Effect of Mooney viscosity of raw rubber on properties of styrene-butadiene rubber 1500 and 1586

The effects of Mooney viscosity of raw rubbers (Mv) of SBR 1500 and SBR 1586 on the properties of SBR 1500 and SBR 1586, such as Mooney viscosity of rubber compounds (Mb), modulus at 300% 25 min (M25), modulus at 300% 35 min (M35), modulus at 300% 50 min (M50), tensile strength (Ts) and elongation at break (Eb) of vulcanizates were investigated. The results showed that with the increase of Mv, Mb, M25, M35, M50, Ts and Eb of SBR 1500 and SBR1586 all increased linearly. When Mv increased by 1 unit, Mb, M25, M35, M50, Ts and Eb of SBR 1500 increased by 1.17, 0.11 MPa, 0.27 MPa, 0.56 MPa, 0.16 MPa and 2.8% respectively, and Mb, M25, M35, M50, Ts and Eb of SBR 1586 increased by 1.00, 0.08 MPa, 0.10 MPa, 0.57 MPa, 0.20 MPa and 3.8%. When the increase ranges of Mv of SBR 1500 and SBR 1586 were the same, the growth rates of Mb, M25 and M35 of SBR 1500 were higher than those of SBR 1586, and the growth rate of M50 of SBR 1500 was equal to that of SBR 1586, while Ts and Eb of of SBR 1500 were lower than those of SBR 1586.