▎ 摘　　要

NOVELTY - A high flame-retardant polyurethane sealant comprises 35-60 %mass polyurethane prepolymer, 5-15 %mass expandable graphite, 5-25 %mass powder flame retardant, 5-10 %mass nitrogen-doped graphene, 0.1-2 %mass catalyst, 0.1-2 %mass adhesion promoter and 0.1-2 %mass water removal agent. The expandable graphite has particle diameter of 5-10 microns and expansion ratio of 150-200%. USE - High flame-retardant polyurethane sealant. ADVANTAGE - The high flame-retardant polyurethane sealant has excellent working performance and tensile strength of 8.2 MPa or less, and is prepared efficiently by simple method without using special instruments. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of high flame-retardant polyurethane sealant.