Flocculation of Kaolin Suspension with Graft Copolymers of Poly((2-Vinylpyridinium Bromide-co-Vinylalcohol)-g-Acrylamide).

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Graft copolymers of Poly [(2-vinylpyridiniu bromide-co-vinylalcohol)-gacrylamide] were prepared by the reaction of acrylamide with Poly (2-vinylpryidinium bromide-co-vinylalcohol). The flocculating abilities for 5% aqueous kaolin suspension were investigated in the relation to the structures by measuring the sedimentation rate, the sedimentation volume and the turbidity. The results obtained are as follows. 1) For every graft copolymer, the optimum copolymer concentration required to flocculate 5% kaolin suspension was 40-80ppm. 2) Suitable mole fraction of acrylamide (FAM), and that of quarternary ammonium salt group of 2-vinylpyrdine (FQ2VP) in copolymer required for flocculating abilities was respectively 0.75, and 0.17. 3) Suitable pH values for the floccculating action were in the broad range of about 2 or below-12 or above. 4) While an isoelectric point was found in the vicinity of pH 4.6, optimum flocculating ability was observed in the pH range of 6-10. 5) Copolymers were more effective for typical commercial flocculants such as Sumifloc FC, PAS-A and Himoloc Neo 600
日本素材物性学会の論文