Pyrolysed Carbon-Silica Filler Obtained by Pyrolysis-Cum-Water Vapour of Waste Green Tires vs. Conventional Fillers. Comparison of Their Effects Upon the Properties of Epoxidized Natural Rubber Based Vulcanizates

Omar Al-Hartomy(1), Ahmed Al-Ghamdi(2), Said Al Said(3), Nikolay Dishovsky(4*), Mihail Mihaylov(5), Milcho Ivanov(6), Petar Kolev(7), Ljutzkan Ljutzkanov(8)

(1) Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia, Saudi Arabia
(2) Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia, Saudi Arabia
(3) Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia, Saudi Arabia
(4) Department of Polymer Engineering, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski blvd., 1756 Sofia, Bulgaria, Bulgaria
(5) 3Department of Polymer Engineering, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski blvd., 1756 Sofia, Bulgaria, Bulgaria
(6) Department of Polymer Engineering, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski blvd., 1756 Sofia, Bulgaria, Bulgaria
(7) Department of Polymer Engineering, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski blvd., 1756 Sofia, Bulgaria, Bulgaria
(8) Institute of Chemical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria, Bulgaria
(*) Corresponding author


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Abstract


Pyrolysed carbon-silica filler (PCSF) has been obtained via pyrolysis cum water vapour of waste “green” tire treads. Weight analyses as well as AAS and ICP-OES analyses show that PCSF consists of 60% of silica, 36% of carbon black, 2.5% of zinc oxide and of about 1.5% of different oxides. As FTIR spectra and TEM micrographs show, the selected pyrolysis conditions allow silica and carbon black used as fillers in tires manufacturing to preserve their particle size and surface chemical activity in the pyrolysed product. The vulcanization characteristics, mechanical and dynamic properties of composites based on epoxidized natural rubber reinforced with the pyrolysed carbon-silica filler (PCSF) have been studied in comparison to those of analogous composites comprising conventional fillers. It has been established that the vulcanization characteristics, mechanical and dynamic properties of the studied rubber compounds and vulcanizates filled with PCSF are commensurable, even in some cases improved, in comparison to those of the composites comprising the conventional fillers.
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Keywords


Waste Green Tires; Pyrolysis; Silica; Rubber Composites; Mechanical Properties

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References


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