The Application Of ENR And Graphene Nanoplatelets In SSBR/BR And BIIR

With the rapid development of tire industry,the development of high-performance tires has become the mainstream trend of tire industry.High performance tire tread rubber should not only has excellent anti-slip,low rolling resistance,high wear resistance,but also has good anti-static performance and thermal conductivity.Epoxidized natural rubber(ENR)has high wet skid resistance,low rolling resistance and outstanding air permeability.Graphene nanoplatelets(GNPs)is multilayer graphene materials with excellent mechanical properties,electrical conductivity and thermal conductivity.Therefore,the effects of ENR and GNPs on tire tread rubber and inner liner are discussed.Firstly,the influence of epoxidation degree of ENR on the structure and the properties of silica-filled SSBR/BR composites are studied.The results show that the Mooney viscosity,the minimum torque(ML)and the maximum torque(MH)of the ENR/SSBR/BR composites enhance with the increase of the degree of epoxidation,and the vulcanization time of the ENR/SSBR/BR composites is shortens and the hardness and 100%,300%modulus of vulcanizate increase.The RPA and SEM analysis show that the silica is more homogeneous in the rubber with the increase of the degree of epoxidation.The FTIR analysis shows that the silica react with the epoxy group;the DMA dynamic performance analysis shows that ENR40/SSBR/BR composites have remarkable wet skid resistance.Secondly,the effects of graphene nanoplatelets dosage on the structure and the properties of silica-filled SSBR/BR composites are investigated.The results indicate that graphene nanoplatelets can form filler network in the compound with the increase of the amounts.The network structure can transfer the heat and charge more effectively,which can promote the thermal conductivity and electric conductivity of the composites.ENR40/GNPs/SSBR/BR composites not only had excellent wet skid resistance,but also improved the wear resistance and compression fatigue temperature rise.The effects of epoxidation degree of natural rubber on the structure and the properties of carbon black filled BIIR composites are studied.The results reveal that with the increasingepoxidation degree,the Mooney viscosity of BIIR compound decreases and the scorch time and vulcanization time shorten gradually,the Shore A hardness,100% modulus and 300%modulus of vulcanizate enhance gradually,the compression set of vulcanized rubber and the heat of compression fatigue decrease.Besides,air tightness analysis shows that ENR50/BIIR and ENR40/BIIR composites have lower airtightness than pure BIIR.Finally,the influence of graphene nanoplatelets dosage on the structure and the properties of carbon black filled BIIR composites are studied.The results show that with the addition of graphene nanoplatelet dosage,the Mooney viscosity of the compound gradually increases,the scorch time and vulcanization time are gradually shorten,the Shore A hardness,100% modulus and 300% modulus of vulcanizate increase accordingly.In addition,the tensile strength,tear strength of vulcanizate show a trend of increase first and then decrease with the increase of graphene nanoplatelet.The thermal fatigue performance and the anti-static property of the composites gradually increase,and the gas tightness of the composites increases and then decreases.Compared with pure BIIR vulcanizate,the gas permeability of ENR/GNPs/BIIR vulcanizate was reduced by 6% and the gas permeation coefficient was reduced by 9%.