A microporous substrate, such as a polysulphone membrane having on its surface a semi-permeable membrane being the reaction product of a polyamine, a water soluble polymer of formula 1
wherein R is hydrogen or an hydrocarbongroup, x is 50 - 99.9%, and y is 100-x mol.% and n indicates the molecular weight and of a crosslinking agent containing a polyfunctional group having reacted with the amino groups of the polyamine and of the polymer. In the formula 1 preferably R is an alkylgroup of 1-5 carbon atoms, particularly methyl, and n is equivalent to a mol. weight of more than 10.000. The water soluble polymer is advantageously a mixture of a polymer of formula 1 wherein x and y are both 50 mol.% and a polymer of formula 2,
this last mentioned polymer being preferably obtained by hydrolysis of a compound of formula 1. The degree of hydrolysis is preferably 70 to 99,9%. The crosslinking agent is preferably a mixture of iso-phtaloylchloride and trimesoylchloride; the polyamine is preferably an azo alkane compound having terminal amino groups with a straight chain comprising 8 to 24 carbon atoms, particularly 1.10-diamino-4.7-diazadecane; 1.14-diamino-4.8.11-triazatetradecane and 1.18-diamino-4.8.11.15-tetraazooctadecane. The flux of the membrane is at least 40 11m2 .h and the salt retention at least 90%.
一种微孔基材,如聚砜膜,其表面有一层半透膜,该膜是一种
多胺、一种式 1 的
水溶性聚合物的反应产物
其中 R 为氢或烃基,x 为 50 - 99.9%,y 为 100-x mol.%,n 表示分子量,以及含有多官能团的
交联剂与
多胺和聚合物的
氨基发生反应。在式 1 中,R 最好是 1-5 个碳原子的烷基,特别是甲基,n 表示分子量大于 10.000。
水溶性聚合物最好是式 1 聚合物(其中 x 和 y 均为 50 摩尔%)和式 2 聚合物的混合物、
最后提到的聚合物最好是通过
水解式 1 的化合物获得。
水解度最好为 70%至 99.9%。
交联剂最好是异
酞酰
氯和三
甲酰氯的混合物;
多胺最好是具有末端
氨基的偶氮
烷烃化合物,其直链由 8 至 24 个碳原子组成,特别是 1.10-二
氨基-4.7-二氮杂
十烷、1.14-二
氨基-4.8.11-三氮杂
十四烷和 1.18-二
氨基-4.8.11.15-四氮杂
十八烷。膜的通量至少为 40 11m2 .h,盐分保留率至少为 90%。