Glycolysis recycling of rigid waste polyurethane foam from refrigerators

Zhu, Ping; Cao, Zhengjun; Chen, Y.; Zhang, X.J.; Qian, Guangren; Chu, Yuliang; Zhou, Ming

doi:10.1080/09593330.2014.918180

Cited by 45 publications

(33 citation statements)

References 28 publications

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“…Petrochemical polyols in the PUR industry can also be substituted with recycled polyols obtained from the glycolysis of PUR waste [5][6][7]. The current effort in the elimination of petrochemical feedstock led us to develop a new "green" recycling process of PUR waste utilizing renewable reagents for the transformation of solid PUR waste into liquid recycled polyols.…”

Section: Pianki Poliuretanowe Wytworzone Na Bazie Recyklowanych Poliomentioning

confidence: 99%

Polyurethane foams based entirely on recycled polyols derived from natural oils

Horák

Beneš

2015

Polimery

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Flexible polyurethane (PUR) foam was chemically recycled using two types of oleochemical polyols based on rapeseed oil and waste fish oil. The functional hydroxyl groups of the oleochemical polyols reacted with the urethane and the disubstituted urea structures of flexible PUR foam at temperatures around 200°C. The liquid recycled polyols with hydroxyl numbers ca. 175 mg KOH/g were obtained after 2 h of the reaction. Only the recycled polyols without additional virgin polyols were used for the preparation of low density PUR foams. PUR foams with free rise density of 30 and 50 kg/m 3 were prepared exhibiting semi-rigid character due to the presence of soft segments of fatty acid chains.

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Section: Pianki Poliuretanowe Wytworzone Na Bazie Recyklowanych Poliomentioning

confidence: 99%

Polyurethane foams based entirely on recycled polyols derived from natural oils

Horák

Beneš

2015

Polimery

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“…Glycolysis processes have been widely described in literature for almost every PU specialty, including flexible foams and rigid ones and also the denominated Coatings, Adhesives, Sealants and Elastomers . Glycolysis processes of reaction injection molding (RIM) and reinforced RIM PU have been also reported …”

Section: Introductionmentioning

confidence: 99%

Flexible polyurethane foams synthesized employing recovered polyols from glycolysis: Physical and structural properties

Simón

Lucas

Rodrı́guez

et al. 2017

J of Applied Polymer Sci

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Polyurethane (PU) is one of the most important polymers with a global production of 17.565 million tons, which makes its recycling an urgent task. Besides, the main goal of PU recycling is to recover constituent polyol as a valuable raw material that allows to obtain new PU with suitable properties. Split‐phase glycolysis can be considered the most interesting PU recycling process since provides high‐quality recovered products in terms of polyol purity. The aim of this work was to evaluate several recovered polyols as replacement of the raw flexible polyether polyol in the synthesis of new flexible PU foams. These recovered polyols come from the split‐phase glycolysis of different types of PU foams and employing as cleavage agents diethylene glycol or crude glycerol (biodiesel byproduct). The influence of the foam waste type and of the cleavage agent on the foams properties was analyzed. The recovered polyols were evaluated by performing several foaming tests according to the method of free expansion foaming of conventional flexible foam. Synthesized flexible foams containing different proportions of recovered polyols were characterized by means of scanning electron microscopy, density and tensile properties; obtaining similar and sometimes even better values compared to the foams manufactured from commercial polyols. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45087.

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“…3,4 Among others, the use of porous materials is a solution allowing vibroacoustic control with low weight addition, 5 even if recyclability remains a challenging issue. 6,7 Moreover, lightness is often associated with low mechanical properties, 8 in particular in terms of failure. 9 This could imply short lifetimes, in particular when the mechanical sollicitations are combined with thermal degradations.…”

Section: Introductionmentioning

confidence: 99%

Acoustic performances of silicone foams for sound absorption

Abbad

Jaboviste

Ouisse

et al. 2017

Journal of Cellular Plastics

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The aim of this study is the investigation of the link between the elaboration process, the microstructure and the acoustic behaviour of silicone foams obtained using a two-component silicone. Different parameters are varied such as the ratio of components, the addition of a thinning agent and the curing temperature, with the objective of understanding the influence of each parameter in the foam's acoustic absorption. The microstructure is analysed using SEM and acoustic properties are measured. Two non-acoustical properties of the porous material are also investigated, namely the porosity and the flow resistivity. Pore cell size and interconnected porosity have great impact on acoustical properties. Significant enhancements of the absorption properties could be obtained in the low frequency band by increasing the rate of agent B through an increase in the amount of interconnected porous cells. An improvement in absorption is observed in the higher frequency range when a thinning agent is added to the mixture. Representative models of the foam for acoustic simulations are obtained allowing estimation of the tortuosity, viscous and thermal characteristic length from acoustic measurements. These models are able to simulate the acoustic behaviour of the silicone foams when embedded in sound packages.

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Glycolysis recycling of rigid waste polyurethane foam from refrigerators

Cited by 45 publications

References 28 publications

Polyurethane foams based entirely on recycled polyols derived from natural oils

Polyurethane foams based entirely on recycled polyols derived from natural oils

Flexible polyurethane foams synthesized employing recovered polyols from glycolysis: Physical and structural properties

Acoustic performances of silicone foams for sound absorption

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