Water-borne Base Coatings with Acrylic Polymer Crosslinking
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Solution Overview
Problem
Water-borne base coating compositions with high effect pigment weight concentration suffer from deteriorated gloss and surface smoothness, leading to unsatisfactory finished appearance and water resistance.
Innovation Solution
A water-borne base coating composition containing specific water-dispersible acrylic polymer particles obtained by emulsion polymerization with amido-containing radical-polymerizable unsaturated monomers and effect pigments at a pigment weight concentration of 15-50%, which forms a coating film with improved brilliance, surface smoothness, and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pigment weight concentration of effect pigment is increased to improve brilliance, then brilliance is improved, but gloss and surface smoothness deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling the pigment weight concentration within the specific range of 15-50% and adjusting the solid paint content to 5-20%. These parameter optimizations resolve the contradiction by finding the optimal balance point where sufficient pigment is present to provide brilliance while maintaining enough vehicle to ensure smooth surface formation and gloss.
2Illumination intensity
If pigment weight concentration of effect pigment is increased to improve brilliance, then brilliance is improved, but water resistance deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the solid paint content to 5-20% and pigment weight concentration to 15-50%. This balanced formulation ensures adequate pigment for brilliance while maintaining sufficient resin and vehicle content to provide water resistance and film integrity.
3Manufacturing precision
If solid paint content is increased to improve surface smoothness, then surface smoothness is improved, but brilliance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the solid paint content within the specific range of 5-20%. This controlled solid content ensures sufficient vehicle to carry the effect pigment and provide smooth surface formation, while maintaining adequate pigment concentration to achieve brilliance. The balanced formulation prevents either extreme from dominating.
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 enables the formation of a coating film with enhanced brilliance, surface smoothness, and water resistance by creating three-dimensional crosslinkages within the polymer particles, preventing water infiltration and maintaining film appearance.
Implementation Method 1
water-dispersible acrylic polymer particles (A) which are obtained by emulsion polymerizing a radical-polymerizable unsaturated monomeric mixture including amido-containing, radical-polymerizable unsaturated monomer (M-1) having at least two radical-polymerizable unsaturated groups per molecule
Implementation Method 2
radical-polymerizable unsaturated monomer (M-1) having at least two radical-polymerizable unsaturated groups per molecule
Implementation Method 3
amido-containing, radical-polymerizable unsaturated monomer (M-1) having at least two radical-polymerizable unsaturated groups per molecule, whereby three-dimensional crosslinkages are formed inside the particles
Data Source
AI summary
This invention provides an effect pigment-containing, water-borne base coating composition comprising water-dispersible acrylic polymer particles (A) and effect pigment (B), the water-dispersible acrylic polymer particles (A) being obtained by emulsion polymerization of a radical-polymerizable unsaturated monomeric mixture including an amido-containing, radical-polymerizable unsaturated monomer having at least two radical-polymerizable unsaturated groups per molecule, and the effect pigment (B) being contained at a pigment weight concentration (PWC) within a range of 15-50%.