▎ 摘　　要

NOVELTY - Polyurethane hot melt adhesive comprises 20-40 pts. wt. polyether polyol, 30-50 pts. wt. amorphous polyester polyol, 10-40 pts. wt. crystalline polyester polyol, 0.01-0.1 pt. wt. phosphoric acid, 0-1 pt. wt. antioxidant, 1-2 pts. wt. coupling agent, 1-2 pts. wt. graphene and 20-30 pts. wt. isocyanate. USE - The polyurethane hot melt adhesive is useful in breathable composite material (claimed). ADVANTAGE - The polyurethane hot melt adhesive distributes graphene in a honeycomb lattice structure, which can be used as a heat conductor, and thus conducts heat from the inside of protective clothing to outside to improve air permeability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the polyurethane hot melt adhesive, comprising mixing polyether polyol, amorphous polyester polyol, crystalline polyester polyol, antioxidant, coupling agent and graphene, heating and then performing vacuum dehydration, cooling, adding phosphoric acid, continuously cooling, adding isocyanate under nitrogen atmosphere, reacting and discharging to obtain polyurethane hot melt adhesive.