Three-Component Coating Composition for Low-VOC Multicolor Molding
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Solution Overview
Problem
Conventional two-component coating compositions with low VOC content face challenges in multicolor applications, requiring significant labor for equipment cleaning and prone to color unevenness and reduced hardness and adhesion.
Innovation Solution
A three-component coating composition kit comprising a main agent, curing agent, and pigment paste, with controlled viscosities within specific ranges, allowing for easy mixing and uniform film formation, reducing cleaning labor and color unevenness while maintaining hardness and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a two-component coating composition with low VOC content is used, then the environmental load is reduced, but the labor required for cleaning coating equipment increases when changing colors
Solution Approach 1:
The coating system is divided into three separate components: main agent (A), curing agent (B), and pigment paste (C). This segmentation allows the pigment to be isolated in a separate paste component with high solid content concentration (90-98 mass%), which facilitates easier cleaning of coating equipment when changing colors, while the main agent and curing agent can be optimized for low VOC content.
Solution Approach 2:
The invention changes the parameter of solid content concentration in the pigment paste to be within 90-98 mass%, and controls the viscosity ratio between main agent and pigment paste (VA/VC) to be 0.5-5.0. These parameter changes enable the pigment paste to be easily cleaned from equipment while maintaining low VOC content in the overall coating composition.
2Device complexity
If a two-component coating composition is used, then the composition is simplified, but color unevenness and reduced hardness and adhesion occur
Solution Approach 1:
By segmenting the coating system into three components with the pigment isolated in a separate paste component, the invention achieves more uniform color distribution in the final coating film. The controlled viscosity ratio (VA/VC = 0.5-5.0) ensures proper mixing and uniform dispersion of pigment, eliminating color unevenness while maintaining reasonable system complexity.
Solution Approach 2:
The invention creates a composite three-component coating system combining main agent (A), curing agent (B), and pigment paste (C). This composite structure allows each component to be optimized for its specific function, resulting in improved color uniformity, hardness, and adhesion compared to simpler two-component systems.
3Object-affected harmful factors
If a coating composition with low VOC content is used, then environmental performance is improved, but hardness and adhesion of the coating film are reduced
Solution Approach 1:
The invention changes the chemical composition parameters by selecting specific isocyanate reactive group-containing compounds (a1 and c1) with appropriate molecular weights (250-2500) and functional groups (hydroxyl, carboxyl, amino). These parameter changes enable the formation of strong crosslinked networks that provide high hardness and adhesion while maintaining low VOC content through the high solid content paste formulation.
Solution Approach 2:
The three-component composite system combines main agent (A), curing agent (B), and pigment paste (C) to create a coating formulation that achieves both low VOC content and high performance. The composite structure allows for optimized crosslinking density and pigment dispersion, resulting in improved hardness and adhesion compared to conventional low VOC coatings.
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 kit enables efficient cleaning process during color changes, forms a coating film with excellent hardness and adhesion, and minimizes color unevenness, even with low VOC content.
Implementation Method 1
a main agent (A) containing an isocyanate reactive group-containing compound (a1); a curing agent (B) containing a polyisocyanate compound (b1)
Implementation Method 2
a coating composition is applied to the surface of the substrate, and the formed wet coating film is cured to form a coating film
Data Source
AI summary
The purpose of the present invention is to provide a kit for a three-component coating composition that has a low VOC content, is capable of shortening a process required for cleaning a coating device when performing multi-coloring, has excellent hardness and adhesion, and makes it possible to form a coating film in which uneven coloring is suppressed. The present invention relates to a kit for a three-component coating composition including (A) a main agent containing (a1) an isocyanate-reactive group-containing compound, (B) a curing agent containing (b1) a polyisocyanate compound, and (C) a pigment paste containing (c1) an isocyanate-reactive group-containing compound and (c2) a pigment, wherein the viscosity (VA) of the main agent (A) under specific conditions is in the range of 20-1,800 mPa·s, the viscosity(VB) of the curing agent (B) under specific conditions is in the range of 20-1,800 mPa·s, and the viscosity (VC) of the pigment paste (C) under specific conditions is in the range of 20-1,800 mPa·s.