Study on preparation of epoxy composites for mining structural support
The composite material for mining structure support was prepared with epoxy resin as the main material.The effects of different curing agents,toughening agents,fillers,reinforcing fibers and antistatic agents on the system operability and material properties were studied through the tests of gel time,mechanical properties and surface resistance.The results showed that the gel time of the curing agent had a great influence on the operability of the composite.The amine modified curing agent with low viscosity,long operation period and room temperature curability was preferred.The addition of reinforcing fibers could increase the impact strength of composite materials to 62.35 kJ/m2,flexural strength to 142.2 MPa,compression strength to 103.9 MPa,and meet the flame retardant requirements of VO level.Spraying epoxy conductive coating on the surface of composite materials could significantly reduce the surface resistance of the material,reaching 1.2 × 104 Ω.The failure load of epoxy composite material support column shoes prepared based on the above basic formula could reach 503 kN,and meet the flame retardant and anti-static requirements of structural support products.
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