| 摘要 |
A method of preparing magnesium alkylphenates comprising: 1. preparing a suspension of "active" magnesium oxide in methanol; 2. contacting said suspension with a mixture containing (a) an alkylphenol bearing one or more C6-C60 alkyl substituents; (b) a dilution oil; (c) and optionally a heavy alcohol of a boiling point of between 100 DEG and 200 DEG C., the ratio of number of mols of "active" magnesium oxide to number of recurrent phenolic OH units being between about 0.25 and 2; and 3. carbonating the resultant medium under pressure with carbon dioxide. The magnesium alkylphenates thus obtained are suitable detergent-dispersant additives for lubricating oils in amounts of between about 1 and 8 percent of the weight of the oils. |
