Hydrogenated Bisphenol Polymer Coating for High Brightness Low VOC
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Solution Overview
Problem
Conventional polyurethane coatings struggle to achieve high brightness while maintaining a high solid content and reducing volatile organic compounds (VOC), as they require a large amount of solvent, which does not meet regulatory standards in jurisdictions like Europe, America, and China.
Innovation Solution
A polymer is formed by reacting a diol with a hydrogenated bisphenol group and a bis-epoxy compound, creating a coating material with a specific chemical structure that balances molecular weight, viscosity, and solid content, allowing for a high solid content and low VOC while maintaining brightness greater than 90.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large amount of solvent is added to achieve high brightness, then the brightness requirement is met, but the VOC content becomes too high
Solution Approach 1:
The patent changes the chemical structure parameters of the polyol resin by using hydrogenated bisphenol A diol with specific molecular weight and hydroxyl value ranges, which alters the physical properties of the coating to achieve high brightness with reduced solvent content
Solution Approach 2:
The patent creates a composite coating system by combining specifically formulated polyol resin with polyisocyanate curing agents and optional fillers, where the synergistic interaction of components achieves high brightness without requiring excessive solvent
2Object-generated harmful factors
If the solid content of the coating material is increased to reduce VOC, then the VOC requirement is met, but the brightness decreases
Solution Approach 1:
The patent optimizes key parameters including hydroxyl value (40-100 mg KOH/g) and weight average molecular weight (1000-5000 g/mol) of the polyol resin to achieve the optimal balance between solid content and brightness
Solution Approach 2:
The patent introduces specific structural features (hydrogenated bisphenol A groups) at critical positions in the polymer chain to create local regions with high light scattering capability, maintaining brightness even at high solid content
3Ease of manufacture
If conventional linear polyol resin is used, then the coating can be formulated, but the brightness and climate resistance requirements cannot be met
Solution Approach 1:
The patent uses composite polyol resin containing hydrogenated bisphenol A diol combined with polyisocyanate to create a crosslinked network structure that simultaneously provides formulability, high brightness, and climate resistance
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating aromatic hydrocarbon groups from hydrogenated bisphenol A, which provide enhanced light scattering properties and crosslinking density for improved performance
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 polymer-based coating material achieves a high solid content of 60% to 80% and low VOC, ensuring high brightness and compliance with regulatory standards, while maintaining processability and adhesion properties.
Implementation Method 1
a polymer, formed by reacting a diol having a hydrogenated bisphenol group with a bis-epoxy compound
Data Source
AI summary
A polymer is provided, which is formed by reacting a diol having hydrogenated bisphenol group with a bis-epoxy compound. The diol having hydrogenated bisphenol group may have a chemical structure ofwherein each of R1 is independently H or methyl, and m and n are independently integers of 1 to 4. The bis-epoxy compound can beor a combination thereof, wherein each of R2 is independently H or methyl, and each of R3 is independently H or methyl.