Carboxy-Functional Polyether Reaction Products for Aqueous Basecoats
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Solution Overview
Problem
Current multicoat paint systems lack sufficient stonechip resistance and are not environmentally friendly, as they rely on organic solvents, which are being phased out due to environmental concerns.
Innovation Solution
A carboxy-functional, polyether-based reaction product is used in aqueous basecoat materials, produced by reacting trimesic acid with a polyether of specific molecular weight, to create a pigmented basecoat material that enhances stonechip resistance while being eco-friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If organic solvent-based coating compositions are used, then good stonechip resistance and mechanical stability are achieved, but environmental compatibility deteriorates
Solution Approach 1:
The invention changes the fundamental parameter of the coating composition from organic solvent-based to aqueous-based. This is achieved by using carboxy-functional polyether-based reaction products that are specifically designed to work in water, replacing traditional organic solvents while maintaining film-forming capabilities and mechanical properties including stonechip resistance.
Solution Approach 2:
The invention employs composite material strategies by combining carboxy-functional polyether-based reaction products with specific additives and pigments in an aqueous matrix. This composite approach allows the system to achieve both environmental compatibility (through water-based formulation) and mechanical reliability (through the synergistic combination of binder, additives, and pigments).
2Object-affected harmful factors
If aqueous basecoat materials are used, then environmental compatibility is improved, but stonechip resistance deteriorates
Solution Approach 1:
The invention fundamentally changes the performance parameters of aqueous coatings by using carboxy-functional polyether-based reaction products. These reaction products are specifically engineered to provide adequate film formation, adhesion, and mechanical resistance in water-based systems, thereby improving stonechip resistance while maintaining environmental compatibility.
Solution Approach 2:
The invention applies local quality enhancement by incorporating specific additives and optimizing the molecular structure of the polyether-based reaction products to improve mechanical resistance at critical interfaces (such as the coating-substrate interface and within the coating matrix itself), while the bulk remains aqueous and environmentally friendly.
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 this reaction product in basecoat materials significantly improves the stonechip resistance of multicoat paint systems, maintaining mechanical stability and adhesion while transitioning to aqueous-based, environmentally compatible coatings.
Implementation Method 1
prepar able by reaction of (a) trimesic acid with (b) at least one polyether
Implementation Method 2
forming a polymer film from the coating material applied in stage (1)
Implementation Method 3
forming a polymer film from the coating material applied in stage (1)
Implementation Method 4
curing the basecoat together with the clearcoat
Data Source
AI summary
A pigmented aqueous basecoat material is disclosed. The pigmented aqueous basecoat material includes a polyether-based reaction product which is preparable by a reaction of trimesic acid with at least one polyether of the general structural formula (I)R is a C3 to C6 alkylene radical and n is selected accordingly such that the at least one polyether possesses a number-average molecular weight of 500 to 5000 g/mol. The trimesic acid and the at least one polyether are used in the reaction in a molar ratio of 0.7/2.3 to 1.6/1.7 and the resulting reaction product possesses an acid number of 10 to 50 mg KOH/g.