Devulcanized EPDM without paraffinic oil in the production of blends as a potential application of the residues from automobile industry
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Vulcanized residues of ethylene–propylene–diene monomer rubber (EPDM) from expanded profiles trims, called EPDM-r, were treated to remove the paraffinic oil and then devulcanized by microwaves at different exposure times (0, 2, 3 and 4 min). Elastomeric formulations of EPDM-r compound/raw EPDM compound containing 67 wt% of recycled phase were produced, and the characteristics of the vulcanization process, mechanical and dynamic-mechanical properties, morphology and accelerated aging of the blends were analyzed. The promising results showed that it is possible to obtain new rubber compositions containing 67 wt% of EPDM-r with similar—or even higher—mechanical properties than the Reference sample (without EPDM-r), pointing out to the potential use of devulcanized EPDM-r in several applications, as a possible solution to the destination of these materials, aiming at the sustainable development.
Production of elastomeric blends containing a high concentration of ethylene–propylene–diene monomer rubber (EPDM), i.e. 67 wt%.
Devulcanization of the EPDM residue by microwaves irradiation.
Increasing the microwave exposure time improved the efficiency of the devulcanization process.
Extraction of the paraffinic oil from the EPDM residue (before devulcanization) improved the efficiency of the devulcanization process.
The final material has a potential application of the residues from the automobile industry itself, such as in the manufacture of new products.
KeywordsEPDM Paraffinic oil Recycling Devulcanization Microwaves
The authors would like to thank Ciaflex Rubber Industry Ltd. (Caxias do Sul, Rio Grande do Sul, Brazil) for supplying the expanded profiles trims and rubber recipes.
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