Ethylene-C3 Alpha Olefin Copolymer Dispersants for Low-Temperature Pumpability
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Solution Overview
Problem
Lubricating oils face issues with pumpability at low temperatures, leading to engine failures due to wax/gel structure formation and high viscosity, which existing standards fail to address effectively, particularly evident in extreme weather conditions like those in Sioux Falls, North Dakota.
Innovation Solution
Development of ethylene-C3 alpha olefin copolymers with specific molecular weight, ethylene content, and carbon-carbon double bond characteristics, along with functionalization to create dispersants that improve viscosity and pumpability, addressing the low-temperature performance issues in lubricating oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricating oil is cooled to low temperatures, then the oil forms a gel structure, but this results in excessive yield stress and viscosity causing pumpability failures
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight, ethylene content, and carbon-carbon double bond characteristics of the copolymer dispersant. These parameter adjustments optimize the dispersant's ability to prevent wax crystallization and gel structure formation at low temperatures, thereby maintaining pumpability while managing viscosity
Solution Approach 2:
The patent uses composite materials by combining ethylene and C3 alpha-olefin monomers to create a copolymer dispersant with specific properties. This composite polymer structure provides synergistic effects that enhance low-temperature performance and prevent gel structure formation more effectively than single-polymer dispersants
2Manufacturing precision
If existing dispersants are used to meet standard viscosity specifications, then the oils pass conventional tests, but they fail the MRV test under extreme cold conditions
Solution Approach 1:
The patent applies parameter changes by optimizing the copolymer's molecular weight (1,000-10,000 g/mol), ethylene content (20-80 mol%), and carbon-carbon double bond content (70 mol% or greater). These specific parameter ranges enable the dispersant to maintain effectiveness in preventing wax crystallization under MRV test conditions while meeting standard viscosity specifications
Solution Approach 2:
The copolymer dispersant acts as an intermediary substance that interferes with the wax crystallization process. The carbon-carbon double bonds in the copolymer structure interact with wax molecules, preventing them from forming gel structures that would cause MRV test failures, thereby mediating between the base oil and the problematic wax additives
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 copolymers and derived dispersants enhance the low-temperature performance of lubricating oils, ensuring they meet the MRV test standards by maintaining suitable viscosity and preventing engine pumpability failures, thereby improving cold-weather engine performance.
Implementation Method 1
The copolymer has a number average molecular weight of less than 4,000 g/mol as measured by GPC; wherein the ethylene content of the copolymer is less than 80 mol%; wherein 70 mol% or greater of the copolymer has a carbon-carbon double bond in a terminal monomer unit
Data Source
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AI summary
Ethylene-C3-C10 alpha olefin copolymers, dispersants and lubricating oils/fuel compositions incorporating dispersants, and related methods are generally described herein. The copolymer may comprise ethylene-derived units and C3-C10 alpha-olefin-derived units. The C3-C10 alpha-olefin-derived units may have a carbon number from three to ten. For example, the C3-C10 alpha-olefin-derived units may be propylene-derived units. The dispersants may be made from copolymers having low metal and/or fluorine contents.