以平均粒径为22μm和0.5μm的α-Al_2O_3粉体为起始原料(以下分别简Al_2O_3(C)和Al_2O_3(F)),分别以聚乙烯亚胺(PEI)和聚甲基丙烯酸铵(APMA)为聚合物电解质,采用非均相凝固法将Al_2O_3(F)颗粒均匀地包覆在Al_2O_3(C)粉体表面.重点考察了聚合物电解质的吸附时间、Al_2O_3(C)/Al_2O_3(F)的质量比、两种分子量的PEI对包覆型氧化铝粉体制备的影响.当Al_2O_3(C)/Al_2O_3(F)的质量比为1:3,经过分子量约为60 000的PEI处理2 h的Al_2O_3(C)粉体表面均匀地包覆了Al_2O_3(F)颗粒(经APMA处理2 h).采用该包覆型粉体制备出片状多孔支撑体,其孔隙率为35.8%,平均孔径为2.9μm,纯水通量为20m~3/(m~2·h·MPa).
Coated alumina powders were prepared by using α-Al_2O_3 with average particle size of 22 μm and 0.5 μm as starting powders(hereafter mentioned as Al_2O_3 (C) and Al_2O_3(F) , respectively) through heterocoag-ulation process was investigated.Al_2O_3(F) particle was successfully coated on the surface of Al_2O_3 (C) by using ammonia polymethacrylate(APMA) and polyethylenimine(PEI) as polyelectrolyte dispersant, respectively.The effect of adsorption time of polyelectrolyte dispersant on the surface of alumina, the weight ratio of Al_2O_3 (C)/Al_2O_3(F) as well as the two PEI with different molecular weight on the result of coated powders was studied in detail.The optimal coating conditions was as follows: the weight ratio of Al_2O_3(C) to Al_2O_3(F) was 1 : 3,Al_2O_3(C) powder and Al_2O_3(F) powder was modified with PEI (MW = 60 000) and APMA for 2 h, respec-tively.Disk supports were prepared by using the coated alumina powders under the abovementioned optimal con-ditions and the property of such disk support was as follows, porosity: 35.8% , average pore size: 2.9 μm, pure water flux: 205 m~3/(m~2.h·MPa) .
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