Aqueous Two-Component Coating Erosion Resistance
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Solution Overview
Problem
Current coating compositions for erosion resistance face challenges in achieving high erosion resistance while maintaining a good environmental profile and freedom of formulation, particularly in applications like wind turbine rotor blades and aircraft, where they are sensitive to additives and require low organic solvent content.
Innovation Solution
An aqueous two-component coating composition comprising an aqueous dispersion of polymeric resin and polycarbonate diol combined with a polyisocyanate-modified polyester, which provides excellent erosion resistance and a good environmental profile without the need for excessive film thickness or high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If film thickness is increased to improve erosion resistance, then erosion resistance is improved, but weight increases
Solution Approach 1:
The patent changes the chemical composition parameters of the coating system by using aqueous polymeric resin dispersions with specific molecular weights and functionality ratios, along with polyisocyanate crosslinking agents. This chemical parameter optimization enables achieving high erosion resistance through improved molecular network structure rather than increased thickness, thus reducing coating weight while maintaining reliability.
2Object-generated harmful factors
If organic solvent content is reduced to improve environmental profile, then environmental compatibility is improved, but formulation freedom and compatibility with pigments/fillers deteriorates
Solution Approach 1:
The patent changes the solvent system parameter from organic-based to aqueous-based, using water as the primary dispersion medium. This parameter change is compensated by optimizing other formulation parameters including resin solids content (40-80%), pH control (7-9), and use of specific dispersants and surfactants, thereby maintaining formulation freedom and compatibility with pigments and fillers while achieving low VOC emissions (<250 g/l).
Solution Approach 2:
The patent introduces aqueous dispersion technology as an intermediary system, where polymeric resins are dispersed in water with the aid of surfactants and dispersants. These intermediary substances enable the aqueous system to achieve properties previously only attainable with organic solvents, including proper viscosity control, pigment wetting, and film formation, thus bridging the gap between environmental requirements and formulation flexibility.
3Object-generated harmful factors
If low solvent content is used to improve environmental profile, then VOC content is reduced, but sensitivity to additives and risk of separation increases
Solution Approach 1:
The patent optimizes the aqueous dispersion parameters including pH (7-9), ionic strength, and surfactant concentration to ensure colloidal stability. By controlling these parameters, the system achieves low VOC content while preventing phase separation and maintaining composition stability during storage and application.
Solution Approach 2:
The patent implements quality control feedback mechanisms by monitoring key parameters such as pH, viscosity, and particle size distribution during formulation and storage. This continuous monitoring and adjustment of critical parameters ensures that the aqueous coating system maintains stability and prevents separation, allowing for reduced VOC content without compromising composition integrity.
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 achieves outstanding erosion resistance and a high-grade environmental profile, allowing for low-temperature curing and reduced sensitivity to additives, thus addressing the limitations of existing compositions.
Implementation Method 1
An aqueous two-component coating composition comprising an aqueous dispersion of polymeric resin and polycarbonate diol combined with a polyisocyanate-modified polyester
Data Source
AI summary
The present invention relates to an aqueous two-component coating composition comprising (1) an aqueous paint base component comprising (A) at least one aqueous dispersion of at least one polymeric resin and (B) at least one polycarbonate diol and also (2) a hardener component comprising (C) at least one polyisocyanate-modified polyester having an isocyanate content of 4% to 15%. The present invention also relates to a method for coating on substrates by applying the coating composition and also to the use thereof.