Lubricating oil composition

By adding citric acid and its derivatives, along with specific additives, to the lubricating oil composition, the problem of air entrainment in the lubricating oil is solved, improving air release properties and overall performance. This method is suitable for industrial lubricating oil compositions such as hydraulic oils, gear oils, compressor oils, and turbine oils.

CN120936698APending Publication Date: 2025-11-11SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV
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Patent Information

Application Number
CN202480021773.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-04-05
Filing Date
2024-04-02
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing industrial lubricating oil compositions suffer from severe air entrainment, leading to problems such as loss of lubricity, oxidation, high operating noise, low efficiency, and high oil temperature, which are particularly pronounced in hydraulic systems.

Method used

Add at least 80% base oil and a small amount of additives to the lubricating oil composition, including citric acid and its derivatives, as well as additives for anti-wear, rust prevention, corrosion inhibition, dispersing, extreme pressure, friction modification, viscosity index improvement and pour point reduction, and avoid using demulsifiers and foam inhibitors.

Benefits of technology

It significantly improves the air release properties of lubricating oil, reduces air entrainment time, maintains or slightly improves foaming and demulsification properties, and enhances the overall performance of lubricating oil.

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Abstract

The present invention provides a lubricating oil composition comprising at least 80% by weight, based on the total weight of the lubricating oil composition, of a base oil wherein the base oil is selected from the group consisting of Group II base oils, Group III base oils, and Fischer-Tropsch derived base oils, and mixtures thereof; one or more additives, other than citric acid, selected from the group consisting of antiwear additives, rust inhibitors and corrosion inhibitors, dispersants, extreme pressure additives, friction modifiers, viscosity index improvers, pour point depressants, antioxidants; and one or more of citric acid and derivatives thereof. The invention also provides the use of an additive selected from one or more of citric acid and derivatives thereof in a lubricating oil composition comprising at least 80% by weight, based on the total weight of the lubricating oil composition, of a base oil for improving the air release properties of said lubricating oil composition as measured by ASTM D3427, wherein the base oil is selected from the group consisting of Group II base oils, Group III base oils and Fischer-Tropsch derived base oils and mixtures thereof; and one or more additives, other than citric acid, selected from the group consisting of antiwear additives, rust inhibitors and corrosion inhibitors, dispersants, extreme pressure additives, friction modifiers, viscosity index improvers, pour point depressants, antioxidants.
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