Silicate Heat-Transfer Fluids with Aromatic Polyacids

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Solution Overview

Problem

Existing heat-transfer fluids for heavy-duty engines rely on borates and nitrites for corrosion inhibition, which pose health and environmental hazards, necessitating the development of alternative inorganic silicate-based fluids that reduce or eliminate these additives while maintaining effective corrosion protection and extending service life.

Innovation Solution

Formulating silicate-based heat-transfer fluids that include an aromatic polyacid, which provides enhanced corrosion inhibition for both aluminum and ferrous alloys, allowing for reduced or eliminated use of borates and nitrites, and extending the service life of the fluids.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If borates and nitrites are used for corrosion inhibition, then corrosion protection for ferrous alloys is improved, but health and environmental hazards increase

Engineering Contradiction:

Improvecorrosion protectionVSAvoidhealth and environmental hazards

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention extracts and eliminates the harmful additives (borates and nitrites) from the heat-transfer fluid formulation while retaining the essential corrosion protection function through alternative means (silicate-based system with aromatic polyacid), directly resolving the contradiction between effectiveness and environmental safety

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the chemical composition parameters of the corrosion inhibition system by replacing borate/nitrite-based chemistry with silicate-aromatic polyacid chemistry, thereby maintaining protective functionality while eliminating toxic effects

Inventive Principle:

Principle #35Parameter changes

2Reliability

If borates and nitrites are used for corrosion inhibition, then corrosion protection for ferrous alloys is improved, but service life of the fluid is reduced

Engineering Contradiction:

Improvecorrosion protectionVSAvoidservice life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention replaces the conventional borate/nitrite system with a silicate-based system that, while providing comparable initial protection, extends the operational lifespan of the heat-transfer fluid, making the protective system more durable rather than disposable

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Object-affected harmful factors

If silicate-based fluids are used to eliminate borates and nitrites, then health and environmental hazards are reduced, but corrosion protection for ferrous alloys may be compromised

Engineering Contradiction:

Improvehealth and environmental hazardsVSAvoidcorrosion protection

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The invention creates a composite corrosion protection system combining silicate base fluid with aromatic polyacid additives, where the synergistic interaction between components provides both ferrous alloy and aluminum protection, resolving the contradiction between safety and effectiveness

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The silicate-based formulation with aromatic polyacid achieves multi-functional corrosion protection covering both ferrous alloys and aluminum, replacing the specialized borate/nitrite system while maintaining or improving protective scope

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 silicate-based heat-transfer fluids with aromatic polyacids demonstrate improved corrosion protection for both aluminum and ferrous alloys, achieving comparable or superior performance to fluids containing borates and nitrites, while significantly reducing their use and extending the service life of the fluids.

Implementation Method 1

an aromatic polyacid according to formula (I) or a salt thereof... exhibiting improved corrosion protection

Methodology Applied

Scientific EffectCorrosion inhibition:

Implementation Method 2

Silicates such as inorganic silicates are known corrosion inhibitors which are particularly useful for providing aluminum protection

Methodology Applied

Scientific EffectCorrosion inhibition:

Data Source

PatentEP3986974B1Silicate based heat transfer fluid, methods of its preparations and uses thereof

Publication Date: 2023.07.26 ARTECO NV

AI summary

The present invention relates to silicate based heat-transfer fluids comprising an aromatic polyacid according to formula (I) or a salt thereof. It was found that said compositions exhibit increased corrosion inhibition on both aluminum and ferrous alloy substrates compared to similar compositions comprising borate or a different aromatic acid. The invention further relates to concentrates and kits for the preparation of said silicate based heat-transfer fluids, to methods for the preparation of said silicate based heat-transfer fluids, and to the methods and uses employing said silicate based heat-transfer fluids.