Pulverization of end-of-life tires by ultra-high pressure water jet process
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Zefeng Wang
und
Zhao Wang
Abstract
Crumb rubber (CR), as a final product from end-of-life tires through size reduction process, has proved an appropriate end product for accumulated discard waste tires all around the world. Unlike pre-existing pulverization methods, such as ambient or cryogenic grinding and solid-state shear extrusion, an entire cool pulverization process utilizing ultra-high pressure water jet (UHPWJ) was proposed in this paper. Pulverization experiments under various processing parameters were designed and conducted. The particle size distributions of produced CR were obtained using laser particle analyzer. Microscopic morphologies of CR and rubber fracture surface were observed under scanning electron microscopy. The crosslink density and gel fraction of produced CR were experimentally determined. Influence of four main processing parameters as pump pressure, transverse velocity, standoff distance and impacting angle was discussed in detail, and the most suitable processing parameters were recommended. The results show that the particle size distribution of produced CR with UHPWJ is between 45 μm and 200 μm, and the surface of CR is coarse and porous. High compressive shear effect and erosion are the main mechanisms in UHPWJ pulverization. Besides, the produced CR has already been partly devulcanized after UHPWJ pulverization, and polymer degradation occurred in the meanwhile.
Acknowledgments
The authors would like to thank the National Key Basic Research Program of China (973 Program) under Program no. 2014CB239203 and National Science Foundation of China (NSFC) under Program no. 51474158 for the financial support of this work.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Original articles
- Pulverization of end-of-life tires by ultra-high pressure water jet process
- Tribological behavior and morphology of PTFE particulate-reinforced POM matrix composites
- Effect of the matrix plasticization behavior on mechanical properties of PVC/ABS blends
- Bulk cure study of nanoclay filled epoxy glass fiber reinforced composite material
- Improvement of interlaminar shear strength of 2.5D fabric laminated composites with short-cut web interlayer
- Optimizing of vented injection molding on mechanical performance and miscibility of recycled poly(ethylene terephthalate) and polycarbonate blends
- Comparison of material properties in butt welds of used and unused polyethylene pipes for natural gas distribution
- Enhancing the potential of employing thermosetting powder recyclates as filler in LLDPE by structural modifications
- Micro-roughening of polyamide fabric using protease enzyme for improving adhesion strength of rubber-polyamide composite
- The real time optical transmittance of swollen heterogeneous natural rubber/poly (ethylene-co-vinyl acetate) blends
- Preparation and characterization of anti-fouling PVDF membrane modified by chitin
Artikel in diesem Heft
- Frontmatter
- Original articles
- Pulverization of end-of-life tires by ultra-high pressure water jet process
- Tribological behavior and morphology of PTFE particulate-reinforced POM matrix composites
- Effect of the matrix plasticization behavior on mechanical properties of PVC/ABS blends
- Bulk cure study of nanoclay filled epoxy glass fiber reinforced composite material
- Improvement of interlaminar shear strength of 2.5D fabric laminated composites with short-cut web interlayer
- Optimizing of vented injection molding on mechanical performance and miscibility of recycled poly(ethylene terephthalate) and polycarbonate blends
- Comparison of material properties in butt welds of used and unused polyethylene pipes for natural gas distribution
- Enhancing the potential of employing thermosetting powder recyclates as filler in LLDPE by structural modifications
- Micro-roughening of polyamide fabric using protease enzyme for improving adhesion strength of rubber-polyamide composite
- The real time optical transmittance of swollen heterogeneous natural rubber/poly (ethylene-co-vinyl acetate) blends
- Preparation and characterization of anti-fouling PVDF membrane modified by chitin
