Two-Component Coating Composition for Erosion Resistance
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Solution Overview
Problem
Current coatings for objects exposed to high mechanical demands, such as rotor blades and aircraft, face limitations in erosion resistance due to issues like limited UV resistance, high temperature requirements, and weight concerns, especially in windy locations and high-speed operations.
Innovation Solution
A two-component coating composition comprising a base paint component with polycarbonate diol and diamine containing secondary amino groups, and a hardener component with polyisocyanate-modified polyester, which can be easily processed and cured at lower temperatures, enhancing erosion resistance without the need for UV initiators or high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of coatings is increased to improve erosion resistance, then erosion resistance is improved, but weight increases which is undesirable in aircraft and rotor blade construction
Solution Approach 1:
The invention changes the chemical composition parameters of the coating system by using polycarbonate diols with specific molecular weights (500-5000 g/mol) and combining them with diamines and polyisocyanates to create a two-component system that cures at room temperature. This parameter optimization allows achieving high erosion resistance with thinner coating layers, thereby reducing weight while maintaining protective performance.
2Strength
If UV resins are used to improve wear resistance, then wear resistance is improved, but pigment selection is limited due to absorption maxima at specific curing wavelengths and layer thicknesses are limited
Solution Approach 1:
The invention substitutes the UV curing mechanism with a room-temperature chemical curing mechanism using polycarbonate diols, diamines, and polyisocyanates. This replacement eliminates the wavelength-dependent absorption limitations of UV resins, allowing free selection of pigments and fillers without restriction from curing wavelength interference, while still achieving high wear resistance through the crosslinked polymer network formed during curing.
3Ease of manufacture
If temperature-induced curing is used for single-component coatings, then curing is achieved, but curing temperatures must be carefully controlled in relation to system dimensioning for large components
Solution Approach 1:
The invention changes the curing temperature parameter from elevated temperatures to room temperature by selecting polycarbonate diols with molecular weights of 500-5000 g/mol that react with diamines and polyisocyanates at ambient conditions. This parameter change eliminates the need for complex temperature control systems and oven infrastructure, significantly simplifying the manufacturing process for large components while maintaining curing effectiveness.
4Strength
If epoxy resins with aromatic components are used to achieve high wear resistance, then wear resistance is improved, but UV resistance is significantly limited
Solution Approach 1:
The invention creates a composite coating system combining polycarbonate diols, diamines, and polyisocyanates that forms a crosslinked network with both high wear resistance and good UV resistance. The polycarbonate backbone provides UV stability while the crosslinked structure delivers wear resistance, achieving a balance that aromatic epoxy resins cannot provide alone.
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 excellent erosion resistance, suitable for large components like rotor blades and aircraft, with improved processing ease and environmental benefits by avoiding high temperatures and organic solvents, effectively protecting against erosion from rain and sand.
Implementation Method 1
a base coating component comprising (A) at least one polycarbonate diol, (B) at least one diamine having secondary amino groups, and (2) a hardener component comprising (C) at least one polyisocyanate-modified polyester
Data Source
AI summary
The invention relates to a two-component coating composition comprising (1) a base component comprising (A) at least one polycarbonate diol, (B) at least one diamine that contains secondary amino groups and an aliphatic group (b1) between the nitrogen atoms of the amino groups, and (2) a hardener component comprising (C) at least one polyisocyanate-modified polyester having an isocyanate content of 4 to 15%. The invention also relates to a method for coating substrates by applying the coating composition as well as to the use thereof.