KR-20260062963-A - lubricating oil composition

Abstract

A lubricating oil composition is disclosed. The composition relates to a lubricating oil composition comprising a large amount of lubricating viscosity oil, a phosphorus-containing additive, and at least one sulfur-containing additive, wherein the sulfur-containing additive is thiadiazole, dithiadiazole, dimercaptodithiadiazole, dimercaptodithiadiazole oligomer, or a derivative or analog thereof.

Inventors

• 홀브룩, 트레비스 폴
• 체이스, 케빈 존
• 하페지, 네마

Assignees

• 셰브런 오로나이트 컴퍼니 엘엘씨

Dates

Publication Date

20260507

Application Date

20240828

Priority Date

20230831

Claims (14)

1. As a lubricating oil composition, a. A large amount of lubricating viscosity oil; b. Phosphorus-containing additives; and c. A lubricating oil composition comprising at least one sulfur-containing additive, wherein the sulfur-containing additive is thiadiazole, dithiadiazole, dimercaptodithiadiazole, dimercaptodithiadiazole oligomer, or a derivative or analog thereof.
2. In claim 1, the lubricating oil composition contains less than 2,000 ppm of sulfur based on the total weight of the lubricating oil composition.
3. A lubricating oil composition according to claim 1, wherein the phosphorus-containing additive is hydrocarbyl phosphite, hydrocarbyl phosphonate, hydrocarbyl thiophosphite, phosphonic acid, hydrocarbyl phosphate ester, or polymeric polyphosphite.
4. A lubricating oil composition according to claim 1, wherein the phosphorus-containing additive is dihydrocarbyl phosphite, trihydrocarbyl phosphite, or dihydrocarbyl phosphonate.
5. A lubricating oil composition according to claim 1, wherein the dimercaptodithiadiazole oligomer is a dimer, trimer, or tetramer.
6. In claim 1, the above sulfur-containing additive is a salt, a lubricating oil composition.
7. A lubricating oil composition according to claim 1, further comprising a dispersant, a cleaning agent, a friction modifier, an antifoaming agent, a seal swelling agent, an anti-emulsifier, a pour point depressant, a metal inert, an antioxidant, or a corrosion inhibitor.
8. A method for improving the wear performance of a motor equipped with an electric drive system, wherein the method comprises the step of lubricating the motor with a lubricating oil composition comprising the following components, and wherein the lubricating oil composition a. A large amount of lubricating viscosity oil; b. Phosphorus-containing additives; and c. A method comprising at least one sulfur-containing additive, wherein the sulfur-containing additive is thiadiazole, dithiadiazole, dimercaptodithiadiazole, dimercaptodithiadiazole oligomer, or a derivative or analog thereof.
9. In claim 8, the method wherein the lubricating oil composition contains less than 2000 ppm of sulfur based on the total weight of the lubricating oil composition.
10. In claim 8, the phosphorus-containing additive is hydrocarbyl phosphite, hydrocarbyl phosphonate, hydrocarbyl thiophosphite, phosphonic acid, hydrocarbyl phosphate ester, or polymeric polyphosphite.
11. In claim 8, the method wherein the phosphorus-containing additive is dihydrocarbyl phosphite, trihydrocarbyl phosphite, or dihydrocarbyl phosphonate.
12. In claim 8, the method wherein the dimercaptodithiadiazole oligomer is a dimer, trimer, or tetramer.
13. In claim 8, the above sulfur-containing additive is a salt, method.
14. In claim 8, the method further comprises a dispersant, a cleaning agent, a friction modifier, an antifoaming agent, a seal swelling agent, an anti-emulsifier, a pour point depressant, a metal inert, an antioxidant, or a corrosion inhibitor.

Description

lubricating oil composition Cross-reference regarding related applications This application claims priority to U.S. Provisional Application No. 63/535,648 filed on August 31, 2023, the full text of which is incorporated herein by reference. Technology field The present disclosure relates to a lubricating oil additive composition and a lubricating oil composition containing the same. In particular, such a composition improves the gear wear performance (e.g., scratch resistance, seizing resistance) of an electric vehicle. Dimercaptothiadiazoles (DMTDs) are widely used as metal chelating agents and also have potential applications as wear-resistant, corrosion-resistant, or rust-preventive agents. The inclusion of dimercaptothiadiazoles or related compounds in lubricating oils has been limited due to solubility issues. For this reason, dimercaptothiadiazoles or related compounds often need to be pre-mixed with other additives (e.g., dispersants) before being added to lubricant additive packages or lubricating oils. Therefore, it is necessary to develop lubricant compositions that can leverage potential benefits by improving the compatibility of dimercaptothiadiazole and related compounds within lubricants. Dimercaptothiadiazole and related compounds also have the potential to be utilized in novel lubricants, such as electric drive fluids. The present invention provides an additive for a lubricating oil composition or a drivetrain lubricating oil composition that improves the solubility of dimercaptothiadiazole and its derivatives at a low sulfur content while simultaneously improving wear resistance (i.e., scratch resistance). In one embodiment, the present disclosure relates to a lubricating oil composition comprising a large amount of lubricating oil, a phosphorus-containing additive, and at least one sulfur-containing additive, wherein the sulfur-containing additive is thiadiazole, dithiadiazole, dimercaptodithiadiazole, dimercaptodithiadiazole oligomer, or a derivative or analog thereof. In another aspect, the present disclosure relates to a method for improving the wear performance of a motor characterized by an electric drive system, the method comprising the step of lubricating the motor with a lubricating oil composition comprising a large amount of lubricating oil, a phosphorus-containing additive, and at least one sulfur-containing additive, wherein the sulfur-containing additive is a thiadiazole, dithiadiazole, dimercaptodithiadiazole, dimercaptodithiadiazole oligomer, or a derivative or analog thereof. In the present invention, ‘a major amount’ of base oil means that the content of said base oil is at least 40 wt.% based on the total weight of the lubricating oil composition. In some embodiments, ‘a major amount’ of base oil means an amount of base oil exceeding 50 wt.%, 60 wt.%, 70 wt.%, 80 wt.%, or 90 wt.% of the lubricating oil composition. The term 'hydrocarbyl' means a moiety containing both carbon and hydrogen atoms. In some embodiments, hydrocarbyl may mean a hydrocarbon containing heteroatoms (e.g., sulfur, nitrogen, oxygen, etc.). Hydrocarbyl may mean a saturated or unsaturated group, an aliphatic or aromatic group, or a branched or unbranched group. As used herein, electric drive fluid or electric drive system fluid (EDF) refers to a lubricant used in electric vehicles equipped with electric vehicle motors. Electric drive fluids are similar to transmission fluids used in conventional vehicles, but they typically possess one or more additional functions (e.g., acting as a coolant for electric vehicle motors, providing enhanced electrical resistance, enhanced yellow metal compatibility, etc.). One or more additional functions may present unique challenges in formulating fluids for electric vehicles. The present disclosure relates to a lubricant additive composition and a lubricant composition containing the same. Without being limited to theory, it is believed that through the synergistic effect of the additives, the compatibility of thiadiazole or thiadiazole-like compounds within the lubricant composition is enhanced and wear resistance is improved. Such synergistic combinations are particularly suitable for use in vehicles equipped with electric drive systems (i.e., vehicles equipped with electric motors, such as electric vehicles, hybrid vehicles, and plug-in hybrid vehicles). The present disclosure relates to a lubricating oil composition comprising, as described herein, a) a large amount of lubricating viscous oil; b) hydrocarbyl phosphite or phosphonate; and c) at least one sulfur-containing additive. Phosphorus-containing additives The lubricating oil composition of the present disclosure comprises one or more phosphorus-containing additives. The phosphorus-containing additive may be hydrocarbyl phosphite, hydrocarbyl phosphonate, hydrocarbyl thiophosphite, phosphonic acid, hydrocarbyl phosphate ester, or polymeric polyphosphite. More specifically, hydrocarbyl phosphite/phosphonate c