| abstract |
The invention relates to an environment-friendly printing process for polyethylene packaging materials, which prepares a three-layer co-extruded polyethylene composite film, wherein the corona layer is blended and melted with nano-chitosan powder; a silane coupling agent is added to the cooking-resistant water-based polyurethane ink and triethylenediamine to adjust the pH value; after corona, it is printed on the corona layer, and then dried and rolled at 95-100°C. In the present invention, under the conditions of triethylenediamine catalysis and drying temperature, the hydroxyl group in the chitosan on the surface of the corona layer makes the epoxy group ring-opening reaction. The amino groups in chitosan are coupled to form covalent bonds, and at the same time, the corona treatment on the surface of the corona layer makes the retort-resistant water-based polyurethane ink bind firmly to polyethylene and KH‑560 is more easily combined with the hydroxyl and amino groups of chitosan and corona The combination of layer reaction, the three synergistically enhance the adhesion fastness of the ink while ensuring the hydrolysis resistance and antibacterial lasting effect of chitosan. |