Automotive Interior – Reactive Polyurethane Hot Melt Adhesive (PUR)

1. Fundamental Properties

Table 1: Typical Technical Specifications

2. Application Matrix

Table 2: Automotive Interior Applications by Component

3. Performance Comparison

Table 3: PUR vs Conventional Automotive Adhesives

4. Processing Parameters

Application Equipment:

• Temperature-controlled melt tanks (110-140°C)
• Gear pump delivery systems
• Programmable robotic applicators
• Slot/nozzle sizes: 0.3-2.0mm

Optimal Conditions:

• Substrate temperature: 15-40°C
• Ambient RH: 30-70%
• Compression time: 10-60 seconds
• Pressure: 0.1-0.3 MPa

5. Material Compatibility

6. Quality Control Standards

7. Advantages & Limitations

Advantages:

• 100% solids content (no solvents)
• Immediate handling strength
• Excellent gap-filling properties
• Resistance to oils and plasticizers
• Reformable before full cure
• Meets automotive VOC requirements

Limitations:

• Requires moisture for full cure
• Specialized application equipment
• Limited open time control
• Higher raw material cost
• Thermal degradation >180°C

8. Industry Trends

Next-Gen Developments:

• Faster-curing formulations (90% cure in 4h)
• Lower application temperatures (95-120°C)
• Bio-based polyol content (>30%)
• Enhanced adhesion to untreated plastics
• Smart color-change indicators