Amine-Functionalized Dispersant Viscosity Modifiers for Engine Lubricants
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Solution Overview
Problem
Traditional dispersant viscosity modifiers used in engine lubricating compositions provide inadequate antiwear protection and corrosion resistance, especially in high soot conditions, leading to increased wear and corrosion of engine components.
Innovation Solution
A lubricating composition incorporating an oil-soluble dispersant viscosity modifier with an olefin-based polymer backbone, derived from an ethylene-propylene copolymer, and pendent groups from aminoethyl ethylene urea attached via succinimide linkage, offering improved viscosity control, antiwear performance, and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional dispersant viscosity modifiers (ethylene-propylene copolymers grafted with maleic anhydride and reacted with various amines) are used, then viscosity control is improved, but antiwear protection and corrosion resistance deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters of the dispersant viscosity modifier by using olefin copolymers with specific compositions (5-50 mol% ethylene, 50-95 mol% alpha-olefin) and controlling molecular weight (10,000-100,000 g/mol), while modifying the pendant groups to include aromatic amines, thereby improving both viscosity stability and antiwear/corrosion resistance simultaneously
Solution Approach 2:
The invention creates a composite additive system by combining the olefin copolymer backbone with grafted maleic anhydride units and aromatic amine pendant groups, forming a multi-functional dispersant viscosity modifier that provides both viscosity control and enhanced protective properties
2Ease of operation
If traditional dispersant viscosity modifiers are used, then oil fluidity is improved, but wear protection of engine components deteriorates
Solution Approach 1:
The patent optimizes the polymer parameters including molecular weight (10,000-100,000 g/mol), copolymer composition (5-50 mol% ethylene), and pendant group structure with aromatic amines, achieving a balance between fluidity enhancement and wear protection
3Stability of the object's composition
If traditional dispersant viscosity modifiers are used, then viscosity index improvement is achieved, but corrosion resistance of seals and components deteriorates
Solution Approach 1:
The invention modifies the chemical composition parameters by incorporating aromatic amine groups into the pendant structure, which provide both viscosity index improvement and corrosion resistance through the aromatic ring structure's ability to form protective films on metal surfaces
Solution Approach 2:
The composite structure combines the olefin copolymer backbone with aromatic amine-functionalized pendant groups, creating a multi-functional additive that simultaneously achieves viscosity index improvement and corrosion protection
Data Source
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AI summary
A lubricating composition includes an oil of lubricating viscosity and an oil-soluble dispersant viscosity modifier. The dispersant viscosity modifier includes an olefin-based polymer backbone and at least one pendent group derived from a functionalized aliphatic amine. Each pendent group is independently attached to the olefin-based polymer backbone. The pendent group is non-ionic, non-basic, and non-acidic and includes a functional group which includes at least one heteroatom other than nitrogen.