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Aliphatic polyisocyanate (flexibilizing HDI trimer)-MT3800

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.


Table 1: General Properties of MT3800 vs Standard HDI Trimer

PropertyMT3800 (Flexibilized HDI Trimer)Conventional HDI Trimer
NCO Content (%)16.5-17.521-23
Viscosity (mPa·s @ 25°C)2500-35001200-1800
Functionality~3.1~3.2
Glass Transition Temp (°C)-40-30
Elastic Recovery (%)>8570-75

Table 2: Performance in Coating Formulations

ParameterMT3800-Based CoatingStandard HDI Trimer Coating
Flexibility (T-bend)Passes 0TFails at 2T
Impact Resistance (kg·cm)>5030-40
UV Stability (1000h QUV)ΔE <1.0ΔE 1.5-2.0
Chemical ResistanceExcellentGood
Pot Life (min)45-6030-40

Table 3: Recommended Formulation Guidelines

ComponentWeight %Function
MT380025-35Crosslinker
Polyol (OH# 110)50-60Film former
Flow Additive0.5-1.0Surface leveling
UV Absorber1-2Light stabilization
Solvent (Ester-based)10-15Viscosity adjustment

Table 4: Application Comparison

FeatureMT3800 SystemAlternative Technologies
Cure Schedule30min @80°C or 7d @23°C60min @120°C
Recommended Uses• Flexible plastics
• Automotive elastomers
• Outdoor fabrics
• Rigid substrates
• Industrial metals
VOC Content (g/L)280-320350-400
Adhesion (Cross-cut)5B3B-4B

Key Advantages

  1. Enhanced Flexibility: Superior elongation (>200%) vs conventional trimers (~150%)

  2. Lower Cure Temperature: Enables energy-saving processing

  3. Extended Open Time: Better workability for complex parts

Conclusion

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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