RMA Coating Systems for Wind Turbine Blades
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Solution Overview
Problem
Coating materials based on RMA systems for large components like wind turbine rotor blades face challenges with short pot life and rapid curing, which limits processing time and surface smoothness, and require improved weatherability and low-temperature elasticity.
Innovation Solution
The development of coating materials comprising CH-acidic compounds, vinylogous carbonyl compounds, latent catalysts, light stabilizers, pot life extenders, open time extenders, inorganic/organic pigments, and matting agents, optimized in specific ratios and formulations to enhance pot life, open time, and drying behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If high catalyst contents are used to achieve rapid curing, then drying time is reduced, but pot life is greatly shortened
Solution Approach 1:
The patent changes the chemical parameters of the coating system by introducing a latent catalyst system that undergoes a transformation from inactive to active state. The latent catalyst precursor is stable during storage and mixing (maintaining pot life) but activates under specific conditions after application (enabling rapid curing). This parameter change resolves the contradiction by decoupling the stability period from the curing period.
Solution Approach 2:
The patent applies preliminary action by incorporating the latent catalyst precursor into the coating formulation before application, but keeping it in an inactive state during storage and mixing. The catalyst is pre-positioned in the system but only becomes active after application, allowing the coating to maintain long pot life while still achieving rapid curing once applied.
2Area of stationary object
If coating materials are applied to large surfaces, then coverage area is increased, but processing time and required pot life are extended
Solution Approach 1:
The latent catalyst system enables parameter change in the coating's reactivity profile. During storage and transport to large surfaces, the coating remains in a low-reactivity state with extended pot life. Once applied, the catalyst activates and the coating rapidly cures, allowing sufficient time to cover large areas while maintaining the ability to complete curing without requiring excessively long pot life.
3Speed
If forced drying at elevated temperatures is used to accelerate drying, then drying speed is increased, but equipment complexity and energy consumption increase
Solution Approach 1:
The coating system performs self-service by containing its own catalyst system that enables autonomous curing without external heating equipment. The latent catalyst activates under ambient or mild conditions, allowing the coating to dry rapidly at room temperature or with minimal energy input, eliminating the need for complex forced-drying ovens while maintaining high drying speed.
4Productivity
If rapid curing is achieved, then productivity is improved, but surface smoothness and leveling properties deteriorate
Solution Approach 1:
The curing process follows periodic action with distinct phases: an initial slow phase that allows surface leveling and smoothing, followed by a rapid curing phase that achieves full crosslinking. The latent catalyst system controls this timing sequence, enabling the coating to first flow and level properly (maintaining surface smoothness) and then rapidly cure (achieving high productivity).
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 materials exhibit significantly improved storage stability, longer pot and open times, enhanced weatherability, and faster drying at room temperature, with increased resistance to UV degradation and low-temperature flexibility, making them suitable for large components like wind turbine rotor blades.
Implementation Method 1
Coating materials that crosslink in a Michael addition reaction are known. The coatings produced from this have high weathering stability and chemical resistance.
Implementation Method 2
The term light stabilizer is understood to mean additives and auxiliary materials that protect coatings against the influence of UV light, in particular preventing or at least significantly delaying polymer degradation caused by UV radiation.
Data Source
AI summary
The invention relates to improved coating materials based on RMA systems, which cross-link with the aid of the classic Michael addition. The coating materials comprise at least 10 - 70wt.% of one or more CH-acidic compounds A, 4 - 40 wt.% of one or more vinylogous carbonyl compounds B, 1.5 - 15wt.% of one or more latent-basic catalysts C, up to 10wt.% one or more light protective agents, up to 20wt.% of one or more open time extenders, up to 20wt.% of one or more pot life extenders, up to 70 wt.% of one or more inorganic and/or organic pigments and 0.1 - 40wt.% of one or more anti-corrosion agents, respectively with respect to the total amount of the coating material. The invention also relates to thus produced coatings, in particular matt finish top coat and coated components, in particular for components for wind power plants, such as for example, vanes or rotor blades.