Waterborne Base Coat Additive System for Gloss Enhancement
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Solution Overview
Problem
Current waterborne base coat compositions with special-effect colors for automotive coatings do not adequately enhance the appearance of the clear coat layer, particularly in terms of gloss and surface structure, when used in base coat/clear coat two-layer coatings.
Innovation Solution
Incorporating a specific additive combination of poly(meth)acrylic acid thickener and non-ionically emulsified EVA copolymer wax with a drop point of 80 to 110° C into waterborne base coats containing aqueous microgel binder, which improves the visual appearance and reduces short wave and dullness of the clear coat surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If waterborne base coat compositions with special-effect colors are used in base coat/clear coat two-layer coatings, then the special-effect color (flop effect) is achieved, but the appearance and gloss of the clear coat layer are not adequately enhanced
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the waterborne base coat, specifically incorporating poly(meth)acrylic acid thickener and non-ionically emulsified EVA copolymer wax with a drop point of 80 to 110° C. These compositional parameter changes result in improved surface structure properties including enhanced gloss and minimized short wave and dullness of the clear coat layer.
Solution Approach 2:
The patent employs composite materials by combining multiple functional additives within the waterborne base coat composition: aqueous microgel binder, poly(meth)acrylic acid thickener, and non-ionically emulsified EVA copolymer wax. This composite additive system works synergistically to achieve both the special-effect color and the enhanced appearance/gloss properties of the clear coat layer.
2Manufacturing precision
If conventional waterborne base coat compositions are applied, then the coating process is simple, but the surface structure exhibits increased short wave and dullness
Solution Approach 1:
The patent merges multiple functional additives into a single integrated waterborne base coat composition. The poly(meth)acrylic acid thickener and non-ionically emulsified EVA copolymer wax are combined within the same composition framework, allowing simultaneous achievement of surface structure improvement (minimized short wave and dullness) and special-effect color without requiring separate processing steps.
Solution Approach 2:
The waterborne base coat composition is formulated to self-enhance the clear coat layer appearance through its inherent additive combination. The specific formulation with poly(meth)acrylic acid thickener and EVA copolymer wax automatically provides gloss enhancement and surface structure improvement when applied, without requiring additional separate treatments or complex post-processing steps.
Data Source
AI summary
A waterborne base coat having a special-effect color and which contains aqueous microgel as binder, 0.5 to 2 wt.-% of poly(meth)acrylic acid thickener and 2 to 7 wt.-% of non-ionically emulsified EVA copolymer wax with a drop point of the wax portion of 80 to 110° C., the wt.-% in each case calculated as solids and relative to the solids content of the waterborne base coat.