Aqueous Polyurethane Resin Composition for Coating Adhesion and Impact Resistance
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Solution Overview
Problem
Aqueous polyurethane resin compositions used for coating electrodeposited metal substrates face challenges in achieving both excellent finished appearance and impact resistance, such as chipping resistance, while maintaining good adhesion.
Innovation Solution
An aqueous polyurethane resin composition is formulated with specific components including at least two types of organic diisocyanate compounds, a polyol compound, acidic group-containing compounds, and a chain extender, with controlled viscosity between 500 Pa·s and 50,000 Pa·s, to enhance flow properties, adhesion, and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the polyurethane resin is used with high solid content to improve adhesion and impact resistance, then the viscosity increases excessively, but the flow property deteriorates and finished appearance is compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the viscosity of the aqueous polyurethane resin composition to fall within the specific range of 500-50,000 Pa·s at 65% solid content. This viscosity control enables the resin to maintain both good flow properties for finished appearance and sufficient adhesion/impact resistance, resolving the contradiction between these properties.
Solution Approach 2:
The patent uses a composite approach by formulating the aqueous polyurethane resin composition with multiple specific components including at least two types of organic diisocyanate compounds, polyol compounds, acidic group-containing compounds, and chain extenders. This composite formulation achieves the optimal balance between viscosity, flow property, adhesion, and impact resistance simultaneously.
2Ease of operation
If the viscosity is reduced to improve flow property and finished appearance, then the adhesion and impact resistance deteriorate
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal viscosity range (500-50,000 Pa·s at 65% solid content) that balances flow property and mechanical performance. The viscosity is controlled through careful selection of molecular weight ranges for polyol compounds (400-6000 g/mol) and other formulation parameters, ensuring both good flow and sufficient adhesion/impact resistance.
Solution Approach 2:
The patent employs a composite material strategy by combining multiple functional components in specific proportions: at least two types of organic diisocyanate compounds, polyol compounds with controlled molecular weight, acidic group-containing compounds (0.1-10% by weight), and chain extenders. This composite formulation achieves synergistic effects that simultaneously optimize flow property and mechanical properties.
3Ease of manufacture
If a single type of diisocyanate compound is used to simplify the formulation, then the manufacturing complexity is reduced, but the adhesion and impact resistance are insufficient
Solution Approach 1:
The patent applies composite material principles by requiring at least two types of organic diisocyanate compounds in the formulation. This composite approach enhances adhesion and impact resistance through synergistic effects between different diisocyanate compounds, while the patent provides guidance on selection criteria to manage formulation complexity.
Solution Approach 2:
The patent applies local quality by specifying different functional requirements for different components: at least two types of organic diisocyanate compounds contribute to adhesion and impact resistance, while polyol compounds with specific molecular weights (400-6000 g/mol) control viscosity and flow property. This differentiated functional assignment optimizes overall 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 composition achieves excellent finished appearance, adhesion to electrodeposition films, and impact resistance, making it suitable for various coating applications, including monocoat and multilayer systems.
Implementation Method 1
a polyurethane resin obtained from constituents including: (a) at least two types of organic diisocyanate compounds and/or polyisocyanate compounds which are different from each other; (b) a polyol compound
Implementation Method 2
even in a state where water after application is volatilized and the resin particles are fused and solidified
Implementation Method 3
it is particularly necessary to continuously improve the finished appearance, impact resistance and adhesion
Data Source
AI summary
Provided is an aqueous polyurethane resin composition which is excellent in finished appearance as well as excellent in impact resistance, such as chipping resistance, and adhesion. The aqueous polyurethane resin composition includes a polyurethane resin obtained from at least (a) at least two types of organic diisocyanate compounds and/or polyisocyanate compounds which are different from each other; (b) a polyol compound; (c) an acidic group-containing compounds comprising at least two types of compounds which are a compound containing a carboxyl group as the acid group (a carboxyl group-containing compound) and a compound containing a sulfo group as the acid group (a sulfo group-containing compound); and (d) a chain extender of a polyamine compound, a diamine compound, a polyol compound and/or an alkanolamine compound with a molecular weight of not more than 400, in which the aqueous polyurethane resin composition has a viscosity of not less than 500 Pa·s and not more than 50,000 Pa·s when the polyurethane resin is contained in an amount of 65% by weight.