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外压式薄壁支撑体陶瓷膜具有渗透阻力小的优势,但在浸涂法制备膜层时,薄壁使毛细管力迅速消失,所形成的膜层厚度较小,易产生膜缺陷。为改善薄壁支撑体上堇青石微滤膜的制备,本文通过改变浆料固含量,在板式堇青石蜂窝支撑体上(壁厚1.03 mm)的薄壁型制备了平均孔径为0.62μm,最大孔仅为0.98μm的堇青石微滤膜。结果表明,堇青石湿膜厚度随着浆料固含量的增加而增加,毛细过滤机理对堇青石湿膜厚度的影响增加,但增加程度逐渐降低,粘性涂覆机理的贡献逐渐增加,当浆料固含量为30%时,能够获得无缺陷的膜层,膜层的厚度为20μm。这说明适度提高浆料的固含量和粘度有助于在薄壁支撑体获得良好膜层。
External pressure thin-walled ceramic membrane support has the advantage of small penetration resistance, but in the preparation of the film by dip coating method, the thin-walled capillary force disappear rapidly, the resulting film thickness is small, prone to membrane defects. In order to improve the preparation of cordierite microfiltration membrane on thin-walled support, the average pore size was 0.62μm with the average pore size of 0.62μm on the plate-type cordierite honeycomb support (wall thickness 1.03 mm) by changing the solid content of the slurry. The maximum A cordierite microfiltration membrane with pores of only 0.98 μm. The results show that the wet film thickness of cordierite increases with the increase of solid content of the slurry, and the effect of capillary filtration mechanism on the wet film thickness of cordierite increases, but the degree of increase decreases gradually and the contribution of viscous coating mechanism increases. When the solid content is 30%, a defect-free film layer can be obtained, and the thickness of the film layer is 20 μm. This shows that moderately increasing the solids content and viscosity of the paste helps to obtain a good film on the thin-walled support.