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

Ujianto, Onny; Putri, D B; Jayatin,; AWinarto, D

doi:10.1088/1757-899x/223/1/012005

Cited by 7 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They obtained a gel content of approximately 75% in the most aggressive condition. On the other hand, Ujianto et al [6], using twin screw extruders, reached gel values of approximately 50%, from samples with 85% gel content at 300°C and 100 rpm. Taking as a basis that the speed used in the extrusion is 100 rpm, and resulted in a rate of the same magnitude as that in the thermokinetic mixer, the speeds are about 50 times more significant, but the temperature reached in the times studied is much lower than at 300°C, the shear rate is believed to play an essential role in reducing the gel content as it results in greater chain scissions.…”

Section: Resultsmentioning

confidence: 93%

“…Ujianto and coworkers compared elastomer devulcanization using single and twin screw extruders. They reported that the twin screw extruder operating at 300°C and 100 rpm reduced the gel content by 50% for an elastomer with an initial gel content of 85%, while for the single screw, the reduction was 40% [6]. Diaz et al performed thermomechanical devulcanization of waste tires and compared two mixers, one with high shear and the other with pressure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanochemical Treatment in High-Shear Thermokinetic Mixer an Alternative for Tire Recycling

Bianchi¹,

Pereira²,

Ferreira³

2022

Preprint

View full text Add to dashboard Cite

This publication highlights the effect of mechanochemical treatment in a high-speed thermoki-netic mixer as an alternative for recycling ground tire rubber (GTR). The GTR initially has an 80% gelled fraction and presented up to 50% gel fraction in the most intensive condition (5145 rpm, s2). Processing at the lowest speed (2564 rpm, s1) resulted in greater selectivity concerning the mechanochemical treatment (K~1). In the most intense processing condition (10 min. at s2), more significant degradation was observed via random scission with a reduction of the glass transition temperature, Tg (11ºC), an increase of the soluble polymer fraction, and a more signif-icant reduction in crosslink density. The artificial neural network could describe and correlate the thermal degradation profile and processing conditions with the physicochemical characteris-tics of the GTR. The approach presented here represents an alternative for mechanochemical treatment since it can reduce the crosslink density with selectivity and in short times (1-3 min.).

show abstract

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Mechanochemical Treatment in High-Shear Thermokinetic Mixer an Alternative for Tire Recycling

Bianchi¹,

Pereira²,

Ferreira³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Ujianto et al [ 9 ], using twin-screw extruders, reached gel values of approximately 50%, from samples with 85% gel content at 300 °C and 100 rpm. Considering that the speed used in extrusion is 100 rpm and that in the thermokinetic mixer, the degree of devulcanization is similar.…”

Section: Resultsmentioning

confidence: 99%

“…Ujianto and coworkers compared elastomer devulcanization using single- and twin-screw extruders. They reported that the twin-screw extruder operating at 300 °C and 100 rpm reduced the gel content by 50% for an elastomer with an initial gel content of 85%, while for the single-screw, the reduction was 40% [ 9 ]. Diaz et al performed thermomechanical devulcanization of waste tires and compared two mixers, one with high shear and the other with pressure.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Treatment in High-Shear Thermokinetic Mixer as an Alternative for Tire Recycling

2022

View full text Add to dashboard Cite

This publication highlights the use of a high-speed thermokinetic mixer as an alternative to recycling ground tire rubber (GTR) using mechanochemical treatment. The GTR initially had a gelled fraction of 80% and presented a reduction of up to 50% of gel fraction in the most intensive condition (5145 rpm, n2). The processing condition at the lowest speed (2564 rpm, n1) resulted in greater selectivity in chain scission (K~1). However, in the most intense processing condition (10 min to n2), more significant degradation was observed via random scission, reduction in the glass transition temperature, Tg (11 °C), increase in the soluble polymeric fraction, and a more significant reduction in the density of bonds occurs. The artificial neural network could describe and correlate the thermal degradation profile with the processing conditions and the physicochemical characteristics of the GTR. The n2 velocity resulted in the formation of particles with a smoother and more continuous surface, which is related to the increase in the amount of soluble phase. The approach presented here represents an alternative to the mechanochemical treatment since it can reduce the crosslink density with selectivity and in short times (1–3 min).

show abstract

“…Ujianto et al [23] 2017 It focuses on FT-IR of NR Qualitative analysis, aiming at the evaluation of spectrometric changes, resulting from devulcanization. Datta et al [24] 2017 Determination of NR, SBR and BR contents in ternary mixture by FT-IR and TGA.…”

Section: Authormentioning

confidence: 99%

Quantification by FT-IR (UATR/NIRA) of NBR/SBR blends

et al. 2018

View full text Add to dashboard Cite

ObstractRubber blends are important materials in automotive industry, as well as in other sectors. However, there are implications when suitable use of a polymer in an artifact is not made. In the automotive area, for example, the use of an elastomer without the fuel resistance requirement would result in component degradation, potential fuel leakage, and danger of fire. The use of polymer blends may be the solution to this problem. Fourier transform infrared spectroscopy (FT-IR) can be used for the knowledge of the polymer content of these blends. Then, FT-IR quantitative methodologies for determining acrylonitrile-butadiene copolymer (NBR) copolymer and butadiene-styrene copolymer (SBR) contents were developed by the transflectance accessory, NIRA, and the transmission mode, being the sample analyzed by transmission and universal attenuated total reflection (UATR) in the medium infrared (MIR). UATR and NIRA methodologies showed better accuracy. However, the MIR analysis showed a detection limit between 10-20% of NBR.

show abstract

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

Cited by 7 publications

References 29 publications

Mechanochemical Treatment in High-Shear Thermokinetic Mixer an Alternative for Tire Recycling

Mechanochemical Treatment in High-Shear Thermokinetic Mixer an Alternative for Tire Recycling

Mechanochemical Treatment in High-Shear Thermokinetic Mixer as an Alternative for Tire Recycling

Quantification by FT-IR (UATR/NIRA) of NBR/SBR blends

Contact Info

Product

Resources

About