Study On The Application Of Environmental-friendly SSBR In Tread

Environmental-friendly SSBR72612S and SSBR2564S as well as silica1165MPwere the main research objects and multiple interactions in filled vulcanizates and theinfluence on performance were studied. Silylating agent DPG feed sequence and theinfluence on interaction between SSBR and silica are firstly investigated,and then theproperties of different blending ratio system between the two SSBR and BR、NR、ESBR and the effect of silica1165MP network structure on the macroscopic propertiesof rubber were analysed, the interaction between SSBR and silica/carbon black and theinfluence of different blending ratio of silica1165MP/carbon blackN330on themechanical properties and dynamic performance were further explored. The influenceof multiple network structure on the macroscopic properties of rubber was analyzed foreach system.Therefore, appropriate tread formulation was optimized by changing theproportion of rubber species and composite filler and regulating multiple networkstructure.The results of the correlation between feed sequence of accelerator DPG andproperties showed: silylation reaction between silica and silane coupling agent wasaccelerated and the interaction between SSBR and silica was strengthened whenaccelerator DPG was added in high-temperature mixer stage; at this time the basicproperties of SSBR were better than that DPG was added in low-temperature mixerstage, wet skid resistance became worse and rolling resistance became slightly lower.The results of the correlation between SSBR2564S blended with BR、NR、ESBRand properties showed: the basic physical and mechanical properties were somewhatimproved with the addition of BR、NR、ESBR increased; wet skid resistance wasworse with universal rubber increased,and the addition of BR、NR had advantage onreducing rolling resistance,but ESBR had little effect;wear resistance of blends wassignificantly improved with the addition of BR,but SSBR and NR had poorcompatibility and wear resistance. The results of strain sweep of vulcanizates for eachsystem showed that the dispersion of filler was poor by blending universal rubber. Thecontent of bound rubber increased with SSBR increased in blends of SSBR/BR andSSBR/ESBR and the content of bound rubber changed little with SSBR increased in blend of SSBR/NR; in the same ratio the content of bound rubber was least ofSSBR/ESBR blends. The results of cross-linking density by equilibrium swellingshowed that cross-linking density increased and molecular weight betweencrosslinking points decreased with SSBR decreased.The results of the correlation between SSBR72612S blend system and propertiesshowed:physical properties were improved with the addition of BR、NR、ESBR,thethree blend system had low rolling resistance, the wet skid resistance of SSBR/NRsystem and SSBR/ESBR system were better than SSBR/BRsystem.Wear resistance ofblends was improved with the addition of BR. The results of strain sweep of compound、SEM analysis of vulcanizate and the content of bound rubber for each system showedthat the interaction was stronger between rubber and silica as the level of SSBR72612Sincreased,the dispersion of filler of SSBR/BR system was better than SSBR/ESBR andSSBR/NR system. The cross-linking density by equilibrium swelling for each systemwas totally higher than SSBR2564S blend system,but the two SSBR blend systemhad consistent trend.The results of the correlation between different blending ratio of silica/carbonblack and properties showed: the interaction between rubber and filler was strongerand wear resistance was improved in the SSBR/silica/carbon black system as theaddition level of silica increased while the total filler amount was kept constant，otherdynamic performance had improved except wet skid resistance of SSBR2564S system.The results of the content of bound rubber、SEM analysis of vulcanizate、longitudinalrelaxation time T2and the cross-linking density by equilibrium swelling showed thatthe interaction between rubber and filler was stronger with silica increased,especiallythe interaction between the partial end group silane coupling SSBR72612S and fillerwas further strengthened.The results of comparison between SSBR72612S system and SSBR2564S systemshowed: SSBR72612S had high molecular weight、narrow distribution and the chainend of silicon coupled, and these structures reduced the silica network level andenhanced the silica-SSBR72612S interaction, therefore the physical mechanicalproperties and dynamic mechanical properties were improved, rolling resistance waslower、abrasion resistance was better and wet skid resistance was worse,SSBR72612Spossessed the better consolidated balance among wet traction、rolling resistance andabrasion resistance.Therefore, the appropriate blending ratio of rubber species and silica/carbon blackwere recommended to get consolidated balance among wet traction、rolling resistanceand abrasion resistance according to the actual requirement.