Aqueous composition for lubricating motorization systems
The present invention relates to an aqueous lubricant composition for the lubrication of a stationary or mobile drive system, comprising at least: deionized water; at least one polyalkylene glycol; at least one antifreeze compound chosen from glycols, and at least one phosphorus compound. It also relates to the use of this aqueous lubricant composition for the lubrication and cooling of a stationary or mobile drive system.
1. A method of lubricating a drive system comprising a propulsion system of an electric or hybrid vehicle, comprising lubricating at least one part of the drive system using an aqueous lubricant composition comprising:
deionized water;
at least one polyalkylene glycol;
at least one antifreeze compound chosen from glycols, glycerol, diglycerol, triglycerol, or mixtures of two or more thereof; and
at least one phosphorus compound.
2. A method of lubricating and cooling a drive system, the method comprising lubricating and cooling at least one part of the drive system comprising a propulsion system of an electric or hybrid vehicle, using an aqueous lubricant composition comprising:
deionized water;
at least one polyalkylene glycol;
at least one antifreeze compound chosen from glycols, glycerol, diglycerol, triglycerol, or mixtures of two or more thereof; and
at least one phosphorus compound.
3. The method of claim 1 or claim 2 , wherein the total amount of water in the aqueous lubricant composition is at least 35% by weight, relative to the total weight of the composition.
4. The method of claim 1 or claim 2 , wherein the at least one polyalkylene glycol in the aqueous lubricant composition comprises at least 50% by weight of propylene oxide and/or ethylene oxide units.
5. The method of claim 1 or claim 2 , wherein the at least one polyalkylene glycol in the aqueous lubricant composition has a kinematic viscosity ranging from 100 mm 2 /s to 5000 mm 2 /s, measured at 100° C. (KV100) according to the ASTM D445 standard.
6. The method of claim 1 or claim 2 , wherein the total amount of polyalkylene glycols in the aqueous lubricant composition is at least 5% by weight, relative to the total weight of the composition.
7. The method of claim 1 or claim 2 , wherein the total amount of polyalkylene glycols in the aqueous lubricant composition ranges from 10% to 40% by weight, relative to the total weight of the composition.
8. The method of claim 1 or claim 2 , wherein the antifreeze compound in the aqueous lubricant composition is chosen from monoethylene glycol, diethylene glycol, propylene glycol, glycerol, or mixtures thereof.
9. The method of claim 1 or claim 2 , wherein the total amount of antifreeze compounds in the aqueous lubricant composition is at least 5% by weight, relative to the total weight of the composition.
10. The method of claim 1 or claim 2 , wherein the total amount of antifreeze compounds in the aqueous lubricant composition ranges from 15% to 30% by weight, relative to the total weight of the composition.
11. The method of claim 1 or claim 2 , wherein the phosphorus compound in the aqueous lubricant composition is chosen from salts of phosphate esters.
12. The method of claim 1 or claim 2 , wherein the total amount of phosphorous compounds in the aqueous lubricant composition is less than 5% by weight, relative to the total weight of the composition.
13. The method of claim 1 or claim 2 , wherein the total amount of phosphorus compounds in the aqueous lubricant composition ranges from 0.5% to 3% by weight, relative to the total weight of the composition.
14. The method of claim 1 or claim 2 , wherein the aqueous lubricant composition further comprises at least one additive chosen from antifoam agents, biocides, pH regulators, corrosion inhibitors, anti-wear and/or extreme-pressure additives, sequesterants, metal passivators, dyes, dispersants, emulsifiers, or mixtures thereof.
15. The method of claim 1 or claim 2 , wherein the aqueous lubricant composition further comprises an extreme-pressure additive chosen from sulfur-containing fatty acids, dimercaptothiadiazoles, or mixtures thereof.
16. The method of claim 1 or claim 2 , wherein the aqueous lubricant composition comprises less than 5% by weight of water-insoluble oils, relative to the total weight of the composition.
17. A method of lubricating a hydrogen drive system or an aqueous ammonia drive system, comprising lubricating at least one part of the drive system using an aqueous lubricant composition comprising:
deionized water;
at least one polyalkylene glycol;
at least one antifreeze compound chosen from glycols, glycerol, diglycerol, triglycerol, or mixtures of two or more thereof; and
at least one phosphorus compound.
18. A method of lubricating and cooling a hydrogen drive system or an aqueous ammonia drive system, the method comprising lubricating and cooling at least one part of the drive system, using an aqueous lubricant composition comprising:
deionized water;
at least one polyalkylene glycol;
at least one antifreeze compound chosen from glycols, glycerol, diglycerol, triglycerol, or mixtures of two or more thereof; and
at least one phosphorus compound.