Key Features
- Latent at ambient temperature — no cure activity until heated
- Excellent catalyst efficiency above 100°C (very low dose required)
- Solid form for safe handling — low vapor pressure vs. liquid amines
- Synergistic with DICY for one-component epoxy systems
- Industry standard for FR4 PCB and powder coating applications
2-Methylimidazole (2-MI) is a solid imidazole accelerator and latent curing catalyst for epoxy resin systems, providing delayed activation at ambient temperature but excellent cure efficiency above 100°C. Imidazoles are recognized as among the most efficient epoxy accelerators, generating a single imidazole molecule capable of catalyzing thousands of epoxy ring-opening events through a chain-growth anionic mechanism before being quenched. 2-MI is widely used in epoxy powder coatings, B-staged prepreg systems, DICY-based one-component epoxy adhesives, and printed circuit board laminate (FR4/G10) formulations where latency (no reaction at ambient) combined with fast cure at 150–180°C is required. At typical loadings of 0.5–3 phr on epoxy resin, 2-MI provides a latent system stable at room temperature for weeks to months and capable of achieving full cure in 15–30 minutes at 150–180°C. 2-MI is a white solid with low vapor pressure, providing safer handling than liquid tertiary amines. It acts in synergy with DICY in one-component epoxy systems.
Specifications
| Parameter | Value |
|---|---|
| Purity | ≥98% |
| Appearance | White to off-white crystalline powder |
| Shelf Life | 24 months in sealed container |
| Melting Point | 142–147°C |
| Typical Loading | 0.5–3 phr on epoxy |
| Activation Temperature | >100°C |
Applications
FAQ
2-MI is a solid with a melting point of 142–147°C and limited dissolution in liquid epoxies at ambient temperature. At room temperature, its ring nitrogen is relatively inactive toward epoxy ring opening. Above 100°C, 2-MI dissolves into the epoxy melt and the imidazole's nucleophilic nitrogen becomes active, initiating anionic polymerization. The combination of physical latency (low dissolution at ambient) and thermal activation gives 2-MI an effective latency at room temperature.
Direct Contact
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