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Aliphatic isocyanate-based curing agent offering excellent UV stability and color retention.
Low viscosity enables easy handling, precise metering, and homogeneous mixing with hydroxyl-functional resins.
Fast-reacting at ambient temperature, supporting efficient production cycles without forced curing.
Provides outstanding chemical resistance, including to solvents, acids, and alkalis, in cured films.
Complies with REACH and meets stringent VOC regulations for industrial coating systems.
High-performance automotive clearcoats and basecoats requiring gloss retention and weatherability.
Industrial maintenance coatings for machinery, metal structures, and offshore equipment.
Architectural coatings for façades, aluminum composite panels (ACP), and metal cladding systems.
Plastic coatings for exterior automotive trim and durable consumer electronics housings.
Wood coatings for premium furniture and interior joinery demanding hardness and clarity.
| Chemical Type | Aliphatic polyisocyanate (hexamethylene diisocyanate–based) |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt %) | 15.5 – 16.5 |
| Viscosity at 25 °C (mPa·s) | 300 – 500 |
| Density at 20 °C (g/cm³) | 1.18 – 1.22 |
| Flash Point (PMCC, °C) | 120 – 130 |
| Storage Stability (unopened, 25 °C) | ≥ 12 months |
Q1: What is the primary chemical nature of Desmodur IL 1451?
A: Desmodur IL 1451 is an aliphatic polyisocyanate-based curing agent, specifically formulated as a low-viscosity, bi-functional isocyanate with high reactivity toward hydroxyl groups in polyol systems.
Q2: Is Desmodur IL 1451 suitable for UV-stable, outdoor coating applications?
A: Yes — as an aliphatic isocyanate, it delivers excellent resistance to UV-induced yellowing and weathering, making it well-suited for high-performance topcoats and clearcoats requiring long-term gloss and color retention in exterior environments.
Q3: How should Desmodur IL 1451 be stored and handled to maintain stability?
A: Store in tightly sealed containers under dry, inert conditions (e.g., nitrogen blanket) at temperatures between 10–30 °C. Protect from moisture, heat, and direct sunlight. Prolonged exposure to ambient humidity may cause gelation or viscosity increase due to urea formation.
Q4: Which types of resin systems is Desmodur IL 1451 typically compatible with?
A: It is widely used with hydroxyl-functional acrylics, polyesters, and alkyds in two-component (2K) solventborne and high-solids coating systems. Compatibility with waterborne polyols requires careful evaluation due to potential side reactions with water.
Q5: What is the typical dosage range when formulating with Desmodur IL 1451?
A: Dosage depends on the hydroxyl value and molecular weight of the resin system, but it is generally used at low concentrations — typically ranging from 0.1% to 2% by weight relative to total formulation — to achieve full crosslinking without excessive isocyanate residue.
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