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Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation
Polyurethane (PU) is an indispensable part of people’s lives. With the development of polyurethane, the disposal of polyurethane waste has become a significant issue around the world. Conventional degradation catalysts have poor dispersion and low degradation efficiency when used in the process of s...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9781215/ https://www.ncbi.nlm.nih.gov/pubmed/36559817 http://dx.doi.org/10.3390/polym14245450 |
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author | Gu, Xiaohua Wang, Xiaoyao Wang, Tong Zhu, Yanwei Guo, Xinyu Liu, Siwen Zhu, Shangwen Liu, Yan |
author_facet | Gu, Xiaohua Wang, Xiaoyao Wang, Tong Zhu, Yanwei Guo, Xinyu Liu, Siwen Zhu, Shangwen Liu, Yan |
author_sort | Gu, Xiaohua |
collection | PubMed |
description | Polyurethane (PU) is an indispensable part of people’s lives. With the development of polyurethane, the disposal of polyurethane waste has become a significant issue around the world. Conventional degradation catalysts have poor dispersion and low degradation efficiency when used in the process of solid degradation into liquid. Therefore, this paper innovatively adopts self-made core–shell nanoscale titanium catalysis, traditional alkali metal catalyst (KOH), and polyol to carry out the glycolysis of waste polyurethane (PU) pipeline foam. The homogenized nanoscale titanium catalyst coated with alcohol gel has an obvious core–shell structure. The alcohol gel not only protects the catalyst but also dissolves with the alcoholysis agent in the process of glycolysis and disperses more evenly into the alcoholysis agent to avoid the phenomenon of nanocatalyst agglomeration, so as to facilitate catalytic cracking without reducing catalyst activity. In this study, investigated and compared the production of renewable polyurethane foam via a one-step method based on use of a homogeneous core–shell nanostructured titanium catalyst vs. a traditional alkaline catalyst in terms of the properties of regenerated polyether polyols as well as of the foams produced from these polyols. The physicochemical properties of regenerated polyether polyols that were analyzed included viscosity, hydroxyl value, and average molecular weight. The regenerated polyurethane foams were characterized based on water absorption, TG, SEM, and thermal conductivity analyses. The results show that, when the addition of homogeneous titanium catalyst was T2 0.050 wt.%, the viscosity of regenerated polyether polyols was the lowest, at 5356.7 mPa·s, which was reduced by 9.97% compared with those obtained using the alkali metal catalyst (KOH). When the amount of titanium catalyst was T3 0.075 wt.%, the hard foam made of regenerated polyurethane prepared by the catalyst showed the best properties, with a compressive strength of 0.168 MPa, which is 4.76% higher than that of the foam prepared using KOH catalyst. |
format | Online Article Text |
id | pubmed-9781215 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-97812152022-12-24 Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation Gu, Xiaohua Wang, Xiaoyao Wang, Tong Zhu, Yanwei Guo, Xinyu Liu, Siwen Zhu, Shangwen Liu, Yan Polymers (Basel) Article Polyurethane (PU) is an indispensable part of people’s lives. With the development of polyurethane, the disposal of polyurethane waste has become a significant issue around the world. Conventional degradation catalysts have poor dispersion and low degradation efficiency when used in the process of solid degradation into liquid. Therefore, this paper innovatively adopts self-made core–shell nanoscale titanium catalysis, traditional alkali metal catalyst (KOH), and polyol to carry out the glycolysis of waste polyurethane (PU) pipeline foam. The homogenized nanoscale titanium catalyst coated with alcohol gel has an obvious core–shell structure. The alcohol gel not only protects the catalyst but also dissolves with the alcoholysis agent in the process of glycolysis and disperses more evenly into the alcoholysis agent to avoid the phenomenon of nanocatalyst agglomeration, so as to facilitate catalytic cracking without reducing catalyst activity. In this study, investigated and compared the production of renewable polyurethane foam via a one-step method based on use of a homogeneous core–shell nanostructured titanium catalyst vs. a traditional alkaline catalyst in terms of the properties of regenerated polyether polyols as well as of the foams produced from these polyols. The physicochemical properties of regenerated polyether polyols that were analyzed included viscosity, hydroxyl value, and average molecular weight. The regenerated polyurethane foams were characterized based on water absorption, TG, SEM, and thermal conductivity analyses. The results show that, when the addition of homogeneous titanium catalyst was T2 0.050 wt.%, the viscosity of regenerated polyether polyols was the lowest, at 5356.7 mPa·s, which was reduced by 9.97% compared with those obtained using the alkali metal catalyst (KOH). When the amount of titanium catalyst was T3 0.075 wt.%, the hard foam made of regenerated polyurethane prepared by the catalyst showed the best properties, with a compressive strength of 0.168 MPa, which is 4.76% higher than that of the foam prepared using KOH catalyst. MDPI 2022-12-13 /pmc/articles/PMC9781215/ /pubmed/36559817 http://dx.doi.org/10.3390/polym14245450 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Gu, Xiaohua Wang, Xiaoyao Wang, Tong Zhu, Yanwei Guo, Xinyu Liu, Siwen Zhu, Shangwen Liu, Yan Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation |
title | Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation |
title_full | Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation |
title_fullStr | Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation |
title_full_unstemmed | Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation |
title_short | Analysis of Factors Influencing the Efficiency of Catalysts Used in Waste PU Degradation |
title_sort | analysis of factors influencing the efficiency of catalysts used in waste pu degradation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9781215/ https://www.ncbi.nlm.nih.gov/pubmed/36559817 http://dx.doi.org/10.3390/polym14245450 |
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