To obtain ultrabasic sulfonate colloidal products useful as additives for lubricants by reacting alkyl- or alkylarylsufonate with phosphorus sulfide and calcium (hydr)oxide and water.
Alkyl- or alkylarylsulfonates used have a basicity of 50 to 500 (a mg number of KOH per 1 g of material). Phosphorus sulfide used is tetraphosphorus decasulfide. The mole ratio of calcium oxide or calcium hydroxide to phosphorus sulfide is 2/1 to 20/1. Solvents used are hydrocarbons (e.g. xylene). A practical example: 50 g of ultrabasic calcium sulfonate, 30 g of 130 neutral and 50 ml of tetrahydrofuran are introduced in 250 ml of xylene, and then 10 g of tetraphosphorus decasulfide and 20 g of calcium oxide are dispersed. While stirring at 30°C, 8.1 g of water in 50 ml of tetrahydrofuran is added over one hour. Additionally, after mixing the medium for 3 hours, tetrahydrofuran and excess water are removed by distillation.
BERUTORAN DAUDARU
CHIERII RAKOMU
FURANSOWAAZU DEIMIE
MOORISU BORUN
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