Abstract
Water-soluble cationic polymers were prepared by the amination of the epoxy groups in pely(glycidyl methacrylate) (PGMA) with poly(ethylene polyamine). ln order to see the cationic flocculation effect of these polymers the kaolin suspension was used. The flocculation effect was studied by observing the supernatant suspension concentration in jar test, the sedimentation rate and sedimentation volume by the use of test tube. The best flocculation effect was obtained when PGMA(M.W.>60x104)was treated with about 20mol polyethylenepolyamines (to epoxy groups) in acetene at 30-60C for 15-120 minutes. Diethylenetriamine, triethylenetetramine and tetraethylenepentamine gave similar effect. The suitable concentration range toward 500 mg/l kaolin suspension was 0.1-1.0ppm and the supernatant concentration at the optimum dosage after 2 minutes was below 40mg/l. The cationic polymers are most effective over the pH range of 2.5-8.5. The maximum rate of sedimentation was 5.8 cm/min, when the ameunt of the polymers was 0.010% of kaolin.
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