Polymeric-Inorganic Heat Transfer Fluids for Stable Nanoparticle Dispersion

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Solution Overview

Problem

Existing heat transfer fluids face challenges in maintaining stable dispersion of nanoparticles in hydrophobic media, leading to agglomeration and ineffective heat transfer in electrical equipment.

Innovation Solution

A polymeric-inorganic nanoparticle composition is developed by combining inorganic nanoparticles with specific polymers, formulated through a controlled weight ratio and milling process, to enhance stability and heat transfer performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If untreated inorganic nanoparticles are used in heat transfer fluids, then thermal conductivity is improved, but nanoparticle stability deteriorates due to agglomeration in hydrophobic media

Engineering Contradiction:

Improvethermal conductivityVSAvoidnanoparticle stability

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The patent applies composite materials by combining inorganic nanoparticles with organic polymers to form a polymeric-inorganic nanoparticle composition. The polymer matrix (made from functional monomers and alkyl (meth)acrylate monomers) encapsulates the inorganic nanoparticles, creating a stable composite that prevents agglomeration while maintaining thermal conductivity enhancement in hydrophobic heat transfer fluids

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent uses organic polymers as an intermediary substance between the inorganic nanoparticles and the hydrophobic heat transfer fluid. This polymer intermediary prevents direct contact and agglomeration of hydrophilic nanoparticles in hydrophobic media, while still allowing thermal energy transfer, thus resolving the stability-conductivity contradiction

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If nanoparticle concentration is increased to improve heat transfer, then thermal conductivity is enhanced, but viscosity increases causing pressure losses

Engineering Contradiction:

Improveheat transfer performanceVSAvoidpressure losses

Core Design Contradiction:

TemperatureVSLoss of energy

Solution Approach 1:

The patent changes the physical-chemical parameters of the heat transfer fluid by incorporating polymeric-inorganic nanoparticle compositions with controlled particle sizes (1-100 nm) and polymer molecular weights. This allows optimization of the balance between thermal conductivity enhancement and viscosity control, reducing pressure losses while maintaining effective heat transfer performance

Inventive Principle:

Principle #35Parameter changes

3Temperature

If hydrophilic nanoparticles are used, then thermal properties are improved, but compatibility with hydrophobic media deteriorates

Engineering Contradiction:

Improvethermal propertiesVSAvoidcompatibility with hydrophobic media

Core Design Contradiction:

TemperatureVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by creating nanoparticles with differentiated surface properties - the core maintains hydrophilic inorganic material for thermal conductivity, while the polymer coating provides hydrophobic compatibility. This local differentiation allows the nanoparticle to simultaneously achieve thermal performance and media compatibility

Inventive Principle:

Principle #3Local quality

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 achieves enhanced heat transfer and thermal conductivity with improved nanoparticle dispersion, providing good tribological properties and avoiding copper corrosion in electrical equipment.

Implementation Method 1

The polymeric-inorganic nanoparticle composition enhances heat transfer and thermal conductivity

Methodology Applied

Scientific EffectThermal conductivity: Conduction (thermal)

Implementation Method 2

the nanoparticles are dispersed within a polymer matrix using specific functional monomers and alkyl (meth)acrylate monomers, creating a stable dispersion that maintains thermal conductivity and prevents agglomeration

Methodology Applied

Scientific EffectSteric stabilization:

Implementation Method 3

A polymeric-inorganic nanoparticle composition is developed by milling a mixture of inorganic nanoparticles and polymers

Methodology Applied

Scientific EffectMechanical dispersion:

Data Source

PatentUS12606729B2Use of polymeric-inorganic nanoparticle compositions as heat transfer fluids in battery or other electrical equipment systems

Publication Date: 2026.04.21 EVONIK OPERATIONS GMBH

AI summary

The invention relates to the use of a polymeric-inorganic nanoparticle composition as a heat transfer fluid in battery or other electrical equipment systems. The electrical equipment can be in particular electric batteries, electric motors, electric vehicle transmissions, electric transformers, electric capacitors, fluid-filled transmission lines, fluid-filled power cables, computers and power electronics such as electric power converters.