Steaming-resistant bi-component solvent-free polyurethane laminating adhesive and preparation method thereof

The invention relates to the technical field of polyurethane adhesives, in particular to a steaming-resistant bi-component solvent-free polyurethane laminating adhesive and a preparation method thereof. The steaming-resistant bi-component solvent-free polyurethane laminating adhesive is composed of a component A and a component B according to the mass ratio of 100-200: 100, wherein the component Ais a prepolymer which is prepared by reacting high-temperature-resistant polyester polyol with polyisocyanate and has the NCO content of 15-20wt%; the component B is prepared from castor oil modifiedpolyester polyol, polyether polyol B and an anti-hydrolysis modifier. The steaming-resistant bi-component solvent-free polyurethane laminating adhesive has the advantages of being environmentally friendly, low in viscosity, high in peel strength and resistant to high-temperature steaming, still has very high peel strength after being steamed by steam at 135 DEG C, and is particularly suitable fora flexible package film co