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High reactivity with polyols and amines, enabling rapid cure at ambient or elevated temperatures.
Excellent compatibility with aromatic and aliphatic polyurethane systems for consistent film formation.
Low viscosity (<1500 mPa·s at 25°C) ensures easy handling, precise metering, and uniform dispersion.
Superior hydrolytic stability compared to conventional aliphatic isocyanates, enhancing shelf life.
Low monomeric MDI content (<0.5 wt%), meeting stringent occupational health and safety requirements.
Two-component polyurethane coatings for industrial metal protection (e.g., machinery, agricultural equipment).
High-performance adhesives in automotive interior bonding and composite lamination.
Cast elastomer systems for mining screens, rollers, and wear-resistant components.
Reaction injection molding (RIM) and structural foam applications requiring dimensional stability.
Sealants and grouts for infrastructure repair and waterproofing in civil engineering projects.
| Chemical Type | Aromatic polyisocyanate blend (MDI-based) |
| Product Form | Liquid |
| Appearance | Clear to pale yellow transparent liquid |
| NCO Content (wt%) | 29.5–30.5% |
| Viscosity (mPa·s at 25°C) | 1200–1600 |
| Density (g/cm³ at 25°C) | 1.21–1.23 |
| Flash Point (°C, closed cup) | 175–185 |
| Storage Stability (unopened, 25°C) | ≥12 months |
Q1: What is the primary function of Wanhua MDI-100 Curing Agent in polyurethane systems?
A: Wanhua MDI-100 Curing Agent is a low-viscosity, aliphatic polyisocyanate-based crosslinker designed to react with hydroxyl-functional resins (e.g., acrylics, polyesters, or polyethers) to form durable, chemically resistant polyurethane networks. It enhances hardness, chemical resistance, and thermal stability in coatings and adhesives.
Q2: Is Wanhua MDI-100 compatible with moisture-cure or one-component polyurethane formulations?
A: No — Wanhua MDI-100 is specifically formulated for two-component (2K) polyurethane systems. It requires precise metering and mixing with hydroxyl-containing components prior to application. It is not suitable for ambient-moisture-cure systems due to its controlled reactivity profile and lack of blocking agents.
Q3: How does Wanhua MDI-100 compare to aromatic isocyanate curing agents in terms of weatherability and color stability?
A: As an aliphatic isocyanate derivative, Wanhua MDI-100 offers superior UV resistance and long-term gloss/color retention compared to aromatic alternatives (e.g., TDI- or MDI-based curing agents). It is recommended for outdoor applications where yellowing and chalking must be minimized.
Q4: What are typical handling and storage requirements for this curing agent?
A: Wanhua MDI-100 should be stored in tightly sealed containers under dry, cool conditions (preferably below 30°C) and protected from moisture, heat, and direct sunlight. Prolonged exposure to humidity may cause gelation or viscosity increase. Always use dry, inert equipment during transfer and dispensing.
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