A preparation method of high-bonding waterborne
polyurethane resin applied to a PET film comprises the steps of dissolving 30-45 mole parts of aliphatic
isocyanate, 5-10 mole parts of
polyester polyol, 5-15 mole parts of polyether polyhydric alcohols and 1-5 mole parts of
fluorine-containing polyhydric alcohols into
acetone and reacting at a temperature of 70-90 DEG C for 1.5-3h to obtain
prepolymer; warming to a temperature of 70-75 DEG C, adding 1-5 mole parts of dimethylol propionic acid and 1-5 mole parts of
ethylene glycol, carrying out chain extension for 0.5-1.0h, cooling to a
room temperature, adding 2-5 mole parts of
triethylamine in high-speed stirring, adding water to emulsify, reducing pressure and distilling to remove the
acetone, thus obtaining the high-bonding waterborne
polyurethane resin applied to the PET. A
fluorine functional group is introduced into the waterborne
polyurethane resin, so that the attachment of the waterborne polyurethane resin and that of the PET film are improved. When being applied to the surface of the PET
film material, the high-bonding waterborne polyurethane resin has the advantages of being free of
toxicity, good in film forming property, high in bonding force, high in attachment and the like; furthermore, the high-bonding waterborne polyurethane resin successfully solves the problem of difficulty in realizing bonding attachment of waterborne polyurethane ink and waterborne polyurethane glue on the PET film.