オレイルアミン処理雲母の潤滑油中への分散

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Dispersibility of the sericite, of which surface was pretreated to be hydrophobic with oleylamine acetate, in organic solvents and some luburicant oils was observed in order to make the stable sericite-suspended lubricant oils. The sericite sample is well dispersed in some solvents such as methyl isobutyl ketone (MIBK), toluene, ethyl acetate which have a weak polarity and the values of solubility parameter falling in some narrow range. Hence the dispersing degree of the sericite in the nhexane suspension is improved by the addition of a polar solvent, such as MIBK. The dispersibility of the sericite in the luburicant oils is increased in the order poly a -olefin oil<paraffimic mineral oil<dioctyl sebacate (DOS), corresponding to the increase in polarity of the Iuburicant oils, whereas the redispersing trend of the sediments falls in the same order. The stability of the sericite suspension of the mineral base oil is remarkably improved by the addition of DOS along with polyglyceryl oleate, such as hexaglyceryl pentaoleate and decaglyceryl decaoleate. It is estimated that DOS with rather high polarity improves the affinity between the sericite surface and the mineral oil, and polyglyceryl oleate adsobed on the surface acts to form a "loose" flocculated structure among the particles, resulting in the prevention of compact sediments. It is found also that the method using such additives is effective for making practically stable lubricant dispersion so as to adjust the affinity between the given solid surface and the mineral oil, or the balance of respective cohesive forces between particles and between dispersion medium.
日本粘土学会の論文
1991-11-20

オレイルアミン処理雲母の潤滑油中への分散

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