▎ 摘　　要

NOVELTY - Polyurethane comprises 4.8-7.5 pts. wt. polyether 330N, 0.5-1.0 pts. wt. toluene diisocyanate, 0.1-0.35 pts. wt. curing agent, 0.001-0.005 pts. wt. catalyst, 0.001-0.005 pts. wt. amino functional silane modified graphene oxide, 0.002-0.007 pts. wt. beta-cyclodextrin modified chitosan, 0.03-0.25 pts. wt. filler, 0.05-0.2 pts. wt. pigment and 0.45-1 pts. wt. viscosity reducing and toughening agent. USE - The polyurethane that is useful for filling hydraulic construction concrete expansion joint (claimed). ADVANTAGE - The polyurethane: provides good anti-seepage performance, and provides good elastic and mechanical properties to meet the filling needs of expansion joints. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the polyurethane comprising dropping the toluene diisocyanate into the polyether 330N and stirring evenly, adding the rest of the raw materials, mixing evenly, and reacting at 70-80°C for 0.5-1 hour.