IntroductionHydrophilic aliphatic polyisocyanate MT 307/1 is a water-dispersible crosslinking a
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Hydrophilic aliphatic polyisocyanate MT 307/1 is a water-dispersible crosslinking agent specifically designed for aqueous coating systems. This modified polyisocyanate combines excellent weathering stability with enhanced water compatibility, making it particularly suitable for environmentally friendly coating formulations.
| Property | Spécification | Test Method |
|---|---|---|
| Apparence | Clear, pale yellow liquid | Visual inspection |
| NCO content (%) | 12.5±0.5 | ASTM D2572 |
| Viscosity (25°C, mPa·s) | 3000±500 | Brookfield RV |
| Density (20°C, g/cm³) | 1.10±0.02 | ISO 2811 |
| Flash point (°C) | >100 | ISO 2719 |
| Solubility in water | Dispersible | Manual evaluation |
| Resin Type | Compatibility | Pot Life (h, 25°C) | Recommended NCO:OH Ratio |
|---|---|---|---|
| Acrylic polyol dispersion | Excellent | 4-6 | 1.2-1.5:1 |
| Polyester polyol dispersion | Good | 3-5 | 1.3-1.6:1 |
| Polyurethane dispersion | Excellent | 5-7 | 1.1-1.4:1 |
| Alkyd emulsion | Limited | 2-3 | 1.5-1.8:1 |
| Component | Wood Coating (%) | Industrial Coating (%) | Automotive Refinish (%) |
|---|---|---|---|
| Hydroxyl component | 60-70 | 55-65 | 50-60 |
| MT 307/1 | 10-15 | 8-12 | 12-18 |
| Co-solvent | 3-5 | 2-4 | 4-6 |
| Additifs | 1-2 | 1-2 | 1-2 |
| Water | 15-25 | 20-30 | 20-25 |
| Property | Test Method | Typical Value |
|---|---|---|
| Pendulum hardness (s) | ISO 1522 | 120-150 |
| Cross-cut adhesion | ISO 2409 | 0-1 |
| Flexibility (conical mandrel) | ASTM D522 | Pass 4mm |
| MEK resistance (double rubs) | ASTM D5402 | >200 |
| Water resistance (240h) | ISO 2812-2 | No change |
| Weather resistance (QUV-B 1000h) | ASTM G154 | ΔE<2.5 |
Excellent water dispersibility without emulsifiers
Low viscosity for easy processing
Superior yellowing resistance
Good mechanical-chemical property balance
Compatible with various aqueous resin systems
Waterborne wood coatings
Eco-friendly industrial finishes
Automotive refinish systems
Plastic coatings
High-performance DIY coatings
Optimal application temperature: 15-30°C
Recommended curing: 30min@80°C or 7d@25°C
Storage stability: 6 months in original container
Requires mechanical stirring for water dispersion
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