Aqueous Binder Composition for High-Gloss Low-VOC Coatings
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Solution Overview
Problem
Existing aqueous binder compositions for paints, particularly high-gloss varnishes, fail to achieve the desired level of gloss and surface smoothness while meeting environmental requirements for low volatile organic compounds (VOC) content.
Innovation Solution
An aqueous binder composition comprising an emulsion polymer with specific monomer components, a water-soluble alkyd resin, and an alkyd resin in an aqueous emulsion, with a solids content less than 60% by weight, optimized to provide high gloss and low gloss haze, along with high hiding power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based systems are used to reduce VOC content, then environmental compliance is improved, but gloss and surface smoothness deteriorate
Solution Approach 1:
The patent combines three different binder types (emulsion polymer, water-soluble alkyd resin, and aqueous emulsion alkyd resin) to create a composite aqueous binder system. This composite approach allows the formulation to achieve high gloss and surface smoothness comparable to solvent-based systems while maintaining water-based environmental benefits. Each binder component contributes different properties that complement each other to resolve the contradiction between environmental compliance and surface quality.
Solution Approach 2:
The patent specifies precise parameter ranges for each binder component, including molecular weight ranges (5000-40000 Da for water-soluble alkyd, >100000 Da for aqueous emulsion alkyd), solid content (20-60%), and formulation ratios. By optimizing these parameters, the aqueous system achieves surface properties previously only attainable with solvent-based systems, resolving the gloss and smoothness deterioration issue.
2Manufacturing precision
If high molecular weight alkyd resin is used to improve film formation, then surface smoothness is improved, but viscosity increases
Solution Approach 1:
The patent divides the alkyd resin component into two separate binder types with different molecular weights: water-soluble alkyd resin (5000-40000 Da) and aqueous emulsion alkyd resin (>100000 Da). This segmentation allows the low molecular weight component to provide flow and handling properties while the high molecular weight component provides film formation and surface smoothness, resolving the viscosity contradiction.
Solution Approach 2:
Different binder components are assigned different functional roles based on their molecular weight characteristics. The water-soluble alkyd resin with lower molecular weight provides ease of application and lower viscosity, while the aqueous emulsion alkyd resin with higher molecular weight specifically targets film formation and surface smoothness. This local quality differentiation resolves the contradiction between viscosity and surface smoothness.
3Manufacturing precision
If emulsion polymer with specific monomers is used to enhance gloss, then surface finish is improved, but formulation complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the emulsion polymer composition, including monomer ratios (50-98% main monomers, 2-20% formula I or II monomers, 0-40% further monomers), glass transition temperature (<50°C, preferably <30°C), and solid content (20-60%). By defining these parameters, the patent simplifies the formulation process while achieving high gloss, as manufacturers can select from a range of compliant materials without needing to develop custom formulations.
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 high gloss and low haze, exceeding the performance of solvent-based alkyd resin paints and commercially available dispersion paints, while maintaining low VOC content and easy handling.
Implementation Method 1
at least one emulsion polymer containing as monomer building blocks a C 1 -C 8 alkyl (meth)acrylate, a vinyl aromatic compound with up to 20 carbon atoms or mixtures thereof
Implementation Method 2
The alkyd resin (b) with a weight-average molecular weight between 5000 and 40,000 Da and (c) at least one alkyd resin with a weight-average molecular weight greater than 100,000 Da in the form of an aqueous emulsion
Data Source
AI summary
The present invention relates to an aqueous binder composition comprising (a) at least one emulsion polymer comprising a C1-C8-alkyl (meth)acrylate, a vinylaromatic compound having up to 20 carbon atoms or mixtures thereof as monomer building blocks (b) at least one water-soluble alkyd resin having a weight average molecular weight in the range from 5000 to 40 000 Da and (c) at least one alkyd resin having a weight average molecular weight of greater than 100 000 Da in the form of an aqueous emulsion, characterized in that the solids content of the mixture of (a), (b) and (c) is less than 60% by weight, and also its use and production.