Aircraft Component Fluid Barrier Coating for Low-Volatile Adhesion

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Solution Overview

Problem

Existing fluid barriers for aircraft components are time-consuming, labor-intensive, and costly to repair or refurbish, and they allow fluid ingress, compromising the integrity of composite materials and creating bubbles or deformities.

Innovation Solution

A method involving blast media cleaning, controlled heating, solvent treatment, and application of primer and topcoat layers using polyurea or polysulfide materials to form a robust fluid barrier that adheres to the three-dimensional structure of components, reducing volatile content and improving adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional fluid barrier formation methods are used, then the component is protected from debris, but the process is time-consuming and labor-intensive

Engineering Contradiction:

Improvefluid barrier protectionVSAvoidrefurbishment speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies parameter changes by controlling the temperature of the component and primer coating material within specific ranges (component temperature from about 120°F to about 140°F, primer temperature from room temperature to about 140°F) and maintaining specific viscosity ranges (1500-3300 centipoise) to optimize the fluid barrier formation process, reducing cure time while ensuring proper adhesion and protection

Inventive Principle:

Principle #35Parameter changes

2Reliability

If traditional fluid barrier materials are used, then the component is protected, but volatile content creates bubbles and deformities

Engineering Contradiction:

Improvefluid barrier integrityVSAvoidvolatile content

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent addresses volatile content by controlling the temperature and viscosity parameters of the primer coating material, heating it to reduce viscosity to the optimal range of 1500-3300 centipoise, which facilitates proper application and reduces trapped volatiles that cause bubbles and deformities in the cured fluid barrier

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces traditional high-volatile coating materials with a chemically modified primer coating system that cures through a controlled chemical reaction at lower temperatures, substituting the need for high-temperature curing that traps volatiles, thereby eliminating bubbles and deformities

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Duration of action of stationary object

If multiple refurbishment cycles are performed, then the component lifecycle is extended, but cost and time increase significantly

Engineering Contradiction:

Improvecomponent lifecycleVSAvoidrefurbishment time

Core Design Contradiction:

Duration of action of stationary objectVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing thorough surface preparation including blast media cleaning and solvent cleaning before applying the primer coating, ensuring optimal adhesion from the start. This preliminary preparation prevents future failures and reduces the need for repeated refurbishment cycles, extending component lifecycle while minimizing total time investment

Inventive Principle:

Principle #10Preliminary action

4Reliability

If traditional cleaning and coating methods are used, then the surface is prepared, but adhesion is insufficient

Engineering Contradiction:

Improvecoating adhesionVSAvoidcoating process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent achieves improved adhesion by controlling specific parameters: heating the component to 120-140°F, maintaining primer temperature from room temperature to 140°F, and controlling primer viscosity to 1500-3300 centipoise. These parameter optimizations ensure proper flow, penetration, and bonding without requiring excessively complex preparation procedures

Inventive Principle:

Principle #35Parameter changes

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 method results in a more durable fluid barrier with reduced volatile content, improved adhesion, and enhanced resistance to fluid ingress, preserving the integrity of aircraft components while being more environmentally friendly and cost-effective.

Implementation Method 1

cleaning, using a blast media, a first side of a component

Methodology Applied

Scientific EffectAbrasion: Abrasion

Implementation Method 2

heating the component to a first temperature

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 3

cleaning the component using a solvent

Methodology Applied

Scientific EffectSolvation: Solvation

Implementation Method 4

forming a primer coating layer on the first side of the component

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS12358018B2Systems and methods of forming a fluid barrier

Publication Date: 2025.07.15 THE BOEING CO

AI summary

The present disclosure provides fluid barriers as well as systems and methods of forming fluid barriers. The method includes cleaning, via a blast media, a first side of a component and heating the component to a first temperature. Subsequently, the component is cleaned using a solvent. Subsequent to heating at least the component, a primer coating layer is formed on the first side of the component, and a topcoat layer is formed in contact with the primer coating layer. A primer coating material can be heated to a second temperature prior to formation of the primer coating layer. The first temperature can be different than the second temperature.