EO付加オレイルアミンによる絹雲母 : アルコール懸濁液の分散

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Effects of a nonionic surfactant (oleyl amine with ethylene oxide) on the stability of the ethanolic suspension of sericite were investigated. The results obtained by the observation of the suspensions with a series of the surfactants differing molar proportions of ethylene oxide (n=2,5 and 10) are as follows. The surfactants having the property to be charged positively by accepting protons from neighboring substances are adsorbed onto the negatively charged surface of the sericite from the alcoholic solution by electrostatic interaction. The monolayer of the adsorbate surfactant is formed on the sericite surface, and the suspensions undergo deflocculation at much the same molar concentration of these three surfactants. The sediment volume of the particles formed reduces owing to the improvement of dispersibility of the suspension, as molar proportion of ethylene oxide among the three surfactants increases. The adsorbed layer of the surfactant on the solid surface has the two functional groups. Ethylene oxide chains are forced to orient towards the alcoholic phase, and oleyl groups act expelling alcohol molecules away from the ethylene oxide chains. Thus, the suspensions with these surfactants have a tendency to be weakly flocculated because of decreased solvation, forming the sediments easily redispersible. Compared with the stable suspension by the steric stabilizing mechanism with a polymeric dispersant that forms the strong caking of the settled particles, the suspensions with the ethoxylated surfactants are considered to be effective in the cases of practical applications that the suspension is required to prevent strong caking during standing.
日本粘土学会の論文
1989-08-25

EO付加オレイルアミンによる絹雲母 : アルコール懸濁液の分散

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