TPR primer is a specialized solution designed to improve the adhesion of adhesives to thermoplastic rubber (TPR) surfaces. TPR is commonly used in footwear, toys, automotive parts, and other consumer products due to its flexibility, durability, and rubber-like properties. However, bonding to TPR can be challenging because of its low surface energy. TPR primer chemically modifies the surface, creating better adhesion sites and ensuring a stronger, more durable bond when using adhesives like polyurethane, cyanoacrylate, or epoxy.
Chemical Composition: Typically formulated with solvents and reactive agents that alter the surface characteristics of TPR, making it more receptive to adhesives.
Drying Time: Dries in 5-10 minutes, depending on environmental conditions like temperature and humidity.
Viscosity: Low viscosity, which enables smooth application with brushes or spray systems for even coating.
Temperature Resistance: Effective across a temperature range of 10°C to 35°C, suitable for various manufacturing and repair settings.
Shelf Life: Approximately 12 months when stored in a cool, tightly sealed container to maintain effectiveness.
Specific Use Cases: Essential for priming TPR soles and components before bonding them to leather, fabric, or synthetic materials in footwear manufacturing.
Industry Use: Widely used in the footwear industry for bonding TPR soles to upper materials, as well as in automotive parts assembly, toy manufacturing, and various consumer product repairs involving TPR.
Materials Compatibility: Designed specifically for thermoplastic rubber but can also be effective with other elastomers and flexible plastics.
Enhanced Adhesion: Improves the bonding strength between TPR surfaces and adhesives, ensuring a secure, long-lasting bond that resists delamination.
Quick Drying: Speeds up production processes by drying quickly, allowing for rapid transition to adhesive application.
Consistency: Ensures uniform preparation of TPR surfaces, leading to consistent adhesive performance across different parts.
Versatile Application: Effective with a range of adhesives, including polyurethane and epoxy, making it suitable for a variety of projects and repairs.
Durable Bond: Prepares surfaces to create strong bonds that withstand stress, flexing, and exposure to moisture or temperature variations.
Surface Preparation: Clean the TPR surface thoroughly with a suitable cleaner to remove any oils, dust, or contaminants.
Apply Primer: Using a brush or sprayer, apply a thin, even coat of TPR primer to the bonding area.
Drying Time: Allow the primer to air dry for 5-10 minutes until it is no longer tacky to the touch.
Apply Adhesive: Once the primer is fully dry, apply the chosen adhesive suitable for the specific TPR material.
Bonding: Press the surfaces together firmly according to the adhesive’s instructions, applying even pressure to ensure a secure bond.
Safety Precautions: Wear gloves, safety glasses, and protective clothing to avoid skin and eye contact with the primer.
Ventilation Requirements: Apply in a well-ventilated area to avoid inhalation of fumes, especially when using in larger quantities.
Disposal Instructions: Dispose of any leftover primer and used applicators according to local environmental regulations; avoid pouring into drains.
Storage Guidelines: Store in a cool, dry location, tightly sealed to prevent evaporation and maintain product stability.
Sustainability Initiatives: Available in low-VOC formulations to minimize impact on indoor air quality and meet environmental standards.
Recyclability: Packaged in recyclable containers, supporting eco-friendly disposal practices.
Non-Toxic Formulas: Some formulations use safer, low-toxicity solvents, providing safer handling during use and reducing health risks.
Problem: Adhesive does not adhere properly to the primed TPR surface.
Solution: Ensure that the primer is completely dry before applying the adhesive, as applying too soon can interfere with bonding.
Problem: Primer leaves streaks or uneven coating.
Solution: Use a clean, high-quality brush or spray system for application, and apply a thin, even coat.
Problem: Primer dries too quickly in warm conditions.
Solution: Apply in a cooler environment or use a slower-drying primer variant to allow for proper application.
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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