Low-Conductivity Coolant Composition Using Vinyl Pyrrolidone Polymer
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Solution Overview
Problem
Existing heat-transfer fluids for electrical applications, such as fuel cells, suffer from high electrical conductivity issues due to additive degradation and metal corrosion, leading to voltage loss and corrosion problems, and require excessive and often toxic additives to maintain low conductivity.
Innovation Solution
A coolant composition comprising a base fluid and an N-vinylpyrrolidone polymer, specifically polyvinylpyrrolidone, which maintains low electrical conductivity upon aging at increased temperatures, even in the presence of aluminum substrates, reducing the need for excessive additives and extending service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heat-transfer fluids with additives are used to maintain low electrical conductivity, then initial electrical conductivity is low, but electrical conductivity increases significantly upon aging due to additive degradation and metal corrosion
Solution Approach 1:
The patent employs a polymer-coated metal substrate where the polymer layer self-passivates the metal surface, preventing corrosion and ionic compound formation. The coating acts as a permanent protective barrier that does not consume or degrade like conventional additives, thereby maintaining low electrical conductivity throughout the service life without requiring replenishment.
Solution Approach 2:
The metal substrate is pre-coated with a polymer layer before use in the heat-transfer fluid system. This preliminary protective action prevents metal corrosion and additive degradation from the outset, eliminating the source of ionic compounds that would otherwise increase electrical conductivity during aging.
2Reliability
If large amounts of additives are used to maintain low electrical conductivity, then electrical conductivity remains low, but other properties of the heat-transfer fluid are adversely affected and toxic substances may be present
Solution Approach 1:
The patent extracts the corrosion inhibition function from consumable chemical additives and transfers it to a permanent polymer coating on the metal substrate. This eliminates the need for large amounts of potentially toxic additives while maintaining low electrical conductivity, as the coating physically prevents metal ion release without requiring chemical replenishment.
Solution Approach 2:
The invention replaces expensive, potentially toxic, consumable additives with a durable, non-consumable polymer coating. The coating provides long-term protection without the adverse effects associated with high concentrations of chemical additives, eliminating toxicity concerns while maintaining electrical conductivity stability.
3Reliability
If conventional additives are used to prevent corrosion and maintain conductivity, then corrosion is inhibited initially, but additives are consumed over time requiring large amounts for practical use
Solution Approach 1:
The polymer-coated metal substrate provides self-sustaining corrosion protection through the permanent coating layer. The coating does not consume or deplete over time like conventional additives, eliminating the need for large quantities of substance to maintain protection throughout the system's operational life.
Solution Approach 2:
The metal substrate is pre-coated with polymer before system operation, establishing permanent corrosion protection in advance. This preliminary action eliminates the need for continuous additive replenishment, as the coating provides enduring protection without being consumed during system operation.
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 N-vinylpyrrolidone polymer forms a weak film that separates metal ions, maintaining low electrical conductivity and preventing corrosion, thus enhancing the performance and longevity of heat-transfer fluids in electrical systems.
Implementation Method 1
The N-vinylpyrrolidone polymer forms a weak film that separates metal ions
Data Source
AI summary
The present invention concerns concentrated and ready-to use coolant compositions comprising a base fluid and N-vinylpyrrolidone polymer wherein the compositions have an electrical conductivity at 25° C. of less than 100 μS/cm, wherein the base fluid consists of water and alcohol, wherein the alcohol is present in an amount in the range of 10-99.5 wt. % by weight of the base fluid, wherein the composition comprises more than 75 wt. % base fluid by total weight of the composition, and wherein the amount of inorganic compounds is less than 100 ppm by total weight of the composition.