Research on Preparation and Properties of Polyurethane Epoxy Modified Asphalt
Epoxy resin has strong brittleness and low flexibility,resulting in poor crack resistance of epoxy asphalt.In order to improve the low-temperature performance of epoxy asphalt,toughening modification is required.In this paper,polyurethane/epoxy resin composite materials are obtained by using self-synthesized polyurethane for epoxy resin modification,and polyurethane/epoxy resin composite materials are used for asphalt modification.The dosage and modification mechanism of polyurethane modified epoxy are determined through microscopic and macroscopic tests.The viscosity characteristics and microscopic phase analysis of polyurethane/epoxy modified asphalt are evaluated,and the optimal dosage of polyurethane/epoxy is determined through its mechanical properties.The results show that the isocyanate group in polyurethane would chemically graft onto the hydroxyl group in epoxy,increasing the chemical crosslinking point,and improving the toughness of epoxy resin,and the optimal content of polyurethane is 20％.The viscosity test results show that the viscosity of modified asphalt with different polyurethane epoxy content gradually increases with time.The higher the polyurethane epoxy content,the faster the viscosity of modified asphalt increases.The tensile test shows that when the content of polyurethane epoxy is 40％,its mechanical properties are excellent and meet the specification requirements.
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