Ice-Delay Coating with Hydrophobic Particles

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Solution Overview

Problem

Current methods for preventing ice formation on aircraft surfaces, such as hot glycol sprays and energy-consuming de-icing systems, are costly, energy-intensive, and environmentally impactful, and they do not provide long-lasting solutions for ice delay in multiple freeze cycles.

Innovation Solution

A coating composition with a cross-linked polymer matrix containing first, second, and third particles, where the second particles are polytetrafluoroethylene and the third particles are calcium silicate or iron oxides, which are homogeneously distributed to create a surface with a water contact angle greater than 90°, delaying ice formation without external energy input.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hot glycol sprays are used for de-icing, then ice removal is effective, but operational time increases and additional expense is generated

Engineering Contradiction:

Improveice removal effectivenessVSAvoidapplication time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The coating is applied in advance to aircraft surfaces before flight operations. This preliminary action creates a protective layer that passively delays ice formation during multiple freeze-thaw cycles, eliminating the need for time-consuming de-icing operations at the gate while maintaining effective ice protection throughout the flight schedule

Inventive Principle:

Principle #10Preliminary action

2Reliability

If de-icing systems are applied, then ice protection is achieved, but energy consumption increases

Engineering Contradiction:

Improveice protectionVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The coating performs ice protection functions passively without requiring external energy input. The hydrophobic and ice-phobic properties of the coating materials enable automatic ice shedding and prevention through surface tension and thermal insulation, allowing the coating to serve itself and eliminate dependence on energy-consuming heating or mechanical de-icing systems

Inventive Principle:

Principle #25Self-service

3Reliability

If de-icing fluids are used, then ice removal is effective, but environmental impact increases

Engineering Contradiction:

Improveice removal effectivenessVSAvoidenvironmental impact

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The coating uses environmentally benign materials such as hydrophobic nanoparticles and ice-phobic polymers that replace harmful de-icing fluids. These materials provide durable ice protection through physical and chemical properties rather than through fluid application, eliminating the need for repeated fluid applications and their associated environmental contamination

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Reliability

If conventional coatings are applied, then surface protection is provided, but ice formation delay property is insufficient

Engineering Contradiction:

Improvesurface protectionVSAvoidice formation delay duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The coating combines multiple materials with complementary properties: hydrophobic nanoparticles (such as silica or fluorinated particles) that repel water, ice-phobic polymers that inhibit ice adhesion, and thermally insulating fillers that reduce heat transfer. This composite structure creates synergistic effects that provide both durable surface protection and extended ice formation delay across multiple freeze-thaw cycles

Inventive Principle:

Principle #40Composite materials

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 coating effectively delays ice formation over multiple freeze cycles, reducing the need for de-icing fluids and energy consumption, while maintaining durability and toughness, even after abrasion, thus enhancing aircraft fuel efficiency and reducing environmental impact.

Implementation Method 1

The outer surface exhibits a water contact angle greater than 90°

Methodology Applied

Scientific EffectHydrophobic effect: Hydrophobe

Implementation Method 2

exhibits a property of delaying ice formation compared to the coating layer without the first particles

Methodology Applied

Scientific EffectIcephobic effect:

Data Source

PatentUS10584260B2Coatings, coating compositions, and methods of delaying ice formation

Publication Date: 2020.03.10 THE BOEING CO

AI summary

A coating includes at least one coating layer containing first particles, second particles, and third particles distributed throughout a cross-linked, continuous polymer matrix. An outer surface of the coating layer includes surfaces of at least first particles extending outward from a top periphery of the polymer matrix. The outer surface exhibits a property of delaying ice formation compared to the coating layer without the first particles. A method includes applying a coating composition in one application step. The one-step coating composition contains first particles, second particles, and third particles in a base containing a polymer. A coating composition includes first particles, second particles, and third particles distributed in a matrix precursor.