METHOD OF DETERMINING SUPERALKALINE ADDITIVE FOR LUBRICATION OILS

FIELD : petrochemical processes.SUBSTANCE : additive is prepared by interaction of (i) sulfured alkali metal alkylphenolate with alkaline number below that of prepared additive; diluting oil; C12-C26-carboxylic acid functioning as modifier in presence of catalyst; C1-C4-carboxylic acid alkali-earth metal salt; C3-C4-alkylene glycol; and alcohol containing at least 8 carbon atoms; and boric acid-modified Mannich base prepared by condensation of alkylphenol with ammonia and formaldehyde taken at weight ratio to sulfured alkylphenolate equal to (0.005-0.5) : 1 with (ii) alkali-earth metal hydroxide added to reaction mixture at 130-190оС portionwise in the course of reaction after addition of each alkali-earth metal hydroxide portion.EFFECT : increased hydrolytic and colloidal stability of additive.1 tbl, 9 ex