Fluorinated Alkyl Ether Epoxy Resin Coatings for Aircraft Drag Reduction
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Solution Overview
Problem
Current coatings fail to maintain laminar flow on aircraft surfaces by allowing insect residue and ice adhesion, leading to increased drag and fuel inefficiency, while modifying polymeric materials for low surface energy often compromises mechanical, thermal, and optical properties.
Innovation Solution
Development of fluorinated alkyl ether epoxy resin compositions that react with amino terminated perfluorinated alkyl ether polymers to achieve low surface energy while maintaining bulk mechanical, thermal, and optical properties, allowing for effective adhesion to substrates while minimizing adhesion of biological and organic contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluorinated modifiers are added to polymeric materials to achieve low surface energy, then surface adhesion of contaminants is reduced, but bulk mechanical and thermal properties deteriorate
Solution Approach 1:
The patent applies local quality by creating a chemically anisotropic polymer matrix where fluorinated alkyl ether segments are concentrated at the surface region while the bulk maintains its original mechanical properties. This spatial differentiation allows the surface to exhibit low adhesion to contaminants while the bulk provides structural strength.
Solution Approach 2:
The invention creates a composite polymer system combining fluorinated alkyl ether modified epoxy resin with unmodified epoxy resin. This composite structure allows the fluorinated component to migrate to the surface and provide low surface energy, while the unmodified epoxy bulk maintains mechanical integrity.
2Object-affected harmful factors
If fluorinated modifiers are well dispersed within the polymer matrix to achieve desired surface modification, then surface energy is reduced, but the modifier is contained within the interior and does not contribute to surface modification
Solution Approach 1:
The patent employs dynamic segregation where the fluorinated alkyl ether segments are not statically distributed but dynamically migrate to the surface during curing and service. This dynamic behavior ensures that the modifier concentrates at the surface where it is needed for low adhesion properties.
Solution Approach 2:
The invention utilizes parameter changes in the polymer matrix during curing, where temperature and compositional changes drive the fluorinated segments to migrate from the bulk to the surface. This parameter-driven migration ensures effective surface modification.
3Object-affected harmful factors
If conventional coatings are applied to aircraft surfaces to reduce adhesion, then surface energy is reduced, but adhesion to substrate is compromised
Solution Approach 1:
The patent creates local quality differentiation within the coating where the fluorinated segments are concentrated at the outer surface to provide low adhesion to contaminants, while the inner regions maintain strong adhesion to the substrate through the epoxy matrix.
Solution Approach 2:
The invention creates a composite coating structure where fluorinated alkyl ether modified epoxy provides surface low energy properties while the epoxy matrix ensures substrate adhesion, combining both requirements in a single integrated system.
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 fluorinated alkyl ether epoxy resin compositions exhibit outstanding adhesion to various substrates while resisting the adhesion of contaminants, providing a unique combination of properties suitable for aerospace and other applications requiring low surface energy and high mechanical strength.
Implementation Method 1
achieve low surface energy while maintaining bulk mechanical, thermal, and optical properties
Implementation Method 2
the fluorine-containing segments of the ATPAE are available to migrate to the exterior surface of the epoxy resin during cure
Implementation Method 3
The amino end groups of the ATPAE can react with the epoxide groups
Data Source
AI summary
Epoxy resin compositions prepared using amino terminated fluoro alkyl ethers. The epoxy resin compositions exhibit low surface adhesion properties making them useful as coatings, paints, moldings, adhesives, and fiber reinforced composites.