Evaluation of high-temperature dispersancy of motor oils

Synthesis of oil-soluble multipurpose sulfonate additives based on low-molecular-weight alkylphenols

“…Toluene served as solvent; the reaction temperature was 40-45°C, and the reaction duration, 1 h. The functional properties of the resulting calcium hydroxymethylenebis(alkylphenol) sulfonates were determined with M-11 oil (concentration 5 wt%). The detergent properties were examined on a PZV setup according to GOST 5726-53, dispersant properties, at 250°C by the procedure described in [7], the anticorrosive properties, on a DK-NAMI instrument at 140°C for 25 h according to GOST 20502-75, and antioxygenic properties, on a DK-NAMI instrument for 30 hours at 200°C.…”