Recovery of Polyol from Flexible Polyurethane Foam Wastes

Buggy, M.; O'Driscoll, Breda

doi:10.4028/www.scientific.net/kem.99-100.65

Cited by 5 publications

(1 citation statement)

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“…Recently, H. Bhatti et al (3) published an excellent review devoted to the methods for polyurethane recycling and recovery. The most important methods of chemical recycling of PURs are hydrolysis (4), glycolysis (5-7), hydroglycolysis (8), aminoalcoholysis (9,10), and methanolysis (11). Glycolysis of PU gives a mixture of original polyol, low-molecular-weight urethanes with hydroxy-end groups and secondary products such as aromatic amines (5,6,12).…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of the Chemical Degradation of Flexible Polyurethane Foam Wastes with Dimethyl H-phosphonate with Different Catalysts

Molero

Mitova

Troev

et al. 2010

Journal of Macromolecular Science, Part A

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Flexible polyurethane foams (PU) based on toluene diisocyanate and polyether polyol have been degraded by dimethyl H-phosphonate (DMP) in the presence of catalysts such as potassium tert-butoxide, potassium and azobisisobutyronitrile (AIBN). The structure and molecular weight of the degraded products were monitored by 31 P-NMR and GPC. The degradation process was controlled by the polydispersity (PD) of the reaction product. Potassium tert-butoxide enhances interchange reactions compared to the non catalyzed process. The product of degradation contains mainly the original polyol capped with a phosphonate group and a phosphorous dimmer of the original polyol.

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Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of the Chemical Degradation of Flexible Polyurethane Foam Wastes with Dimethyl H-phosphonate with Different Catalysts

Molero

Mitova

Troev

et al. 2010

Journal of Macromolecular Science, Part A

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Glycolysis of flexible polyurethane foam in recycling of car seats

Beneš

Rosner²,

Holler

et al. 2006

Polymers for Advanced Techs

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Flexible polyurethane foam scrap was chemically decomposed via glycolysis. Optimal reaction conditions for glycolysis were determined: temperature, 2208C, polyurethane/glycol ratio, 1:1; reaction time, 2.5 hr; diethylene glycol or dipropylene glycol as reagents. Two types of polyurethane scrap were tested; both gave the recycled polyols having the same properties, which is advantageous for possible applications on a commercial scale. A mixture of the virgin and recycled polyols (up to 36 wt%) was used to manufacture rigid polyurethane foams. No undesirable influence of the recyclates on process parameters (cream time, gel time) was found. The end-use properties of the rigid foams were practically the same in the whole range of tested concentrations of recyclates. A fine cellular structure of all tested foams was found.

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