Thermoplastic Coatings for Aircraft Composite Conductivity
Solution Overview
Problem
Existing coatings and sealants used in aircraft manufacturing, particularly those applied to composite and metallic materials, face challenges in efficiently dissipating electrical charges, providing adequate conductivity, and maintaining adhesion and durability while being difficult to apply to hard-to-reach areas and requiring lengthy curing times.
Innovation Solution
A thermoplastic polymer powder feedstock is used with a high-velocity sprayer to deposit coatings that can be tailored for conductivity and adhesion, eliminating the need for curing and allowing for efficient application to difficult surfaces by mixing thermoplastic polymers with conductive powders such as titanium, nickel alloy, or carbon nanotubes, which are delivered separately to achieve desired resistivity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coatings and sealants are used to provide protection and adhesion, then coating durability and protective qualities are improved, but electrical charge dissipation capability deteriorates
Solution Approach 1:
The patent applies composite materials by combining thermoplastic polymer particles with conductive particles (such as metal powders, carbon black, or graphite) to create a coating that simultaneously provides protective qualities and electrical charge dissipation. The composite formulation integrates two distinct material types to achieve both adhesion/durability and conductivity functions in a single coating layer.
2Reliability
If coatings require lengthy curing protocols or additional triggering mechanisms, then appropriate curing degree is achieved, but application time and process complexity increase
Solution Approach 1:
The patent applies parameter changes by utilizing the melting point characteristics of thermoplastic polymers. Instead of requiring chemical curing reactions, the coating relies on thermal parameters - the polymer particles melt and coalesce when exposed to heat (such as from conventional drying ovens or ambient temperature over time), forming a continuous film that adheres to the substrate. This phase change approach eliminates lengthy curing protocols while maintaining coating integrity.
3Area of stationary object
If coatings are applied to hard-to-reach areas, then complete surface coverage is achieved, but application difficulty increases
Solution Approach 1:
The patent applies pneumatics and hydraulics by utilizing spray application methods where the powdered coating material is suspended in a fluid carrier (such as air or inert gas) and delivered through spray nozzles. This pneumatic delivery system enables the coating to reach hard-to-access areas, irregular surfaces, and complex geometries that would be difficult to coat with brush or roller methods, achieving complete surface coverage while reducing application difficulty.
4Object-generated harmful factors
If conductive particles are added to achieve desired conductivity, then electrical charge dissipation is improved, but coating viscosity and application properties deteriorate
Solution Approach 1:
The patent applies segmentation by maintaining the coating as a powder formulation rather than a liquid suspension. The thermoplastic polymer particles and conductive particles remain as discrete, segmented phases that are separately controlled in composition. This segmentation allows independent optimization of each component's properties and simplifies formulation, as the powder mixture can be directly sprayed without requiring complex viscosity management that would be necessary in liquid systems containing conductive fillers.
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 solution provides coatings with tailored conductivity and adhesion, eliminating the need for curing, reducing application time, and enabling efficient application to hard-to-reach areas, while maintaining robust protective qualities and ease of handling and removal.
Implementation Method 1
a thermoplastic polymer coating is deposited onto a substrate surface
Implementation Method 2
mixing thermoplastic polymers with conductive powders such as titanium, nickel alloy, or carbon nanotubes, which are delivered separately to achieve desired resistivity levels
Data Source
AI summary
Tunable thermoplastic polymer powder feedstock formulations and tunable conductive thermoplastic polymer powder feedstock formulations are disclosed for delivery to a high-velocity sprayer are presently disclosed, along with tunable coatings made from the disclosed formulations, and methods for delivering such tunable thermoplastic polymer coatings to substrates.