High-Solids Peelable Coating for Aircraft Chemical Milling
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Solution Overview
Problem
Current coating compositions for chemical milling processes have high organic solvent content, leading to toxic emissions and increased fire risk, are time-consuming and costly to apply, and result in quality defects like pinholes and bubbles, with poor storage stability and infiltration issues.
Innovation Solution
A coating composition with a high solids content (>95% by weight) comprising a binder component including polyether polyol, aromatic diamine, silicone elastomer particles, and polyurethaneurea, and a hardener component with unblocked isocyanate groups, which reduces solvent usage and improves chemical resistance and visibility of blade cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional coating compositions with high organic solvent content are used, then the coating can be applied easily, but significant toxic emissions and increased fire risk occur
Solution Approach 1:
The patent fundamentally changes the composition parameters of the coating by reducing organic solvent content from typical high levels (60-80%) to minimal levels (5-20%), while compensating with high solids content (80-95%). This parameter transformation maintains coating applicability while dramatically reducing toxic emissions and fire hazards associated with conventional solvent-based coatings
Solution Approach 2:
The invention discards the harmful organic solvent component from the coating formulation, eliminating the source of toxic emissions and fire risk. The coating achieves its functional properties through high solids content comprising reactive polymers and crosslinking agents rather than relying on volatile organic solvents
2Manufacturing precision
If multi-stage application process is used to achieve necessary layer thickness, then adequate coating thickness is obtained, but the process becomes very time-consuming and cost-intensive
Solution Approach 1:
The patent merges multiple coating application stages into a single-stage process. The high solids content formulation (80-95%) enables achieving the required coating thickness and protective functionality in one application, eliminating the need for multiple coating and drying cycles that characterize conventional low-solids coatings
Solution Approach 2:
By changing the solids content parameter to very high levels (80-95%), the coating achieves sufficient thickness and protective properties in a single application layer, eliminating the need for multi-stage application processes required by conventional coatings with lower solids content
3Ease of manufacture
If conventional coating compositions are used, then the coating can be applied, but pinholes, paint boils and bubbles occur resulting in inadequate substrate protection
Solution Approach 1:
The patent employs a composite coating formulation combining reactive polymers (epoxy, polyester, vinyl esters) with crosslinking agents and silane-containing compounds. This composite material structure creates a dense, defect-free coating matrix that eliminates pinholes, bubbles, and paint boils while providing reliable substrate protection during chemical milling
Solution Approach 2:
The invention changes the compositional parameters by eliminating organic solvents and using high solids content (80-95%) with reactive polymers and crosslinking agents. This parameter transformation produces a homogeneous coating without the defects (pinholes, bubbles) that occur in conventional solvent-based coatings, ensuring adequate substrate protection
4Reliability
If coatings with high filler content are used to achieve necessary properties, then the coating can be formulated, but storage stability is severely impaired
Solution Approach 1:
The patent uses a composite formulation of reactive polymers (epoxy, polyester, vinyl esters) combined with crosslinking agents and silane-containing compounds. This composite material system achieves the required coating performance and chemical resistance without relying on high filler content, thereby maintaining excellent storage stability
Solution Approach 2:
The invention changes the formulation parameters by using high solids content (80-95%) of reactive polymers and crosslinking agents instead of high filler content. This parameter transformation maintains coating performance and chemical resistance while preserving storage stability that would be severely impaired by high filler formulations
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 enables a single-stage application process with reduced solvent emissions, improved substrate protection, enhanced storage stability, and minimized infiltration, facilitating the merging of cut edges and ensuring adequate protection during chemical milling.
Implementation Method 1
the hardener component B containing, B1 at least one component containing urethane groups containing unblocked isocyanate groups
Implementation Method 2
a coating composition with a high solids content (>95% by weight) comprising a binder component including polyether polyol, aromatic diamine, silicone elastomer particles, and polyurethaneurea, and a hardener component with unblocked isocyanate groups
Data Source
AI summary
The invention relates to peelable and chemically-resistant coatings for metal and plastic substrates, and to the coating agent compositions required to produce same. The invention also relates to a method for producing such coatings and to the use of the coating agent compositions to protectively coat metal and plastic substrates in the field of aircraft construction.