Erosion-Resistant Coating via Polycaprolactone Polyols
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Solution Overview
Problem
Existing erosion protection coatings for rotor blades lack sufficient weathering stability and processability, with known compositions either compromising on erosion resistance or softening under temperature, and are limited in color options due to restricted pigment selection, while also being sensitive to moisture and molecular sieves.
Innovation Solution
A two-component coating material comprising a base component with trifunctional polycaprolactone polyols and polycarbonate diols, and a hardener component with crystallization-resistant isocyanate-functional polyester prepolymers, allowing for improved weathering and erosion resistance, and enabling the use of various pigments and molecular sieves without compromising stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polycarbonate polyols and aliphatic secondary amines are used in base component with polyisocyanate-modified polyesters in hardener component, then coating material can be processed, but coatings lack sufficient weather resistance and soften under temperature influence
Solution Approach 1:
The patent changes the chemical composition parameters of the base component by replacing polycarbonate polyols with polycaprolactone polyols and polycarbonate diols, and adjusting the OH content to 0.55-1.75 mol/kg. This parameter change enables the coating to maintain both processability and weather resistance, preventing softening under temperature while allowing proper curing with isocyanate hardeners.
Solution Approach 2:
The patent creates a composite coating system combining polycaprolactone polyols, polycarbonate diols, and polyaspartic acid esters in the base component with isocyanate-functional hardeners. This composite material approach achieves synergistic effects where the combination of specific polyol types and the molecular sieve provides both processability and enhanced weathering stability without softening at elevated temperatures.
2Ease of manufacture
If molecular sieve is used as water scavenger in coating material, then processing in humid conditions is enabled, but erosion resistance of coating is significantly impaired
Solution Approach 1:
The patent introduces polyaspartic acid esters as an intermediary component that mediates between the isocyanate groups and water. This intermediary reacts preferentially with water, protecting the isocyanate groups from degradation while maintaining erosion resistance. The polyaspartic acid esters act as a buffer that allows processing in humid conditions without requiring molecular sieve, thus preserving coating strength and erosion protection.
3Strength
If organosilane-modified pigments and fillers are used in erosion protection coatings, then erosion resistance is maintained, but selection of usable pigments is limited and not every color shade can be achieved
Solution Approach 1:
The patent creates a universal base component system using polycaprolactone polyols, polycarbonate diols, and polyaspartic acid esters that is compatible with multiple types of pigments and fillers. This multi-functional formulation allows the use of both organosilane-modified pigments for erosion resistance and conventional pigments for color variety, enabling the coating to achieve both high erosion protection and diverse color shades without compromise.
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 material provides enhanced weathering stability, temperature resistance, and improved erosion protection, allowing for a wide range of color options and processing in high humidity conditions without property deterioration.
Implementation Method 1
the side reaction of the isocyanate groups with water
Implementation Method 2
coatings that are, on the one hand, sufficiently elastic to absorb the impact forces
Implementation Method 3
they must exhibit sufficient hardness and abrasion resistance
Data Source
AI summary
The present invention relates to coating material compositions used for producing particularly erosion-stable coatings. The invention also relates to the use of these coatings as erosion protection, in particular as edge protection for rotor blades. The composition according to the invention comprises a stock component and a hardener component, wherein the stock component comprises at least one trifunctional polycaprolactone polyol or at least one polycarbonate diol or at least one trifunctional polycaprolactone polyol and a polycarbonate diol and the hardener component comprises at least one crystallization-resistant, isocyanate-functional prepolymer.