Microwave devulcanized crumb rubbers in polypropylene based thermoplastic dynamic vulcanizates

Dániel Ábel Simon, István Zoltán Halász, József Karger-Kocsis, Tamás Bárány

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Because of the chemically crosslinked 3D molecular structure of rubbers, their recycling is a challenging task, especially when cost efficiency is also considered. One of the most straightforward procedures is the grinding of discarded rubber products with subsequent devulcanization. The devulcanized rubber can be used as a feedstock for fresh rubber compounds or can be blended with uncured virgin rubber and thermoplastic polymers to form thermoplastic dynamic vulcanizates (TDVs). TDVs combine the beneficial (re)processability of thermoplastics and the elastic properties of rubbers. Our current work focuses on the development of polypropylene (PP)-based TDVs with the use of a tire model rubber (MR) composed of natural rubber (NR) and styrene-butadiene rubber (SBR) in a ratio of 70/30. The research target was the partial substitution of the above fresh MR by microwave devulcanized crumb rubber (dCR). TDVs were produced by continuous extrusion, and the effects of composition (PP/MR/dCR = 40/60/0.. 50/35/15) and processing parameters (different screw configurations, temperature profiles, the feeding method of PP) were investigated. Results showed that the fresh rubber compound can be replaced up to 10 wt % without compromising the mechanical properties of the resulting TDV.

Original languageEnglish
Article number767
JournalPolymers
Volume10
Issue number7
DOIs
Publication statusPublished - Jul 12 2018

Keywords

  • Crumb rubber
  • Ground tire rubber
  • Microwave devulcanization
  • Rubber recycling
  • Thermoplastic dynamic vulcanizate

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics

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