Isosorbide Diester Deposit Control in Group II III Lubricants
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Solution Overview
Problem
Group II and III base oils, commonly used in lubricant compositions, have lower solvent power, leading to difficulties in dissolving additives and resulting in the formation of sludge, varnish, and lacquer due to agglomeration of oxidized residues, which interferes with lubricating properties and causes issues like oil consumption, ring sticking, and corrosion.
Innovation Solution
The use of isosorbide diesters as a deposit control agent, which effectively prevents or reduces the formation of sludge, varnish, and lacquer, while also improving the solubilization of additives, with specific hydrocarbon chains and a pour point of at most 15°C, enhancing their solvent power and thermal-oxidative stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Group II and III base oils are used in lubricant compositions, then sulphur content and aromatic content are reduced, but solvent power decreases leading to additive dissolution difficulties and deposit formation
Solution Approach 1:
The patent combines Group II or III base oils with isosorbide diester to create a composite lubricant composition. The isosorbide diester (0.1-10% by weight) compensates for the reduced solvent power of Group II/III base oils, maintaining additive solubility and preventing deposit formation while preserving the low sulphur and aromatic content benefits.
2Object-affected harmful factors
If Group II and III base oils are used, then lower sulphur and aromatic contents are achieved, but deposit formation increases due to reduced ability to dissolve additives and compatibilize oxidized residues
Solution Approach 1:
The patent creates a composite system where isosorbide diester works synergistically with Group II/III base oils. The isosorbide diester specifically targets deposit prevention by maintaining additive solubility and compatibilizing oxidized residues, thereby eliminating sludge, varnish, and lacquer formation while preserving the environmental benefits of low sulphur and aromatic content.
Solution Approach 2:
The isosorbide diester acts as an intermediary substance that mediates between the low-solvent-power Group II/III base oils and the additives/oxidized residues. It facilitates proper dissolution and dispersion without requiring high aromatic content, thus preventing deposit formation while maintaining the desired base oil composition.
3Object-generated harmful factors
If conventional deposit control agents are used, then deposit formation is controlled, but the need for additional additives increases formulation complexity
Solution Approach 1:
The isosorbide diester performs multiple functions simultaneously: it acts as a solvent for additives, a deposit control agent preventing sludge and varnish formation, and a compatibilizer for oxidized residues. This multi-functionality reduces the need for separate additive packages, simplifying the overall formulation while maintaining effective deposit control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Isosorbide diesters demonstrate superior deposit control properties, reducing sludge formation and improving additive solubility, thereby maintaining the performance and longevity of lubricant compositions by preventing unwanted deposits and enhancing the stability of lubricant systems.
Implementation Method 1
Group II and III base oils present a lower solvent power, meaning it is more difficult for them to dissolve some additives and to compatibilize the residues of oxidized base oil within the bulk solution
Implementation Method 2
it is more difficult for them to dissolve some additives and to compatibilize the residues of oxidized base oil within the bulk solution
Implementation Method 3
Sludge, varnish and lacquer are different formats of deposit composed of residues of oxidized base oil formed when a lubricant composition is exposed to high temperature conditions in the presence of oxygen, nitrogen oxides and oxidation-derived hydroperoxides, resulting in the oxidation of the base oil
Data Source
AI summary
The present invention relates to the use of isosorbide diesters as a deposit control agent and optionally additive solubilizing agent. It also concerns lubricant compositions comprising it, and methods for reducing/preventing deposits and optionally improving solubilizing property of base oils.