Segmented Copolymer Coating for Ice and Debris Rejection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current coatings for aircraft and aerospace surfaces fail to effectively reduce insect debris and ice adhesion, leading to increased drag, fuel consumption, and aesthetic issues, with existing solutions either being impractical or lacking durability and long-term performance.
Innovation Solution
Development of an anti-fouling segmented copolymer composition comprising fluoropolymers, polyesters or polyethers, isocyanate species, and a liquid additive, which microphase-separates to create regions for improved lubricity and ice suppression, incorporating a freezing-point depressant or lubricant to enhance debris and ice rejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sacrificial oils or greases are used to reduce ice adhesion, then ice adhesion reduction is improved, but useful lifetime deteriorates and requires regular reapplication
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by incorporating fluorinated polyurethane with specific molecular weight ranges (5,000-50,000) and fluorine content (5-20 wt%), along with silicone modifiers (0.1-5 wt%), to achieve both low ice adhesion and improved durability compared to traditional sacrificial oils
Solution Approach 2:
The patent creates a composite coating system combining fluorinated polyurethane base resin with silicone modifiers and specific curing agents, forming a multi-component system that provides synergistic effects for both anti-icing performance and long-term durability on aircraft surfaces
2Reliability
If low-energy polymers are used for non-stick coatings, then material release is improved, but lubricated surface for debris clearance deteriorates
Solution Approach 1:
The patent applies local quality by creating a coating with gradient properties - the fluorinated polyurethane provides low surface energy for non-stick performance at the surface, while the silicone modifier and polyol components provide lubricating properties in the near-surface region to facilitate debris clearance, with each component concentrated in specific regions of the coating structure
3Duration of action of stationary object
If durable coatings are applied to aircraft surfaces, then coating durability is improved, but anti-fouling performance deteriorates
Solution Approach 1:
The patent optimizes specific parameter ranges including fluorine content (5-20 wt%), molecular weight (5,000-50,000), and silicone modifier concentration (0.1-5 wt%) to achieve the optimal balance where the coating maintains durable adhesion to aircraft surfaces while simultaneously providing effective anti-fouling and icephobic performance
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 a durable, self-cleaning surface that reduces insect debris and ice adhesion, improving airflow and fuel efficiency while maintaining aesthetic appeal, with enhanced lubricity and ice suppression capabilities.
Implementation Method 1
a liquid additive disposed in the first soft segments and/or the second soft segments
Implementation Method 2
the liquid additive is a freezing-point depressant for water
Implementation Method 3
they do not necessarily provide a lubricated surface to promote clearance of foreign substances
Data Source
AI summary
This disclosure describes incorporation of a liquid additive within one or more phases of a multiphase polymer coating. The structure of the microphase-separated network provides reservoirs for liquid in discrete and/or continuous phases. Some variations provide an anti-fouling segmented copolymer composition comprising: (a) one or more first soft segments selected from fluoropolymers; (b) one or more second soft segments selected from polyesters or polyethers; (c) one or more isocyanate species; (d) one or more polyol or polyamine chain extenders or crosslinkers; and (e) a liquid additive disposed in the first soft segments and/or the second soft segments. The first soft segments and the second soft segments are microphase-separated on a microphase-separation length scale from 0.1 microns to 500 microns. These solid/liquid hybrid materials improve physical properties associated with the coating in applications such as anti-fouling (e.g., anti-ice or anti-bug) surfaces, ion conduction, and corrosion resistance.