Epoxy Curing Agent C-16 - Fast and Reliable Curing for Epoxy Coatings
Product Overview
Epoxy Curing Agent C-16 is a low-viscosity, cycloaliphatic amine adduct engineered to accelerate epoxy resin curing while maintaining exceptional mechanical and chemical resistance. Designed for industrial maintenance, composite manufacturing, and high-build coatings, this hardener achieves full cure in 90–180 minutes at ambient temperatures (20–25°C), reducing downtime by 60% compared to traditional polyamide systems. Compatible with bisphenol-A/F, novolac, and hybrid epoxy resins, it delivers glass transition temperatures (Tg) up to 145°C and pencil hardness ≥4H (ASTM D3363). Ideal for fast-turnaround projects in marine, automotive, and infrastructure sectors, C-16 meets NACE SP0188 and ISO 12944-5 standards for corrosion protection while maintaining VOC content <50 g/L.
Core Technical Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | Clear amber liquid | Visual |
| Viscosity @25°C | 800–1,200 mPa·s | ASTM D2196 |
| Amine Value | 240–260 mg KOH/g | ASTM D2074 |
| Density @20°C | 1.08–1.12 g/cm³ | ISO 2811 |
| Mix Ratio (Resin:Hardener) | 2:1 to 3:1 by weight | – |
| Pot Life @23°C | 45–60 minutes (100g mass) | ASTM D2471 |
| Tack-Free Time | 90–120 minutes | ASTM D1640 |
| Full Cure Time | 6–8 hours (7d @23°C for ultimate properties) | ISO 9113 |
| Shore D Hardness | 85–88 (7d cure) | ISO 868 |
| Heat Distortion Temp (HDT) | 120–145°C | ISO 75 |
Advanced Curing Mechanism
1. Accelerated Polymerization
- Kinetic Enhancement:
- Tertiary amine catalysis reduces gel time by 40% vs. DETA-based systems.
- Exothermic peak at 12–15 minutes ensures rapid crosslinking initiation.
- Low-Temperature Performance:
- Achieves 80% cure @10°C within 24h (DSC verified).
- Maintains 95% tensile strength after thermal cycling (-40°C↔80°C).
2. Network Architecture Optimization
- Crosslink Density: 6.5×10⁻³ mol/cm³ (DMA analysis).
- Free Volume Reduction:
- Water vapor transmission rate (WVTR): <5 g/m²/day (ASTM E96).
- Chloride ion penetration: 0.15 kg/m² (ASTM C1543).
Performance Advantages vs. Conventional Hardeners
| Property | C-16 | Polyamide 650 | Phenalkamine |
|---|---|---|---|
| Cure Speed @25°C | 6h full cure | 24–48h | 12–18h |
| Chemical Resistance | 30d immersion in 10% H2SO4: No blistering | Blistering after 7d | Edge lifting after 14d |
| Adhesion to Steel | 22 MPa (ASTM D4541) | 18 MPa | 15 MPa |
| Gloss Retention | 95% after 1,000h QUV-B | 80% | 70% |
| Overcoat Window | 16–72h | 48h–14d | 24h–7d |
Formulation Guidelines
1. Resin Compatibility Matrix
| Epoxy Type | Recommended Mix Ratio | Key Benefit |
|---|---|---|
| Bisphenol-A (EEW 190) | 100:33 | Optimal flow for spray application |
| Bisphenol-F (EEW 170) | 100:38 | High chemical resistance |
| Novolac (EEW 210) | 100:29 | Thermal stability >150°C |
| Flexible Epoxy (EEW 400) | 100:16 | Impact resistance enhancement |
2. Viscosity Modulation Additives
- Thixotropy Control:
- 0.5–1.5% fumed silica (Aerosil® 200) for vertical surface retention.
- 5–10% glass flakes (300μm) for sag resistance in DFT >500μm.
- Flow Enhancement:
- 1–3% BYK-307 surfactant for substrate wetting.
- 5% propylene carbonate for brush application smoothing.
Industry-Specific Applications
I. Industrial Flooring Systems
- Heavy Machinery Facilities
- DFT: 3–5mm per layer, intercoat adhesion >18 MPa.
- Abrasion resistance: CS-10 wheel, 100 cycles, <50mg loss.
- Food Processing Plants
- FDA 21 CFR 175.300 compliant.
- Withstands daily hot pressure washing (80°C/30psi).
II. Composite Manufacturing
| Reinforcement | Curing Protocol | Mechanical Properties |
|---|---|---|
| Carbon Fiber (UD) | 2h @80°C + 2h @120°C | Tensile strength: 3,800 MPa |
| Fiberglass (Biaxial) | 4h @60°C | Flexural modulus: 25 GPa |
| Kevlar Honeycomb | Vacuum bag @40°C for 8h | ILSS: 45 MPa |
III. Marine & Offshore Coatings
- Ballast Tank Protection:
- PSPC compliance with 15-year service life.
- Cathodic disbondment <3mm after 28d (ASTM G8).
- Splash Zone Applications:
- Passes 25-cycle ISO 20340 testing (-20°C↔60°C).
- Icephobic surface reduces ice adhesion by 35%.
Safety & Handling Protocols
1. Personal Protective Equipment (PPE)
- Mandatory: Nitrile gloves (0.11mm), chemical goggles, Tyvek® suits.
- Ventilation: LEV system maintaining <50% LEL (Lower Explosive Limit).
2. First Aid Measures
- Skin Contact: Wash with soap/water, apply dimethicone barrier cream.
- Eye Exposure: Flush with water for 15min, seek ophthalmologist.
- Inhalation: Move to fresh air, administer oxygen if necessary.
Environmental & Regulatory Compliance
1. Eco-Profile
- Biodegradability: 78% OECD 301F (28d).
- VOC Content: 45 g/L (EPA Method 24).
- Carbon Footprint: 2.1 kg CO₂eq/kg (cradle-to-gate).
2. Global Certifications
- REACH: Registered for EU/UK markets.
- GHS Classification: Skin Sensitization Category 1B.
- Marine Approval: IMO MSC.215(82) Annex 1.
Packaging & Storage
| Package Type | Volume | Shelf Life |
|---|---|---|
| Metal Pails | 20 kg | 24 months |
| HDPE Drums | 200 kg | 24 months |
| ISO Tanks | 20,000 kg | 36 months |
- Storage Conditions:
- Temperature: 5–30°C (41–86°F).
- Humidity: <70% RH.
- Avoid direct sunlight and oxidizing agents.
Technical Support Services
- Cure Optimization: DSC analysis for custom temperature profiles.
- Failure Analysis: FTIR spectroscopy for contamination detection.
- Training: On-site application workshops for spray technicians.
Competitive Advantages
- Dual-Function Chemistry: Self-catalyzing amine groups eliminate need for accelerators.
- Universal Compatibility: Stable with solvent-borne, water-based, and 100% solids systems.
- Color Stability: ΔE<1.0 after 2,000h Xenon arc exposure.
- Low Exotherm: Maximum ΔT 52°C in 100mm³ mass prevents thermal cracking.
Conclusion
Epoxy Curing Agent C-16 revolutionizes epoxy system performance through intelligent molecular design that balances speed, strength, and sustainability. By accelerating cure times without compromising film integrity, it enables manufacturers to achieve unprecedented productivity in protective coatings, composite layups, and industrial adhesives. Validated in extreme environments from Arctic oil rigs to tropical chemical plants, C-16 delivers reliable, long-term protection while meeting stringent global environmental regulations. Backed by 24/7 technical support and batch-to-batch consistency (Cpk≥1.67), it stands as the smart choice for professionals seeking to optimize their epoxy processes.
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About Beijing TDD E-commerce Co., Ltd.
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