Solvent-Borne Polyurethane Coatings With Water-Dispersible Polyisocyanate
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Solution Overview
Problem
Conventional solvent-borne multi-component polyurethane coating compositions provide good appearance but lack sufficient chemical, scratch, and mar resistance.
Innovation Solution
Incorporating a water-dispersible polyisocyanate with sulfonic acid and/or phosphate ether groups into a solvent-borne coating composition to enhance chemical and scratch resistance without compromising appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solvent-borne multi-component polyurethane coating compositions are used, then good appearance properties (gloss) are achieved, but chemical, scratch and mar resistance are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyurethane system by introducing water-dispersible polyisocyanates with specific functional groups (sulfonic acid and/or phosphate ether groups) to alter the curing network structure, thereby improving resistance properties while maintaining appearance quality
Solution Approach 2:
The patent creates a composite coating system by combining conventional polyurethane components with water-dispersible polyisocyanates having specific functional groups, resulting in a multi-component formulation that achieves both good appearance and enhanced resistance properties
2Reliability
If water-dispersible polyisocyanate with sulfonic acid and/or phosphate ether groups is incorporated, then chemical and scratch resistance are improved, but formulation complexity increases
Solution Approach 1:
The water-dispersible polyisocyanate with sulfonic acid and/or phosphate ether groups serves multiple functions simultaneously: it acts as a curing agent, provides chemical resistance through its functional groups, and maintains compatibility with conventional polyurethane components, thereby reducing the need for separate additives
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 improved chemical and scratch resistance while maintaining or enhancing the appearance of the cured coating.
Implementation Method 1
a first solvent-borne component comprising an active hydrogen-containing polyfunctional compound, and a second solvent-borne component comprising a water-dispersible polyisocyanate having sulfonic acid and/or phosphate ether groups
Data Source
AI summary
The present disclosure relates to solvent-borne coating compositions comprising a water-dispersible polyisocyanate, a method of coating a substrate using such compositions, a substrate comprising the cured coating composition, and the use of water-dispersible polyisocyanates in solvent-borne coating compositions for improving chemical, scratch and/or mar resistance of such coatings.