PU Curing Agent - Effective for Polyurethane Coatings and Finishes
Product Overview
PU Curing Agent is a high-reactivity polyisocyanate crosslinker engineered to optimize the performance of polyurethane coatings, adhesives, and finishes. With a controlled NCO content of 12–18% and adjustable hydroxyl reactivity (equivalent weight: 200–600 g/eq), this curing agent enables precise formulation of 2K polyurethane systems for applications demanding high gloss retention, chemical resistance, and flexible cure profiles. Compatible with polyols, acrylics, and polyester resins, it delivers VOC levels <50 g/L (EPA Method 24) and complies with REACH/TPA regulations, making it ideal for automotive clearcoats, industrial maintenance coatings, and eco-friendly wood finishes.
Technical Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| NCO Content (%) | 12–18 (customizable) | ASTM D2572 |
| Equivalent Weight (g/eq) | 200–600 | ASTM E222 |
| Viscosity (25°C, mPa·s) | 800–2,500 | ISO 2555 (Brookfield RV) |
| Density (g/cm³) | 1.05–1.15 | ASTM D4052 |
| Flash Point (°C) | >100 | ISO 3679 |
| Pot Life (25°C, minutes) | 30–120 (adjustable) | ASTM D2471 |
| Cure Time (Tack-Free) | 15–90 minutes | ASTM D1640 |
| HDI Monomer Content | <0.1% | GC-MS |
| Volatile Organic Content | <50 g/L | EPA Method 24 |
| Color (Gardner Scale) | ≤1 | ASTM D1544 |
| Storage Stability (months) | 6–12 at 15–25°C | ASTM D1849 |
Core Performance Advantages
1. Tailored Reactivity
- Hydroxyl Compatibility:
Resin Type OH Value (mg KOH/g) Cure Speed (T₉₀ @ 25°C) Acrylic Polyol 80–120 45–60 minutes Polyester Polyol 150–200 30–45 minutes Polyether Polyol 30–50 90–120 minutes - Temperature Flexibility:
- Achieves full cure at 5°C (with 0.1% dibutyltin dilaurate catalyst).
2. Enhanced Coating Properties
- Mechanical Durability:
Property Performance Pencil Hardness 3H–4H (ASTM D3363) Crosshatch Adhesion 5B (ASTM D3359) Reverse Impact Resistance 160 in-lb (ASTM D2794) - Chemical Resistance:
Exposure Result MEK Double Rubs >200 (ASTM D5402) 10% H₂SO₄ (7 days) No blistering/discoloration ASTM Oil #3 (24h) ΔGloss <5%
3. Sustainability & Safety
- Low-VOC Profile:
- Formulated with bio-based solvents (30% renewable carbon content).
- Meets CARB 2023 and EU Directive 2004/42/CE compliance.
- Worker Safety:
- TWA exposure limit: <0.005 ppm (NIOSH REL).
- Skin sensitization: OECD 406 compliant (non-sensitizing).
Advanced Formulation Technology
1. Modified Polyisocyanate Chemistry
- Hydrophobic Modification:
- Alkylsilane-grafted HDI trimer for moisture resistance.
- Water tolerance: Up to 5% humidity during curing.
- Low-Monomer Technology:
- Residual HDI monomer reduced to <0.1% via thin-film distillation.
2. Reactivity Control
- Blocked Isocyanates:
- Optional ketoxime-blocked grades for latent curing (activation at 130°C).
| Blocking Agent | Deblocking Temp | Application |
|---------------------------|-----------------------|--------------------------------|
| MEKO | 130°C | Powder coatings |
| ε-Caprolactam | 160°C | Coil coatings |
- Optional ketoxime-blocked grades for latent curing (activation at 130°C).
Application-Specific Solutions
1. Automotive Refinish
- High-Solid Clearcoats:
- Achieves 85% volume solids with 2.5 mil dry film.
- DOI (Distinctness of Image): >90 (ASTM D5767).
- Plastic Substrate Adhesion:
- TPO/PC adhesion: ≥4 MPa (ISO 4624).
2. Industrial Maintenance
- Anti-Corrosive Primers:
Test Performance Salt Spray Resistance 1,500h (ASTM B117, ≤6mm creep) Cyclic Corrosion (Prohesion) 60 cycles (ASTM D5894) - Tank Linings:
- Immersion resistance to diesel/fuel blends (ASTM D1308).
3. Wood Finishes
- UV-Stable Parquet Coatings:
- QUV-A 1,000h: ΔE <1.5.
- Abrasion resistance: 100 cycles (CS-10 wheel, 1kg load).
- Low-Temperature Curing:
- Full cure achieved at 10°C for winter application.
Competitive Comparison
| Property | Our PU Curing Agent | Epoxy Curing Agents | Moisture-Cured PU |
|---|---|---|---|
| Cure Speed | 30–90 minutes | 4–8 hours | 2–6 hours (humidity-dependent) |
| Flexibility | 100% elongation | Brittle (5–10% elongation) | 80–120% elongation |
| Chemical Resistance | Excellent solvents/fuels | Good acids/alkalis | Moderate |
| VOC Emissions | <50 g/L | 100–300 g/L | 0–20 g/L |
| Recoatability | 2–4 hours | 16–24 hours | 6–8 hours |
Sustainability & Compliance
- Certifications:
- ISO 14001 Environmental Management.
- GREENGUARD Gold Certified.
- EU Ecolabel compliance (indoor coatings).
- Circular Economy:
- Compatible with 20% recycled polyol content.
- Degradable via enzymatic hydrolysis (OECD 301B).
Packaging & Logistics
| Package Type | Volume | Features |
|---|---|---|
| Airtight Drums | 25 kg | Nitrogen-purged, UV-protected |
| Intermediate Bulk Container | 1,000 kg | UN-approved, corrosion-resistant |
| Isotanks | 20,000 kg | Temperature-controlled |
Global Stock Availability:
- Europe: Rotterdam Hub – 15 MT ready stock.
- Asia: Singapore FTZ – 25 MT monthly capacity.
- Americas: Chicago Terminal – 10 MT buffer.
Technical Support
- Formulation Assistance:
- Stoichiometric calculators for NCO:OH ratio optimization.
- FTIR analysis for cure degree verification.
- Troubleshooting:
Issue Solution Blushing Reduce humidity during application Poor Flow Leveling Add 0.2–0.5% silicone modifier Bubbling Degas pre-mix, reduce catalyst
Conclusion
PU Curing Agent redefines polyurethane coating performance through precision-engineered reactivity, unmatched durability, and sustainable chemistry. Its customizable NCO content (12–18%), compatibility with diverse resin systems, and low-VOC profile empower formulators to meet stringent industry standards while addressing environmental regulations. Whether for automotive refinish, industrial corrosion protection, or high-end wood finishes, this curing agent delivers rapid cure kinetics, exceptional mechanical properties, and long-term weatherability. Backed by global technical support and ISO-certified manufacturing, it bridges the gap between high-performance coatings and eco-conscious production.
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About Beijing TDD E-commerce Co., Ltd.
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