The application relates to the technical field of inks, and discloses a long-acting coagulation ink formula, a preparation method and application, the ink comprising a water-based
polyurethane emulsion, pigments, a defoaming agent and a dispersing agent; the water-based
polyurethane emulsion formula is
polytetrahydrofuran glycol,
glycerol monooleate,
isophorone diisocyanate, a chain
extender and a
hindered phenol crosslinking agent; the
hindered phenol crosslinking agent is prepared and introduced into a molecular
chain segment of the water-based
polyurethane binder, linear water-based polyurethane macromolecules are linked in the form of chemical bonds, a crosslinked
network structure is formed, molecular chain movement is limited, aggregation is not easy, gel during storage can be reduced, and the
hindered phenol is linked to the polyurethane molecular chain through chemical bonds, free radicals are captured by the hindered
phenol groups, and the phenomenon of ink skinning, gelation and coagulation of the polyurethane ink caused by oxidation during storage and use is avoided; the ink has excellent stability, adhesion, skinning resistance,
rubbing resistance and
alcohol resistance.