Multiple Function Graft Polymer Lubricant Additive
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Solution Overview
Problem
Current lubricating oil compositions require multiple additives to achieve optimal performance, which increases costs and can have adverse effects on other properties, and there is a need for additives that provide multiple benefits without compromising anti-oxidant properties, especially with stringent phosphorus content limits in automotive emissions standards.
Innovation Solution
A novel multiple-function graft polymer with a weight average molecular weight of 10,000 to 500,000, comprising ethylenically unsaturated aliphatic or aromatic monomers, a condensation product of an amine and a coupling agent, and an organo-metallic compound, which imparts dispersancy, viscosity, sludge, varnish, soot control, and anti-wear properties without adverse effects on anti-oxidant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple additives are used to achieve optimal lubricating oil performance, then performance characteristics such as detergency, dispersancy, anti-wear, and viscosity control are improved, but the cost increases and adverse effects on other properties occur
Solution Approach 1:
The patent combines multiple additive functions (dispersancy, viscosity modification, sludge control, soot control, and anti-wear properties) into a single graft polymer molecule. The polymer backbone provides viscosity improvement while grafted monomers provide dispersancy and sludge control, and organo-metallic compounds provide anti-wear properties, eliminating the need for multiple separate additives.
Solution Approach 2:
The graft polymer is designed to perform multiple functions simultaneously: the polyolefin backbone provides viscosity index improvement, grafted ethylenically unsaturated monomers provide dispersancy and sludge control, and attached organo-metallic compounds provide anti-wear protection. This multi-functional additive reduces the total number of components required in the lubricating oil composition.
2Reliability
If phosphorus-containing anti-wear additives are used to reduce engine wear, then anti-wear properties are improved, but phosphorus content increases which violates stringent emissions standards
Solution Approach 1:
The patent changes the chemical composition parameters by using organo-metallic compounds with metals other than phosphorus (such as molybdenum, zinc, or calcium) to provide anti-wear properties. This substitution maintains the anti-wear function while reducing phosphorus content to meet emissions standards.
3Reliability
If multiple separate additives are used to control different properties, then each property is optimized, but the overall formulation complexity and cost increase
Solution Approach 1:
The patent merges multiple additive functions into a single molecular structure where a polyolefin backbone is grafted with functional monomers and organo-metallic compounds, providing viscosity control, dispersancy, sludge control, and anti-wear properties in one component.
Solution Approach 2:
The graft polymer is designed as a universal additive that simultaneously performs multiple functions: the backbone provides viscosity index improvement, grafted monomers provide dispersancy and sludge control, and organo-metallic compounds provide anti-wear protection, reducing the total quantity of additive components needed.
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 polymer provides enhanced performance by integrating multiple functions into a single additive, reducing the need for multiple components, maintaining anti-oxidant properties, and meeting stringent phosphorus content limits, thus improving lubricating oil efficiency and compliance with emerging emission standards.
Implementation Method 1
a graft polymer of: (a) a polymer having graftable sites; (b) a graftable coupling agent; (c) a graftable ethylenically unsaturated monomer
Implementation Method 2
an organo-metallic compound capable of reacting with said graft polymer and imparting anti-wear properties
Data Source
AI summary
The composition and preparation of multifunctional graft polymers useful as dispersants are described. The dispersants described are suitable for controlling sludge and varnish as well as soot, friction and wear. The product is useful as a lubricant additive.