Succinimide Additive Composition for Engine Dispersancy
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Solution Overview
Problem
Current lubricant formulations face challenges in effectively dispersing particulate matter in internal combustion engines, leading to issues like filter plugging and oil thickening due to inadequate dispersancy.
Innovation Solution
A lubricating oil additive composition is developed by reacting polyalkenyl succinic acid or anhydride with a polyalkylene polyamine, followed by post-treatment with phthalic or naphthalic anhydride, and then with a cyclic carbonate, resulting in a succinimide or succinamide with remaining basic nitrogen, enhancing dispersancy properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dispersants are used in lubricant formulations, then basic dispersancy is provided, but inadequate particulate matter dispersancy results in filter plugging and oil thickening
Solution Approach 1:
The patent modifies the chemical structure of dispersants by reacting polyalkenyl succinic acid or anhydride with polyalkylene polyamine to form succinimide or succinamide derivatives with remaining basic nitrogen. This chemical parameter change creates a new class of dispersants with superior particulate matter dispersancy that prevents filter plugging and oil thickening while maintaining solubility in lubricating oils.
Solution Approach 2:
The invention creates a composite dispersant molecule combining polyalkenyl succinic acid backbone with polyalkylene polyamine side chains and aromatic anhydride modifications. This composite structure integrates the dispersancy of the succinic acid portion with the solubility and stability contributions from the polyamine and aromatic components, achieving both improved particulate matter dispersancy and oil compatibility.
2Reliability
If dispersant concentration is increased to improve dispersancy, then particulate matter dispersancy improves, but oil viscosity increases
Solution Approach 1:
The patent optimizes the molecular weight and structural parameters of the dispersant molecules to achieve effective dispersancy at lower concentrations. The polyalkenyl succinic acid/polyalkylene polyamine reaction products with controlled basic nitrogen content provide high dispersancy efficiency, allowing use at concentrations that do not significantly increase oil viscosity while still preventing particulate matter aggregation.
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
The additive composition significantly improves dispersancy, reducing soot thickening and filter plugging, as demonstrated by lower viscosity increases in soot thickening bench tests, thereby extending engine performance and reducing maintenance needs.
Implementation Method 1
reacting a polyalkenyl succinic acid or a polyalkenyl succinic anhydride with at least one polyalkylene polyamine, having at least three nitrogen atoms, thereby producing a succinimide or succinamide or mixtures thereof
Implementation Method 2
reacting the product of step (A) with a phthalic anhydride or naphthalic anhydride post-treating agent or mixtures thereof, thereby producing an initial post-treated succinimide or succinamide or mixtures thereof
Data Source
AI summary
An oil-soluble lubricating oil additive composition prepared by a process which comprises reacting a succinimide, succinamide or mixtures thereof with a first post-treating agent, thereby producing an initial post-treated product which is reacted with a second post-treating agent.