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In the preparation of convenient food flexible packaging composite bags with general and medium performance requirements, acrylate emulsion adhesives have recently been developed to replace solvent-based PU adhesives. In the past, the disadvantage of acrylic composite adhesives was poor adhesion to nitrocellulose printing inks. The peel strength of the newer generation acrylic emulsions is almost equivalent to some solvent-based PU adhesives. If the water-dispersible isocyanate is used as a curing agent, its performance can be greatly improved.
Author: Mao Xia Source: "Information polyurethane"
The PU adhesive for solvent-based polymeric films is highly adaptable and can be used to compound a variety of different materials. Therefore, it is often used in occasions where frequent switching of composite materials and high performance composite films are required. However, a solvent recovery and reuse device must be provided, and its solid mass Score the highest. When the performance requirements are not high, use solvent-free PU adhesive as much as possible to control the mass fraction of free isocyanate monomer to meet food hygiene standards. Current high performance solvent-free adhesives are still in the experimental stage.