High-shear-strength two-component polyurethane corner-combining adhesive and preparation method thereof

The invention provides a high-shear-strength two-component polyurethane corner combining adhesive which comprises a component A and a component B in percentage by mass, wherein the component A comprises the following components in percentage by weight: 15%-30% of an NCO-terminated polyurethane prepolymer; 15%-35% of polymethylene polyphenyl polyisocyanate; 30%-50% of nano calcium carbonate; 0-4% of a water removal agent A; and 0-4% of fumed silica. The component B comprises the following components in percentage by weight: 20%-40% of polypropylene carbonate trihydric alcohol; 10%-30% of polypropylene carbonate dihydric alcohol; 30%-50% of nano calcium carbonate; 0-5% of a water removal agent B; 0.5%-3% of an adhesion promoter; 0.01%-0.3% of a catalyst; and 0-4% of fumed silica. The polypropylene carbonate polyol is added into the polyurethane corner-combining adhesive prepared by the invention, so that the strength of the polyurethane corner-combining adhesive is higher than that of the conventional polyether