| 主权项 |
1. A method of lubricating at least one of a wet-brake, a transmission, a hydraulic, a final drive, a power take-off system, and combinations thereof, of a tractor comprising supplying to the tractor a lubricating composition comprising: an oil of lubricating viscosity and a water emulsifying agent comprising a sulphur-free phosphorus-containing salt of either (i) a hydroxy-substituted di-ester of phosphoric acid, or (ii) a phosphorylated hydroxy-substituted di- or tri-ester of phosphoric acid, or a mixture of (i) and (ii),
wherein sulphur-free phosphorus-containing salt is represented by Formula (1a): wherein
A and A′ are independently H, or a hydrocarbyl group containing 1 to 30 carbon atoms, wherein at least one of A and A′ is a hydrocarbyl group;each R and R″ group are independently a hydrocarbyl group;each R′ is independently R, H, or a hydroxyalkyl group;Y is independently R′, or a group represented by RO(R′O)P(O)—CH(A′)CH(A)- (such as RO(R′O)P(O)—CH2CH(CH3)—);x′ ranges from 1 to 5;m and n are both positive non-zero integers, with the proviso that the sum of (m+n) is equal to 4;wherein the water emulsifying agent is added to the lubricant composition in an amount from 0.01 wt % to 0.25 wt % phosphorous. |
