Product Description
Dimer Acid Diisocyanate (DDI), a type of aliphatic diisocyanates, a non-yellowing isocyanate, is a chemically modified isocyanate produced by incorporating dimer acid into its molecular chain. This unique modification significantly enhances the performance of polymers, making them ideal for polyurea coating formulations and other industrial applications. DDI is specifically engineered to provide polymers with high flexibility, durability, and non-yellowing properties, ensuring long-term stability and performance even in harsh environments. As a polyurea coating isocyanate (Polyurea isocyanate), it is widely used in adhesives, polyurea coatings, elastomers, and applications demanding superior chemical resistance, mechanical strength, and aesthetic retention.
• Non-Yellowing Properties: DDI's molecular design minimizes UV-induced discoloration, making it ideal for applications requiring aesthetic durability.
• Reactive Groups: The molecular structure contains reactive isocyanate groups that react with curing agents to form a robust crosslinked network.
• Chemical Resistance: Polymers modified with DDI exhibit excellent resistance to acids, alkalis, and solvents.
• Flexibility: Enhances polymer flexibility, reducing cracking under stress—critical for polyurea coating DDI formulations.
• Weather Resistance: Exceptional stability under UV exposure, humidity, and temperature fluctuations.
• Low-Temperature Performance: Maintains flexibility and performance at sub-zero temperatures.
• Adhesion Strength: Bonds strongly to metals, plastics, glass, and composites.
• Dielectric Properties: Ideal for electronics due to low hydroxyl content and high insulation.
• Low Shrinkage: Ensures dimensional stability during curing.
• High Hardness: Delivers mechanical strength without sacrificing elasticity.
• Polyurea Coatings: DDI is a cornerstone for high-performance polyurea coatings, offering exceptional corrosion protection, abrasion resistance, and non-yellowing finishes for automotive, marine, and architectural surfaces.
• Adhesives & Sealants: Used in electronics-grade adhesives with superior bonding strength.
• Epoxy Resin Toughening: Enhances toughness for durable electronic components.
• Polyurethane Elastomers: Improves longevity in shoe soles, gaskets, and industrial parts.
• Specialty Polymers: Tailored for polyurea coating isocyanate systems requiring chemical resistance, mechanical robustness, and UV stability.
| Buyer Concern | Our Solution |
| Health & Safety Regulations | DDI is safer than aromatic diisocyanates (TDI, MDI) |
| Bio-Based or Green Chemistry Goals | DDI derived from renewable dimerized fatty acids |
| Flexibility & Moisture Resistance | Excellent elongation, hydrolytic stability |
| Processing Compatibility | Low viscosity, compatible with many polyols and solvents |
| Custom Formulation Support | R&D team provides guidance for curing and blending |
| Global Shipping & Compliance | Full documentation, MSDS, COA, and other support |
| Item | Index |
| NCO, % | 13.3-15.0 |
| Hydrolyzed Chlorine, % | ≤0.06 |
| Moisture, % | ≤0.03 |
| Viscosity (20℃), mPa.s | ≤170 |
Packed in 170kg/drum. Store in a cool, dry place. Shelf life: 12 months.
Q1: How is DDI different from TDI or MDI?
A: DDI is aliphatic, bio-based, and low in toxicity compared to aromatic diisocyanates like TDI and MDI. It offers better flexibility and environmental performance.
Q2: Can I use DDI in moisture-cure PU adhesives?
A: Yes. DDI performs excellently in 1K moisture-cure systems due to its hydrophobic structure and slow reactivity.
Q3: What is the minimum order quantity (MOQ)?
A: MOQ varies by packaging size, typically 170 kg. Contact us for flexible MOQ options.
Q4: Do you offer free samples for testing?
A: Yes. We provide small quantity samples and technical datasheets for qualified customers.
Product Consistency:
Stable quality and reliable performance in every batch.
Stable Supply:
Own factory ensures long-term and steady supply.
Free Samples:
Free samples available for testing and evaluation.
Global Logistics:
Experienced in international shipping and hazardous export.
