Water-based polyurethane laminating adhesive uses water as the dispersion medium. With advantages such as environmental friendliness, safety, and stable performance, it has now become one of the mainstream materials in the field of soft packaging composites, aligning with the development trend of green transformation in the industry.
This laminating adhesive has no volatile harmful solvents, has a low odor, and excellent flame retardancy. During production and use, it does not cause air pollution. It meets the hygiene requirements for packaging in the food and daily chemical industries. It is particularly suitable for processing products such as food soft packaging bags and daily-use composite films. In terms of adhesive performance, it has excellent adhesion to common flexible packaging substrates such as PE, PP, PET, and aluminum foil. The bonding strength of the composite products is high, it is resistant to bending and low temperature, and can adapt to subsequent packaging processes such as cutting, heat sealing, and storage.
From the perspective of process compatibility, water-based polyurethane laminating adhesive can be matched with conventional dry composite equipment. It has uniform coating, good leveling performance, and a moderate curing speed, balancing production efficiency and product appearance. At the same time, it has outstanding flexibility, and the composite film is less likely to have delamination or wrinkling problems, and can also meet some functional packaging requirements such as water boiling resistance and steam boiling resistance.
With stricter environmental regulations, the flexible packaging industry has gradually phased out solvent-based adhesives and the application scope of water-based polyurethane laminating adhesives has continued to expand. Currently, its main drawback lies in the fact that there is still room for improvement in terms of temperature resistance and water resistance. The industry is also constantly optimizing the formula to further enhance the comprehensive performance, promoting its deep penetration in the high-end flexible packaging field.
