Propylene Copolymer Viscosity Modifier for Lubricants
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Solution Overview
Problem
Conventional lubricating oil compositions face challenges in achieving both low-temperature properties and fuel efficiency at high temperatures, with existing viscosity modifiers improving low-temperature viscosity but leaving room for improvement in high-temperature fuel efficiency.
Innovation Solution
A lubricating oil composition using a propylene copolymer with specific molecular and structural characteristics, including a density of 875 kg/m³ or less, 60-85 mole% propylene, 5-20 mole% ethylene, and 5-30 mole% α-olefin units, which serves as a viscosity modifier to enhance low-temperature properties and fuel efficiency at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polymer is used to decrease low-temperature viscosity, then low-temperature properties are improved, but high-temperature fuel efficiency is not sufficiently improved
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters of the propylene copolymer, specifically setting the propylene content to 60-85 mole%, ethylene content to 5-20 mole%, and α-olefin content to 5-30 mole%. This specific compositional parameter range enables the polymer to achieve both low-temperature fluidity and high-temperature viscosity retention, resolving the contradiction between low-temperature properties and high-temperature fuel efficiency
Solution Approach 2:
The patent uses a composite copolymer structure combining three types of monomer units (propylene, ethylene, and α-olefin) in specific proportions. This composite material approach allows the polymer to exhibit dual characteristics: low-temperature flexibility from the copolymer structure and high-temperature viscosity stability from the controlled composition, thereby improving both low-temperature properties and high-temperature fuel efficiency simultaneously
2Loss of energy
If viscosity is lowered to reduce agitation loss, then fuel efficiency is improved, but abrasion resistance at sliding parts deteriorates
Solution Approach 1:
The patent applies dynamics by designing a polymer that dynamically adapts its viscosity characteristics based on temperature conditions. The propylene copolymer with specific composition (60-85 mole% propylene, 5-20 mole% ethylene, 5-30 mole% α-olefin) provides low viscosity at low temperatures to reduce agitation loss, while maintaining appropriate viscosity at high temperatures to ensure abrasion resistance at sliding parts
Solution Approach 2:
The patent changes the viscosity parameter dynamically through temperature-dependent behavior of the specifically composed propylene copolymer. By controlling the polymer composition within specific ranges, the oil achieves optimal viscosity at different temperatures, reducing agitation loss at low temperatures while maintaining protective film strength at high temperatures
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 propylene copolymer-based composition provides superior low-temperature properties and fuel efficiency at high temperatures, reducing viscosity resistance and improving shear stability, thereby enhancing the overall performance of lubricating oils.
Implementation Method 1
a certain kind of polymer which is soluble in a lubricating oil base is used in lubricating oil as a viscosity modifier
Implementation Method 2
the polymer dissolves in base oil and provides excellent thickening properties at a high temperature, while the solubility of the polymer in oil is decreased at a low temperature, and thereby its effective volume (flow volume) and impact on viscosity are decreased
Data Source
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AI summary
It is an object to provide a lubricating oil composition having low-temperature properties and fuel efficiency at high temperatures which are superior to those of conventional lubricating oil compositions, and to provide a viscosity modifier for lubricating oils and an additive composition for lubricating oils which are used for obtaining said composition. The viscosity modifier for lubricating oils of the present invention comprises a propylene copolymer (A) which has a density of 875kg/m3 or less and which comprises 60mole% or more of structural unit derived from propyl- ene.