二氧化钛表面改性及其涂布膜光催化性能的研究

采用硅烷偶联剂和钛酸酯偶联剂对二氧化钛进行表面改性,利用粒径和Zeta电位等表征得出最佳改性条件.结果表明,钛酸酯偶联剂对粉体表面改性效果更优.将偶联后的粉体分散在聚乙烯醇中,用涂布的方式将其涂覆在双向拉伸聚丙烯薄膜上,制备了有良好光催化性能的二氧化钛涂布膜.采用微型光泽仪、摩擦系数测定仪、雾度仪等分析了薄膜各项物理性能,当粉体加入量为1;时,涂布膜具有最优的机械性能.通过抗菌和光降解实验分析了涂布膜的光催化性能,当粉体加入量为2;时,薄膜抗菌效果达到最佳的99.2;,并对有机染料降解效果提高近70倍.

Surface Modification of Titanium Dioxide and Photocatalytic Activity of Its Coating Film

Titanium dioxide was modified by coupling agents and characterized with grain size, zeta potential, etc, in order to obtain the optimum systhesis conditions.The results show that titanate coupling agent could successfully modify titanate powder, which increases the dispersion effect of the powder in polyvinyl alcohol.The coupled powders were dispersed in polyvinyl alcohol, and then coated on the BOPP film substrates, thus achieving the titanium dioxide coating films with photocatalytic properties.The above coating films were analyzed by micro gloss tester, friction coefficient tester, and fog degree instrument.The film shows good mechanical properties, dispersion effect with 1% of the modified powder.In the bactericidal effect was examined the film with 2% TiO2 can achive the best antibacterial effect of 99.2% and in the photodegradation experiment, the degradation rate increased nearly 70 times.