Certain citric esters and amides, and certain mixtures thereof, e.g., mixtures comprising citrate oligomers, exhibit excellent anti-wear activity in lubricants. Many of these compounds or mixtures of compounds also exhibit a high degree of anti-wear synergy in combination with zinc dihydrocarbyldithiophosphates. The compounds of the invention are thus valuable tools that can allow one to reduce the amounts of zinc, and phosphates, that are used in the lubricant without sacrificing anti-wear performance.
某些
柠檬酸酯和酰胺,以及它们的某些混合物,例如包含
柠檬酸低聚物的混合物,在润滑剂中表现出卓越的抗磨损活性。其中许多化合物或化合物混合物与二氢碳基
二硫代磷酸锌结合使用时,还能显示出高度的抗磨协同作用。因此,本发明的化合物是非常有价值的工具,可以在不影响抗磨损性能的前提下减少润滑油中
锌和
磷酸盐的用量。