A multistage process for preparing interfacially polymerized polyamide reverse osmosis membranes on a microporous support is disclosed. the process involves applying a solution containing from 1 to 10 wt % of an aromatic diamine having 1 or 2 aromatic rings and 2 to 3 amino groups in a first solvent to the microporous substrate. Then a solution of an aromatic or cyclophatic acyl chloride having 1 or 2 rings and 2.2 to 4 acyl chloride groups in a solvent immiscible with the first solvent is applied to the microporous substrate. Then a solution of different acyl chlorides is applied to the substrate. The acyl chlorides in this second solution can have 2 to 4 acyl chloride groups attached to an aliphatic group of 6 to 12 carbon atoms or an aromatic or cycloaliphatic group having 1 or 2 rings and containing 8 to 14 carbon atoms. Also suitable for the second treatment are bis chloroformates.
本发明公开了一种在微孔衬底上制备界面聚合聚酰胺反渗透膜的多级工艺。该工艺包括在微孔衬底上涂抹在第一溶剂中含有 1 至 10 wt % 具有 1 或 2 个芳香环和 2 至 3 个
氨基的芳香族二胺的溶液。然后将具有 1 或 2 个芳香环和 2.2 至 4 个酰基
氯基团的芳香族或环芳香族酰基
氯在与第一种溶剂不相溶的溶剂中的溶液涂在微孔基底上。然后将不同酰基
氯的溶液涂抹在基底上。第二种溶液中的酰基
氯可以有 2 至 4 个酰基
氯基团,连接在 6 至 12 个碳原子的脂肪族基团或具有 1 或 2 个环且含有 8 至 14 个碳原子的芳香族或环脂肪族基团上。适用于第二种处理方法的还有双
氯甲酸酯。