand antibacterial properties of the coatings，and can meet the application requirements of relevant primers.The coordination modification strategy of propyl gallate is both economical and efficient，and can provide a technical reference for the industrial production of TiO₂ antibacterial coatings. 

Key words: antibacterial coating；interfacial interaction；coordination modification；propyl gallate, titanium dioxide

中图分类号: 

• TQ637. 3