LUBRICATING OIL COMPOSITION AND METHOD FOR LUBRICATING SLIDING MATERIAL WHILE PREVENTING ELUTION OF COPPER AND LEAD

• US 20150203780A1
• Filed: 06/07/2013
• Published: 07/23/2015
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Original Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Inventors: Yagishita, Kazuhiro
• Granted Patent: US 9,422,501 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C10M 133/40 Six-membered ring containing nitrogen and carbon only
• CPC Class Codes: C10M 141/10 at least one of them being an organic phosphorus-containing compound
• CPC Class Codes: C10M 141/12 at least one of them being an organic compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2215/04 having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2215/044 having cycloaliphatic groups
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/221 Six-membered rings containing nitrogen and carbon only
• CPC Class Codes: C10M 2215/223 Five-membered rings containing nitrogen and carbon only
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/068 Thiocarbamate metal salts
• CPC Class Codes: C10M 2223/04 Phosphate esters
• CPC Class Codes: C10M 2223/042 Metal salts thereof
• CPC Class Codes: C10M 2223/043 Ammonium or amine salts thereof
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2030/04 Detergent property or dispersant property
• CPC Class Codes: C10N 2030/10 : Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/12 : Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• CPC Class Codes: C10N 2030/52 : Base number [TBN]

Abstract

The present invention provides a lubricating oil composition having excellent NOx resistance, anti-oxidation properties, base number retainability and detergency, suitably used for an internal combustion engine. The lubricating oil composition comprises a lubricating base oil, (A) a 2,2,6,6-tetraalkylpiperidine derivative and (B) an organic molybdenum compound and/or an organic tungsten compound and preferably further comprises (C) a hindered phenol-type anti-oxidant and/or an aromatic amine-type anti-oxidant or (D) at least one type of compound selected from the group of consisting of phosphorus compounds and metal salts or amine salts. Furthermore, the present invention also provides a method for lubricating a sliding material by contacting a specific lubricating oil composition selected from the above lubricating oil compositions with the sliding material while preventing elution of the copper and lead contained in the material.

Claims

1. A lubricating oil composition comprising a lubricating base oil, (A) a 2,2,6,6-tetraalkylpiperidine derivative and (B) an organic molybdenum compound and/or an organic tungsten compound.

2. The lubricating oil composition according to claim 1 further comprising (C) a hindered phenol-type anti-oxidant and/or an aromatic amine-type anti-oxidant.

3. The lubricating oil composition according to claim 1 further comprising (D) at least one type of compound selected from the group consisting of phosphorus compounds represented by formula (1) and metal salts or amine salts thereof in an amount of 0.005 to 0.5 percent by mass as phosphorus:

4. The lubricating oil composition according to claim 3 wherein Component (D) is a sulfur-free phosphorus acid ester metal salt represented by formula (2) and/or formula (3):

9. The lubricating oil composition according to claim 2 further comprising (D) at least one type of compound selected from the group consisting of phosphorus compounds represented by formula (1) and metal salts or amine salts thereof in an amount of 0.005 to 0.5 percent by mass as phosphorus:

5. A method for lubricating a sliding material while preventing elution of the copper and/or lead contained in the material, comprising contacting a lubricating oil composition comprising a lubricating base oil, (A) a 2,2,6,6-tetraalkylpiperidine derivative, (B) an organic molybdenum compound in an amount of 30 to 300 ppm by mass as molybdenum and (C) a hindered phenol-type anti-oxidant and/or an aromatic amine-type anti-oxidant with a copper- and/or lead-containing sliding material.

6. The method for lubrication according to claim 5 wherein the lubricating oil composition further comprises (D) at least one type of compound selected from the group consisting of phosphorus compounds represented by formula (1) and metal salts or amine salts thereof in an amount of 0.005 to 0.5 percent by mass as phosphorus:

7. The method for lubrication according to claim 6 wherein Component (D) is a sulfur-free phosphorus acid ester metal salt represented by formula (2) and/or formula (3):

8. The method for lubrication according claim 5 wherein the lubricating oil composition is used in an internal combustion engine where copper- and/or lead-containing sliding materials are used.