Esterified Copolymer Hydraulic Fluid for Deposit Control and Demulsibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dispersant viscosity index improvers used in hydraulic fluids negatively impact the ability of the fluid to demulsify water, making them unsuitable for hydraulic systems where deposit and varnish control is needed while maintaining demulsibility.
Innovation Solution
A hydraulic fluid containing an esterified copolymer with units derived from a vinyl aromatic monomer and a carboxylic acid monomer, providing nitrogen functionality and good water demulsibility performance, is developed to serve as both a dispersant and viscosity modifier, avoiding the use of polyacrylates and polymethacrylates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional dispersant viscosity index improvers (polyacrylates, polymethacrylates) are used in hydraulic fluids, then deposit and varnish control is improved, but water demulsification ability deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the viscosity index improver by using esterified copolymers with specific monomer compositions (vinyl aromatic and carboxylic acid monomers) instead of conventional polyacrylates. This structural parameter change enables the additive to provide deposit control while maintaining water demulsification ability, resolving the contradiction between these two functions.
Solution Approach 2:
The patent employs composite material structure by creating copolymers that combine multiple monomer types (vinyl aromatic monomers and carboxylic acid monomers) in a single polymer chain. This composite approach allows the additive to simultaneously exhibit both dispersant properties (for deposit control) and demulsifier properties, eliminating the need to choose between conflicting functions.
2Object-generated harmful factors
If dispersant VI improvers are incorporated to mitigate deposits and varnish, then deposit control is improved, but the ability to separate water deteriorates
Solution Approach 1:
The patent develops viscosity index improvers that perform multiple functions simultaneously: they act as dispersants to control deposits and varnish, while also functioning as demulsifiers to separate water. The esterified copolymer structure with nitrogen functionality provides both deposit control and water separation capabilities in a single additive, eliminating the trade-off between these functions.
3Stability of the object's composition
If polyalkyl(meth)acrylates are used as VI improvers, then high viscosity index and low temperature flow are improved, but water demulsification is compromised
Solution Approach 1:
The patent modifies the chemical composition parameters of the VI improver by replacing polyalkyl(meth)acrylates with esterified copolymers containing vinyl aromatic and carboxylic acid monomers. This parameter change maintains the viscosity index improvement and low temperature flow characteristics while restoring water demulsification ability, resolving the contradiction between lubrication performance and water separation.
Data Source
AI summary
A hydraulic fluid includes an oil of lubricating viscosity and at least 2 wt. % of an ester of a carboxy group-containing interpolymer comprising units derived from a vinyl aromatic monomer and units derived from a carboxylic acid monomer. The interpolymer also contains nitrogen functionality. The hydraulic fluid is at least substantially free of polyacrylates and polymethacrylates.