Liquid Coating Composition with Immobilized Catalyst
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Solution Overview
Problem
Existing liquid coating compositions with polyurethane resin and cure catalysts face challenges in achieving effective crosslinking due to the limitations of catalyst activity at room temperature and solubility issues, which affect storage stability and curing efficiency.
Innovation Solution
A liquid coating composition incorporating a resin system crosslinkable under catalyst D, with solid particles composed of a physical mixture of 70-99 wt.% polyurethane resin C and 1-30 wt.% catalyst D, where the polyurethane resin has a melting temperature of 40-180°C, allowing for immobilized catalyst activity during thermal curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cure catalyst is added to the liquid coating composition to enable crosslinking, then crosslinking efficiency is improved, but storage stability deteriorates due to premature catalyst activity at room temperature
Solution Approach 1:
The catalyst is segmented into discrete solid particles dispersed throughout the liquid coating composition. This segmentation isolates the catalyst in separate phases that only become active when the particles melt during thermal curing, preventing premature catalysis while enabling efficient crosslinking when needed.
Solution Approach 2:
The catalyst particles are designed with a specific melting point range (40-180°C) that changes their physical state from solid to liquid during thermal curing. This parameter change activates the catalyst only at elevated temperatures, resolving the contradiction between storage stability at room temperature and curing efficiency at elevated temperatures.
2Stability of the object's composition
If the catalyst is kept inactive at room temperature to maintain storage stability, then storage stability is improved, but crosslinking efficiency deteriorates due to insufficient catalyst activity
Solution Approach 1:
The catalyst is prepared in advance as solid particles with controlled melting properties and dispersed in the liquid coating composition before application. This preliminary preparation ensures the catalyst remains inactive during storage but is ready to become active immediately when thermal curing begins, eliminating the need for additional activation steps.
Solution Approach 2:
The catalyst utilizes a phase transition from solid to liquid state at a specific melting point range during thermal curing. This phase transition serves as a switch that activates the catalyst only when the coating is heated to curing temperatures, ensuring both storage stability and curing efficiency are maintained.
3Stability of the object's composition
If solid catalyst particles are used to improve storage stability, then storage stability is improved, but mixing and dispersion difficulty increases
Solution Approach 1:
The solid catalyst particles are designed with specific local properties including controlled particle size, surface characteristics, and melting point that facilitate their dispersion in the liquid coating composition. These localized quality adjustments enable effective mixing while maintaining the particles' solid state for storage stability.
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 ensures effective crosslinking and improved storage stability, with the catalyst only displaying activity at elevated temperatures, enhancing the curing process and reducing the required object temperature for thermal curing.
Implementation Method 1
solid particles consisting of a physical mixture of 70 to 99 wt.-% of a polyurethane resin C and 1 to 30 wt.-% of a catalyst D immobilized in said polyurethane resin C, wherein the polyurethane resin C has a melting temperature of 40 to 180°C
Implementation Method 2
a resin system crosslinkable under the catalysis of a catalyst D
Data Source
AI summary
A liquid coating composition which contains (i) a resin system crosslinkable under catalysis of a catalyst D and comprising a binder A and, as an optional component, a crosslinker B for the binder A, and (ii) solid particles CD consisting of a physical mixture of 70 to 99 wt.-% of a polyurethane resin C and 1 to 30 wt.-% of a catalyst D immobilized in said polyurethane resin C, wherein the sum of the wt.-% totals 100 wt.-%, and wherein the polyurethane resin C has a melting temperature of 40 to 180C, measured by DSC at a heating rate of 10 K/min.