characterized the influence of curing system on morphology and properties of rubber compounds containing GTR particles. Authors attained better mechanical properties for products obtained from compounds with conventional vulcanizing system. At this research two types of curing systems were used: conventional (CV) and effective (EV). investigated the effect of vulcanizing systems on mechanical properties of natural rubber (NR) vulcanizates containing 10–50 phr of reclaimed rubber. These conditions significantly affect the cross-link density of vulcanizates, which to a large degree controls their mechanical and thermal properties. One of the simplest and economically beneficial methods of the enhancement of rubber properties is proper selection of curing system and conditions of vulcanization. Ongoing research aims at optimization of rubber compounds containing GTR/reclaimed rubber with simultaneous maintenance of properties of resulting products. Ground tire rubber (GTR) and reclaimed rubber are commonly used in rubber industry as substitutes of fillers and elastomers in rubber compounds. Searching for new methods of used tires recycling is a widespread topic of research conducted by industries and scientific centers all over the world. These results showed that reclaimed rubber obtained via low temperature extrusion is suitable for application in rubber compounds. The best processing and mechanical properties were estimated for revulcanized reclaimed rubber cured with conventional vulcanizing system based on TBBS and CBS accelerators. The highest cross-link density showed samples cured with TMTD which corresponds to Δ M values, glass transition temperature and equilibrium swelling degree of these products. Presented results indicate that static and dynamic mechanical properties of revulcanized reclaimed rubber depend strongly on vulcanizing system type. Two ratios of vulcanization accelerator/sulfur were used. Reclaimed rubber was cured using different types of vulcanization accelerators (MBT, TBBS, TMTD, DPG, CBS) commonly used in industry.

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. Ground tire rubber was thermo-mechanical reclaimed at 120 ☌ using a co-rotating twin screw extruder.

Tire crumb