Abstract
Colloidal calcium carbonate conventionally used as detergent in lubricant, i.e., overbased calcium sulfonate, was functionalized by the product of the reaction of calcium hydroxide and tetraphosphorus decasulfide with water to yield a mineral calcium thiophosphate, or with isopropanol to yield an organic calcium dialkyl dithiophosphate. These two species are respectively comicelized with the initial calcium carbonate colloidal core. The colloidal nature of these products was confirmed and they were evaluated in a four-ball test and compared to the original nonfunctionalized colloidal additive. Both modified products exhibit improved extreme-pressure performances, while their antiwear properties compared to those of the original overbased substrate remain at least at the same level.
Published Version
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