Associative Oligomer Lubricant Viscosity Stability
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Solution Overview
Problem
Current lubricating compositions for engines face challenges in maintaining viscosity stability across temperature variations, leading to reduced lubricating properties and increased fuel consumption, due to the low resistance to shear stresses and oxidation instability of high molecular weight polymers.
Innovation Solution
A composition combining a polydiol oligomer with diol functions and a compound comprising boronic ester functions, which can form thermoreversible associations, is developed to provide improved viscosity control and resistance to mechanical degradation, maintaining lubricating properties across temperature changes and reducing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high molecular weight polymers are used to increase viscosity, then viscosity stability is improved, but resistance to shear stresses deteriorates
Solution Approach 1:
The patent combines two different polymer components: polydiol oligomers (lower molecular weight, high shear resistance) and polyboronic ester compounds (viscosity stabilizing). This composite approach allows the lubricating composition to achieve both viscosity stability across temperature ranges and resistance to shear stresses, resolving the contradiction between these two properties.
Solution Approach 2:
The patent changes the molecular weight parameters of the polymer components. Instead of using only high molecular weight polymers, it employs polydiol oligomers with controlled lower molecular weight (600-10,000 g/mol) that maintain shear resistance while still providing viscosity stability when combined with polyboronic ester compounds.
2Reliability
If high molecular weight polymers are used to maintain viscosity, then lubricating properties are improved, but fuel consumption increases
Solution Approach 1:
The patent optimizes the molecular weight parameters of the polymer components to achieve the minimum effective viscosity for lubrication. By using polydiol oligomers with controlled lower molecular weight combined with polyboronic ester compounds, the composition maintains adequate lubricating properties while reducing viscosity-related energy losses and fuel consumption.
Solution Approach 2:
The patent creates different functional zones within the lubricating composition: polydiol oligomers provide shear resistance and base viscosity, while polyboronic ester compounds provide temperature-dependent viscosity stability. This local functional differentiation allows efficient lubrication with reduced energy consumption.
3Stability of the object's composition
If high molecular weight polymers are used to increase viscosity, then viscosity control is improved, but resistance to oxidation deteriorates
Solution Approach 1:
The patent creates a composite system where polydiol oligomers provide controlled viscosity with lower molecular weight (reducing oxidation susceptibility) and polyboronic ester compounds provide temperature-dependent viscosity stability. The combination achieves viscosity control without the oxidation penalties of high molecular weight polymers.
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 new composition achieves stable viscosity and enhanced lubricating performance over time, with improved resistance to mechanical degradation and fuel efficiency, by forming thermoreversible associations and retaining thickening properties at high temperatures.
Implementation Method 1
These compounds can associate, potentially forming a gel, and exchange chemical bonds in a thermoreversible manner
Implementation Method 2
They reduce friction and wear between two parts in contact and moving relative to each other. They also help dissipate some of the heat energy generated by this friction
Data Source
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AI summary
Disclosed are compositions obtained by mixing at least one oligomer A1, which is obtained by copolymerizing at least two monomers functionalized by diol functions with at least one second monomer, with at least one compound A2 having at least two boron ester functions. The compositions exhibit very varied rheological properties depending on the proportion of the compounds A1 and A2 used. The invention also relates to a composition obtained by mixing at least one lubricating oil with such a composition of associative and exchangeable polymers, and the use of this composition to lubricate a mechanical part.