The invention belongs to the technical field of
hot melt adhesives, and discloses a waterborne
polyurethane hot melt adhesive as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) adding polyether
polyol in a reaction kettle, heating to 120-130 DEG C, and carrying out heat preservation, water removal and cooling; (2) under the condition of stirring, dropwise adding a catalyst into the reaction kettle and then adding polyisocyanate, heating to 80-88 DEG C, and carrying out a heat preservation reaction to obtain a mixture; (3) dropwise adding a carboxylic
monomer solution into the mixture, adjusting the temperature, and carrying out heat preservation reaction to obtain a crude product; (4) adding
acetone into the crude product, increasing the rotating speed of a stirrer, cooling to 35-40 DEG C, adding a neutralizing agent for
neutralization, taking out the obtained material, adding
distilled water, and conducting high-speed shearing emulsification and rotating
evaporation to obtain the waterborne
polyurethane hot melt adhesive. The waterborne
polyurethane hot melt adhesive provided by the invention is low in
melt temperature, and high in
solid content and stripping force, and remains in a
liquid state at normal temperature; meanwhile, the preparation method is mild in reaction condition and low in
energy consumption; the waterborne polyurethane
hot melt adhesive is applied to the field of adhesives.