Carboxy-functional Polyether Basecoat for Stonechip Resistance
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Solution Overview
Problem
Current multicoat paint systems lack sufficient mechanical resistance, particularly against stonechip effects, and there is a need for eco-friendly aqueous basecoat materials that provide outstanding adhesion and stonechip resistance.
Innovation Solution
A pigmented aqueous basecoat material comprising a carboxy-functional, polyether-based reaction product, prepared by esterification of dihydroxycarboxylic acid with dicarboxylic acid or their anhydride, with specific molar ratios and molecular weights, is used to enhance stonechip resistance and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional basecoat materials are used in multicoat paint systems, then the painting process can be completed, but the mechanical resistance and stonechip resistance of the coating are insufficient
Solution Approach 1:
The patent modifies the chemical parameters of the basecoat material by incorporating carboxy-functional polyether-based reaction products with specific molecular weights (500-5000 g/mol) and acid numbers (5-50 mg KOH/g). These parameter changes enhance both the mechanical resistance and adhesion qualities of the coating system.
Solution Approach 2:
The invention creates a composite binder system by combining carboxy-functional polyether reaction products with other compatible binders and additives. This composite material approach allows the basecoat to simultaneously achieve improved stonechip resistance and adhesion properties that individual components cannot provide alone.
2Reliability
If organic solvent-based coating compositions are used, then good coating performance can be achieved, but environmental compatibility deteriorates
Solution Approach 1:
The patent transitions from organic solvent-based to water-based formulations by adjusting the chemical parameters of the binders and additives. The carboxy-functional polyether reaction products are specifically designed to function effectively in aqueous environments, maintaining coating performance while eliminating harmful organic solvents.
Solution Approach 2:
The invention replaces the organic solvent delivery system with an aqueous delivery system. Water serves as the primary carrier medium instead of organic solvents, fundamentally changing the chemical basis of the coating composition while maintaining its functional performance through careful selection of water-compatible binders and additives.
3Object-affected harmful factors
If aqueous basecoat materials are used to improve environmental compatibility, then eco-friendly coating can be achieved, but mechanical resistance and stonechip resistance may be compromised
Solution Approach 1:
The patent optimizes the molecular weight distribution (500-5000 g/mol) and functional group content (acid number 5-50 mg KOH/g) of the polyether-based reaction products to achieve both water solubility and mechanical strength. These precise parameter adjustments allow the aqueous formulation to deliver enhanced stonechip resistance without compromising environmental compatibility.
Solution Approach 2:
The invention develops a composite aqueous system combining carboxy-functional polyether binders with crosslinking agents and reinforcing additives. This composite approach enables the water-based coating to achieve mechanical properties comparable to or exceeding traditional solvent-based systems while maintaining its environmental advantages.
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 the carboxy-functional, polyether-based reaction product in basecoat materials significantly improves the stonechip resistance and adhesion of multicoat paint systems, while being produced in an environmentally friendly aqueous format.
Implementation Method 1
a carboxy-functional, polyether-based reaction product which is preparable by reaction of (a) at least one carboxy-functional component which is preparable by esterification reaction of at least one dihydroxycarboxylic acid (a1) with at least one dicarboxylic acid (a2)
Data Source
AI summary
The present invention relates to a pigmented aqueous basecoat material including a polyether-based reaction product which is preparable by reaction of (a) at least one carboxy-functional component which is preparable by esterification reaction of at least one dihydroxycarboxylic acid (a1) with at least one dicarboxylic acid (a2) and/or the anhydride of a dicarboxylic acid (a2), the components (a1) and (a2) being used in a molar ratio of 0.5/3.0 to 1.7/1.8, with (b) at least one polyether of a general structural formula (I)in which R is a C3 to C6 alkylene radical and n is selected accordingly such that the polyether (b) possesses a number-average molecular weight of 500 to 5000 g/mol, the components (a) and (b) being used in the reaction in a molar ratio of 0.7/2.3 to 1.6/1.7, and the resulting reaction product possessing an acid number of 10 to 50 mg KOH/g.