Epoxy Resin Composition for Rapid Low-Temperature Curing
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Solution Overview
Problem
Current epoxy resin compositions for fiber-reinforced composite materials require lengthy curing processes, increasing production costs and failing to meet heat resistance and mechanical characteristics needed for aerospace and automotive applications, while also having short pot lives.
Innovation Solution
An epoxy resin composition combining an epoxy resin with at least three glycidyl groups, an epoxy resin with a sulfur atom, and an imidazole compound, specifically 2-phenyl-4,5-dihydroxymethylimidazole, which allows for low-temperature high-speed curability, extended pot life, and excellent heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If general 180°C-curable epoxy resins are used, then excellent heat resistance and mechanical characteristics are achieved, but the curing time is prolonged and production cost increases
Solution Approach 1:
The patent changes the chemical parameters of the epoxy resin system by incorporating epoxy resins with specific structural features (aromatic rings, sulfur atoms) and selecting imidazole compounds with specific substituents (phenyl, hydroxymethyl, methyl groups). These parameter changes enable the resin to cure rapidly at lower temperatures while maintaining the heat resistance and mechanical properties of traditional 180°C-curable epoxies.
2Loss of time
If rapid curing at 150°C for 30 minutes is achieved, then production time is reduced, but the cured product fails to achieve required heat resistance and mechanical characteristics
Solution Approach 1:
The patent creates a composite epoxy resin system combining multiple epoxy resin components with distinct structural features: aromatic rings for heat resistance, sulfur atoms for crosslinking density, and specific imidazole compounds for catalytic activity. This composite material approach enables simultaneous achievement of rapid low-temperature curing and high-performance cured products meeting aerospace and automotive requirements.
3Productivity
If low-temperature high-speed curability is achieved, then production efficiency increases, but pot life becomes short
Solution Approach 1:
The patent achieves dynamic control of the curing process by using imidazole compounds that provide moderate initial reactivity at room temperature (maintaining pot life) while enabling rapid curing when heated to 150°C. The specific imidazole structure with phenyl, hydroxymethyl, and methyl substituents creates a dynamic reaction system that adapts its curing rate to temperature conditions, ensuring both extended pot life and fast production cycling.
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 rapid curing at 150°C, maintaining viscosity and heat resistance, with a glass transition point of 180°C or higher and a pot life of four weeks or longer, reducing production costs and meeting stringent application requirements.
Implementation Method 1
an imidazole compound (C) including at least one of 2-phenyl-4,5-dihydroxymethylimidazole... and 2-phenyl-4-methyl-5-hydroxymethylimidazole
Implementation Method 2
an epoxy resin composition that has a long pot life despite having low-temperature high-speed curability
Implementation Method 3
an epoxy resin (B) having at least one sulfur atom in the molecule
Data Source
AI summary
This epoxy resin composition contains an epoxy resin (A) having at least three glycidyl groups in the molecule, an epoxy resin (B) having at least one sulfur atom in the molecule, and an imidazole compound (C) containing at least one of 2-phenyl-4,5-dihydroxymethyl imidazole and 2-phenyl-4-methyl-5-hydroxymethyl imidazole.