Hydraulic fluid, hydraulic equipment containing this fluid and a concentrate of this fluid

• US 4,354,949 A
• Filed: 01/21/1981
• Issued: 10/19/1982
• Est. Priority Date: 01/24/1980
• Status: Expired due to Term

• Current Assignee: Shell Oil Company (Shell Plc)
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Eggers, Carl A., Galvin, Gerald D.
• Primary Examiner(s): ALBRECHT, DENNIS
• Application Number:
  US06/226,675
• Time in Patent Office: 636 Days
• Field of Search: 252/39, 252/49.5, 252/52 A, 252/73, 252/74, 252/75, 252/76, 252/77, 252/312, 424/170
• US Class Current: 508/223
• CPC Class Codes: C10M 173/00 Lubricating compositions containing more than 10% water
• CPC Class Codes: C10M 2201/02 Water
• CPC Class Codes: C10M 2201/062 Oxides; Hydroxides; Carbonates or bicarbonates
• CPC Class Codes: C10M 2201/105 Silica
• CPC Class Codes: C10M 2203/10 Petroleum or coal fractions, e.g. tars, solvents, bitumen
• CPC Class Codes: C10M 2203/102 Aliphatic fractions
• CPC Class Codes: C10M 2203/108 Residual fractions, e.g. bright stocks
• CPC Class Codes: C10M 2205/026 Butene
• CPC Class Codes: C10M 2207/022 containing at least two hydroxy groups
• CPC Class Codes: C10M 2207/121 having hydrocarbon chains of seven or less carbon atoms
• CPC Class Codes: C10M 2207/122 monocarboxylic
• CPC Class Codes: C10M 2207/123 polycarboxylic
• CPC Class Codes: C10M 2207/125 having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
• CPC Class Codes: C10M 2207/129 having hydrocarbon chains of thirty or more carbon atoms
• CPC Class Codes: C10M 2207/141 monocarboxylic
• CPC Class Codes: C10M 2207/22 Acids obtained from polymerised unsaturated acids
• CPC Class Codes: C10M 2207/288 containing free carboxyl groups
• CPC Class Codes: C10M 2207/289 containing free hydroxy groups
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2209/103 Polyethers, i.e. containing di- or higher polyoxyalkylene groups
• CPC Class Codes: C10M 2209/104 : of alkylene oxides containing two carbon atoms only
• CPC Class Codes: C10M 2209/105 : of alkylene oxides containing three carbon atoms only
• CPC Class Codes: C10M 2209/107 : of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
• CPC Class Codes: C10M 2209/12 : Polysaccharides, e.g. cellulose, biopolymers
• CPC Class Codes: C10M 2215/042 : containing hydroxy groups; Alkoxylated derivatives thereof
• CPC Class Codes: C10M 2215/22 : Heterocyclic nitrogen compounds
• CPC Class Codes: C10M 2215/221 : Six-membered rings containing nitrogen and carbon only
• CPC Class Codes: C10M 2215/225 : the rings containing both nitrogen and oxygen
• CPC Class Codes: C10M 2215/226 : Morpholines
• CPC Class Codes: C10M 2215/30 : Heterocyclic compounds
• CPC Class Codes: C10M 2217/024 : containing monomers having an unsaturated radical bound to an amido or imido group
• CPC Class Codes: C10M 2217/028 : containing monomers having an unsaturated radical bound to a nitrogen-containing hetero ring
• CPC Class Codes: C10M 2217/06 : Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
• CPC Class Codes: C10M 2219/02 : Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
• CPC Class Codes: C10M 2219/108 : Phenothiazine
• CPC Class Codes: C10N 2020/01 : Physico-chemical properties
• CPC Class Codes: C10N 2040/00 : Specified use or application for which the lubricating composition is intended
• CPC Class Codes: C10N 2040/02 : Bearings
• CPC Class Codes: C10N 2040/04 : Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• CPC Class Codes: C10N 2040/042 : for automatic transmissions
• CPC Class Codes: C10N 2040/044 : for manual transmissions
• CPC Class Codes: C10N 2040/046 : for traction drives
• CPC Class Codes: C10N 2040/08 : Hydraulic fluids, e.g. brake-fluids
• CPC Class Codes: C10N 2040/30 : Refrigerators lubricants or compressors lubricants
• CPC Class Codes: C10N 2040/32 : Wires, ropes or cables lubricants
• CPC Class Codes: C10N 2040/34 : Lubricating-sealants
• CPC Class Codes: C10N 2040/36 : Release agents or mold release agents
• CPC Class Codes: C10N 2040/38 : Conveyors or chain belts
• CPC Class Codes: C10N 2040/40 : Generators or electric motors in oil or gas winning field
• CPC Class Codes: C10N 2040/42 : Flashing oils or marking oils
• CPC Class Codes: C10N 2040/44 : Super vacuum or supercritical use
• CPC Class Codes: C10N 2040/50 : Medical uses
• CPC Class Codes: C10N 2050/01 : Emulsions, colloids, or micelles
• CPC Class Codes: C10N 2070/02 : Concentrating of additives

Abstract

Hydraulic fluids consisting of oil in water emulsion comprising 90-99%w of water, non-ionic emulsifier and 0.5-5%w of a high viscosity lubricating oil having a kinematic viscosity of 40° C. of at least 160 cS.

Claims

1. A hydraulic fluid which is an oil-in-water emulsion and comprises from 90-99% w of water, from 0.5-5% w of a lubricating oil with a kinematic viscosity at 40°

C. of at least 300 cS, and 10-80% w of the amount of oil of at least one non-ionic emulsifier.

2. A hydraulic fluid according to claim 1, in which the amount of water is from 94-99% w, and the amount of lubricating oil is from 0.5-4% w.

3. A hydraulic fluid according to claim 1 in which the lubricating oil comprises residual components of a vacuum distillation of a mineral oil.

4. A hydraulic fluid according to any one of the preceding claims in which the lubricating oil has a kinematic viscosity at 40°

C. of at least 400 cS.

5. A hydraulic fluid according to claim 1, in which said non-ionic emulsifier consists of a condensation product of one or more alkylene oxides with one or more compounds with a reactive hydrogen atom.

6. A hydraulic fluid according to claim 5, in which the alkylene oxides are ethylene oxide and/or propylene oxide, and the compounds with a reactive hydrogen atom are carboxylic acids.

7. A hydraulic fluid according to claim 6, in which the emulsifier contains one type of polymeric component which is derived from an oil-soluble complex mono-carboxylic acid (polymeric component A) and another type of polymeric component which is the residue of a water-soluble compound containing polyoxyalkylene chains (polymeric component B).

8. A hydraulic fluid according to claim 7, in which the polymeric component A has a molecular weight of at least 500 and consists of a poly-(12-hydroxystearic acid) chain terminated with stearic acid, and the polymeric component B has a molecular weight of at least 500 and is derived from ethylene oxide.

9. A hydraulic fluid according to claim 7, in which in the emulsifier each of the hydroxyl groups present in polymeric component B has been esterified with a molecule of polymeric component A.

10. A hydraulic fluid according to claim 1 which contains a non-ionic emulsifier with molecular weight below 1000.

11. A hydraulic fluid according to claim 1 which comprises at least one anti-pitting additive.

12. A hydraulic fluid according to claim 11 in which the anti-pitting additive is N-isopropyl ethanolamine.

13. A hydraulic fluid according to claim 11 in which the amount of the anti-pitting additive is from 0.1-30% w of the amount of lubricating oil present.

14. A hydraulic fluid according to claim 1 which comprises at least one anti-rust additive.

15. A hydraulic fluid according to claim 14 which comprises di-ethanolamine and/or tri-ethanolamine as an anti-rust additive.

16. A hydraulic fluid according to claim 14 which comprises an overbased calcium salt of an alkyl salicylic acid.

17. A hydraulic fluid according to claim 14, in which the total amount of anti-rust additives is from 0.5-10% w of the amount of lubricating oil present.

18. A hydraulic fluid according to claims 12 or 15 comprising an acid in up to stoichiometric quantities of alkanol amine present.

19. A hydraulic fluid according to claim 18, wherein the acid is an alkenyl succinic anhydride.

20. A hydraulic fluid according to claim 1 comprising a thickened water phase.

21. A concentrate of a hydraulic fluid which contains 0-90% w water, 91-9.0% w of a lubricating oil having kinematic viscosity at 40°

C. of at least 300 cS and 50-1.0% w of a non-ionic emulsifier.