Quaternised Polyester Salt Lubricant for Engine Deposit Control
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Solution Overview
Problem
Current lubricant compositions face challenges in reducing deposit formation in internal combustion engines, particularly with the increasing demands of new engine specifications like ILSAC GF-5, which require improved dispersancy and cleanliness to meet higher piston merit ratings.
Innovation Solution
A lubricating composition comprising an oil of lubricating viscosity and a quaternised polyester salt, formed by reacting a polyester with a tertiary amino group and a quaternising agent such as a dialkyl sulphate or an organic carbonate, combined with a succinimide dispersant, to enhance dispersancy and reduce sludge formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional lubricant compositions are used, then basic lubrication function is maintained, but deposit formation increases and dispersancy is insufficient for new engine specifications
Solution Approach 1:
The patent modifies the chemical structure of polyester additives by introducing quaternary ammonium groups through reaction with agents like dimethyl sulfate or epichlorohydrin. This structural parameter change transforms the additive's properties to achieve superior dispersancy and deposit control, meeting ILSAC GF-5 specifications with piston merit ratings of 4.0 or higher
Solution Approach 2:
The invention creates a composite additive system combining quaternised polyester salts with specific molecular weight ranges (Mn 500-3000) and controlled quaternisation degrees (20-80%). This composite approach integrates multiple functional properties into a single additive package, achieving both excellent dispersancy and deposit control
2Object-affected harmful factors
If ILSAC GF-5 specification requirements are met with higher piston merit ratings, then deposit control is improved, but additive composition complexity increases
Solution Approach 1:
The patent extracts and isolates the specific functional component (quaternary ammonium group) from complex additive packages. By focusing on this single modified structure with controlled molecular parameters, the invention achieves GF-5 compliance without requiring multiple different additive types, thereby reducing overall composition complexity
Data Source
AI summary
The invention provides a lubricating composition containing a lubricating composition comprising an oil of lubricating viscosity and a quaternised polyester salt. The invention further relates to a method of lubricating a mechanical device (such as an internal combustion engine) with the lubricating composition. The invention further relates to the use of the quaternised polyester salt as a dispersant.