| High-alkaline detergent is applied widely in lubricant additives. It is quiet different in water separation and washing resistance among productions from different companies or batches even in the same company, which has a great impact on lubricant performance.For guiding the production, synthesis and use of the product, this paper analyses the differences in compositions and structures of three typical sulfurized calcium alkyl phenolates which are used as detergents in lubricate base oil. In addition, the effect factors of water separation and washing resistance from different compositions is also studied. The effective components are extracted by rubber membrane dialysis. The differences in the structures and compositions of three detergents have been compared on the basis of elemental analyses, infrared spectroscopy (IR), and nuclear magnetic resonance (NMR), etc.The results show that the detergent with excellent performance, S206â… has the greatest advantage of effective content among these three detergents. Besides, its average molecular weight is the largest and its dispersion degree is the smallest. From the composition, S206â… contains the least free alkylphenol remained in the synthesis, S206â…¡a little more, S206â…¢the most. In addition, several compositions such as stearic acid can be found in S206. And S206â…¡, performance inferior sample in S206, contains most impurities such as amine compounds. From the structure, all the samples are para-sulfurized alkyl phenolate. But the long alkyl branching degree in S206â… is the greatest, then S206â…¡, the smallest is in S206â…¢. The study also finds that stearic acid remained in samples can lead to poor water-dividing performance and increasing the emulsification layer. Meanwhile, amine compound will decrease additive's stability in water although it can enhance additive's total based number.
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