Grafted adhesives are a specialized type of bonding agent that utilize grafted polymers to enhance adhesion properties. By chemically modifying the polymer backbone, grafted adhesives achieve superior bonding strength and improved compatibility with a wide range of materials. They are particularly effective in demanding applications where adhesion to challenging substrates like certain plastics or composites is required, making them valuable in industries like automotive, aerospace, and advanced footwear manufacturing.
Chemical Composition: Composed of a primary polymer (e.g., polyethylene, polypropylene) with grafted functional groups that improve bonding characteristics.
Cure Time: Varies from 20 minutes to several hours, depending on the type of grafting polymer and application conditions.
Viscosity: Available in both low and high viscosities, depending on the formulation, which can be adapted for different application methods.
Tensile Strength: Can reach up to 5000 psi, providing strong and durable bonds for structural applications.
Temperature Resistance: Maintains performance from -30°C to 120°C, making it suitable for both cold and heat-resistant applications.
Shelf Life: Approximately 12 months if stored properly in a cool, dry environment.
Specific Use Cases: Ideal for bonding dissimilar materials such as plastics to metal or rubber to synthetic fabrics, often used in high-performance sports footwear.
Industry Use: Common in automotive parts assembly, aerospace component bonding, advanced footwear manufacturing, and the electronics industry.
Materials Compatibility: Works exceptionally well with difficult-to-bond materials like polyethylene, polypropylene, certain thermoplastics, and composites.
Superior Adhesion: Grafted polymers enhance surface energy, improving adhesion to low-surface-energy plastics and composites.
Strong Mechanical Properties: Provides high tensile and shear strength, suitable for structural applications.
Versatile Formulation: Can be customized for specific applications, offering flexibility in terms of viscosity and curing times.
Resistance to Environmental Factors: Excellent resistance to chemicals, moisture, and UV light, ensuring long-term durability.
Low Shrinkage: Cures with minimal shrinkage, maintaining the structural integrity of the bonded parts.
Surface Preparation: Clean the surfaces thoroughly with a suitable solvent or abrasive to ensure proper adhesion.
Apply Adhesive: Apply a thin, even layer of the grafted adhesive using a brush, roller, or applicator gun.
Assembly: Press the materials together, ensuring proper alignment before the adhesive begins to cure.
Curing Process: Allow the adhesive to cure under recommended conditions (typically room temperature, but can be accelerated with heat).
Post-Application Care: Avoid subjecting the bonded components to stress until the adhesive has reached full strength.
Environmental Impact:
Sustainability Initiatives: Formulations with reduced VOC content are available, minimizing environmental impact.
Recyclability: Grafted adhesives come in recyclable packaging, supporting waste reduction.
Non-Toxic Formulas: Low-VOC and solvent-free versions are available, improving safety for indoor applications and reducing pollution.
Safety and Handling:
Safety Precautions: Use gloves and eye protection when handling to prevent skin contact.
Ventilation Requirements: Work in a well-ventilated area, especially when using formulations with strong odors or VOCs.
Disposal Instructions: Dispose of any unused adhesive and containers in accordance with local regulations; avoid pouring into water systems.
Storage Guidelines: Store in a tightly sealed container in a cool, dry place, away from direct sunlight and heat sources.
Problem: Adhesive not adhering to low-surface-energy materials.
Solution: Ensure that the grafted adhesive is specifically formulated for those materials, or use a primer to enhance adhesion.
Problem: Curing takes too long.
Solution: Use heat to accelerate the curing process if the materials allow.
Problem: Adhesive becomes too thick before application.
Solution: Warm the adhesive slightly in a hot water bath to improve flow before applying.
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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