Alkylphosphorofluoridothioates having low wear volume and methods for synthesizing and using same

摘要

Alkylphosphorofluoridothioates containing alkyl groups of greater than four carbons which exhibit significantly lower wear volume compared to ZDDP, methods of making same with high yields, and methods of using same as lubricant additives.

主权项

1. A method for synthesizing an alkylphosphorofluoridothioate having desired alkyl groups, comprising the steps:
i) reacting phosphorus pentasulfide with alcohol having the desired alkyl groups to form an O,O-dialkyl dithiophosphoric acid; and ii) reacting the O,O-dialkyl dithiophosphoric acid with thionyl fluoride (SOF2)so that one of the thio groups is replaced by a fluoride to yield the alkylphosphorofluoridothioate.