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CN-122029261-A - Lubricating composition for automotive transmissions

CN122029261ACN 122029261 ACN122029261 ACN 122029261ACN-122029261-A

Abstract

The present invention relates to an additive package comprising-at least one phosphite compound of formula (1), and-at least one thiadiazole compound corresponding to one of formulae (2), (3), (4) or (5) [ formula 1] [ Chemical formula 2] [ Chemical formula 3] [ Chemical formula 4] [ Chemical formula 5] Wherein R and R 1 independently of one another represent a hydrogen atom or a straight-chain or branched, saturated or unsaturated hydrocarbon radical comprising from 1 to 24 carbon atoms, optionally comprising one or more heteroatoms, R 2 and R 3 independently of one another represent a hydrogen atom or a straight-chain or branched, saturated or unsaturated hydrocarbon radical comprising from 1 to 24 carbon atoms, optionally comprising one or more heteroatoms.

Inventors

  • S. Tefnay
  • H. Elbach
  • BOUVIER GUY

Assignees

  • 道达尔能源一技术公司

Dates

Publication Date
20260512
Application Date
20241017
Priority Date
20231018

Claims (15)

  1. 1. An additive package, the additive package comprising: At least one phosphite compound of the formula (1), and At least one thiadiazole compound corresponding to one of the formulae (2), (3), (4) or (5), [ Chemical formula 1] [ Chemical formula 2] [ Chemical formula 3] [ Chemical formula 4] [ Chemical formula 5] Wherein: R and R 1 independently of one another represent a hydrogen atom or a straight-chain or branched, saturated or unsaturated hydrocarbon radical comprising 1 to 24 carbon atoms, said hydrocarbon radical optionally comprising one or more heteroatoms, R 2 and R 3 independently of one another represent a hydrogen atom or a straight-chain or branched, saturated or unsaturated hydrocarbon radical comprising 1 to 24 carbon atoms, said hydrocarbon radical optionally comprising one or more heteroatoms.
  2. 2. The additive package of claim 1, wherein the mass ratio between the phosphite compound of formula (1) and the thiadiazole compound ranges from 1/10 to 10/1, preferably from 1/5 to 5/1, more preferably from 1/2 to 2/1.
  3. 3. The additive package of claim 1 or 2, further comprising: At least one borated dispersant, and At least one compound selected from the group consisting of (i) phosphorothioate compounds, (ii) phosphate compounds corresponding to formula (7), and (iii) mixtures thereof, [ Chemical formula 7] Wherein: R 7 and R 8 are independently of one another selected from the group consisting of a hydrogen atom or a linear or branched, saturated or unsaturated hydrocarbon radical containing from 4 to 24 carbon atoms, at least one of the two radicals R 7 or R 8 being a linear or branched, saturated or unsaturated hydrocarbon radical containing from 4 to 24 carbon atoms, It is understood that if one or more phosphorothioate compounds are present, preferably the mass ratio between the thiadiazole compound and the phosphorothioate compound ranges from 1/5 to 2/1, preferably from 1/2 to 1.5/1.
  4. 4. The additive package of any one of claims 1 to 3, further comprising at least one dispersant, preferably a borated dispersant, more preferably a borated dispersant selected from the group consisting of borated succinimides, more preferably borated polyisobutylene succinimides, preferably at least one dispersant comprising 10 to 70 wt%, more preferably 20 to 60 wt% of the total weight of the additive package.
  5. 5. The additive package of any one of claims 1 to 4, wherein the mass ratio between the sulfur content and the phosphorus content provided by the phosphite compound of formula (1) and the thiadiazole compound ranges from 1/1 to 3.5/1.
  6. 6. The additive package of any one of claims 1 to 5, wherein: R and R 1 independently of one another represent a hydrogen atom or a linear or branched alkyl group comprising from 1 to 24 carbon atoms, preferably from 1 to 12 carbon atoms, more preferably from 2 to 8 carbon atoms, preferably R and R 1 represent a linear or branched alkyl group of from 1 to 24 carbon atoms, preferably from 1 to 12 carbon atoms, more preferably from 2 to 8 carbon atoms, And/or -Said at least one thiadiazole compound corresponds to formula (2), wherein R 2 and R 3 independently of each other represent a hydrogen atom, a linear or branched alkyl group comprising 6 to 18 carbon atoms, a group-SR ', wherein R' may be a linear or branched alkyl group comprising 6 to 18 carbon atoms.
  7. 7. The additive package of any one of claims 1 to 6, further comprising at least one phosphorothioate compound, the mass ratio between the thiadiazole compound and the phosphorothioate compound being in the range of 1/5 to 2/1, preferably 1/2 to 1.5/1, preferably the at least one phosphorothioate compound corresponds to formula (6): [ chemical formula 6] Wherein: R 5 and R 6 independently of one another represent a hydrogen atom or a straight-chain or branched, saturated or unsaturated hydrocarbon radical comprising 1 to 24 carbon atoms, said hydrocarbon radical optionally comprising one or more heteroatoms, R 4 represents the group OR 4a OR the group SR 4a , wherein R 4a represents a linear OR branched, saturated OR unsaturated hydrocarbon radical comprising 1 to 24 carbon atoms, said hydrocarbon radical optionally comprising one OR more heteroatoms, X represents a sulfur atom or an oxygen atom, It is understood that if X represents an oxygen atom, R 4 represents a group SR 4a , Preferably, wherein: -R 5 and R 6 represent, independently of each other, a hydrogen atom, or a linear or branched alkyl group comprising 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, and/or X represents a sulfur atom, and/or R 4 represents a group SR 4a , wherein R 4a represents a group R 4b COOH, wherein R 4b represents a linear or branched alkyl group comprising from 1 to 24 carbon atoms, preferably from 1 to 12 carbon atoms, more preferably from 2 to 8 carbon atoms, More preferably, wherein: -R 5 and R 6 represent, independently of each other, a hydrogen atom, or a linear or branched alkyl group comprising from 1 to 24 carbon atoms, preferably from 1 to 12 carbon atoms, more preferably from 2 to 8 carbon atoms, and X represents a sulfur atom, and -R 4 represents a group SR 4a , wherein R 4a represents a group R 4b COOH, wherein R 4b represents a linear or branched alkyl group comprising 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 2 to 8 carbon atoms.
  8. 8. The additive package of any one of claims 1 to 7, further comprising at least one phosphate compound, preferably a phosphate compound corresponding to formula (7): [ chemical formula 7] Wherein: R 7 and R 8 are independently selected from hydrogen atoms or linear or branched, saturated or unsaturated hydrocarbon groups containing 4 to 24 carbon atoms, at least one of the two radicals R 7 or R 8 being a linear or branched, saturated or unsaturated hydrocarbon group containing 4 to 24 carbon atoms.
  9. 9. The additive package of any one of claims 1 to 8, comprising: at least 0.5% by weight, preferably from 0.5 to 20% by weight, more preferably from 1 to 10% by weight, or even from 2 to 5% by weight of phosphite compounds of the formula (1), At least 1% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, or even 3 to 10% by weight of a thiadiazole compound, Optionally 1 to 20 wt%, preferably 2 to 15 wt%, preferably 3 to 10 wt% of a compound selected from (i) a phosphorothioate compound, preferably a phosphorothioate compound corresponding to formula (6), (ii) a phosphate compound, preferably a phosphate compound corresponding to formula (7), and (iii) mixtures thereof, Optionally up to 100% by weight of base oils and/or additives other than phosphite, thiadiazole, phosphate, and thiophosphate additives, Relative to the total weight of the additive package.
  10. 10. The composition of the lubricating composition is a mixture of, the lubricating composition comprises: at least 60% by weight of a base oil, relative to the total weight of the lubricating composition, -At least one additive package according to any one of claims 1 to 9.
  11. 11. The lubricating composition of the preceding claim, comprising: from 80 to 99.5% by weight, preferably from 85 to 99% by weight, of a base oil, 0.5 To 20 wt%, preferably 1 to 15 wt% of the additive package, Relative to the total weight of the lubricating composition.
  12. 12. The lubricating composition of claim 10 or 11, comprising: from 70 to 99% by weight, preferably from 85 to 99% by weight, of a base oil, From 0.01 to 5% by weight, preferably from 0.05 to 1% by weight, of phosphite compounds, 0.01 To 5% by weight, preferably 0.05 to 1% by weight, of a thiadiazole compound, Optionally 0.01 to 5% by weight, preferably 0.05 to 1% by weight, of a compound selected from (i) a phosphorothioate compound, preferably a phosphorothioate compound corresponding to formula (6), (ii) a phosphate compound, preferably a phosphate compound corresponding to formula (7), and (iii) mixtures thereof, Optionally 1 to 20 wt.% of a dispersant, preferably 1 to 15 wt.%, more preferably 2 to 10 wt.% of a dispersant, Optionally up to 100% by weight of additives other than the phosphite, thiadiazole, thiophosphate, phosphate, and dispersant additives, Relative to the total weight of the lubricating composition.
  13. 13. The lubricating composition of any one of claims 10 to 12 having a kinematic viscosity at 100 ℃ in the range of 1 to 20 mm 2 /s, preferably 1.5 to 15mm 2 /s, more preferably 2 to 10 mm 2 /s.
  14. 14. Use of an additive package according to any one of claims 1 to 9 for the preparation of a lubricating composition intended to lubricate at least one mechanical part of a motor vehicle, Preferably, the component is a transmission assembly, and/or Preferably, the motor vehicle is an electric vehicle.
  15. 15. The use of a lubricating composition according to any of claims 10 to 13 for lubricating at least one mechanical component of a motor vehicle, Preferably, the component is a transmission assembly, and/or Preferably, the motor vehicle is an electric vehicle.

Description

Lubricating composition for automotive transmissions Technical Field The invention relates to the field of lubricating compositions (lubricating composition), in particular for motor vehicles, in particular for lubricating transmission components of motor vehicles, in particular transmission gears of internal combustion engines or electric machines. Background The transmission assembly of a motor vehicle operates under high load and high speed. Accordingly, the oil (also referred to as a "lubricating composition" or "lubricant") used in these transmissions should be particularly effective in preventing wear and fatigue of the components, and particularly in protecting gear teeth from the phenomenon of wear (scuffing). Wear occurs under high load conditions and can be assessed by monitoring visual damage. Preventing this phenomenon includes reducing contact stresses by appropriate component geometry and reducing friction by avoiding sticking. The lubricating composition participates in the preventative process, principally by the physicochemical reactivity of its additives. Sulfur, phosphorus or boron containing anti-wear and extreme pressure additives are typically added to impart anti-wear properties to transmission oils. Thus, these additives may have excellent effects on the durability of the lubricating oil into which they are incorporated, but have drawbacks from a corrosion standpoint, especially for copper parts. The inventors of the present invention have found that a specific combination of phosphorus and sulfur containing additives can be used in lubricating compositions having good corrosion resistance properties to copper in addition to good durability. It is therefore an object of the present invention to provide a composition which enables lubrication of components of a manual or automatic transmission, in particular of a transmission gear, preferably an electric vehicle transmission gear, which has improved corrosion resistance properties as well as good durability. Disclosure of Invention More specifically, the invention relates to an additive package comprising: At least one phosphite compound of the formula (1), and At least one thiadiazole compound corresponding to one of the formulae (2), (3), (4), or (5), [ Chemical formula 1] [ Chemical formula 2] [ Chemical formula 3] [ Chemical formula 4] [ Chemical formula 5] Wherein: R and R 1 independently of one another represent a hydrogen atom or a straight-chain or branched, saturated or unsaturated hydrocarbon radical comprising 1 to 24 carbon atoms, said hydrocarbon radical optionally comprising one or more heteroatoms, R 2 and R 3 independently of one another represent a hydrogen atom or a straight-chain or branched, saturated or unsaturated hydrocarbon radical comprising 1 to 24 carbon atoms, said hydrocarbon radical optionally comprising one or more heteroatoms. The bond is shown in dashed lines meaning that the bond may be a double bond or a single bond. If the bond is a ring double bond, the nitrogen atom to which the double bond is attached according to valence rules is not attached to a hydrogen atom. If the bond is an exocyclic double bond, the sulfur atom is not attached to R 2 or R 3 according to the valence rules. At least one of the dashed bonds is a double bond. Preferably, the mass ratio between the phosphite compound of formula (1) and the thiadiazole compound is in the range of 1/10 to 10/1, preferably 1/5 to 5/1, more preferably 1/2 to 2/1. According to one embodiment, the additive package further comprises at least one dispersant, preferably a borated dispersant, more preferably a borated dispersant selected from the group consisting of borated succinimides, more preferably borated dispersants selected from the group consisting of borated polyisobutylene succinimides, preferably the at least one dispersant comprises 10 to 70wt%, more preferably 20 to 60 wt% of the total weight of the additive package. Preferably, the mass ratio between the sulfur content and the phosphorus content provided by the phosphite compound of formula (1) and the thiadiazole compound ranges from 1/1 to 3.5/1. According to one embodiment of the additive package: R and R 1 independently of one another represent a hydrogen atom or a linear or branched alkyl group comprising from 1 to 24 carbon atoms, preferably from 1 to 12 carbon atoms, more preferably from 2 to 8 carbon atoms, preferably R and R 1 represent a linear or branched alkyl group of from 1 to 24 carbon atoms, preferably from 1 to 12 carbon atoms, more preferably from 2 to 8 carbon atoms, And/or -Said at least one thiadiazole compound corresponds to formula (2), wherein R 2 and R 3 independently of each other represent a hydrogen atom, a linear or branched alkyl group comprising 6 to 18 carbon atoms, a group-SR ', wherein R' may be a linear or branched alkyl group comprising 6 to 18 carbon atoms. According to one embodiment, the additive package according to the invention further comprises o