Aqueous Acrylic Polyurethane Dispersion for Chemical Resistance
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Solution Overview
Problem
One component aqueous polyurethane coatings lack desirable chemical resistance and abrasion resistance compared to solvent-based or two-component alternatives, while also contributing to increased volatile organic compound (VOC) levels due to solvent additives.
Innovation Solution
Aqueous acrylic/polyurethane dispersion is produced using a polyol mixture comprising a polyester polyol, a hydroxyl functionalized oil polyol, and an oligomer derived from fatty acids, in the presence of a reactive acrylate solvent, reducing the need for solvent additives and enhancing chemical resistance without compromising hardness and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solvent additives are used to improve coating properties, then ease of manufacture and coating performance are improved, but volatile organic compound (VOC) levels increase
Solution Approach 1:
The patent changes the chemical composition parameters by using a polyol mixture containing at least two different oleo-based polyols (one being hydroxyl functionalized oil, another being oligomer from fatty acids) instead of traditional solvent systems. This parameter change achieves desirable coating properties while reducing VOC levels by eliminating or minimizing solvent additives.
Solution Approach 2:
The invention creates a composite binder system by combining polyester polyol, polycarbonate polyol, polyether polyol, and at least two different oleo-based polyols in specific proportions. This composite polyol mixture provides enhanced chemical resistance and coating performance without requiring high levels of solvent additives, thus reducing VOC content while maintaining manufacturability.
2Ease of operation
If one component aqueous polyurethane coatings are used instead of solvent-based or two-component coatings, then environmental friendliness and ease of use are improved, but chemical resistance and abrasion resistance deteriorate
Solution Approach 1:
The patent develops a composite binder formulation combining polyester polyol, polycarbonate polyol, polyether polyol, and at least two different oleo-based polyols in a one-component aqueous system. This composite structure provides enhanced chemical resistance and abrasion resistance comparable to solvent-based or two-component coatings, while maintaining the environmental benefits and ease of use of water-based single-component systems.
Solution Approach 2:
The invention modifies the chemical composition parameters of the polyol mixture by incorporating specific ratios of polyester polyol (10-50 parts), polycarbonate polyol (10-40 parts), polyether polyol (10-40 parts), and oleo-based polyols (20-60 parts total). These parameter changes enable the one-component aqueous system to achieve reliability in chemical resistance while preserving ease of operation.
3Ease of manufacture
If traditional polyol compositions are used in aqueous polyurethane coatings, then ease of manufacture is maintained, but chemical resistance and hardness are insufficient
Solution Approach 1:
The patent creates a composite polyol system that maintains ease of manufacture by using conventional polyol types (polyester, polycarbonate, polyether) but enhances performance through their specific combination with oleo-based polyols. The composite formulation provides improved chemical resistance and hardness while keeping the manufacturing process simple and compatible with existing aqueous polyurethane production methods.
Solution Approach 2:
The invention changes the compositional parameters by specifying that the polyol mixture must contain at least two different oleo-based polyols (one hydroxyl functionalized oil, one oligomer from fatty acids) in combination with polyester, polycarbonate, and polyether polyols. This parameter modification enhances strength properties while maintaining ease of manufacture through compatibility with existing processes.
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 solution provides improved chemical resistance and maintains or exceeds the hardness and abrasion resistance of traditional coatings, while significantly reducing VOC levels, making it suitable for various applications and potentially enhancing two-component coatings.
Implementation Method 1
The aqueous acrylic/polyurethane dispersion is produced from at least one isocyanate component, a polyol mixture, at least one acrylate solvent
Data Source
AI summary
Embodiments described herein provide a coating composition including an aqueous acrylic/polyurethane dispersion. The aqueous acrylic/polyurethane dispersion is produced from at least one isocyanate component, a polyol mixture, and at least one acrylate solvent. The polyol mixture includes a polyester polyol and at least two different oleo-based polyols. The coating composition exhibits improved chemical resistance without sacrificing other properties, such as hardness and abrasion resistance.