| Metallic soap can not only effectively reduce the viscosity of the rubber composites,improve the processing performance,but can also promote the dispersion of filler,improve the mixing efficiency and reduce the energy consumption.In this paper,the effects of environmental processing agent magnesium soap and potassium soap on the processing rheological properties and other various properties of carbon black(CB)/NR and silica filled SSBR/BR rubber composites were discussed.In addition,the effects of zinc soap were also compared.Firstly,the effects of the content of magnesium soap on the properties of CB/NR composites were studied.The results showed that the energy consumption of CB/NR composites decreased first and then slightly increased with the increase of the content of magnesium soap,and the Mooney viscosity decreased while the relaxation rate ? increased with the increase of the content of magnesium soap.The results of capillary rheometer test showed that the flow activation energy of CB/NR composites decreased first and then slightly increased with the increase of the content of magnesium soap;In addition,the Shore A hardness,tensile strength and wear resistance of CB/NR composites decreased,while the tear strength and flexible temperature raise increased with the increase of the content of magnesium soap.The SEM results showed that the dispersion of CB in NR matrix was improved with the increase of the content of magnesium soap.Comprehensive consideration the processing rheological properties and mechanical properties,the best content of magnesium soap was 2phr.Then the effects of zinc soap,potassium soap and magnesium soap on the properties of CB/NR composites were compared.The results showed that the addition of metallic soap made the energy consumption,viscosity and Payne effect of CB/NR composites decrease,while the dispersion of filler improve.And the loss factor of CB/NR composites increased.In addition,the change of vulcanization performance,mechanical properties and aging properties of CB/NR composites was not obvious.Compared zinc soap,potassium soap and magnesium soap,potassium soap made the most difference to the improvement of rubber processing performance.Subsequently,the effects of zinc soap,potassium soap and magnesium soap on the properties of SSBR/BR composites were compared.The results showed that the metallic soap improved the mobility of the SSBR/BR composites and the dispersion of the silica.And the effect of improving the processing performance was: potassium soap?magnesium soap?zinc soap.RPA2000 and DMA analysis showed that the loss factor of vulcanized SSBR/BR rubber at high temperature decreased with the addition of metallic soap,indicating that the effect of metallic soap on promoting the dispersion of silica was more obvious than the CB,and the rolling resistance of the SSBR/BR composites reduced.Finally,the effects of the content of silica and the magnesium soap on the properties of SSBR/BR were studied.The results showed that the viscosity,the hardness and 100% modulus of SSBR/BR composites increased with the increase of the content of silica.The tensile strength and tear strength basically remained unchanged,and decreased at high content of silica.While the wear resistance decreased with the increase of the content of silica,The dispersion of the silica deteriorated with the increased of its content.In addition,the magnesium soap made the specific heat capacity of the SSBR/BR composites filled with different content of silica,while the thermal diffusion coefficient,the thermal conductivity and the fatigue temperature increased.The error between the central temperature raise test value and the theoretical value was 10%,It showed that the flexible central temperature raise of SSBR/BR system can be predicted by the heat and thermal conductivity of the composites. |
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