LUBRICATING OIL COMPOSITION FOR ENGINE MADE OF ALUMINUM ALLOY AND LUBRICATION METHOD

• US 20150072907A1
• Filed: 03/12/2013
• Published: 03/12/2015
• Est. Priority Date: 03/21/2012
• Status: Active Grant

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Ldemitsu Kosan Company Limited
• Inventors: Takashima, Yoriyuki, Iwasaki, Junya, Shimizu, Yasunori
• Granted Patent: US 9,790,450 B2
• Time in Patent Office: Days
• US Class Current: 508/192
• CPC Class Codes: C10M 141/08 at least one of them being an organic sulfur-, selenium- or tellurium-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 161/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• 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 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/086 Imides
• 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 2219/102 containing sulfur and carbon only in the ring
• CPC Class Codes: C10M 2219/104 containing sulfur and carbon with nitrogen or oxygen in the ring
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2227/00 Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
• CPC Class Codes: C10M 2229/02 Unspecified siloxanes; Silicones
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/42 Phosphor free or low phosphor content compositions
• CPC Class Codes: C10N 2030/43 Sulfur free or low sulfur content compositions
• CPC Class Codes: C10N 2030/45 : Ash-less or low ash content
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2060/14 : by boron or a compound containing boron

Abstract

The invention provides a lubricating oil composition for an engine made of aluminum alloy containing a base oil, a succinimide compound, and a thioheterocyclic compound represented by the following formula (I) and has a sulfur content of 0.10 mass % to 1.00 mass % based on the total amount of the composition, and a phosphorus content and a sulfated ash content, based on the total amount of the composition, falling within specific ranges, and a lubrication method employing the composition. The composition exhibits excellent wear resistance to aluminum alloy sliding parts of engines and can considerably reduce the high-phosphorus ZnDTP content and the metallic detergent content, while excellent wear resistance to aluminum alloy is maintained. The thioheterocyclic compound is represented by the formula:

(R¹)_k—(S)_m-A_S-(S)_n—(R²)_l  (I)

(wherein As represents a thioheterocycle; each of R¹ and R² independently represents a hydrogen atom, an amino group, a C1 to C50 hydrocarbyl group selected from among an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, and an aryl group, or, in the case of a hydrocarbyl group, a C1 to C50 heteroatom-containing group having an atom selected from among an oxygen atom, a nitrogen atom, and a sulfur atom, in the hydrocarbyl group; and each of k, l, m, and n is an integer of 0 to 5).

Claims

1. :

A lubricating oil composition, comprising;

a base oil,

a succinimide compound, and

a thioheterocyclic compound represented by (I);

(R¹)_k—

(S)_m-A_S-(S)_n—

(R²)_l 

 

(I)

where

As represents a thioheterocycle;

each of R¹ and R² independently represents a hydrogen atom, an amino group, a C1 to C50 hydrocarbyl group selected from the group consisting of an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, and an aryl group, or, in the case of a hydrocarbyl group, a C1 to C50 heteroatom-containing group having an atom selected from the group consisting of an oxygen atom, a nitrogen atom, and a sulfur atom; and

each of k, l, m, and n is an integer of 0 to 5,

wherein

the composition has a sulfur content of 0.10 mass % to 1.00 mass % based on the total amount of the composition, and

a phosphorus content represented by P in mass % and a sulfated ash content represented by M in mass %, based on the total amount of the composition, satisfying any of the following conditions A to C;

condition A;

P<

0.03, and M<

0.3;

condition B;

P<

0.03, and 0.3≦

M≦

0.6; and

condition C;

0.03≦

P≦

0.06, and M<

0.3.

2. :

The composition according to claim 1, wherein a nitrogen content attributed to the succinimide compound is from 0.08 mass % to 0.40 mass %, based on the total amount of the composition.

3. :

The composition according to claim 2, wherein the succinimide compound comprises a boron derivative thereof.

4. :

The composition according to claim 1, wherein, in formula (I), the case where both m and n are 0 is excluded.

5. :

The composition according to claim 1, wherein, in formula (I), the thioheterocyclic compound is a thiadiazole ring.

6. :

The composition according to claim 5, wherein the thiadiazole ring is a 1,3,4-thiadiazole ring to which sulfur atoms are bonded to the 2-position and the 5-position of the ring.

7. :

The composition according to claim 6, wherein one sulfur atom is bonded to each of the 2-position and the 5-position of the 1,3,4-thiadiazole ring.

8. :

A method for lubricating an engine made of aluminum alloy, the method comprising;

applying, to a sliding part of the engine, the composition according to claim 1,

wherein the sliding part is made of aluminum alloy.

9. :

The composition according to claim 1, wherein the composition is suitable for an engine made of aluminum alloy.