Preparation method of resin, resin, ink and preparation method thereof

The invention discloses a preparation method of a resin, the resin, an ink and a preparation method of the ink. The preparation method of the ink vehicle resin comprises the following steps of: step 1, reacting diisocyanate with (methyl) acrylic acid and hydroxyl-containing (methyl) acrylate monomers to generate a first prepolymer, wherein the molar weight of the isocyanate groups is greater than the sum of the molar weight of carboxyl and the molar weight of hydroxyls; step 2, reacting the first prepolymer with a hydrophilic chain extender to generate a second prepolymer; and step 3, mixing the second prepolymer with (methyl) alkyl acrylate containing no hydroxyl, and adding nano-zinc oxide in the presence of an initiator; and after reacting the second prepolymer with the (methyl) alkyl acrylate containing no hydroxyl, forming the ink vehicle resin. The resin prepared by the resin preparation method of provided by the invention is high in drying speed after being applied to a water-based ink.