HD-1020 is a specialty silane-modified aliphatic isocyanate curing agent based on hexamethylene diisocyanate (HDI). Through silane hybridization technology, it offers enhanced adhesion and stability. This product is designed for high-performance coatings and inks, retaining the typical non-yellowing, weather resistance, and solvent resistance of HDI while significantly improving adhesion to various difficult-to-bond substrates. It effectively resists moisture, heat, salt spray, and chemical attack. Its clear, transparent liquid form and moderate viscosity allow for easy incorporation into two-component systems, making it suitable for high-performance applications in the aerospace, automotive, and construction industries.
Key Features
Excellent Adhesion: Silane modification introduces reactive groups that form strong chemical bonds with special substrates such as glass, metal, and ceramics, significantly enhancing dry film adhesion and wet film stability.
Superior Weather Resistance: Based on an aliphatic HDI structure, the cured film resists yellowing upon prolonged UV exposure, maintaining vibrant color and making it suitable for demanding outdoor environments.
High Chemical Resistance: The cured film exhibits excellent resistance to moisture, heat, salt spray, and various chemical solvents, extending the service life of the substrate.
Good Pigment Wetting: In pigment-containing systems like UV inks, it effectively wets pigments, improving color development and system stability.
Moderate NCO Content: With an isocyanate group content of 20%, it provides a balanced crosslinking density and pot life, adapting to various application processes.
Technical Specifications
| Property | Typical Value |
|---|---|
| Appearance | Clear liquid |
| Viscosity (25°C, cPs) | 200 |
| Molecular Weight (GPC) | 150 |
| Melting Point (°C) | -62 |
| Boiling Point (°C) | 269 |
| Refractive Index | 1.451 |
| Density (g/cm³, 25°C) | 1.05 |
| NCO Content (%) | 20 |
Applications
1. Two-Component (2K) High-Performance Coatings
HD-1020 is widely used in aerospace, automotive, and industrial protective coatings. It combines with hydroxyl-containing resins (such as acrylics and polyesters) to form dense films. It is particularly suitable for substrates demanding high adhesion, such as aluminum alloys, galvanized steel, glass, and composite materials, providing long-term protection and aesthetic appeal.
2. UV Inks and Coatings
In UV-curable systems, HD-1020 combines the crosslinking function of isocyanates with the pigment affinity of silanes. It improves ink adhesion to various substrates while enhancing the scratch and solvent resistance of the ink layer. Suitable for formulations with high pigment loading, it contributes to vibrant color and consistent printing performance.
Usage Recommendations
Mixing Ratio: Calculate the required amount of curing agent based on the hydroxyl content of the resin in the formulation to ensure an appropriate NCO/OH ratio.
Compatibility: Test compatibility with the main resin, solvents, and other additives before use to avoid haziness or gelling.
Storage: Keep sealed in a cool, dry place. Avoid exposure to moisture to prevent deactivation of NCO groups.
Packaging and Storage
Packaging: Available in 200 kg iron drums or 20 kg plastic drums (customizable).
Storage Conditions: Recommended storage temperature is 5–30°C. Keep away from moisture and heat sources.
Shelf Life: 12 months in original, unopened packaging.
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