Al_2O_3/PTFE缠结多孔材料的制备及其渗透性能

Preparation of Al_2O_3/PTFE porous material and Its permeability

以Al2O3微粉和PTFE分散液为原料，经共混微粒间的挤压拉伸和低温烧结定型，得到了孔隙率45％左右的Al2O3／PTFE多孔材料。SEM结果显示该材料的微观形貌具有三维网状的缠结结构特征，在PTFE添加量10％时，制备得到的PTFE／Al2O3多孔材料的接触角为107°,具有较强的疏水性。在实验条件下，材料的孔隙率和透气率随PTFE添加量的增加而降低，而烧结温度（290～340℃）和烧结时间（5～30min）对材料的孔隙率和透气率影响不大。材料的纯水通量则随订FE添加量的增加迅速衰减至100L／m2·h以下，而透气率可维持在0．07m3·cm／m2·h·mmHg以上。

Al2O3-PTFE porous material have been prepared by low-temperature sintering after the blend of Al2O3 powder and PTFE dispersion. The porosity of the material was about 45 %. The SEM results showed that the Al2O3 powder have been enlaced by the fiber of PTFE with three-dimensional structure. The contact angle of the material（PTFE 10% ） was 107°. Under the experimental conditions, the porosity and permeability of the material was decreased with increasing PTFE concentration. Sintering temperature（290-340℃） and sintering time（5-30min） had little effect on the porosity and permeability of the material. The pure water flux was decreased rapidly to 100L/m2 .h with addition PTFE, while the air flux can be maintained at 0. 07m3 . cm/m2 . h .mmHg.