Hydroxyfunctional Polyether Aqueous Basecoat Stone Chip Resistance
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Solution Overview
Problem
Current multi-layer paint systems lack sufficient stone chip resistance and are not environmentally friendly due to the use of organic solvents, necessitating the development of aqueous basecoats with improved mechanical properties.
Innovation Solution
A pigmented aqueous basecoat containing a hydroxy-functional polyether-based reaction product, produced by reacting organic diisocyanates with hydroxy-functional polyethers, is used to enhance stone chip resistance while transitioning to aqueous-based coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic solvent-based coating agents are used, then application properties and film formation are improved, but environmental compatibility deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of the solvent system from organic to aqueous, developing water-based coating agents that maintain film formation capabilities while eliminating harmful organic solvents. This is achieved through specific polymer compositions and formulations designed for aqueous systems.
Solution Approach 2:
The patent substitutes the chemical mechanism of organic solvent evaporation and polymer coalescence with an aqueous-based mechanism involving water evaporation and polymer particle fusion, replacing the harmful chemical system with a environmentally friendly alternative that achieves similar functional results.
2Ease of manufacture
If conventional basecoat formulations are used, then manufacturing simplicity is maintained, but stone chip resistance deteriorates
Solution Approach 1:
The patent creates composite coating systems combining specific polymer resins with carefully selected pigment and additive packages. The basecoat formulation integrates multiple functional components that work synergistically to provide both ease of application and enhanced mechanical resistance to stone chips.
Solution Approach 2:
The patent optimizes specific local properties of the basecoat formulation, such as polymer molecular weight distribution, crosslinking density, and additive concentrations, to enhance stone chip resistance in critical areas while maintaining overall manufacturability and application properties.
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 use of hydroxy-functional polyether-based reaction products in aqueous basecoats significantly improves stone chip resistance and allows for the production of environmentally friendly multi-layer coatings with enhanced mechanical stability.
Implementation Method 1
reacting (a) at least one isocyanate group-containing component that can be produced by urethane group-forming reaction of at least one organic diisocyanate (a1) with at least one polyether (a2)
Data Source
AI summary
The invention relates to a pigmented aqueous base paint which contains a hydroxy-functional polyether-based reaction product that can be produced by means of a urethane group-forming conversion of (a) at least one isocyanate group-containing component, which can be produced by a urethane group-forming reaction of at least one organic diisocyanate (a1) with at least one polyether (a2) of the general structural formula (I), in which R is a C3- to C6 alkyl group and n is selected in a corresponding manner such that the polyether (b) has a number-average molecular weight of 500 to 5000 g/mol, wherein the components (a1) and (a2) are used in a molar ratio of 1.8/1.7 to 3.0/1.0, and the resulting component (a) has an isocyanate content of 0.5 to 10.0%, with (b) at least one organic polyol. The quantities of the components (a) and (b) are adjusted relative to each other such that the ratio of the molar quantity of isocyanate groups of the component (a) and the molar quantity of the component (b) ranges from 0.33 to 0.95, and the resulting reaction product has a number-average molecular weight of 700 to 20000 g/mol.