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Devulcanized EPDM without paraffinic oil in the production of blends as a potential application of the residues from automobile industry

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Abstract

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.

Highlights

  • 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.

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Acknowledgements

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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Authors and Affiliations

  1. Technology Development Center, Universidade Federal de Pelotas (UFPel), Rua Gomes Carneiro, 1, Pelotas, RS, 96010-610, Brazil

    Fabiula D. B. de Sousa

  2. Center of Engineering, Modeling and Applied Social Science, Universidade Federal do ABC (UFABC), Avenida dos Estados, 5001, Santo André, SP, 09210-580, Brazil

    Fabiula D. B. de Sousa

  3. Polytechnic School of Civil Engineering, IMED, Rua Senador Pinheiro 304, Passo Fundo, RS, CEP 99070-220, Brazil

    Aline Zanchet

  4. Physical Metallurgy Laboratory, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500, Porto Alegre, RS, 91509-900, Brazil

    Elaine S. Marczynski

  5. Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Caxias Do Sul, RS, 95070-560, Brazil

    Vinicius Pistor & Janaina S. Crespo

  6. Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul (IFRS), Campus Caxias do Sul, Rua Avelino Antônio de Souza, 1730, Caxias Do Sul, RS, 95043-700, Brazil

    Rudinei Fiorio

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  1. Fabiula D. B. de Sousa
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  2. Aline Zanchet
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  3. Elaine S. Marczynski
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  4. Vinicius Pistor
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Correspondence to Fabiula D. B. de Sousa.

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de Sousa, F.D.B., Zanchet, A., Marczynski, E.S. et al. Devulcanized EPDM without paraffinic oil in the production of blends as a potential application of the residues from automobile industry. J Mater Cycles Waste Manag 22, 273–284 (2020). https://doi.org/10.1007/s10163-019-00938-x

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