In　this　study,　we　synthesized　a　novel　polyurethane　(PU)　curing　agent　(CA)　modified　by　the　diazafluorene　derivative,　9,9′-di(4-hydroxyphenyl)-9-1H-4,5-diazafluorene,　at　different　hydroxyl　ratios.　The　results　of　1H-NMR　and　Fourier　transform　infrared　spectroscopy　proved　the　structure　of　the　fluorine　derivative　and　the　modification　of　CAs.　Differential　scanning　calorimetry　and　dynamic　mechanical　analysis　showed　that　the　glass-transition　temperature　of　the　PU　increased　with　the　addition　of　the　diazafluorene　derivative,　and　the　PU　cured　in　the　novel　CA　had　more　stable　and　better　damping　properties　under　moderate-temperature　conditions　(30–80　°C)　than　the　PU　cured　in　the　N75　CA.　Tan　δ　was　maintained　in　a　relatively　lower　range　shift　in　the　moderate-temperature　range.　The　average　adhesion　values　of　the　PU　coating　cured　in　the　novel　CA　increased.　The　scanning　electron　microscopy　morphologies　of　the　PU　film　and　the　average　adhesion　of　the　coatings　showed　that　the　PU　cured　in　the　novel　CA　had　good　mechanical　properties.　©　2018　Wiley　Periodicals,　Inc.　J.　Appl.　Polym.　Sci.　2018,　135,　46591.　©　2018　Wiley　Periodicals,　Inc.