陰イオン界面活性剤による絹雲母の表面処理と鉱油中への分散

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A stable lubricant system of sericite and paraffinic mineral oil was made with success by means of con-trolling the affinity between the solid surface and the mineral oil. The process is composed mainly of two stages, i.e. lipophylic treatment of the sericite surface with anionic surfactant and dispersion of the treated sericite into the mineral oil incorporated with a small amount of polyglyceryl oleate. The appropriate amount of anionic surfactant corresponding to the saturated monolayer adsorption onto the sericite surface was added in the aqueous sericite suspension, where the pH was adjusted at 7 to 8 and a sufficient amount of calcium chloride was mixed previously. The sericite pretreated with sodium lauryl sulfate was highly dispersed in the mineral oil in presence of hexaglyceryl pentaoleate. However, the dispersion found the formation of compact sediments resulting from free sedimentation of particles. On the other hand, the sericite pretreated with di(2-ethyl hexyl) sulfosuccinate of which adsorbed layer has a relatively larger polarity than that of lauryl sulfate layer produced markedly stable dispersion when decaglycerylhepta oleate was added due to the formation of a "loose" flocculated structure among the particles, resulting in the prevention of compact sediments. Such a stable sericite dispersion is expected to be applied in the lubricant system required for high durability under conditions such as at a higher temperature, since the surfactants used in the system have the higher heat-resisting property in comparison with that of the conventinal cationic surfactants.
日本粘土学会の論文
1991-11-20

陰イオン界面活性剤による絹雲母の表面処理と鉱油中への分散

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