The invention relates to a
polyurethane adhesive as well as a preparation method and application thereof. The
adhesive is prepared from the following raw materials in percentage by weight: 35 to 65 weight percent of composite polyether
polyol, 14 to 25 weight percent of polyisocyanate, 1 to 5 weight percent of hydrophilic chain
extender, 1 to 5 weight percent of micromolecule chain
extender, 0.05 to 3 weight percent of catalyst, 0.5 to 4 weight percent of neutralizer, 1 to 7 weight percent of end-capping
reagent, 1 to 8 weight percent of
silane coupling agent, 2 to 12 weight percent of mesoporous
microsphere, 2 to 5 weight percent of isopropanol, 2 to 5 weight percent of
butyl acetate, 0.2 to 4 weight percent of defoaming agent and the balance of water, wherein the composite polyether
polyol is a composition of Mannich polyether
polyol and flexible foam polyether polyol in a
mass ratio of 1: (0.5-1); the
adhesive disclosed by the invention can replace
hot melt adhesive
powder in garment
pyrography, can improve the softness, air permeability, friction resistance and soaping-resistant color fastness of fabric
pyrography printing, and can obviously reduce the film-forming
drying and curing temperature of the adhesive at the same time.