Phosphosulfuration of Colloidal Calcium Carbonate-Evaluation of Antiwear and Extreme-Pressure Properties

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 or...

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Bibliographic Details
Published inTribology transactions Vol. 41; no. 1; pp. 140 - 144
Main Authors Delfort, Bruno, Chivé, Agnès, Daoudal, Bertrand, Lacôme, Thierry
Format Journal Article
LanguageEnglish
Published Colchester Taylor & Francis Group 01.01.1998
Taylor & Francis
Taylor & Francis Inc
Subjects
Antiwear Additives
Applied sciences
Exact sciences and technology
Extreme-Pressure Additives
Friction, wear, lubrication
Machine components
Mechanical engineering. Machine design
Surface active agents
Antiwear additive
Colloidal suspension
Lubricant additive
Calcium carbonate
EP additive
Four ball machine
Detergents
Experimental study
Motor oil
Micellization
Tribology
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Summary: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.
ISSN:1040-2004
1547-397X
DOI:10.1080/10402009808983732