Ketimine Latent Epoxy Curing Agent Ecure-25,Dormant in Container, Unlocking Ultra-Long Working Life & Moisture-Activated Fast Cure
Product Summary
Shanghai Feimi Materials specializes in the R&D and supply of Ecure-25 Ketimine Latent Epoxy Curing Agent. Operating as a blocked amine hardener, Ecure-25 provides extremely long pot life in closed systems while exhibiting rapid moisture-activated curing once applied and exposed to atmospheric humidity. It is the premier choice for ultra-high solids/solvent-free heavy-duty coatings, marine protective paints, high-build epoxy floorings, and moisture-cured structural sealants.
Product Overview
Developed by Shanghai Feimi Materials, Ecure-25 Ketimine Curing Agent is engineered to resolve the classic tradeoff between long pot life and rapid curing in high-solids epoxy formulations. Formulated via the condensation of primary amines and ketones, Ecure-25 blocks active amine hydrogens to prevent premature reaction with epoxy resins in sealed containers. Upon application, atmospheric moisture hydrolyzes the ketimine back into active primary amines and volatile ketones, triggering a rapid crosslinking reaction. This moisture-curing mechanism drastically lowers formulation viscosity, extends working life for processing, and achieves fast film throughput—making it an ideal latent hardener for eco-friendly, low-VOC, high-performance protective systems.
Product Advantages
- Extended Pot Life & Superior Shelf Stability.Remains completely latent and low in viscosity in closed, moisture-free containers, dramatically extending application pot life and reducing material waste.
- Moisture-Triggered Rapid Activation.Hydrolyzes rapidly upon contact with ambient humidity after coating application, releasing active amine groups to achieve fast surface drying and full mechanical cure.
- Dramatically Lowered Formulation Viscosity.Acts as a reactive viscosity reducer in high-solids or solvent-free epoxy systems, allowing higher filler loading and easier sprayability without high solvent content.
- Exceptional Film Integrity & Chemical Resistance.Eliminates amine blush and moisture sensitivity issues during application; produces cured films with high gloss, exceptional adhesion, corrosion resistance, and toughness.
- Patented Process & Consistent Batch Supply.Manufactured using precise synthesis and dehydration control systems to ensure low residual free amine levels and high batch-to-batch consistency. Custom grades are available to suit specific humidity and process targets.
Typical Properties
| 项目 / Parameter | Ecure-25 指标 |
|---|---|
| 外观 Appearance | 黄色或棕色液体 Yellow or brown liquid |
| 密度 Density（25℃）g/cm3 | 0.875 |
| 粘度 Viscosity（25℃）mPa.s | 4~15 |
| 活泼氢当量 AHEW wt/[H] | 55 |
| 推荐用量 Recommended uee level (NPEL128:Ecure-25) | 100:30 |
| 可操作时间 Potlife（h） | 7~8 |
Product Applications
- Ultra-High Solids & Solvent-Free Anti-Corrosion CoatingsHeavy-duty anti-corrosion primers for marine vessels, offshore structures, storage tanks, and industrial steelwork.
- High-Build Epoxy Flooring SystemsThick-film self-leveling floors and high-gloss protective topcoats requiring extended working time and smooth surface finish.
- Moisture-Cured Adhesives & SealantsSingle-component (1K) or extended pot-life 2K epoxy adhesives for construction joints, stone bonding, and automotive assembly.
- High-Volume Spray OperationsIndustrial machinery coatings and coil coatings where long pot life in spray guns and rapid drying on conveyors are required.
Handling, Storage & Expiry
- Handling & Safety Instructions: Refer to the Safety Data Sheet (SDS / MSDS). Ensure equipment and raw materials are moisture-free prior to blending.
- Shelf Life & Storage Conditions:12 months from manufacture in original, sealed, airtight containers.Store in a cool, dark, dry place (10°C-30°C). Nitrogen purging is recommended after opening to prevent atmospheric moisture contamination.
FAQ
- Q1: How does Ecure-25 ketimine curing agent work in a moisture-cured epoxy system?A: Ecure-25 is formed by reacting primary amines with ketones to temporarily "block" the reactive amine hydrogen atoms. In a sealed container, it remains inactive and maintains a very low viscosity with epoxy resins. Once applied as a film, it absorbs ambient moisture (H2O) from the air, releasing the ketone and unblocking active primary amine groups, which then rapidly crosslink with the epoxy resin.
- Q2: Does relative humidity (RH) affect the cure rate of Ecure-25?A: Yes. Since the unblocking mechanism relies on ambient moisture, cure rate is positively correlated with relative humidity. At standard ambient conditions (25°C, 50%–75% RH), Ecure-25 cures rapidly. In extremely dry or desert environments (< 20%RH), forced humidification or co-curing accelerators may be recommended.
- Q3: What precautions should be taken when formulating with Ecure-25?A: All solvents, pigments, and fillers used in the formulation must be thoroughly dried and free of water to prevent premature activation during storage. Packaging containers should be purged with dry nitrogen before sealing. Shanghai Feimi Materials provides full technical support for moisture-control formulation design.
