Preparation and characterization of polyurethane composite modified epoxy resin for novel colored anti-skid pavement materials

To develop a bonding material suitable for colored anti-skid road surfaces, this study prepared a composite modified epoxy resin by modifying epoxy resin with polyurethane, nano-SiO2, and diluent 669. The mechanical properties of the composite modified epoxy resin were evaluated through tensile and bending tests. The results indicate that the tensile strength and bending strength of the composite modified epoxy resin increased by 6.23 % and 23.96 %, respectively, compared to pure epoxy resin. The elongation at break and bending deformation were enhanced by 94.6 % and 8 mm, respectively, compared to pure epoxy resin. The modified epoxy resin exhibited increased toughness and improved strength after modification. Thermal gravimetric analysis demonstrated that the thermal stability of the composite modified epoxy resin was superior, with a decomposition temperature 21 °C higher than that of pure epoxy resin. Through infrared spectroscopy and SEM analysis, it was revealed that during the modification process, polyurethane was chemically grafted onto the epoxy resin, while nano-SiO2 and diluent 669 contributed to physical modification of the epoxy resin.