Researching On Processing Properties Of National-Newly-Produced Rubber SIBR And Nd-IR

Yanshan Petro-chemical Corporation's recently produced Integral rubber SIBR , which is also known as the third generation S-SBR, randomly terpolymerized by styrene, butadiene and isoprene, togethering high anti-abrasion property, low rolling resistance property and high anti-wetted property within a single rubber material, is an excellent tire tread rubber with high performances and precious value of market. In the meantime, this company's newly synthesized Isoprene Rubber Nd-IR, which is catalyzed by rare earth element Nd, with a cis-1,4 content approximately equal to that of NR, is also a concerning rubber due to its potentially wide uses to take the place of NR.This work, with its experiment means of raw rubber's performances on two-roll mills, the measurements of Mooney viscosity under different mastification extents, HAAKE torque analysis, RPA frequency, temperature and strain sweeps and extrusion experiments under capillary die, choosing comparison sample NR and Ti-IR for Nd-IR, SBR1502 and SBR1712 for SIBR2505 and SIBR2535, respectively, aims to make some necessary theoretical references and evidences to help to boost and apply these three new type of rubbers in practical producing and manufacturing, mainly investigated and analyzed the two-roll mills performances of SIBR2505 and SIBR2535, the changes of Mooney viscosity with storage time going on, the anti-degradation properties of SIBR2505, SIBR2535 and Nd-IR's both raw rubber and mixed rubber, the variation of torque, temperature rises and energy consumption during mastification and mixing process, the strength of rubber, plasticity, sensitivity to temperature and carbon dispersity by RPA frequency, temperature and strain sweep, as well as changes of shear viscosity with shear viscosity and temperature, non-Newton index, surface morphology and die swell ratio during extrusion under capillary die.The results show that SIBR2505 has a good rolling performance under the whole range of experimental temperature while SIBR2535 performs good above 60℃;due to gradual degradation on the terminal of the macromolecular chain, the mastificated SIBR raw rubber's Mooney viscosity shows decreasing trend during storage; both raw rubbers'and mixed rubbers'plasticity are modified with temperature rising up; Nd-IR's and SIBR's HAAKE torque value and fluctuation extent are lower than that of NR, Ti-IR and SBR, respectively, as well as heat building-up and energy consumption; the shear viscosity of Nd-IR, which drops sharply between 80 and 100℃, with a low sensitivity to temperature, is lower than that of NR and Ti-IR; the shear viscosity of SIBR2505 and SIBR2535 with a low sensitivity to temperature is lower than that of SBR1502 and SBR1712, respectively; Mixed NR, Nd-IR and Ti-IR with a great elastic effect show spiral distortion during extrusion process while SBR perform a evident die swell and SIBR show a slight die swell; loss factor tan obtained from RPA has a relationship with die swell and surface morphology obtained from capillary rheometer to some extent.