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Polyurethane adhesive

1. Basic Composition & PropertiesTable 1: Fundamental CharacteristicsParameterSpecificatio

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Content

1. Basic Composition & Properties

Table 1: Fundamental Characteristics

Parameter	Specification Range
Chemical Base	Polyol + Isocyanate
Appearance	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

2. Classification by Chemistry

Table 2: Major Polyurethane Adhesive Types

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

3. Performance Comparison

Table 3: PU vs Other Adhesive Types

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

4. Processing Parameters

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

5. Industrial Applications

Automotive: Windshield bonding, panel assembly

Construction: Insulation panels, flooring

Footwear: Sole attachment

Electronics: Component potting

Packaging: Flexible laminates

6. Advantages & Limitations

Advantages:

Excellent flexibility and toughness
Good chemical/environmental resistance
Bonds diverse materials (metal, plastic, wood)
Adjustable cure speed
Good gap-filling properties

Limitations:

Sensitive to moisture during storage
Requires surface preparation
Limited high-temp performance
May yellow with UV exposure

7. Safety & Handling

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

8. Recent Developments

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

Disclaimer: The above content is for reference and communication only among industry insiders, and does not guarantee its accuracy or completeness. According to relevant laws and regulations and the regulations of this website, units or individuals who purchase related items should obtain valid qualifications and qualification conditions.

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