| In this paper, microstructure and basic properties of three different types of BIIRincluding domestic Brominated butyl rubber (BIIR2032) and two foreign types ofBIIR were studied by with different means, such as Br contents, Molecular weight andits distribution, the infrared spectra, thermal stability, elemental analysis, Mooneyviscosity, the cure characteristics, mechanical properties and dynamic mechanicalproperties of vulcanizates. To satisfy the performance requirements of tubeless tyreinner liner formula application, the curing system, reinforcing system, anti-scorchingsystem of BIIR2032were optimized designed. In addition, the optimized ratio of BIIR2032and natural rubber (NR) on the performance of the blends was researched. Tostudy heat-resisting performance of BIIR2032, effects of different hot-air agingtemperature on the structure and properties of BIIR2032were researched.The results showed that, firstly, during three types of BIIR, BIIR2032had thehighest Br content, the lowest Tg, narrower molecular weight distribution and its highmolecular weight portion content was lower. It had the lowest Mooney viscosity, fastercuring rate, higher degree of crosslinking, poor processing safety. BIIR2302vulcanizates had poor oxygen tightness. And its comprehensive performances wereclose to BIIR2222, BIIR2030.Secondly, the curing system was ZnO/S improved by DM and the optimized ratioof the curing systems was got. Besides, orthogonal design method were adopted thusthe optimized formula with suitable optimum cure time, proper scorch safety and basicproperties,was found out. The results showed that the optimal cure temperature was160℃. Thirdly, BIIR2032vulcanizates filled with different carbon blacks and differentdosages had Payne effect. The more loading and the smaller carbon black particle sizein compounds, the more obvious Payne effect appeared，the smaller the loss factorpeak, the narrower the peak width.The smaller particle size was favorable forreinforcement but not conducive to decentralization or processing. Carbon blacks withlarge particle size would lead to the prolongation of cure time and decreased theoxygen tightness. Comprehensive consideration, BIIR2032filled with60phr N660could get balanced performance.Fourth, along with the increase of the ratio of NR, processing performance ofBIIR2032/NR which was easy stick with roller, became poor. Degree of crosslinkingincreased. Tensile strength of the vulcanizates increased while the gas tightnessdecreased. As the ratio of BIIR/NR changed, dynamic mechanical properties of thevulcanizates were different.Finally, with the increase of hot-air aging temperature, hardness and modulus at300%increased, elongation at break of BIIR2032vulcanizates decreased, while tensilestrength increased at first and then decreased. High temperature destroyed the fillernetwork, changed the dynamic mechanical properties of rubber. ATR-FTIR spectra ofBIIR2032vulcanizates after aging indicated that oxygen participated in the agingprocess and high temperature aging increased unsaturation degree of rubber. |
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