Wind Turbine Blade Leading-Edge Coating for Erosion Durability
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Solution Overview
Problem
Wind turbine blades experience wear and erosion due to high velocity and collision with rain droplets and particulate material, requiring improved tensile properties and durability in leading-edge coatings.
Innovation Solution
A coating composition comprising at least one polyaspartic and at least one aliphatic polyisocyanate prepolymer, with an additional aliphatic polyisocyanate, is applied to the leading edge of wind turbine blades, enhancing tensile properties and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyaspartic two-component system is used for LEP coating, then tensile properties can be improved, but the complexity of selecting the right binder and curing agent combination increases
Solution Approach 1:
The patent applies parameter changes by specifying a functionality range of 1.2 to 3.5 for the aliphatic polyisocyanate prepolymer curing agent, optimizing the chemical parameters to achieve high tensile properties while providing clear selection criteria that reduce the complexity of binder and curing agent matching
Solution Approach 2:
The patent uses composite materials by combining polyaspartic binder with aliphatic polyisocyanate prepolymer curing agent in a two-component system, creating a composite coating material that achieves superior tensile properties through the synergistic interaction of its components
2Reliability
If LEP coating is applied to protect the leading edge, then durability against wear and erosion is improved, but the coating must maintain properties after UV exposure which adds formulation complexity
Solution Approach 1:
The patent converts the harmful effect of UV exposure into a beneficial outcome by using aliphatic polyisocyanate components that are inherently UV stable, transforming what could be a degradation mechanism into a feature that maintains coating properties after UV exposure
Solution Approach 2:
The patent changes the chemical parameter by selecting aliphatic polyisocyanate with specific functionality (1.2 to 3.5), which provides both durability against wear and erosion and stability under UV exposure, thereby reducing formulation complexity
3Strength
If the coating composition uses multiple aliphatic polyisocyanate components, then tensile stress and strain values are improved, but the number of components increases
Solution Approach 1:
The patent merges multiple functional requirements into a single aliphatic polyisocyanate prepolymer curing agent component, which provides both the curing function and the tensile property enhancement, thereby improving strength without proportionally increasing the number of components
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 provides improved tensile stress and strain values, maintaining properties under UV exposure, with fast drying, good adhesion, and minimal film defects, while offering high gloss retention and durability.
Implementation Method 1
a coating composition comprising: (A) at least one polyaspartic selected from the group consisting of polyaspartic esters, polyetheraspartic esters and mixtures thereof; and (B) at least one aliphatic polyisocyanate prepolymer curing agent; wherein component (B) further comprises an aliphatic polyisocyanate which is different to the at least one aliphatic polyisocyanate prepolymer curing agent
Data Source
AI summary
The invention relates to a wind turbine blade, preferably the leading edge of a wind turbine blade, coated with a coating composition comprising: (A) at least one polyaspartic selected from the group consisting of polyaspartic esters, polyetheraspartic esters and mixtures thereof; and (B) at least one aliphatic polyisocyanate prepolymer curing agent: wherein component B further comprises an aliphatic polyisocyanate which is different to the at least one aliphatic polyisocyanate prepolymer curing agent.