1. Basic Composition & PropertiesTable 1: Fundamental CharacteristicsParameterSpecificatio
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| Parameter | Specification Range |
|---|---|
| Chemical Base | Polyol + Isocyanate |
| Apparence | Clear to amber viscous liquid |
| Viscosity (25°C) | 500-50.000 cP |
| Cure Mechanism | Moisture/Heat curing |
| Pot Life | 5 min - 24 hrs |
| Bond Strength | 5-25 MPa |
| Elongation at Break | 100-1000% |
| Service Temperature | -40°C to +120°C |
| Type | Composition | Features | Applications |
|---|---|---|---|
| 1-Part | Moisture-cured prepolymer | Room temp cure, high flexibility | Construction, automotive |
| 2-Part | Separate polyol/isocyanate | Fast cure, high strength | Metal bonding, composites |
| Hot Melt | Thermoplastic PU | Instant bond, repositionable | Packaging, textiles |
| Water-based | PU dispersion | Low VOC, easy cleanup | Furniture, footwear |
| Property | PU Adhesive | Epoxy | Silicone | Acrylic |
|---|---|---|---|---|
| Flexibility | Excellent | Poor | Excellent | Good |
| Impact Resistance | High | Medium | Low | Medium |
| Temperature Range | Wide | Medium | Very Wide | Narrow |
| Moisture Resistance | Good | Excellent | Excellent | Fair |
| Substrate Versatility | High | Medium | High | Medium |
| Cure Speed | Medium | Fast | Slow | Fast |
Application Methods: Spray, roll, brush, bead
Cure Conditions: 20-80°C, 30-95% RH
Surface Prep: Solvent cleaning, abrasion
Clamping Time: 10 min - 24 hrs
Full Cure: 24 hrs - 7 days
Automotive: Windshield bonding, panel assembly
Construction: Insulation panels, flooring
Footwear: Sole attachment
Electronics: Component potting
Packaging: Flexible laminates
| Aspect | Requirement |
|---|---|
| Storage Temp | 5-30°C (unopened) |
| Shelf Life | 6-12 months |
| Ventilation | Required during application |
| PPE | Gloves, goggles, respirator |
| Disposal | Chemical waste protocols |
Bio-based polyols for sustainable formulations
Faster-curing systems for production lines
Improved UV-resistant grades
Low-VOC waterborne systems
Smart PU adhesives with self-healing properties
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