Study On The Erosion Wear Of Modified Epoxy And Its Composites

The concrete structures which locate in the strong wind flow environment, such as concrete bridge pier, the beam bodies and so on, are often suffered from erosive wear by sand flow, and other diseases, which severely reduce the durability of the concrete structure. So it is necessary to protect the concrete structures in the wind-blown sand flow environment.Epoxy resin is a commonly used material which is used to strengthen and repair concrete structure, and naturally is used to protect the concrete structures under the environment of erosive wear. However, epoxy resin is a kind of thermosetting resin, with high cross-linking degree as well as the tendency of brittleness and cracking after curing. Therefore, it is necessary to modify its toughening.In this paper, the epoxy resin was modified by asphalt, inorganic nanoparticles, nano-SiO₂/asphalt, nitrile and other flexibilizer respectively, and the modified epoxy resin matrix composites were prepared. The tensile strength, impact toughness, hardness and erosive wear resistance of the epoxy resin samples using different toughening ways were tested. The best proportions of the epoxy resin material were acquired through analysis and comparison, and the feasibility of using the epoxy resin matrix composite as erosive wear protective material was discussed.The conclusions of the full text are as follows :（1） The asphalt modifies epoxy resin. The composite material performance of the modified epoxy resin is the best when added 10% mass fraction of asphalt. The tensile strength is 35.0 MPa. The impact toughness is 1.30 J/cm². The shaw hardness is 76. Under the conditions of different parameters of erosion, the erosion rate is less than without asphalt or adding other proportions of asphalt samples.（2）Inorganic nanoparticles modify epoxy resin. The composite material performance of the modified epoxy resin is the best when added 1% mass fraction of nano SiO₂. The tensile strength is 41.0 MPa, which is higher than that of the epoxy resin modified by asphalt. The shaw hardness is 79. Under the same conditions of erosion, the erosion resistance is higher than other samples. The epoxy resin modified by nano Al2O3 in different mechanical properties is inferior to nano SiO₂.（3）Nano SiO₂/asphalt modifies epoxy resin. The comprehensive performance of the modified epoxy resin material is the best when added 1% mass fraction of nano SiO₂ and mass fraction of 10% asphalt. The tensile strength is 41.8 MPa. The impact toughness is 1.71 J/cm². Both are higher than adding nano SiO₂ or asphalt alone as toughening agent, and its erosion resistance is superior to them.（4）Nitrile and some other toughening agents modify epoxy resin. The comprehensive performance of the modified epoxy resin material is the best when added 10% mass fraction of nitrile rubber. The tensile strength is 38.1 MPa. The impact toughness is 1.35 J/cm². The shaw hardness is 78. The erosion resistance is higher than other samples. For other toughening agents, when added 20% mass fraction of the 103 F and 20% mass fraction of the P24 F flexibilizer, the toughening effects are the best, and the erosion resistance is good. While for other toughening agents, such as phthalic acid dibutyl, furfural/acetone, QS-BE or QS-BC, the toughening effects are not ideal.（5）Asphalt and nitrile modify epoxy resin matrix composites. The erosion resistance of epoxy resin matrix composites is the best when added 10% mass fraction of asphalt or 20% mass fraction of nitrile rubber toughening agent, and the erosion rate is far less than epoxy resin matrix composites without asphalt or nitrile.