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Continuous Ultrasonic Devulcanizatiion of Used Tire Rubbers Suitable for Incorporation in New Tires

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, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
The ultrasonic devulcanization of ground tire rubber (GTR) of 40 meshes using an ultrasonic twin-screw extruder was studied. The die pressure and ultrasonic power consumption were recorded during the process of devulcanization. Devulcanization was carried out at a frequency of 40 kHz and ultrasonic amplitudes at 0 µm and 8 µm. The gel fraction, crosslink density, and revulcanization behavior were studied to investigate the degree of devulcanization. After devulcanization, untreated ground tire rubber (UTR) powder, ground tire rubbers devulcanized at 0 µm (DTR 0 µm) and 8 µm (DTR 8 µm) were blended with natural rubber (NR) at ratios of 100/0, 50/50, 35/65, 20/80, 10/90, and 0/100. In order to reinforce these blends, carbon black (CB) was added to GTR/NR to the CB content in NR equals to GTR. Rheological properties, curing behavior, mechanical properties and abrasion loss of revulcanized rubbers were measured. Revulcanized tire rubber at 8 µm with natural rubber (RTR 8 µm/NR) had better mechanical properties and lower abrasion loss than revulcanized tire rubber at 0 µm with natural rubber (RTR 0 µm/NR) at all blending ratios. Lower gel fraction of DTR 0 µm and DTR 8 µm compared with UTR indicated devulcanization of GTR at 0 µm and 8 µm. RTR 0 µm/NR and RTR 8 µm/NR vulcanizates exhibited higher tensile strength and elongation at break than those vulcanizates presence from mixture of UTR and NR (RUTR/NR), but lower modulus at 100% elongation and lower abrasion loss. The addition of CB to blends improved modulus at 100% elongation, tensile strength and abrasion properties significantly, but decreased elongation at break compared with blends without CB. The differences in rheological and mechanical properties of RUTR/NR/CB, RTR 0 µm/NR/CB and RTR 8 µm/NR/CB blends decreased compared to those of RUTR/NR, RTR 0 µm/NR and RTR 8 µm/NR blends.
Avraam Isayev (Advisor)

Recommended Citations

Citations

  • Guo, Y. (n.d.). Continuous Ultrasonic Devulcanizatiion of Used Tire Rubbers Suitable for Incorporation in New Tires [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462533895

    APA Style (7th edition)

  • Guo, Yingmin. Continuous Ultrasonic Devulcanizatiion of Used Tire Rubbers Suitable for Incorporation in New Tires. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1462533895.

    MLA Style (8th edition)

  • Guo, Yingmin. "Continuous Ultrasonic Devulcanizatiion of Used Tire Rubbers Suitable for Incorporation in New Tires." Master's thesis, University of Akron. Accessed MARCH 28, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462533895

    Chicago Manual of Style (17th edition)