Water-based plastic composite ink suitable for food flexible packaging

The invention relates to a water-based plastic composite ink. The aqueous ink is prepared from an anionic polyurethane dispersion, an acrylate emulsion, a pigment, a dispersant, a defoamer, a polyethylene wax, water, and very little isopropanol. In order to obtain a water-based ink with a good overall performance and low cost, an acrylate emulsion having good compatibility with an anionic polyurethane dispersion was synthesized. By adding a crosslinking agent, the rubbing resistance, adhesion fastness, and peel strength of the ink layer are improved. Trial water-based inks are printed on a gravure web press at a speed of 30-50 m/min for the treated biaxially oriented polypropylene film. The peel strength after compounding is 180 N/inch. The aqueous ink of the invention has fast drying speed and good friction resistance, and is particularly suitable for the composite printing of food and flexible packaging of polypropylene and polyester film.