Abstract
Ground tire rubber was thermo-mechanical reclaimed at 120 °C using a co-rotating twin screw extruder. The effect of vulcanizing system type on curing characteristics, static mechanical properties (tensile strength, elongation-at-break, hardness and resilience), dynamic mechanical properties and thermal properties of reclaimed ground tire rubber was investigated. Reclaimed rubber was cured using different types of vulcanization accelerators (MBT, TBBS, TMTD, DPG, CBS) commonly used in industry. Two ratios of vulcanization accelerator/sulfur [2:1 as conventional system and 1:2 as effective system (EV)] were used. Presented results indicate that static and dynamic mechanical properties of revulcanized reclaimed rubber depend strongly on vulcanizing system type. The highest cross-link density showed samples cured with TMTD which corresponds to ΔM values, glass transition temperature and equilibrium swelling degree of these products. The best processing and mechanical properties were estimated for revulcanized reclaimed rubber cured with conventional vulcanizing system based on TBBS and CBS accelerators. These results showed that reclaimed rubber obtained via low temperature extrusion is suitable for application in rubber compounds.
Highlights
Searching for new methods of used tires recycling is a widespread topic of research conducted by industries and scientific centers all over the world [1,2,3]
Thermogravimetric curve profiles for reclaimed rubber cured with TBBS, TMTD or MTB accelerators, discussed in terms of cross-linking degree were correlated with the characteristics of vulcanization process (ΔM values), values of swelling degree and results of static and dynamic mechanical analysis
The results from this work suggested that vulcanizing system type have significant influence on curing kinetics of reclaimed rubber
Summary
Searching for new methods of used tires recycling is a widespread topic of research conducted by industries and scientific centers all over the world [1,2,3]. Presented results confirmed the significant influence of vulcanizing system (especially type of vulcanization accelerator) on curing characteristics, mechanical and thermal properties of the obtained vulcanizates.
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