Technical features and application scenarios of water-based flexible packaging polyurethane laminating adhesive

Water-based flexible packaging polyurethane laminating adhesive is an environmentally friendly adhesive that uses water as the dispersion medium and does not contain organic solvents. It is a core green material that replaces traditional solvent-based adhesives. Compared with solvent-free and solvent-based polyurethane adhesives, the greatest advantage of this product is its low VOC content and no risk of flammability or explosion. It completely solves the safety and environmental protection problems in flexible packaging production, and is suitable for strict food packaging safety production standards. 

 

This adhesive system has excellent stability and good coating fluidity. It is compatible with ordinary dry lamination equipment and does not require significant modification of the production line. The enterprise's renovation cost is low. After curing, the adhesive layer has high transparency, does not affect the color effect of the printed film, has excellent yellowing resistance performance, and is not prone to yellowing or fogging problems during long-term storage. It is particularly suitable for high-transparency food, daily chemical, and exquisite flexible packaging. 

In terms of performance, water-based polyurethane laminating adhesive has wide adaptability to substrates such as plastic films, paper, and aluminum-coated films, with uniform and gentle adhesion. The laminated film has good flexibility and is less likely to crack or curl. However, its shortcomings are also quite obvious. The curing speed is slow, and the water resistance is relatively weak. It is prone to reduced adhesion in high-humidity environments, and it is not suitable for packaging products that undergo high-temperature boiling. 

 

With the continuous tightening of environmental protection policies, water-based polyurethane laminating adhesives have seen a continuous increase in their penetration rate in the ordinary flexible packaging sector where the load is low and the temperature is normal. They have become the preferred adhesive material for small and medium-sized packaging enterprises in their green production upgrades.