Water-Borne Multi-Pack Coating for Low-Temperature Hardness and Gloss
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Solution Overview
Problem
Existing water-borne multi-pack type coating compositions are low in hardness, lack glossy texture, and generate spray dust, despite being curable at low temperatures.
Innovation Solution
A water-borne multi-pack type coating composition comprising a first part with a hydroxy group-containing resin and a melamine resin, and a second part with a hydrophilic polyisocyanate compound, where the melamine resin reacts with the polyisocyanate compound at low temperatures to form a crosslinked structure, enhancing hardness and reducing spray dust, while the hydrophilic polyisocyanate compound improves glossy texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a water-borne multi-pack type coating composition is used for low-temperature curing, then energy consumption is reduced and drying property is improved, but the coating film hardness decreases and spray dust increases
Solution Approach 1:
The patent changes the chemical parameters of the coating composition by introducing specific resin combinations (hydroxy group-containing resin with carboxyl group, melamine resin with specific functional group averages) and curing agents (polyisocyanate compounds with hydrophilic groups) to enable low-temperature curing while maintaining film hardness. This resolves the contradiction by modifying the chemical composition parameters rather than simply lowering the curing temperature.
Solution Approach 2:
The patent uses a composite coating system combining multiple resin types (hydroxy group-containing resin and melamine resin) with polyisocyanate curing agents. This composite material approach allows the coating to achieve both low-temperature curability and high film hardness through synergistic interactions between the different components, preventing the hardness reduction that would occur with single-resin systems.
2Use of energy by stationary object
If a water-borne multi-pack type coating composition is used for low-temperature curing, then energy consumption is reduced, but the coating film glossy texture deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters by selecting specific resin types and ratios, along with polyisocyanate curing agents containing hydrophilic groups, to achieve proper film formation and surface smoothness at low temperatures. This prevents the glossy texture deterioration that would otherwise occur during low-temperature curing.
3Ease of operation
If a water-borne multi-pack type coating composition is used, then workability and storage property are improved, but spray dust generation increases
Solution Approach 1:
The patent adjusts the viscosity and composition parameters of the coating material by using specific resin combinations and ratios. This optimization reduces spray dust generation while preserving the workability and storage stability of the water-borne coating system.
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 a coating film with high hardness, superior glossy texture, and reduced spray dust, all while being curable at low temperatures.
Implementation Method 1
the melamine resin reacts with the polyisocyanate compound at low temperatures to form a crosslinked structure
Implementation Method 2
the hydrophilic polyisocyanate compound improves glossy texture
Data Source
AI summary
Provided is a water-borne coating composition capable of forming a coating film having a high hardness, an excellent glossy texture, and reduced spray dust while being curable at low temperatures. The water-borne multi-pack type coating composition includes: a first part including a hydroxy group-containing resin (A) and a melamine resin (B); and a second part including a hydrophilic polyisocyanate compound (D), wherein the hydroxy group-containing resin (A) is at least one of a hydroxy group-containing acrylic resin (A1) and a hydroxy group-containing polyester resin (A2), the melamine resin (B) is dissolved in the first part or has an average particle size of less than 1 µm, and has an average value of a total number of imino groups and methylol groups per triazine ring is more than 1, and the hydrophilic polyisocyanate compound (D) is at least one of an ionically modified polyisocyanate compound (D1) and a nonionically modified polyisocyanate compound (D2).