<論文>ポリ[(2-ビニルピリジウム・プロミド-co-ビニルアルコール)-g-アクリルアミド]グラフト共重合体によるカオリン懸濁液の擬集

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Graft copolymers of Poly [(2-vinylpyridinium bromide-co-vinylalcohoD -gacrylamideJwere prepared by the reaction of acrylamide with Poly (2-vinylpryidiniumbromide-co-vinylalcohoD. The flocculating a bilities for 5% aqueouskaolin suspension were investigated in the relation to the structures by measuringthe sedimentation rate, the sedimentation volume and the turbidity.The results obtained are as follows. 1) For every graft copolymer, the optimumcopolymer concentration required to flocculate 5% kaolin suspensionwas 40-80ppm. 2) Suitable mole fraction of acrylamide (FA,,), and that ofquarternary ammonium salt group of 2-vinylpyrdine (FQ2VP) in copolymer requiredfor flocculating abilities was respectively 0.75, and 0.17. 3) Suitable pHvalues 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) Copolymerswere more effective for typical commercial flocculants such as SumiflocFC, PAS-A and Himoloc Neo 600