Random Copolymers for Lubricant Additives
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Solution Overview
Problem
Conventional lubricant additives based on high molecular weight polymers lack shear stability and solubility in various base oils, requiring large amounts to achieve desired viscosimetric properties and often necessitate complex and costly manufacturing processes.
Innovation Solution
Development of random copolymers with a weight-average molecular weight of 5,000 to 20,000 g/mol, comprising conjugated dienes, alkyl (meth)acrylates, and esters of (meth)acrylic acid, which are hydrogenated and have a low degree of cross-linking and narrow molecular weight distribution, allowing for improved shear resistance and solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high molecular weight polymers are used as lubricant additives, then viscosimetric properties are improved, but shear stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight parameters of the polymer additives. Specifically, it uses number-average molecular weight Mn of 10,000-50,000 g/mol and weight-average molecular weight Mw of 20,000-100,000 g/mol, with polydispersity index Mw/Mn controlled at 1.05-2.0. This optimization of molecular weight parameters achieves the desired balance between viscosimetric improvement and shear stability without requiring large amounts of additive.
Solution Approach 2:
The patent employs composite materials by combining different polymer components with specific molecular weight characteristics. It uses copolymers comprising vinyl aromatic hydrocarbons and conjugated dienes, where the composite structure provides both the necessary viscosity improvement and enhanced shear resistance through the synergistic effect of different monomer units.
2Quantity of substance
If high molecular weight polymers are used as lubricant additives, then viscosimetric properties are improved, but solubility in base oils deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the molecular weight distribution parameters, specifically maintaining polydispersity index Mw/Mn between 1.05-2.0. This narrow distribution ensures better solubility in various base oils while still providing adequate viscosimetric improvement. The controlled molecular weight parameters prevent excessive polymer aggregation that would reduce solubility.
Solution Approach 2:
The patent applies local quality by ensuring uniform distribution of polymer chains with controlled molecular weight throughout the lubricant composition. The specific molecular weight range and narrow polydispersity create locally optimized segments that maintain compatibility with different base oil types, improving overall solubility and adaptability.
3Quantity of substance
If large amounts of polymeric additives are used, then desired viscosimetric properties are achieved, but manufacturing cost increases
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight parameters to achieve maximum viscosimetric efficiency at minimum additive concentration. The specific range of Mn (10,000-50,000 g/mol) and Mw (20,000-100,000 g/mol) with controlled polydispersity (1.05-2.0) provides optimal thickening efficiency, reducing the required additive dosage and thereby lowering manufacturing costs.
Solution Approach 2:
The patent applies copying by using commercially available polymer components that replicate the desired performance characteristics without requiring complex custom synthesis. The copolymers of vinyl aromatic hydrocarbons and conjugated dienes can be produced through established industrial processes, avoiding the need for expensive proprietary manufacturing while achieving the required viscosimetric properties.
4Reliability
If complex manufacturing processes are used, then polymer performance is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent applies parameter changes by specifying precise molecular weight parameters (Mn: 10,000-50,000 g/mol, Mw: 20,000-100,000 g/mol, Mw/Mn: 1.05-2.0) that can be achieved through conventional polymerization processes. These parameter specifications guide manufacturers to use standard industrial techniques rather than complex specialized processes, maintaining ease of manufacture while ensuring consistent polymer performance.
Solution Approach 2:
The patent applies copying by utilizing commercially available copolymer components that can be obtained through established manufacturing routes. The copolymers of vinyl aromatic hydrocarbons and conjugated dienes are produced using well-known polymerization methods, allowing manufacturers to source ready-made materials without investing in complex synthesis facilities or processes.
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 provide enhanced viscosimetric properties at lower concentrations, exhibit high shear stability, and are easily producible on an industrial scale using commercially available components, ensuring excellent filterability and low foam formation in lubricant compositions.
Implementation Method 1
the monomer units derived from the conjugated dienes are hydrogenated
Data Source
AI summary
The invention relates to random copolymers comprising monomers derived from conjugated dienes and alkyl (meth)acrylates, a method for manufacturing the copolymers, lubricant compositions comprising the copolymers, and the use of the copolymers as additives for lubricant compositions or as a base oil for lubricant compositions. The copolymers are favorably used for driving system lubricating oils, hydraulic oils, engine oils and industrial oil formulations.