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Polymers
Volume 14
Issue 5
10.3390/polym14051057
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Article

Selective Decomposition of Waste Rubber from the Shoe Industry by the Combination of Thermal Process and Mechanical Grinding

by
Qiao Xiao
1,2,
Changlin Cao
2,3,4,*,
Liren Xiao
1,2,*,
Longshan Bai
1,2,
Huibin Cheng
2,3,4,
Dandan Lei
1,2,
Xiaoli Sun
2,3,4,
Lingxing Zeng
2,3,4,
Baoquan Huang
2,3,4,
Qingrong Qian
2,3,4 and
Qinghua Chen
2
1
College of Chemistry and Materials, Fujian Normal University, Fuzhou 350007, China
2
Engineering Research Center of Polymer Green Recycling of Ministry of Education, Fujian Normal University, Fuzhou 350007, China
3
College of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, China
4
Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fuzhou 350007, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Luis Alves
Polymers 2022, 14(5), 1057; https://doi.org/10.3390/polym14051057
Received: 28 December 2021 / Revised: 28 February 2022 / Accepted: 2 March 2022 / Published: 7 March 2022
(This article belongs to the Section Polymer Analysis and Characterization)
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Abstract

A major challenge in waste rubber (WR) industry is achieving a high sol fraction and high molecular weight of recycled rubber at the same time. Herein, the WR from the shoe industry was thermo-mechanically ground via the torque rheometer. The effect of grinding temperature and filling rate were systematically investigated. The particle size distribution, structure evolution, and morphology of the recycled rubber were explored by laser particle size analyzer, Fourier transform infrared spectroscopy (FTIR), sol fraction analysis, gel permeation chromatography (GPC), differential scanning calorimeter (DSC), and scanning electron microscope (SEM). The results indicate that the thermo-mechanical method could reduce the particle size of WR. Moreover, the particle size distribution of WR after being ground can be described by Rosin’s equation. The oxidation reaction occurs during thermal-mechanical grinding. With the increase of the grinding temperature and filling rate, the sol fraction of the recycled WR increases. It is also found that a high sol fraction (43.7%) and high molecular weight (35,284 g/mol) of reclaimed rubber could be achieved at 80 °C with a filling rate of 85%. Moreover, the obtained recycled rubber compound with SBR show a similar vulcanization characteristics to pure SBR. Our selective decomposition of waste rubber strategy opens up a new way for upgrading WR in shoe industry. View Full-Text
Keywords: waste rubber; thermo-mechanical grinding; filling rates; grinding temperature waste rubber; thermo-mechanical grinding; filling rates; grinding temperature
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Xiao, Q.; Cao, C.; Xiao, L.; Bai, L.; Cheng, H.; Lei, D.; Sun, X.; Zeng, L.; Huang, B.; Qian, Q.; Chen, Q. Selective Decomposition of Waste Rubber from the Shoe Industry by the Combination of Thermal Process and Mechanical Grinding. Polymers 2022, 14, 1057. https://doi.org/10.3390/polym14051057

AMA Style

Xiao Q, Cao C, Xiao L, Bai L, Cheng H, Lei D, Sun X, Zeng L, Huang B, Qian Q, Chen Q. Selective Decomposition of Waste Rubber from the Shoe Industry by the Combination of Thermal Process and Mechanical Grinding. Polymers. 2022; 14(5):1057. https://doi.org/10.3390/polym14051057

Chicago/Turabian Style

Xiao, Qiao, Changlin Cao, Liren Xiao, Longshan Bai, Huibin Cheng, Dandan Lei, Xiaoli Sun, Lingxing Zeng, Baoquan Huang, Qingrong Qian, and Qinghua Chen. 2022. "Selective Decomposition of Waste Rubber from the Shoe Industry by the Combination of Thermal Process and Mechanical Grinding" Polymers 14, no. 5: 1057. https://doi.org/10.3390/polym14051057

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