Use of nanoscale materials in a composition for preventing symptoms of fatigue in the surface-closed structure of drive elements

• US 20140162914A1
• Filed: 05/09/2012
• Published: 06/12/2014
• Est. Priority Date: 06/01/2011
• Status: Active Grant

• Current Assignee: Klüber Lubrication München SE & Co. KG (Freudenberg & Company KG)
• Original Assignee: Klüber Lubrication München SE & Co. KG (Freudenberg & Company KG)
• Inventors: Grundei, Stefan, Schmidt-Amelunxen, Martin, Krutzsch, Carla
• Granted Patent: US 9,296,970 B2
• Time in Patent Office: Days
• US Class Current: 508/126
• CPC Class Codes: C10M 125/10 Metal oxides, hydroxides, carbonates or bicarbonates
• CPC Class Codes: C10M 125/26 Compounds containing silicon or boron, e.g. silica, sand
• CPC Class Codes: C10M 141/02 at least one of them being an organic oxygen-containing compound
• CPC Class Codes: C10M 147/02 Monomer containing carbon, hydrogen and halogen only
• CPC Class Codes: C10M 2201/062 Oxides; Hydroxides; Carbonates or bicarbonates
• CPC Class Codes: C10M 2201/105 Silica
• CPC Class Codes: C10M 2209/1033 used as base material
• CPC Class Codes: C10M 2209/1045 used as base material
• CPC Class Codes: C10M 2209/1055 used as base material
• CPC Class Codes: C10M 2227/04 having a silicon-to-carbon bond, e.g. organo-silanes
• CPC Class Codes: C10M 2229/02 Unspecified siloxanes; Silicones
• CPC Class Codes: C10N 2020/055 Particles related characteristics
• CPC Class Codes: C10N 2020/06 Particles of special shape or size
• CPC Class Codes: C10N 2020/061 Coated particles
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/04 Detergent property or dispersant property
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/12 Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• CPC Class Codes: C10N 2070/00 Specific manufacturing methods for lubricant compositions
• CPC Class Codes: C10N 2070/02 Concentrating of additives

Abstract

A composition for prevention or reduction of fatigue damage, especially trench formation or micropitting, of the surfaces of drive elements, is provided that comprises 0.1 to 40% by weight of surface-modified nanoparticles, and 99.9 to 60% by weight of a carrier material suitable for application to the drive element surfaces.

Claims

1. A composition for prevention or reduction of fatigue damage, especially trench formation or micropitting, of the surfaces of drive elements, comprising:

(a) 0.1 to 40% by weight of surface-modified nanoparticles and

(b) 99.9 to 60% by weight of a carrier material suitable for application, to the drive element surfaces.

2. The composition as claimed in claim 1, wherein the surface-modified nanoparticles are oxidic nanoparticles.

3. The composition as claimed in claim 1, wherein the surface-modified nanoparticles are selected from silicon dioxide, zinc oxide and aluminum oxide.

4. The composition as claimed in any of claim 1, wherein the surface modification of the nano-particles is brought about by means of surface-modifying reagents selected from alkyl-, aryl- and alkylarylsilanes having at least 1 to 3 of these alkyl, aryl and alkylaryl groups which may additionally contain functional groups, especially thio groups, phosphate groups, and which are used individually or in combination, and wherein the additional functional groups can react with metal surfaces.

5. The composition as claimed in claim 1, wherein the amount of modifying reagent per nm² of the nanoparticle surface is 0.1 with 10 molecules of the modifying reagent.

6. The composition as claimed in claim 1, wherein the composition further comprises mixtures of nanoparticles having both different substances and different particle sizes.

7. The composition as claimed in claim 1, wherein the surface-modified nanoparticles have a particle size of 10 nm to less than 200 nm, wherein the particle size is determined by dynamic light scattering in dispersion.

8. The composition as claimed in claim 1, wherein the carrier material present in the composition is selected from the group consisting of synthetic and native ester oils, polyglycols, synthetic hydrocarbon oils.

9. The composition as claimed in claim 1, wherein the composition is introduced into a lubricant selected from the group of the greases, pastes, oils.

10. The composition as claimed in claim 9, wherein the lubricant is selected from the group consisting of a lubricant oil or mixtures of lubricant oils, polyglycols, silicone oils, perfluoropolyethers, mineral oils, ester oils, hydrocarbon oils, phenyl ether oils, native oils, derivatives of native oils, an organic or inorganic thickener, especially PTFE, graphite, metal oxides, boron nitride, molybdenum disulfide, phosphates, silicates, sulfonates, polyimides, metal soaps, metal complex soaps, ureas and mixtures thereof, solid lubricants such as graphite, MoS₂.

11. The composition as claimed in claim 9, wherein the following are additionally present in the composition:

soluble additives, especially aromatic amines, phenols, phosphates, sulfur carriers and anticorrosives, antioxidants, antiwear agents, friction reducers, agents for protection against metal influences, UV stabilizers.

12. The composition as claimed in claim 1, wherein the carrier material is a lubricant, and the composition is based on the final formulation, in an amount of 0.1 to 10% nanoparticles, 99.9 to 90% lubricant.

13. A method for prevention or reduction of fatigue damage, especially trench formation or micropitting, of the surfaces of a drive element, comprising applying the composition of claim 1 to one or more surfaces of the drive element.

14. A method for prevention or reduction of fatigue damage, especially trench formation or micropitting, of the surfaces of a drive element, comprising:

introducing the composition of claim 1 into a lubricant selected from the group of greases, pastes and oils; and

applying the lubricant to one or more surfaces of the drive element.