Hybrid Coating Resin System for Fast Ambient Cure
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Solution Overview
Problem
Existing coatings struggle to achieve high flexibility, gloss, and weathering resistance while curing at ambient temperature in a short time, with compatibility issues between polyurethane resin, polyaspartic resin, and monomers capable of ring opening metathesis polymerization, and require high VOCs for application via airless spray or plural component spray.
Innovation Solution
A hybrid coating composition combining polyol resin, polyaspartic resin, monomers capable of ring opening metathesis polymerization, isocyanate curatives, and a ruthenium-based Grubbs catalyst, with fillers and additives, allowing for dual cure mechanisms and reduced VOCs through careful resin and isocyanate selection, and the use of cure accelerators for faster drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating uses polyurethane resin, polyaspartic resin and monomers capable of ring opening metathesis polymerization to achieve high flexibility, gloss and weathering resistance, then the coating performance is improved, but compatibility issues arise between the resins and monomers
Solution Approach 1:
The patent combines polyurethane resin, polyaspartic resin, and cyclic olefin monomers into a hybrid coating composition. This composite approach allows the coating to achieve high flexibility, gloss, and weathering resistance while the specific selection of compatible materials ensures stable coexistence of the different resin and monomer components throughout storage and application.
2Productivity
If the coating cures at ambient temperature in a short amount of time, then productivity is improved, but the cure time and rheology must be precisely controlled to enable proper application
Solution Approach 1:
The patent employs a dual-cure mechanism where the coating can initially set at ambient temperature through one pathway while simultaneously maintaining workability through controlled rheology. The second cure pathway completes the crosslinking, achieving fast final cure. This dynamic approach allows the coating to transition from an applyable state to a cured state, balancing productivity with application ease.
Solution Approach 2:
The patent carefully controls the glass transition temperature (Tg) of the resin components and the molecular weight of the polyol to optimize the balance between cure speed and application window. By adjusting these parameters, the coating achieves rapid ambient cure while maintaining proper flow and leveling characteristics during the application period.
3Quantity of substance
If the coating uses high filler content greater than 45% to reduce costs and improve properties, then cost and performance are improved, but the viscosity and applicability become more difficult to control
Solution Approach 1:
The patent uses specific polyol resins and polyaspartic resins as intermediaries that are compatible with high filler loads. These resin components act as dispersants and rheology modifiers, allowing the coating to maintain high filler content (greater than 45%) for cost reduction and improved properties while still achieving proper flow, leveling, and application characteristics.
4Adaptability or versatility
If the coating is formulated for airless spray application or plural component spray, then versatility of application methods is improved, but the formulation complexity and rheology requirements increase
Solution Approach 1:
The patent formulates a universal coating composition that can be applied through multiple methods including airless spray, plural component spray, brush, and roller. The formulation achieves this versatility by carefully balancing the resin composition, solvent selection, and rheology modifiers to provide appropriate flow and application characteristics across different application techniques without requiring separate formulations for each method.
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 achieves good adhesion, flexibility, and weathering resistance with reduced VOCs, enabling application via various methods and providing a balance between short dry times and longer pot life, making it suitable for exterior applications.
Implementation Method 1
monomers capable of undergoing ring opening metathesis polymerization
Implementation Method 2
polyol resin, polyaspartic resin and monomers capable of undergoing ring opening metathesis polymerization which is curable at ambient temperature using both an isocyanate curative and ruthenium-based Grubbs catalyst
Data Source
AI summary
A coating composition includes a polyol resin; a polyaspartic resin; monomers capable of undergoing ring opening metathesis polymerization; an isocyanate curing agent; and a metathesis catalyst. The coating composition may further include a solvent; a filler; an adhesion promoter; a rheology modifier; and/or a pigment. The polyol resin may include tetramethyl-1,3-cyclobutanediol. The isocyanate curing agent may include an aliphatic polyisocyanate (e.g., a hexamethylene diisocyanate trimer).