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High reactivity with polyols and amines, enabling rapid gelation and short demold times.
Excellent compatibility with aromatic and aliphatic polyurethane systems.
Low volatility and low monomer content, supporting safer handling and reduced VOC emissions.
Consistent batch-to-batch performance due to stringent quality control in Wanhua’s ISO-certified production facilities.
Enhanced thermal stability and mechanical strength in cured elastomers and coatings.
Automotive interior trim and soft-touch coatings.
Industrial elastomeric rollers and seals.
High-performance polyurethane adhesives for composite lamination.
Castable polyurethane parts for mining and material handling equipment.
Waterborne and solvent-based PU coating systems for wood and metal substrates.
| Chemical Type | Aromatic diisocyanate-based curing agent (MDI blend) |
| Product Form | Liquid |
| Appearance | Clear to pale yellow transparent liquid |
| Primary Applications | Polyurethane elastomers, coatings, adhesives, and sealants |
| Key Features | Reactive NCO functionality, low free-MDI content, high purity |
| Storage Stability | 12 months at 25°C in sealed, dry conditions |
| Handling Precautions | Use in well-ventilated areas; avoid skin/eye contact; refer to SDS |
| Compliance | REACH registered; compliant with RoHS and GHS classification |
Q1: What is the primary function of Wanhua MDI-50 Curing Agent in polyurethane systems?
A: Wanhua MDI-50 Curing Agent is a polyisocyanate-based crosslinker designed to react with hydroxyl-terminated resins—such as polyols or acrylic polyols—to form thermoset polyurethane networks. It contributes to enhanced hardness, chemical resistance, and thermal stability in final coatings and adhesives.
Q2: Is Wanhua MDI-50 compatible with waterborne polyurethane dispersions (PUDs)?
A: Yes, Wanhua MDI-50 can be used as a co-crosslinker in selected waterborne PU systems, particularly where improved film integrity, scrub resistance, and reduced sensitivity to ambient humidity during cure are desired. Compatibility and dispersion stability should be verified under actual formulation conditions.
Q3: How does Wanhua MDI-50 differ from aromatic polyisocyanates like pure MDI or TDI?
A: Wanhua MDI-50 is a modified MDI product with controlled monomer content and optimized viscosity, offering improved handling characteristics and reduced volatility compared to TDI, while delivering better compatibility and lower NCO volatility than standard MDI prepolymers. Its formulation balance supports consistent reactivity without excessive pot life reduction.
Q4: What safety precautions should be observed when handling Wanhua MDI-50?
A: As with all isocyanate-containing materials, appropriate personal protective equipment—including nitrile gloves, chemical-resistant goggles, and respiratory protection in poorly ventilated areas—is essential. Avoid skin contact and inhalation of vapors or aerosols. Store in tightly sealed containers under dry, cool conditions away from moisture and amines.
Contact With Us:
E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
