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Waterborne Polyurethane Adhesive for Footwear
AJ440 is a high-performance solution designed for the footwear industry. This innovative adhesive offers superior bonding strength, ensuring durable and long-lasting connections between various shoe components. Formulated to provide excellent adhesion to a wide range of materials, including leather, synthetic fabrics, and rubber, its water-based composition makes it an environmentally friendly alternative to traditional solvent-based adhesives. AJ440 adhesive reduces harmful emissions and promotes a safer working environment, allowing you to achieve exceptional results while prioritizing sustainability and quality.
Footwear production
Product Advantages
Why Choose AJ440?
- Superior Bonding Strength: AJBASPAR delivers exceptional adhesion, ensuring strong and durable bonds between different shoe materials.
- Eco-Friendly: Significantly reduces volatile organic compound (VOC) emissions, contributing to a healthier environment and safer workplace.
- Versatile Application: Suitable for bonding a variety of materials such as leather, synthetic fabrics, and rubber, making it ideal for diverse footwear designs.
- Enhanced Durability: The adhesive’s robust formulation provides excellent resistance to tear, ensuring the longevity of the footwear.
- User-Friendly: Easy to apply and clean up, simplifying the manufacturing process and increasing efficiency and productivity.
- Compliance with Standards: Meets industry standards for performance and environmental safety, giving you peace of mind and confidence in your product.
Instructions for Us
- Surface Preparation: Ensure that the surfaces to be bonded are clean, dry, and free from dust, grease, or any contaminants. Proper surface preparation is crucial for optimal adhesion.
- Application of Adhesive:
- Manual Application: Apply the adhesive evenly on both the upper and sole using a brush or roller.
- Spray Application: For a more uniform application, use a spray gun. The high solid content allows for efficient coverage with less consumption.
- Drying: Allow the adhesive to dry naturally at room temperature or use drying tunnels to speed up the process. The recommended drying temperature is between 40-50°C. Ensure the adhesive is completely dry before proceeding to the next step.
- Activation: Activate the adhesive by heating the bonded surfaces in a heating chamber. The recommended activation temperature is between 70-80°C. The activation time may vary depending on the color and material of the upper and sole.
- Bonding:
- Align the upper and sole carefully.
- Press the surfaces together using a press machine while they are still warm. Apply a pressure of approximately 2-4 bars for 15-20 seconds to ensure a strong initial bond.
- Curing: Allow the bonded shoes to cure at room temperature. The adhesive will continue to strengthen over time, providing a durable and long-lasting bond.
Tips for Optimal Results
- Storage: Store the adhesive in a cool, dry place away from direct sunlight. The recommended storage temperature is between 10-30°C. Ensure the container is tightly sealed when not in use
- Cleanup: Easily clean application tools and equipment with water after using the adhesive.
By following these tips, you can achieve optimal performance and durability with AJBASPAR’s waterborne polyurethane adhesive for footwear.
During spraying, a large amount of adhesive disperses into the air as mist. Does this mean the adhesive quality is poor?
No, the issue is not related to adhesive quality. During spraying, the air pressure should be adjusted between 3 to 4 bar, depending on the viscosity level. Spraying should be done gently from a distance of 20 cm onto the surface for optimal results.
Does viscosity affect the quality of the adhesive?
Viscosity is not directly related to the quality of the adhesive used. The only factors that truly impact adhesive quality are the type and percentage of solid content. Viscosity merely determines the appropriate spray gun nozzle type and the required air pressure settings. As long as the air pressure and spraying distance are properly adjusted, viscosity will not affect adhesive performance or consumption.
What is the solid content of an adhesive?
Every adhesive consists of a solvent and a primary bonding component. The adhesive strength depends on the amount and type of this primary component, which is dispersed in the solvent as solid particles.
The solid content refers to the proportion of the primary bonding component that remains after the solvent has evaporated, and it is expressed as a percentage. Most standard adhesives on the market have a solid content of around 50%, meaning that in one kilogram of adhesive, approximately 500 grams are the active bonding material, and the remaining 500 grams are water or solvent.
Naturally, the higher the solid content, the greater the amount of bonding agent present, which ultimately increases the adhesive’s bonding strength.
It is important to note that solid content has no correlation with viscosity (i.e., how thick or thin the adhesive is). Many operators mistakenly consider viscosity a measure of adhesive quality, which is misleading. As mentioned earlier, viscosity is only relevant for adjusting the air pressure of the spray gun during application and does not affect the bonding performance of the adhesive.
Are polyurethane adhesives better than acrylate adhesives?
Polyurethane and acrylate adhesives differ in their chemical bonding mechanisms and adhesive performance. Polyurethane adhesives, due to their unique polymer structure, are heat-activated and provide an ideal level of adhesion. They offer significantly higher quality in terms of spray ability, heat resistance, and stability against water and chemicals under various environmental conditions compared to acrylates.
Therefore, polyurethane adhesives are the preferred choice for vacuum membrane pressing applications in industrial settings.
It is also important to note that polyurethane and acrylate adhesives are visually indistinguishable, and specialized laboratory testing is required to accurately differentiate between them.
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