Studies On The Effects Of Silica Modification And Its Segregation In Blends On The Abrasion Resistant

Abrasion resistance of rubber products are a very important indicators, and also a very important research focus for tribology. Detail investigations on the effects of the silica-rubber interaction and the segregation of silica in the different phase on the properties of rubber abrasion are very important to prepare high wear-resisting rubber and reveal the rubber abrasion mechanism.Firstly, three kinds of SBR (SSBR2557A, SSBR72606ESBR1502) were used as matrix, in order to investigate the effects of silica contents and surface modification on the rubber abrasion properties. And then, the silica segregation behavior in SSBR/BR, SSBR/NR and SSBR/ESBR blends under different mixing process were studies, and the effects of this segregation on the processing, mechanical and abrasion properties were discussed.The results showed that, with the increase of silica contents, the Mooney viscosity, the maximum and minimum torque of these three compounds were all significantly increased, so did their curing time. For Akron abrasion, the abrasion resistance of ESBR1502had nearly linear increase with increase of silica contents; however the abrasion resistance was highest when silica is40phr for SSBR72606and SSBR2557A. The silica contents had little effects on the DIN abrasion loss of ESBR1502, while had greater effects on that of SSBR2557A and72606.Ionic liquid can improve the interaction between silica and rubber. The physic-mechanical properties were better when [AMIM] Cl was1.0phr and1.5phr, so did its abrasion resistance. And for [BMIM] Cl, its optimal amount was o.5phr and 1.0phr, with the best abrasion resistance. The Akron abrasion resistance decreased when two kinds of nanoprene were added, however they had little effects on the DIN abrasion resistance.For SSBR2557/BR9000blends, as observed from RPA analysis, the compounds with the mixing processes of SSBR (MB)/BR and SSBR/BR (MB) have lower Payne effects, which indicated that these two methods have better dispersion of silica. This is confirmed by the TEM results. The compounds of SSBR(MB)/BR has a higher wear resistance, with its tan δ being higher at0℃, and lower at60℃. For SSBR2557A/NR blends, the Payne effect of SSBR (MB)/NR compounds was similar to that of SSBR/NR (MB) compounds. The Payne effects for both of the two compounds are lower than that of SSBR/NR and SSBR (MB)/NR (MB), and their tear resistance and Akron abrasion resistance were also better. For SSBR2557A/ESBR1502, the compound of SSBR (MB)/ESBR had lower Payne effect and better dispersion of silica, and the mechanical properties, wet skid resistance DIN abrasion resistance of the vulcanizates were also best.