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Low-viscosity aliphatic polyisocyanate trimer offering excellent storage stability and handling safety.
Non-yellowing performance ideal for high-gloss, weather-resistant topcoats and clearcoats.
Reactive NCO content optimized for balanced pot life and rapid film formation at ambient or forced-dry conditions.
Compatible with a wide range of hydroxyl-functional resins including polyesters, acrylics, and polyethers.
Compliant with major global VOC regulations when formulated in solventborne and high-solids coating systems.
Automotive refinish clearcoats and basecoats requiring long-term UV resistance and gloss retention.
Industrial maintenance coatings for machinery, rail vehicles, and agricultural equipment.
Powder coating hybrid systems where improved flow and edge coverage are critical.
High-performance wood coatings for furniture and interior architectural millwork.
Plastic coatings for automotive trim, electronics housings, and consumer goods.
| Chemical Type | Aliphatic HDI-based trimer |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow, transparent liquid |
| NCO Content (wt %) | 18.5 – 19.5% |
| Viscosity (25 °C, mPa·s) | 800 – 1,200 |
| Density (20 °C, g/cm³) | 1.16 – 1.18 |
| Flash Point (PMCC, °C) | 135 – 145 |
| Primary Applications | Two-component polyurethane coatings |
Q1: What is the primary function of Desmodur N 75 BA in coating and adhesive formulations?
A: Desmodur N 75 BA is a low-viscosity, aliphatic HDI trimer-based polyisocyanate curing agent designed to react with hydroxyl-functional resins (e.g., polyesters, acrylics, or polyethers) to form durable, weather-resistant thermoset coatings and high-performance adhesives.
Q2: How does Desmodur N 75 BA differ from other HDI trimer products like Desmodur N 3390 or N 3600?
A: Desmodur N 75 BA contains a benzoic acid catalyst to suppress premature gelation and improve pot life stability, especially in solventborne systems. It offers enhanced storage stability and reduced sensitivity to moisture compared to non-catalyzed HDI trimers, while maintaining excellent yellowing resistance and mechanical performance.
Q3: Is Desmodur N 75 BA suitable for two-component (2K) waterborne systems?
A: While primarily optimized for solventborne and high-solids 2K polyurethane systems, Desmodur N 75 BA can be used in select waterborne hybrid formulations—typically with careful formulation design, appropriate dispersibility aids, and controlled mixing conditions. Compatibility testing is strongly recommended prior to full-scale implementation.
Q4: What are key handling and storage recommendations for this product?
A: Store in tightly sealed containers under dry, cool conditions (ideally below 30 °C) and protect from moisture, heat, and direct sunlight. Avoid prolonged exposure to ambient humidity during handling, as isocyanates are moisture-sensitive. Use only with appropriate personal protective equipment (PPE), including chemical-resistant gloves and respiratory protection when aerosols or vapors may be generated.
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E-mail: wangxingqiang@ericwchem.com
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