Reclaiming waste tire rubber by an irradiation technique

Molanorouzi, Mahdieh; Mohaved, Saeed Ostad

doi:10.1016/j.polymdegradstab.2016.03.009

Cited by 83 publications

(47 citation statements)

References 21 publications

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“…In general, gel content percentages decreased by 41% (from 85% to 44%) for TSE, and 50% (from 85% to 35%) for IM. The decrease on gel content percentage in this research was higher than reported results using two roll mill with additional reclaiming agent [24] and microwave techniques [16,21]. The better results achieved in this research might be due to generated shear from screw in TSE or rotor in IM.…”

Section: Effect Process On Gel Content Reductioncontrasting

confidence: 61%

See 1 more Smart Citation

A comparative study of ground tire rubber devulcanization using twin screw extruder and internal mixer

Ujianto¹,

Putri

Jayatin³

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Devulcanization of ground tire rubber (GTR) was done using twin screw extruder (TSE) and internal mixer (IM). Processing parameters were varied to analyze its effect on gel content. Fourier Transform Infrared Spectroscopy (FTIR) analysis was performed as qualitative technique to confirm structural change. The devulcanized rubbers with the least gel content percentage produced in both TSE and IM were then used as filler in natural rubber (NR)/coconut coir (CC) composite preparation. Effects of gel content percentage on NR/CC composite tensile strength and elongation at break were analyzed. The results show that the gel content decreased by 41% for sample processed in TSE and 50% in IM compared to control sample. Overall, the devulcanization is influenced by high energy generated by thermal or thermo-mechanical process. FTIR spectra show chemically structural changes of GTR as C=C, CH2, CH3with higher intensity for IM sample than its counterpart indicated devulcanization. The replacement of GTR to DGTR on NR/CC/GTR composites provided less network structures and resulted better tensile strength and elongation at break.

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Section: Effect Process On Gel Content Reductioncontrasting

confidence: 61%

“…Various methods have been proposed for reclaiming or devulcanizing waste tire, including thermomechanical using twin , and other methods using microwave [15][16][17][18], and supercritical CO2 [10,11,19]. From the available techniques, twin screw extruder is more attractive due to its ease and continuity.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of ground tire rubber devulcanization using twin screw extruder and internal mixer

Ujianto¹,

Putri

Jayatin³

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…These processes are rarely finding sufficient results to compete with the methods of re-use as co-processing, granulation and rolling, which in turn does not reutilize much of the energy potential in NR from tires 2,3 . Among the main devulcanization methods currently searched, highlights processing by ultrasound 4,5 , microwave 6,7 , chemical method 8 , biological treatment 9 and thermomechanical 10,11 . Currently, two relevant theories attempt to explain the mechanisms of crosslink selective breaking.…”

mentioning

confidence: 99%

Devulcanization of Natural Rubber in Composites with Distinct Crosslink Densities by Twin-Screw Extruder

2017

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In this study, the effects of the devulcanization process realized by an intermeshing co-rotating twin-screw extruder (ICTSE) on three vulcanized Natural Rubber (NR) composites with different crosslink densities (CD) have been investigated. The extrusion parameters were fixed, as well as the initial material granulometry and auxiliary thermoplastic added to the process. After composites vulcanization, they were characterized accordingly their soluble fraction (SF), crosslink density (CD), mechanical properties and thermogravimetry (TGA). The extrusion was performed on the vulcanized elastomers pursuing selectively crosslink rupture and the same characterization previously cited was conducted on the devulcanized material, except the mechanical properties analysis. The extrusion demonstrate effective devulcanization, evidenced in the increasing of soluble fractions, reduction in crosslink density and thermal stability gain. These results are directly affected by preliminary differences on materials structure and presence of ethylene vinyl-acetate (EVA) on extrusion.

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“…Rubber waste from tires and shoes are generally composed by a complex mixture of SBR, fillers, processing additives, curing agents, pigments, and stabilizers . Therefore, the possibility of reusing rubber waste is a justification for searching the best combination of factors that improves the properties.…”

Section: Introductionmentioning

confidence: 99%

“…[27,28] Rubber waste from tires and shoes are generally composed by a complex mixture of SBR, fillers, processing additives, curing agents, pigments, and stabilizers. [29][30][31][32] Therefore, the possibility of reusing rubber waste is a justification for searching the best combination of factors that improves the properties. Thus, some recent studies were reported in the literature about the development of polymer blends based on rubber waste and polystyrene.…”

Section: Introductionmentioning

confidence: 99%

Blends of Polystyrene/Shoes Waste (SBRr): Influence of Mixture Sequence and Compatibilizer

Luna

Silva

Araújo

et al. 2019

Macromolecular Symposia

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The aim of this research is to analyze the influence of the mixture sequence and compatibilizer on the morphology and mechanical and thermomechanical properties of polystyrene (PS)/shoes waste (SBRr) blends. The blends are processed in a twin screw co‐rotating extruder and then injection molded. They are analyzed by impact and tensile tests, Shore D hardness, heat deflection temperature (HDT), ductile‐brittle transition temperature and transmission electron microscopy (TEM). The results showed that there is a significant increase in the impact strength, in the hardness and in the HDT of the blends when PS and styrene–butadiene–styrene (SBS) were mixed together in a first extrusion, prior to the incorporation of the SBRr into a second extrusion. However, the different mixing sequences studied apparently did not influence the results of tensile strength. The morphology showed by the mixing sequence (PS/SBS) + SBRr evidenced a better dispersion of the SBRr in the PS matrix, favoring better properties.

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Reclaiming waste tire rubber by an irradiation technique

Cited by 83 publications

References 21 publications

A comparative study of ground tire rubber devulcanization using twin screw extruder and internal mixer

A comparative study of ground tire rubber devulcanization using twin screw extruder and internal mixer

Devulcanization of Natural Rubber in Composites with Distinct Crosslink Densities by Twin-Screw Extruder

Blends of Polystyrene/Shoes Waste (SBRr): Influence of Mixture Sequence and Compatibilizer

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