PU adhesive, or polyurethane adhesive, is a versatile, high-performance bonding solution widely used in the footwear industry. Known for its strong adhesion, flexibility, and durability, it is ideal for bonding a variety of materials such as leather, rubber, and synthetic fabrics. PU adhesives offer excellent resistance to heat, moisture, and wear, ensuring long-lasting bonds in both casual and performance footwear applications.
Chemical Composition: Based on polyurethane resins, providing a balance between flexibility and rigidity.
Cure Time: 12-24 hours for full curing, depending on temperature and humidity.
Viscosity: Medium viscosity, allowing for easy application with minimal sagging.
Tensile Strength: Up to 4000 psi, making it suitable for high-stress applications.
Temperature Resistance: Performs well between -40°C and 90°C, maintaining flexibility even in low temperatures.
Shelf Life: 12 months when stored in a cool, dry place.
Specific Use Cases: Commonly used for bonding leather, rubber, and synthetic materials in footwear repair and manufacturing.
Industry Use: Widely utilized in industries such as footwear manufacturing, automotive assembly, construction, and marine repairs.
Materials Compatibility: Bonds effectively with leather, rubber, wood, metal, plastic, and concrete.
Benefits and Advantages:
Strong and Flexible Bond: Ideal for applications where movement and vibration are present, such as footwear soles.
Waterproof: Excellent resistance to moisture, making it suitable for outdoor use and marine applications.
UV Resistance: Resists degradation from exposure to sunlight, maintaining its bond strength over time.
Impact Resistance: Absorbs vibrations and shocks, making it perfect for high-impact areas.
Heat Resistance: Maintains integrity in high-temperature environments, unlike some other adhesives that may weaken.
Surface Preparation: Clean the surfaces to be bonded with a suitable solvent to remove grease, dust, and debris.
Apply Adhesive: Apply an even layer of PU adhesive using a brush or roller.
Press Surfaces Together: For best results, press the surfaces together firmly for 2-5 minutes.
Curing Process: Allow the adhesive to cure for 12-24 hours at room temperature, avoiding exposure to moisture during this time.
Post-Application Care: Avoid heavy loading or stress on the bond for 24 hours to ensure maximum bond strength.
Safety and Handling:
Safety Precautions: Wear gloves and safety glasses during application to avoid skin and eye contact.
Ventilation Requirements: Apply in a well-ventilated area to prevent inhalation of fumes.
Disposal Instructions: Dispose of adhesive waste in accordance with local regulations; do not pour into drains.
Storage Guidelines: Store in a cool, dry place, away from direct sunlight and sources of heat.
Environmental Impact:
Sustainability Initiatives: Our polyurethane adhesives are available in eco-friendly formulations that minimize VOC emissions.
Recyclability: The packaging is fully recyclable, reducing overall environmental footprint.
Non-Toxic Formulas: Low-VOC versions are available, reducing the impact on indoor air quality.
Problem: Adhesive not bonding properly.
Solution: Ensure surfaces are clean and dry before application. Moisture can prevent proper adhesion.
Problem: Adhesive curing too slowly.
Solution: Increase temperature or move to a less humid environment to speed up curing.
Problem: Adhesive is too thick.
Solution: Warm the adhesive slightly by placing the container in warm water to improve flow.
Common adhesives in footwear manufacturing include PU adhesives, grafted adhesives, chloroprene adhesives, spray adhesives, and synthetic rubber adhesives, each suited for specific applications.
Choose adhesives based on compatibility with shoe materials, such as leather, fabric, or rubber, considering factors like flexibility and durability. You can also contact our team for more details.
Solvent-based adhesives provide strong bonds and fast drying times, while water-based adhesives are more environmentally friendly and easier to clean.
Adhesive performance can be affected by climate; extreme temperatures or humidity may impact drying times and bond strength.
Safety precautions include working in a well-ventilated area, wearing gloves and masks, and following the manufacturer’s guidelines.
The shelf life of footwear adhesives typically ranges from 6 months to 2 years, depending on storage conditions and formulation.
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