Glycolysis of flexible polyurethane foam in recycling of car seats

Beneš, Hynek; Rosner, J.; Holler, Petr; Synková, Hana; Kotek, Jiřı́; Horák, Zdeněk

doi:10.1002/pat.810

Cited by 45 publications

(35 citation statements)

References 9 publications

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“…Current methods for chemical degrading polyurethane into low molecular weight compounds include glycolysis [3][4][5][6][7][8][9][10][11][12], hydrolysis [13][14][15], aminolysis [16,17] and other chemical processes [18][19][20][21][22]. Among these chemical-recycling processes, glycolysis is much favored and has been paid more attention due to its mild reaction conditions and highly reproducible properties of the recycled products.…”

Section: Introductionmentioning

confidence: 99%

Chemical degradation of thermoplastic polyurethane for recycling polyether polyol

Wang

Chen

Chen³

et al. 2011

Fibers Polym

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Thermoplastic polyurethane, based on 4,4'-diphenylmethane diisocyanate and polyether polyol, was degraded by glycol and ethanolamine at 170 o C. Optimum conditions for the glycolysis of thermoplastic polyurethane were investigated by adjusting the ratio of polymer to degradation reagent, glycol to ethanolamine as well as the reaction temperature. The degradation reaction was conducted under nitrogen atmosphere and accelerated by catalysts such as lithium acetate, which was evidenced by lowering the degradation temperature as well as the amounts of degradation reagent. The decomposition products were completely separated into two layers. The upper liquid layer was a polyether polyol, which was characterized by gel permeation chromatography (GPC), nuclear magnetic resonance (NMR), infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The present glycolysis procedure allows a simple recycling of the hydroxyl terminated polyol in pure form.

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Section: Introductionmentioning

confidence: 99%

Chemical degradation of thermoplastic polyurethane for recycling polyether polyol

Wang

Chen

Chen³

et al. 2011

Fibers Polym

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“…Research on polyurethane (PU) glycolysis has been conducted worldwide with a stable intensity for many years [1][2][3][4][5][6][7][8][9]. Studies are aimed at elaborating technologies which would allow the production of semi-products useful for industry and therefore possessing certain functionality, molecular mass, medium reactivity, and low viscosity at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of glycols used as glycolysis agents on chemical structure and thermal stability of the produced glycolysates

Datta

2012

J Therm Anal Calorim

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In this study, the influence of glycols on chemical structure and thermal stability of glycolysates as polyurethane intermediates were investigated. The intermediates were obtained by the glycolysis process of waste polyurethane foams in the reaction with different glycols ranging from ethylene glycol to hexane-1,6-diol. The used glycols were not separated from the product after the glycolysis process has been terminated. The effects of different weight ratio of glycols to polyurethane (PU) foam on chemical structure and thermal stability were investigated by FTIR, GPC, and TG/DTG. FTIR analysis of the glycolysates revealed their similar chemical architecture as manifested by the similarity of absorption peaks within the entire wavenumber range of spectra. This may indicate that the glycol has no influence on the chemical composition of glycolysates. GPC analysis showed that the glycolysates were characterized by polydispersity smaller than 2 which is lower as compared to some commercial polyols used for PU synthesis. GPC chromatograms showed that the applied glycols and the conditions of PU glycolysis allowed recreation of the original polyol as documented on the chromatograms by a single, well-formed peak at the beginning of retention time. Based on TG thermograms, it was established that glycol used in transesterification of PUs affected the temperature at which the loss of glycolysate mass by 5 and 10 % occurs. It was also observed that glycol affected the temperature at which the decomposition rate of glycolysates was the highest.

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“…HTMA suppresses the formation of solid phases in the products at a diaminotoluene (DAT) content below 100 ppm [98]. A research team in Taiwan has optimized the process conditions for glycolysis of PU from waste refrigerators/freezers, as to produce high-quality polyol recyclate [99][100][101][102]. In a stirred tank reactor at approx.…”

Section: Glycolysismentioning

confidence: 99%

Polyurethane Waste Reduction and Recycling: From Bench to Pilot Scales

Nikje

Garmarudi

Idris

2011

Designed Monomers and Polymers

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In this review, reports, patents and recently published papers and documents on polyurethane recycling, especially chemical recycling methods, are investigated in order to find an adequate method for waste reduction, protecting the environment and preventing waste land filling. The recycling of polyurethane has always posed unique challenges due to its wide variety of applications, from the industry to bio-based materials, namely, artificial organs. Mechanical regrinding is the oldest method in polyurethane waste recycling and the use of the regrind wastes as filler in the new formulations. Chemical recycling of polyurethanes by hydrolysis, aminolysis and glycolysis is for the most part considered economically uncompetitive compared to formulating with virgin raw materials. Also some thermochemical processes are utilized for PU recycling. Recycling has opened an effective and economic route for polyurethane waste treatment. Nonetheless, more research efforts are required in order to scale up the recycling methods.

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Glycolysis of flexible polyurethane foam in recycling of car seats

Cited by 45 publications

References 9 publications

Chemical degradation of thermoplastic polyurethane for recycling polyether polyol

Chemical degradation of thermoplastic polyurethane for recycling polyether polyol

Effect of glycols used as glycolysis agents on chemical structure and thermal stability of the produced glycolysates

Polyurethane Waste Reduction and Recycling: From Bench to Pilot Scales

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