通过涂敷交联法制备了一种新型荷正电纳滤膜，其中以三甲基壳聚糖酰氯（TMC）为膜材料配制铸膜液，以聚砜超滤膜为基膜，环氧氯丙烷为交联剂。试验在全面考察该复合纳滤膜制备工艺基础上，重点探讨了交联时间对复合纳滤膜的性能影响。结果显示：该方法极大的缩短了交联时间，最优交联时间仅为2h；同时最优条件所制备纳滤膜的纯水透过系数为14.09 L•h-1•m-2•MPa-1，表面粗糙度约为4nm；对无机盐的截留性能符合截以下规律：MgCl2>NaCl>MgSO4>Na2SO4，满足荷正电纳滤膜的Donnan平衡模型。

 A series of novel positively charged nanofiltration membrane having a polysulfone (PS) UF membrane as the substrate were prepared by coating the aqueous solution of trimethyl chitosan chloride (TMC), subsequently crosslinking with epichlorohydrin(ECH). Besides a comprehensive study on preparation of the NF membrane, the effect of cross-linking time on the performance of composite NF membrane was focused specially. The results suggest that the optimal cross-linking time is only 2h, which is greatly shortened when compared with other existing research; The pure water permeability of NF membrane is 14.09 L•h-1 •m-2 •MPa-1, and surface roughness is about 4nm；The rejection of this membrane to the electrolyte solutions decreases in the order of MgCl2,NaCl,MgSO4 andNa2SO4, meeting the Donnan equilibrium mode of the positively charged NF membrane.

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