IntroductionAliphatic polyisocyanates based on hexamethylene diisocyanate (HDI) trimers are wid
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Aliphatic polyisocyanates based on hexamethylene diisocyanate (HDI) trimers are widely used in high-performance coatings due to their excellent durability, flexibility, and UV resistance. This article examines a flexibilizing HDI trimer variant (coded as MT3800 for reference) and its key properties through comparative data tables.
Property | MT3800 (Flexibilized HDI Trimer) | Conventional HDI Trimer |
---|---|---|
NCO Content (%) | 16.5-17.5 | 21-23 |
Viscosity (mPa·s @ 25°C) | 2500-3500 | 1200-1800 |
Functionality | ~3.1 | ~3.2 |
Glass Transition Temp (°C) | -40 | -30 |
Elastic Recovery (%) | >85 | 70-75 |
Parameter | MT3800-Based Coating | Standard HDI Trimer Coating |
---|---|---|
Flexibility (T-bend) | Passes 0T | Fails at 2T |
Impact Resistance (kg·cm) | >50 | 30-40 |
UV Stability (1000h QUV) | ΔE <1.0 | ΔE 1.5-2.0 |
Chemical Resistance | Excellent | Good |
Pot Life (min) | 45-60 | 30-40 |
Component | Weight % | Function |
---|---|---|
MT3800 | 25-35 | Crosslinker |
Polyol (OH# 110) | 50-60 | Film former |
Flow Additive | 0.5-1.0 | Surface leveling |
UV Absorber | 1-2 | Light stabilization |
Solvent (Ester-based) | 10-15 | Viscosity adjustment |
Feature | MT3800 System | Alternative Technologies |
---|---|---|
Cure Schedule | 30min @80°C or 7d @23°C | 60min @120°C |
Recommended Uses | • Flexible plastics • Automotive elastomers • Outdoor fabrics | • Rigid substrates • Industrial metals |
VOC Content (g/L) | 280-320 | 350-400 |
Adhesion (Cross-cut) | 5B | 3B-4B |
Enhanced Flexibility: Superior elongation (>200%) vs conventional trimers (~150%)
Lower Cure Temperature: Enables energy-saving processing
Extended Open Time: Better workability for complex parts
This flexibilizing HDI trimer variant demonstrates significant improvements in coating performance, particularly for applications requiring:
Extreme flexibility
Outdoor durability
Low-temperature curing
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