Water-based plastic composite ink

The invention relates to a water-based plastic composite ink. The aqueous ink is prepared from an anionic polyurethane dispersion, an acrylic emulsion, a pigment, a dispersant, a defoamer, a polyethylene wax, water, and very little isopropyl alcohol. In order to obtain a water-based ink with a good overall performance and low cost, a cool acrylic 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 water-based ink of the invention has fast drying speed and good friction resistance, and is particularly suitable for composite printing of food flexible packaging of polypropylene and polyester films.