Properties of High Mooney Viscosity NdBR/SSBR/NR Tread Compound
Based on the tread compound formula of steel-belted radial tire,two kinds of high Mooney viscosity neodymium butadiene rubber(NdBR,denoted as NdBR-1# and NdBR-2#,with Mooney viscosities of 67 and 72,and relative molecular mass distributions index of 3.26 and 2.31,respectively)were blended with solution polymerized styrene-butadiene rubber(SSBR)and natural rubber(NR),using nickel butadiene rubber BR9000 and NdBR CB22 as the comparison samples,and the properties of high Mooney viscosity NdBR/SSBR/NR tread compounds were investigated.The results showed that,when BR/SSBR/NR were blended,high Mooney viscosity NdBR had obvious application advantages.The comprehensive performance of NdBR-2# compound was better than that of NdBR-1# compound,the physical properties,rolling resistance,and dynamic mechanical properties were comparable,especially the crack growth resistance,cutting resistance,and aging resistance were outstanding,obviously superior to that of CB22 compound.NdBR-2# was more suitable for the BR/SSBR/NR tread formulation system.