Na型フッ素四ケイ素雲母-水系の性質(1) : 水素イオン置換の分散性と科学的安定性への影響

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Effects of ion-exchange reaction of interlayer Na by hydogen ion in aqueous suspensions of sodium fluor-tetrasilicic mica(Na-TSM) on the dispersion state and chemical stability of it were studied. Na-TSM suspensions with appropriate solid concentration form stable dispersion, where a part of Na ions of Na-TSM diffuse into a bulk solution along with OH ion arised from Donnan hydrolysis and act as counter ion leading to the formation of thick electric double layer. With respect to pH condition, weak aggregation is formed in the suspensions adjusted at pH 9-5 and strong flocculation occurs in those with pH value below 4,while good dispersion is attained at pH 10〜12. Hydrogen(H) ion in the aqueous system is not only apt to adsorb in the double layer by displacing Na but.is also able to displace Mg in octahedral lattice. Such H-TSM suspensions that prepared by dialysis and ion-exchange treatment using H-resin are unstable, since the crystal structure is collapsed by H ion in the interlayer as the time proceeds. As thinner is the solid concentration, amount of H ion is increased per unit weight of Na-TSM, dispersion tends to be unstable by similar reasoning. On the other hand. H-TSM suspensions are changed to good dispersion by adding NaOH to a pH value over 10. Addition of sodium salts such as phosphate, sulfate and chloride also improves the dispersing state due to the action lowering H ion concentration in the double layer together with supplying Na. Sodium phosphate acts as a good dispersing agent increasing pH value by hydrolysis and removing Mg from the double layer by complex formation.
日本粘土学会の論文
1992-03-25

Na型フッ素四ケイ素雲母-水系の性質(1) : 水素イオン置換の分散性と科学的安定性への影響

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