以钛酸四异丙酯为原料,采用溶胶-凝胶法制备TiO2粒子溶胶,以孔径100 nm 的管式 Al2 O3微滤膜为支撑体制备超滤膜,研究了涂膜溶胶中添加剂比例、涂膜次数和涂膜时间对超滤膜完整性的影响。结果表明,调整添加剂比例、涂膜次数和涂膜时间可以消除超滤膜的缺陷；添加剂比例对 TiO2超滤膜的物相没有影响。溶胶中添加剂比例m(TiO2)∶m(PVA)∶m(HPC)＝8∶2∶2,涂膜两次,每次涂膜时间为10~15 s时,可以获得无裂纹、无针孔的超滤膜,TiO2超滤层厚度约1μm,孔径分布于3~8 nm 之间,孔隙率42％。
TiO2 colloidal sol was prepared by sol-gel method with titanium tetra-isopropoxide as raw material. TiO2 ultrafiltration membranes were prepared using Al2 O3 microfiltration membrane of 100 nm pore size as support.Effects of additive contents in dipping sols,coating times and coating time on the integrity of TiO2 ul-trafiltration membranes were investigated.It is indicated that defects in TiO2 ultrafiltration membranes can be deliminated by adj usting additive contents,coating times and coating time.Additive content in sol has no effects on the phase of TiO2 ultrafiltration membranes.TiO2 ultrafiltration membranes without cracks and pinholes can be obtained from TiO2 sol with a mass ratiom(TiO2)∶m(PVA)∶m(HPC)of 8∶2∶2 by coating for 10-15 s twice.TiO2 layer thickness is about 1μm,the pore size distributes in the range of 3-8 nm,and the porosity is 42%.
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