Preparation And Research Of Graphene/nitrile Rubber Composites

Nitrile rubber(NBR)is widely used in the preparation of oil seal devices due to its excellent oil resistance.The unsaturated structure of its main chain makes the aging phenomenon more serious in the process of storage and use.The hydrogenated nitrile butadiene rubber(HNBR)can meet the demand of demanding environment better,but it is expensive.Because of its unique two-dimensional structure,graphene not only has a good reinforcing effect on rubber,but also has a certain physical barrier.However,large surface energy makes it is not easy to be evenly dispersed in the polymer matrix.Spherical or tubular particles with dispersive properties were used to compound graphene,and on this basis,some chemical modification for aging prevention was carried out.Different composite particles in the dispersed state of NBR composite materials,and composite particle on the properties of NBR medium resistance were investigated,which can be applied for graphene preparation has good resistance to aging properties of NBR composites.In addition,the effect of the addition of composite particles on the conductivity of NBR was investigated,which can provide a reference for the preparation of graphene/NBR conductive composites.By in situ deposition,surface grafting modification and the methods of in situ intercalation respectively,the preparation of graphene/ferroferric oxide(G/Fe3O4),silane coupling agent chemical graft antiager modified silica/graphene(Fe3O4-SiO2-KH560-RT-G),graphene oxide/halloysite(GO/HNT)composite particles,and using FTIR,SEM.XRD,TGA analysis methods,such as the preparation of composite particles structure were characterized.NBR composites were prepared by means of solution,mechanical and emulsion blending.The effects of the composite particles on the mechanical properties,thermal oxidative aging resistances of the composites were also investigated.The tensile properties of NBR composites were tested.The results showed that the tensile strength of NBR composites increased first and then decreased with the increase of the content of G/Fe3O4,Fe3O4-SiO2-KH560-RT-G and GO/HNT composite particles.When the contents of G/Fe3O4,Fe3O4-SiO2-KH560-RT-G and GO/HNT composite particles were respectively 0.8phr,5phr and 3phr,the mechanical properties of NBR composite were better.SEM results of NBR composites show that the G/Fe3O4,Fe3O4-SiO2,KH560-RT-G,GO/HNT composite particles are well dispersed in the NBR composite substrate,graphene and spherical particle composite,GO and particle composite tubular structure,assisted by spherical,tubular structure particle dispersion effect can make(oxide)graphene evenly dispersed in the composite matrix.The experimental results of accelerated thermal oxygen aging of NBR composite material showed that the aging coefficient of NBR composite material was higher than that of the unfilled NBR vulcanizate after the introduction of G/Fe3O4 and Fe3O4-SiO2-KH560-RT-G composite particles.While the aging coefficient of NBR/GO/HNT composite material was lower than that of the unfilled NBR vulcanizate.The composite particles G/Fe3O4,Fe3O4-SiO2-KH560-RT-G and GO/HNT can be well dispersed in the NBR composite material.and have a strong interaction with the matrix,which has a good reinforcing effect on the NBR composite material.The addition of G/Fe3O4 and Fe3O4-SiO2-KH560-RT-G can effectively improve the thermal oxidative aging resistances of NBR composite.Graphene is coated on the surface of Fe3O4.and the three-dimensional structure of Fe3O4 is more conducive to the formation of graphene conductive network.The conductivity of NBR/G/Fe3O4 composite was 3 orders of magnitude higher than that of NBR/G composite when the same content of graphene was added.