Flame-retardant bi-component polyurethane adhesive and preparation method thereof

The invention relates to a flame-retardant bi-component polyurethane adhesive and a preparation method thereof. A soft and hard segment co-flame-retarding polyurethane modification method is adopted to prepare an isocyanate group component A and a polyhydric alcohol component B, wherein the component A is prepared from diisocyanate, polyhydric alcohol containing flame-retardant groups and a reactive flame retardant, and the component B is prepared from a chain extender, a crosslinking agent, polyhydric alcohol containing flame-retardant groups and a reactive flame retardant; the component A and the component B are mixed according to a certain proportion and cured, and then the polyurethane adhesive material with good flame retardance is obtained. The initial proportion can be adjusted freely to improve the mechanical property of the polyurethane adhesive material; besides, the overall properties including the flame retardance, the mechanical property, the working life and the like are more excellent; in addit