Study On The Preparation Of CNFs Modified Oxide Nanocomposttes And Its Reinforcement Of HNBR Performance

At present,new materials used in the aviation field are developing rapidly,and the mechanical strength of existing rubber composites is too low,to meet the growing demand for aviation materials.Therefore,rubber is usually reinforced added with fillers to improve its mechanical properties.Carbon nanofibers(CNFs),as an emerging material with excellent physical properties,can improve the tensile strength,tear strength and Young’s modulus of the rubber material when it is filled into rubber.Self-entanglement is not conducive to the improvement of rubber performance.Silica is environmentally friendly and has good reinforcement effects.Titanium dioxide has non-toxic,good whiteness and excellent ultraviolet shielding effect.Alumina has the advantages of high hardness and fire resistance,which can improve the performance of rubber materials.On the basis of CNFs,three different nano-scale composites materials were prepared by selecting silica,titanium dioxide and alumina trioxid,and filling them as fillers into hydrogenated nitrile rubber(HNBR).Conduct structural characterization and performance tests.1.Prepare silica-carbon nanofibers(SiO2-CNFs)nanocomposites by electrostatic self-assembly method,and fill them into HNBR to obtain SiO2-CNFs/HNBR rubber composites.The results show that SiO2 is loaded onto the surface of CNFs through electrostatic adsorption,which can significantly reduce the agglomeration of SiO2 and improve the dispersion of nanocomposites in rubber.When the mass percentage of CNFs is 4%and the filling fraction is 50phr,the tensile strength of SiO2-CNFs/HNBR is the largest(26.7 MPa),the elongation at break reaches 445%,and the tear strength reaches 43.7 kN/m.It has the best comprehensive mechanical properties,and is significantly better than SiO2/HNBR and CNFs/HNBR rubber materials.2.Prepare titanium dioxide-carbon nanofibers(TiO2-CNFs)nanocomposites by sol-gel method and fill them into HNBR to obtain TiO2-CNFs/HNBR rubber composites.The results show that loading TiO2 on the surface of CNFs can significantly reduce the agglomeration of TiO2 nanoparticles and improve the dispersion of nanocomposites in rubber.TiO2-CNFs nanocomposites has a strong UV shielding effect and improves the absorption of visible light.When filled with 50phr 4%TiO2-CNFs nanocomposites,HNBR rubber composites has the highest tensile strength,reaching 25.37 MPa,and tear strength reaching 28.1 kN/m,which has the most excellent comprehensive mechanical properties.3.The alumina trioxid-carbon nanofibers(Al2O3-CNFs)nanocomposites was prepared by the sol-gel method and filled into HNBR to prepare the Al2O3-CNFs/HNBR rubber composites.The results show that after Al2O3 is loaded on the surface of CNFs,the distribution is uniform,the agglomeration phenomenon is reduced,and the dispersibility of the Al2O3-CNFs nanocomposites in the rubber is improved.When filled with 40phr 3%Al2O3-CNFs,HNBR rubber composites has the highest tensile strength,reaching 23.9 MPa,tear strength reaching 48.7 kN/m,and abrasion resistance is greatly improved.At this time,it has the best comprehensive mechanical properties,and is obviously better than Al2O3/HNBR and CNFs/HNBR rubber materials.