Two-Pack Coating Composition for Open Press Application
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Solution Overview
Problem
Conventional coating compositions, such as room temperature-curable and thermosetting coatings, face inefficiencies in production time and heat resistance issues, while spray coating methods pose environmental concerns due to solvent release, necessitating a coating composition suitable for alternative methods like open press coating.
Innovation Solution
A two-pack coating composition comprising a hydroxyl group-containing main resin and an isocyanate-based hardener, with specific polyol and curing catalyst components, allowing for rapid curing and reduced solvent usage, suitable for open press coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If room temperature-curable coating compositions are used, then energy consumption is reduced and heat resistance issues are avoided, but production efficiency deteriorates due to long drying time
Solution Approach 1:
The patent changes the chemical parameters of the coating composition by using a polyol with high hydroxyl value (200-1900 mg KOH/g) and controlling the NCO/OH equivalent ratio (0.5-2.0), which enables the coating to cure rapidly at room temperature without requiring high energy input or prolonged drying time
Solution Approach 2:
The patent creates a composite coating system combining specific polyol (A) with hydroxyl value in controlled range, isocyanate compound (B), and curing catalyst (C) at optimized content (0.05-3 parts by mass based on 100 parts polyol), forming a multi-component reactive coating composition that achieves both low energy consumption and high productivity
2Ease of operation
If spray coating with organic solvent is used, then coating application is simplified, but environmental harm increases due to solvent release to atmosphere
Solution Approach 1:
The patent changes the solvent content parameter by limiting organic solvent to 5 parts by mass or less based on 100 parts by mass of the two-pack coating composition, dramatically reducing volatile organic compound emissions while preserving coating application performance
Solution Approach 2:
The patent extracts and removes excess organic solvent from the coating composition, transitioning from high-solvent spray coating formulations to a low-solvent reactive coating system that minimizes environmental harm while maintaining ease of application
3Productivity
If thermosetting coating compositions are used, then production efficiency is improved through faster curing, but article deformation occurs due to high temperature heating requirement
Solution Approach 1:
The patent changes the curing temperature parameter by enabling the coating to cure at room temperature through the reactive chemistry between polyol (A) and isocyanate compound (B), eliminating the high-temperature heating step that causes article deformation while maintaining fast curing speed and high productivity
Solution Approach 2:
The patent replaces the thermal curing mechanism (heating) with a chemical curing mechanism (reactive polymerization between hydroxyl groups and isocyanate groups catalyzed by curing catalyst (C)), substituting mechanical/thermal energy with chemical energy to achieve curing without high temperature
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 rapid curing and improved adhesion, suitable for open press coating, reducing production time and environmental impact, while maintaining good appearance and physical properties of the coating layer.
Implementation Method 1
mixing these agents causes a chemical reaction with each other, and a curing reaction proceeds
Implementation Method 2
a curing catalyst (C)... mixing these agents causes a chemical reaction with each other, and a curing reaction proceeds
Data Source
AI summary
Provided is a coating composition that can be suitably used even in a coating method different from conventional spray coating. A two-pack coating composition comprising a main resin comprising a hydroxyl group-containing component and a curing catalyst (C), and a hardener comprising an isocyanate compound (B), wherein the hydroxyl group-containing component comprises a polyol (A), the polyol (A) has a hydroxyl value of 200 mg KOH/g or more and 1900 mg KOH/g or less, a content of the curing catalyst (C) is in a range of from 0.05 parts by mass to 3 parts by mass based on 100 parts by mass of the hydroxyl group-containing component, and an amount of an organic solvent contained in the two-pack coating composition is 5 parts by mass or less based on 100 parts by mass of the two-pack coating composition.