Preparation of The Natural modified Tannin Mannich flocculant named ZM-A and ZM-B.By mannich reaction, a sort of natural modified cationic flocculant (ZM series) is attained.

• 反应时间为4h。 用植物胶、乙醇胺和甲醛进行曼尼希反应,制得了ZM-B型絮凝剂,产品为棕红色液体,粘度为246cps左右。