| Carbon fiber/epoxy resin composite plays a great role in the strengthening and reinforcement of buildings,aeronautics and astronautics,transportation and other fields.However,due to the hydrophilicity of epoxy resin,the surface of carbon fiber/epoxy resin composite is far from reaching the superhydrophobic effect.The poor hydrophobicity of composite surface will lead to the continuous infiltration of moisture,which seriously threatens the service life of composite and reinforced buildings.Therefore,this paper designs and fabricates a wear resistant,acid-alkali resistant,self-cleaning functional superhydrophobic carbon fiber/epoxy resin composites by a simple dip-coating method.The main contents and conclusions of this paper are as follows:(1)A wear resistant carbon fiber/epoxy resin composite with a sustainable superhydrophobic surface is successfully fabricated by deeply immersing the etched and amino-silicone oil(APDMS)treated carbon fiber fabric in the epoxy resin solution containing fluorinated ethylene propylene(FEP),hydrophobic Si O2 nanoparticles,and polyurethane(PU).With 40 wt.% FEP and 6 wt.% PU,the composite surface displays the optimum superhydrophobic performance with a water contact angle of 151.9±1.2°.Tribological test indicates that the composite possesses lower wear rate 0.58×10-13m3/N·m and friction coefficient 0.318.Even after 120,000 cycles of abrasion,the obtained composite surface still keeps a sustainable high hydrophobic behavior with a contact angle of 148±1.7°.Meanwhile,the composite surface exhibits satisfying self-cleaning property in the muddy water.(2)A wear resistant and acid-alkali resistant S-E-carbon fiber/epoxy resin composite with a sustainable superhydrophobic surface is successfully fabricated by deeply immersing the etched and St?ber method treated carbon fiber fabric in the epoxy resin solution containing polyfluoroalkoxy(PFA).With 45 wt.% PFA,the composite surface displays the optimum superhydrophobic performance with a water contact angle of 151.6±1.6°.With the same PFA content,the modified carbon fiber/epoxy resin composite always shows better hydrophobicity than the unmodified composite.Tribological test shows that the surface of composite still maintains high hydrophobic behavior with a contact angle of 140.9±1.9° after120,000 cycles of abrasion.Moreover,with the chemical corrosion resistance of PFA and barrier protection of epoxy resin,the composite exhibits excellent acid-alkali resistance.(3)After modification with dopamine,the carbon nanotubes are grafted onto carbonfibers.Then,the modified carbon fibers are solidified with the epoxy resin solution containing polytetrafluoroethylene(PTFE).After modification with APDMS,a wear resistant CNT-PDA-carbon fiber/epoxy resin composite with a sustainable superhydrophobic surface is successfully fabricated.With the same PTFE content,the modified carbon fiber/epoxy resin composite always has a larger contact angle.With 30 wt.% PTFE,the composite surface modified by APDMS for 30 min reaches superhydrophobic performance with a contact angle of 153.7±1.8°.Tribological test shows that the wear rate of composite continues to decrease.Moreover,the surface of composite still reaches the high hydrophobic behavior with a contact angle of 144.1±2.1° after 120,000 cycles of abrasion. |
