The invention discloses an aqueous composite
adhesive and a preparation method thereof, and belongs to the field of high
molecular materials. The
adhesive is
polyurethane /
acrylate PUA composite
emulsion, wherein based on the total weight of the PUA composite
emulsion, the content of the
polyurethane is 5 to 20 percent; the content of the polyacrylate is 25 to 45 percent; the content of water is 50 to 70 percent; and the
solid content of the PUA composite
emulsion is 30 to 50 percent. The preparation method comprises the following steps: preparing the aqueous
polyurethane emulsion; preparing the aqueous polyurethane /
acrylate PUA composite emulsion from the aqueous polyurethane emulsion; and finally, regulating the
solid content of the aqueous polyurethane /
acrylate PUA composite emulsion by using de-ionized water, and adding an antifoaming agent, a
wetting agent and an
antiseptic to prepare the aqueous composite
adhesive. In the prepared aqueous PUA composite emulsion, emulsion particles have complex phase structures, a
carbamic acid ester chain is knitted tightly with an acrylicacid chain at the
molecular level, and the synergic effect between the two makes the performance of a
coating better than that of a physically blended
coating, so that the aqueous PUA composite emulsion has high performance and
environmental protection property.