Comb Copolymer Lubricant Viscosity Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High molar mass polymers used in lubricating compositions exhibit irreversible degradation under mechanical stress, leading to a decline in viscosity and poor lubrication properties due to low shear strength, especially in high-temperature and cycling conditions, which affects their stability and effectiveness in applications like internal combustion engines.
Innovation Solution
A comb copolymer comprising at least two boronic ester functional groups, combined with a polydiol compound, which forms a composition that thickens with temperature increases and retains stability, reducing viscosity sensitivity and enhancing lubrication properties by forming thermoreversible associations and incorporating oligomeric side chains for improved viscosity modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high molar mass polymers are used to increase viscosity, then viscosity improvement is achieved, but irreversible degradation under mechanical stress occurs leading to loss of thickening properties
Solution Approach 1:
The patent changes the molecular architecture parameter from linear to comb structure, where side chains are attached to a backbone. This structural parameter change allows the polymer to maintain viscosity while resisting mechanical degradation, as the comb structure distributes stress more effectively throughout the molecule.
Solution Approach 2:
The patent creates a composite polymer structure combining a backbone with multiple side chains (comb architecture). This composite structure integrates the benefits of both the backbone (providing strength) and side chains (providing viscosity), resolving the contradiction between viscosity and mechanical stability.
2Reliability
If high molar mass polymers are used to enhance lubrication properties, then lubrication performance improves, but shear strength decreases leading to irreversible degradation
Solution Approach 1:
The patent changes the polymer architecture from linear to comb structure, which fundamentally alters how the polymer responds to shear stress. The comb structure provides higher shear strength while maintaining lubrication properties, resolving the contradiction between lubrication performance and shear strength.
3Stability of the object's composition
If polymer compositions are used to control viscosity, then viscosity stability improves, but the compositions become sensitive to temperature variations
Solution Approach 1:
The patent changes the thermal response parameter of the polymer composition by introducing comb architecture with specific side chains. This structural change modifies the temperature-viscosity relationship, reducing sensitivity while maintaining stability across a range of 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 composition provides stable lubrication properties across varying temperatures, maintaining viscosity and reducing wear between moving parts, even under high shear stresses, thus enhancing the performance and longevity of lubricating compositions.
Implementation Method 1
These compounds can associate, to possibly form a gel, and exchange chemical bonds in a thermoreversible way
Implementation Method 2
These copolymers, when they are introduced into a base oil, tend to reduce the drop in viscosity of the mixture when the temperature increases
Data Source
AI summary
A comb copolymer A2 including at least two boronic ester functions, the copolymer including a main chain and side chains, and at least one portion of the side chains of the copolymer A2 made of oligomers. Also, a composition resulting from mixing at least one polydiol compound A1 and a copolymer A2. The compositions exhibit very varied rheological properties depending on the proportion of the compounds A1 and A2 used. Also, a lubricant composition including such a mixture and at least one lubricating oil. Also, use of this composition to lubricate a mechanical part.