The invention relates to hyperbranched poly-blend soft-segment modified chain extension anti-flaming waterborne
polyurethane, which belongs to the field of
flame retardant materials. The waterborne
polyurethane is prepared by the following steps of after dehydrating
macromolecule polyhydric
alcohol, adding a hydrophilic chain
extender and diisocyanate, reacting until -NCO content is constant, adding a
phosphorus containing polyhydric
alcohol macromolecule until -NCO content is constant, and adding a salt-forming agent A to obtain a
prepolymer; adding water into the
prepolymer, adding an
acetone /
butanone / N-methyl pyrrolidone solution of a
phosphorus-containing
diamine chain
extender after adding water, and obtaining an
emulsion; adding the
emulsion into an AWHBPU water solution neutralized by a salt-forming agent B for emulsifying, spin-evaporating to remove a
solvent, and obtaining the waterborne
polyurethane. The waterborne polyurethane is subjected to soft-segment anti-flaming modification, so that a
flame retardant property is improved, and the waterborne polyurethane is
halogen-free and environmentally-friendly; through chain extension modification, a
flame retardant property is improved, a
mechanical property is improved, and the stability is improved; through blending the AWHBPU and the chain extension anti-flaming waterborne polyurethane, a
mechanical property and the stability are further improved.