Flame-retardant modified polyurethane adhesive and construction method thereof

The invention relates to the field of constructional engineering, in particular to a flame-retardant modified polyurethane adhesive which comprises the following components in parts by weight: 396-410 parts of a white material, 180-200 parts of a black material, 65-70 parts of dimethyl ether and 80-90 parts of propane and butane, wherein isocyanate is selected as the black material; the white material is prepared from the following components in parts by weight: 278 to 300 parts of polyether polyol, 25 to 30 parts of silicone oil, 12 to 15 parts of a single-component catalyst, 100 to 120 parts of TCPP, 40 to 50 parts of melamine, 80 to 100 parts of expanded graphite, 4 to 6 parts of BS and 441 to 500 parts of paraffin. The invention also provides a construction method of the flame-retardant modified polyurethane adhesive. The polyurethane adhesive provided by the invention can replace cement adhesive mortar, is more energy-saving and environment-friendly, reduces the construction difficulty and can improve th