| With the development of economy and social society, the amount of car ownership has increased year by year, and the output of waste tires also increased every year. Pyrolysis is recognized as an effective treatment of scrap tires, the scrap tires will be crack into oil, pyrolysis gas and pyrolysis carbon black in the absence of oxygen or nitrogen atmosphere. As one of the products of waste tire pyrolysis, the proper utilize of pyrolysis carbon black can not only improve the profits of scrap tire pyrolysis industry, but also reduce the cost of certain rubber products greatly. This paper has mainly studied the basic properties of pyrolysis carbon black and modified the CBp because of the high ash and oil content of CBp. Through this work, the author are mean to characterise the basic properties of pyrolysis carbon black, improve its’ quality, broaden the application fields and improve the application value of it.In this paper, the pyrolysis carbon black was characterized in detail, the structure parameters of commercial carbon black N550 were compared, also the CBp and N550 were used in SBR and the influence of the two on the performance of SBR was investigated. The experimental results showed that the ash content of pyrolysis carbon black was high, the structure of CBp was lower than N550, the specific surface area of N550 and CBp were similar. With the increasement of CBp shares, the shear viscosity of SBR compounds filled by CBp/N550 decreased and the appearance of SBR extrudates became rough, the tensile strength, modulus, tear strength, hardness and abrasion decreased, while the resilience increased, the tanδ value near 0℃ of SBR vulcanizates reduced gradually.This paper also studied the processing characteristics and reinforcing effect of SBR filled by CBp produced by different process. Through analysis and comparison of different CBps, we found that the ash content, surface oil content and BET surface area of CBps were different, due to the different cracking process and tire source. The BET surface area of CBp which has high surface oil content improved greatly after toluene Soxhlet extractor de-oiled treatment. The shear viscosity of SBR compounds filled by large BET surface area CBp was larger, the vulcanizates, modulus, tear strength and hardness was also higher, and the abrasion performance was better. The SEM photos of SBR vulcanizates fracture surface showed that the surface oil content was higher, the disperse state of CBp was better in the rubber.In order to improve the reinforcement effect of pyrolysis carbon black to rubber, we treated CBp with three different kinds of inorganic acids due to the high ash content of CBp. The basic properties of CBp before and after acid treated were characterized and also the properties of NR/BR filled by these CBps were studied. The results showed that, the ash removal effect of nitric acid to CBp was the best among the three kinds of acids. The extrusion behaviors, reinforcement effect and abrasion resistance were better when NR/BR filled by hydrochloric acid treated CBp. The tanδ values near 0℃ of NR/BR vulcanizates were almost the same, while the tanδ value near 60-80℃ of NR/BR vulcanizate filled by hydrochloric acid treated CBp was smaller than others.The surface oil content of CBp is high, so we treated high oil content CBp which produced by a Suzhou producer with acetone and toluene, respectively. The results showed that, the oil removal effect of Toluene Soxhlet extraction process was better than acetone. The increase amplitude of BET surface area of toluene treated WCBp was higher than toluene treated CBp, which indicated that ash and oil were both reasons why CBp has a small BET surface area. Once CBp being oil removed, the outline of the CBp particle was clear; the particles were almost spherical, the content of mesopores and micropores increased. The shear viscosity of SBR became large after CBp de-oiled treated, while the oil seemed to have no influence on its extrudate appearance. After being de-oiled treated, CBp filled SBR vulcanizate had a higher tensile strength, modulus, while the elongation at break reduced significantly. And the hardness and rebound increased slightly. |
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