Water-based adhesive material for the flexible packaging industry combined strengths

Composite flexible packaging developed to reduce or remove the complex of organic solvents has become the joint efforts of the whole industry forward. At present, to the total elimination of the complex solvent water-based compound and has modalities solvent-free compound. Solvent-free compound due to technical factors such as cost, is still in its infancy, and the water-based adhesive can be due to the current dry compound directly on the machine, so domestic manufacturers of flexible packaging welcomed in foreign countries has been made Big step.

Water-based compound is divided into dry and wet composite compound, the main compound used in wet paper-plastic, aluminum compound paper, white latex in this area have been in great demand. In the plastic and plastic composite aluminum plastic composite, mainly water and water-based polyurethane and acrylic polymer. There are water-based adhesive edge.

(1) composite strength. The molecular weight of water-based adhesive, the adhesive is polyurethane several times, and its bonding power is by van der Waals force, belonging to the physical adsorption, it's a very small amount of glue on a very high strength composite. For example, with the two-component polyurethane adhesive, Dulv Mo in the compound, 1.8g/m2 the rubber coating can be achieved on the volume of two-component polyurethane adhesive rubber 2.6g/m2 amount of time The composite strength.

(2) soft, Du Lvmo more complex. Waterborne one-component adhesive than the two-component polyurethane adhesive soft, when they solidified, very rigid polyurethane adhesive, and water-based adhesive is very soft. Therefore, the water-based adhesive properties of soft and flexible Du Lvmo more complex, not easy to lead to the transfer of Dulv Mo.

(3) do not need ripening, after the plane can be cut. Waterborne one-component adhesive compound does not need ripening, after the plane can be cut, bag, and other follow-up process, because this is the beginning of the sticky water-based adhesive strength especially in high-shear strength to ensure that the product in the composite And all points in the process will not lead to "tunnel", fold. In addition, the use of water-based adhesive compound in the membrane placed after 4 hours, the intensity can be increased by 50%, this is not the concept of aging, the gel is not cross-linked, mainly with the flow of the plastic-composite with the strength Raising.

(4) thin-layer, transparent and good. As the water-based adhesive on the small amount of plastic and rubber, when the concentration is higher than solvent-based adhesive, so dry and need to discharge the water far less than solvent-based adhesive. Water completely dry, transparent film will become, as the thin layer, the Composite transparency than a good solvent-based adhesive.

(5) environmental protection, human-friendly. After drying water-based adhesive is no residual solvent, many manufacturers use to avoid water-based adhesive compound brought about by the solvent residue, so the use of water-based adhesive production safety, the operator of health and no damage.