Polysiloxane Icephobic Coating for Sensor Integrity
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Solution Overview
Problem
Existing icephobic coatings often rely on environmentally problematic fluorine-based resins and do not effectively prevent ice accumulation on vehicle surfaces under severe weather conditions, which can impair sensor integrity and reliability.
Innovation Solution
A two-pack coating composition comprising Component A with polysiloxanes having 4 or more isocyanate reactive groups and organic polymers with polysiloxane chains and isocyanate reactive functional groups, and Component B with chemical species containing free isocyanate and hydrolysable silane groups, which are mixed to form a cured icephobic coating layer without the need for fluorine-based resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluorine-based resins are used in icephobic coatings, then ice adhesion strength is reduced, but environmental harm increases
Solution Approach 1:
The invention changes the chemical composition parameters of the coating by using polysiloxane-based materials with specific functional groups (isocyanate reactive groups, hydrolysable silane groups) instead of fluorine-based resins. This parameter substitution maintains icephobic properties while eliminating environmental harm associated with fluorine compounds.
Solution Approach 2:
The invention employs a composite coating system comprising multiple components (A and B) that react to form a cured coating layer. The composite nature combines polysiloxanes with isocyanate reactive groups and hydrolysable silane groups, creating a material that achieves icephobicity through synergistic interactions rather than relying on harmful fluorine-based resins.
2Reliability
If conventional coatings are used, then manufacturing simplicity is maintained, but sensor reliability under ice conditions deteriorates
Solution Approach 1:
The invention applies icephobic properties preliminarily through a cured coating layer formed before ice accumulation occurs. The coating is applied and cured in advance on vehicle surfaces (including sensors), preventing ice adhesion before it becomes a problem, thereby maintaining sensor reliability without requiring complex real-time interventions.
Solution Approach 2:
The invention changes the surface energy parameters of the coating through the use of polysiloxane-based materials, creating a surface that inherently resists ice adhesion. This parameter modification ensures sensor reliability under ice conditions while the two-component system provides controlled complexity for achieving the desired performance.
3Object-generated harmful factors
If polysiloxane-based coating is used instead of fluorine-based resin, then environmental compatibility is improved, but icephobic performance may be compromised
Solution Approach 1:
The invention creates a composite polysiloxane-based coating system combining materials with isocyanate reactive groups and hydrolysable silane groups. This composite approach enables the polysiloxane material to achieve icephobic performance comparable to fluorine-based resins while maintaining environmental compatibility, as the synergistic interaction of components compensates for the lower inherent icephobicity of individual polysiloxane materials.
Solution Approach 2:
The invention modifies the chemical and physical parameters of polysiloxane-based materials by introducing specific functional groups and controlling molecular structure. These parameter changes enable the environmentally friendly polysiloxane coating to achieve sufficient ice adhesion prevention, balancing environmental compatibility with 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 coating composition effectively reduces ice block falling temperature, maintaining sensor integrity and reliability even under severe weather conditions, while avoiding the use of environmentally harmful fluorine-based resins.
Implementation Method 1
Aa) one or more polysiloxanes with 4 or more isocyanate reactive groups; Ba) a chemical species, which comprises on average one or more free isocyanates groups
Implementation Method 2
Ba) a chemical species, which comprises on average one or more free isocyanates groups and on average one or more hydrolysable silane groups
Implementation Method 3
hydrolysable silane groups
Implementation Method 4
lowering ice adhesion strength
Implementation Method 5
Two most basic interactions, namely Coulomb and van der Waals forces, are responsible for intrinsic ice adhesion
Data Source
AI summary
Disclosed herein is a two-pack coating composition including A) a component A including Aa) one or more polysiloxanes with 4 or more isocyanate reactive groups; and Ab) one or more organic polymers, which differ from Aa) and which include a plurality of polysiloxane chains and isocyanate reactive functional groups; and B) a component B including Ba) a chemical species, which includes on average one or more free isocyanates groups and on average one or more hydrolysable silane groups and/or Bb) a chemical species including on average two or more free isocyanates groups and no hydrolysable silane groups. Also disclosed herein are a method of forming a cured coating layer on a substrate making use of the two-pack coating compositions and a method of using the two-pack coating composition for providing an icephobic coating to substrates.