Transparent Icephobic Coating Composition for Durable Low Ice Adhesion
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Solution Overview
Problem
Existing coatings fail to provide adequate long-term durability and ice adhesion reduction in various environments, including mechanical durability and ice adhesion reduction, and are not transparent.
Innovation Solution
A method of forming a transparent icephobic coating by combining a low-surface-energy polymer with a hygroscopic material, using high-shear and/or sonication processing to create a microstructured coating with phase inhomogeneity between 10 nanometers to 10 microns, and curing it on a substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If durable coatings such as thermoplastic elastomers are used, then long-term durability is improved, but ice adhesion reduction is worsened (no benefit in lowering ice adhesion)
Solution Approach 1:
The patent employs composite materials by combining thermoplastic elastomer polymers with fluorinated compounds and silicone compounds. This composite approach allows the coating to simultaneously achieve durable adhesion (from the thermoplastic elastomer matrix) and icephobic properties (from the fluorinated and silicone additives that reduce surface energy and create low-adhesion surface characteristics).
Solution Approach 2:
The coating implements local quality by creating a multi-component system where different materials perform different functions: the thermoplastic elastomer provides structural durability and substrate bonding, while the fluorinated compounds and silicone compounds concentrated at the surface provide ice adhesion reduction. This spatial differentiation of material properties resolves the contradiction between durability and icephobicity.
2Illumination intensity
If transparent coatings are applied, then optical clarity is improved, but ice adhesion reduction is worsened (prior transparent coatings lack icephobic performance)
Solution Approach 1:
The patent applies parameter changes by carefully controlling the refractive indices of the coating components to match each other, thereby maintaining transparency. Simultaneously, it changes the surface energy parameters through fluorinated and silicone compounds to achieve low ice adhesion. The formulation balances optical parameters (transparency) with surface energy parameters (icephobicity).
Solution Approach 2:
The transparent icephobic coating is achieved through composite materials that combine transparent thermoplastic elastomers with fluorinated and silicone compounds. This composite formulation maintains optical clarity while introducing low-surface-energy components that reduce ice adhesion, resolving the contradiction between transparency and icephobic performance.
3Object-affected harmful factors
If effective ice adhesion reduction is achieved using sacrificial oils or greases, then ice adhesion is improved, but durability is worsened (limited useful lifetimes requiring regular reapplication)
Solution Approach 1:
The patent moves away from the disposable sacrificial oil/grease approach by creating a durable integrated coating system. The fluorinated and silicone compounds are permanently incorporated into the thermoplastic elastomer matrix, eliminating the need for regular reapplication while maintaining ice adhesion reduction throughout the coating's service life.
Solution Approach 2:
The composite material system integrates icephobic components (fluorinated and silicone compounds) within a durable thermoplastic elastomer matrix. This integration ensures that the ice adhesion reduction properties are permanently embedded in the coating structure, providing long-term durability without requiring periodic reapplication of separate lubricants or sacrificial materials.
4Illumination intensity
If phase inhomogeneity is reduced to achieve transparency, then optical clarity is improved, but coating function may be worsened (need to preserve coating function during actual use)
Solution Approach 1:
The patent applies parameter changes by optimizing the phase inhomogeneity to a specific range (10 nanometers to 10 microns) that maintains transparency while preserving functional performance. This controlled parameter adjustment ensures that the coating retains its icephobic and durable properties despite the phase-separated structure necessary for optical clarity.
Solution Approach 2:
The coating implements local quality by allowing phase inhomogeneity at the microscale (10 nm to 10 µm) that preserves functional properties while maintaining macroscopic transparency. The different phases (thermoplastic elastomer matrix with fluorinated and silicone compounds) are distributed in a controlled manner that ensures both optical clarity and functional performance are maintained simultaneously.
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 coating achieves high transparency and effective ice adhesion reduction, maintaining durability and functionality under atmospheric conditions.
Implementation Method 1
one of the first component or the second component is a low-surface-energy polymer having a surface energy between about 5 mJ/m2 and about 20 mJ/m2
Implementation Method 2
the other is a hygroscopic material
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Some variations provide a method of forming a transparent icephobic coating, comprising: obtaining a hardenable precursor comprising a first component and a plurality of inclusions containing a second component, wherein one of the first component or the second component is a low-surface-energy polymer, and the other is a hygroscopic material; applying mechanical shear and/or sonication to the hardenable precursor; disposing the hardenable precursor onto a substrate; and curing the hardenable precursor to form a transparent icephobic coating. The coating contains a hardened continuous matrix containing regions of the first component separated from regions of the second component on an average length scale of phase inhomogeneity from 10 nanometers to 10 microns, such as less than 1 micron, or less than 100 nanometers. The transparent icephobic coating may be characterized by a light transmittance of at least 50% at wavelengths from 400 nm to 800 nm, through a 100- micron coating.