| 摘要 |
FIELD: lubricating oil additives. SUBSTANCE: method includes neutralizing alkylsalicylic acids with alkali- earth metal hydroxide in presence of mineral oil and hydrocarbon solvent, treating neutralization product to remove solid particles, and treating it with carbon dioxide and alkali-earth metal hydroxide in presence of hydrocarbon solvent and promoter at 65-80 C with 0.5- 35% water based on alkali-earth metal alkylsalicylate weight. Solvent and promoter are then stripped and resulting additive is set free from solid particles. In order to provide higher yield of additive and reduce its viscosity, neutralization product, prior to be treated to remove solid particles, is treated at 70-90 C with alkylsalicylic acids taken in quantity 5-30% based on reaction mixture weight. EFFECT: accelerated process with no loss in additive quality. |
