油添加剤の研究-3-ジアルキルジチオリン酸亜鉛塩混合物による酸化防止について

概要

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In order to improve the lean solubility of zinc dialkyl dithiophosphates having lower alkyl radical (isopropyl, <I>n</I>-butyl etc.) in liquid paraffin, binary or ternary mixture containing longer chain dialkyl dithiophosphates was studied. When the content of longer chain compound (e.g., 4-methyl-2-pentyl, cyclohexyl, 2-ethylhexyl) in the mixture containing 2 or 3 kinds of dialkyl dithiophosphates exceeds above 60%, the mixture of dialkyl dithiophosphates becomes soluble in liquid paraffin. Their antioxidant actions in the paraffin auto-xidation are similar to those obtained in the use of single component of the mixed system. The combination of dialkyl dithiophosphates and phenothi-azine or phenyl-α-naphthylamine exhibits high synergism. In order to improve lean mutual solubities of phenothiazine to the dialkyl dithiophosphate in liquid paraffin the addition of dilauryl phthalate or methyl naphthalene is effective for the improvement of solubilities as well as antioxidant action.
日本油化学会の論文