Recycling of polyurethanes from laboratory to industry, a journey towards the sustainability

Simón, D.; Borreguero, Ana M.; Lucas, Antonio de; Rodrı́guez, Juan F.

doi:10.1016/j.wasman.2018.03.041

Cited by 211 publications

(250 citation statements)

References 66 publications

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“…As can be observed, the apparent densities are, in all cases, very low. This indicates that there was a problem related with the storage of this type of waste as well as its transportation and keeping since a low weight of the materials occupies a large volume [23]. The water absorption capacity of each waste varies according to the foam's structure and morphology.…”

Section: Determination Of Apparent and Real Density Water Absorptionmentioning

confidence: 99%

Characterization of Polyurethane Foam Waste for Reuse in Eco-Efficient Building Materials

Rojo¹,

Alameda²,

Rodríguez³

et al. 2018

Preprint

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In the European Union, the demand for polyurethane is continually growing. In 2017, the estimated production value of polyurethane was 700,400T, of which 27.3% is taken to landfill, which causes an environmental problem. In this paper the behaviour of various polyurethane foams from the waste of different types of industries will be analysed with the aim of assessing their potential use in construction materials. In order to this, the wastes were chemically tested by means of CHNS, TGA, and leaching tests. They were tested microstructurally by means of SEM. The processing parameters of the waste was calculated after finding out its granulometry and its physical properties i.e. density and water absorption capacity. In addition, the possibility of incorporating these wastes in plaster matrices was studied by determining its rendering in an operational context, finding out its mechanical resistance to flexion and compression at 7 days, its reaction to fire as well as its weight per unit of area and its thermal behaviour. The results show that in all cases, the waste is inert and does not undergo leaching. The generation process of the waste determines the foam’s microstructure in addition to its physical-chemical properties that directly affect building materials in which they are included, thus offering different ways in which they can be applied.

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Section: Determination Of Apparent and Real Density Water Absorptionmentioning

confidence: 99%

Characterization of Polyurethane Foam Waste for Reuse in Eco-Efficient Building Materials

Rojo¹,

Alameda²,

Rodríguez³

et al. 2018

Preprint

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show abstract

“…PET and PE, or polymer classes, e.g. polyurethanes, polyamides and bioplastics, have been reviewed in detail . In this review, we have dealt with traditional and promising recycling technologies in general, without specifically focusing on a certain polymer or method.…”

Section: Introductionmentioning

confidence: 99%

“…polyurethanes, polyamides and bioplastics, have been reviewed in detail. [17][18][19][20][21][22][23][24] In this review, we have dealt with traditional and promising recycling technologies in general, without specifically focusing on a certain polymer or method. We have emphasized the importance and necessity of the development of new process technologies for polymer waste utilization in order to make a positive impact on the world we live in.…”

Section: Introductionmentioning

confidence: 99%

Current approaches to waste polymer utilization and minimization: a review

Okan

Aydın

Barsbay

2018

J of Chemical Tech & Biotech

172

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The mass production of polymer products, in particular plastics, and their widespread use depending on the inherent advantages they have, make these materials ironically a threat to life on Earth. Polymer recycling is being considered as one of the most widely accepted remedies to the threat of growing amounts of plastic waste by both the public and scientists. In practice, recycling is associated with many difficulties, such as problems related to separation, sorting and cleaning operations, lack of fiscal subsidies, instability of selective garbage separation programs, high transport and electricity costs, etc. Still, a large section of society and the authorities agree on the necessity and importance of recycling to protect the environment, and natural habitats and resources for future generations in a balanced manner to conserve raw materials, and to reduce energy consumption, municipal solid waste production and greenhouse gas emission. The recycling effort is almost endless in itself and includes a variety of approaches such as refurbishing, mechanically reshaping, chemically treating, thermally utilizing, etc. Some novel approaches such as application in carbon capture or synthesis of carbon nanostructures from the plastic waste are among the new process technologies of recycling. From traditional and promising polymer waste utilization approaches, this review will highlight sustainable methods to reduce impacts of plastic waste on the environment. © 2018 Society of Chemical Industry

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“…Interest in the thermochemical decomposition of PUs has been growing steadily since the 1970s due to the possibility of process control through the use of various decomposition agents, temperature and catalysts . The most frequently used decompositions agents of PUs are water, glycols, alcohols, amines and organic acids, and the processes are called, respectively, hydrolysis, glycolysis, alcoholysis, aminolysis and acidolysis . During the decomposition reaction, the urethane bonds are broken resulting in the release of semi‐products which can be a mixture of compounds with terminal hydroxyl and/or amine groups.…”

Section: Introductionmentioning

confidence: 99%

The influence of different glycerine purities on chemical recycling process of polyurethane waste and resulting semi‐products

Trzebiatowska

Dzierbicka

Kaminska

et al. 2018

Polymer International

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Chemical recycling is the most favourable recycling method due to the possibility of polyol recovery. This work is dedicated to the utilisation of crude glycerine and polyurethane waste. It aims at determining the impact of the use of glycerine from the production of biodiesel with various degrees of purity as a cleavage agent on the decomposition process of polyurethane foam. The influence of glycerine purity on the chemical structure of recycling products was analysed using Fourier transform infrared and 1 H NMR spectroscopies and gel permeation chromatography. Hydroxyl and amine values were determined, and rheological measurements were performed. Glycerolysates showed minor structural differences due to the presence of amine groups and exhibited heterogeneous structure compared to original polyols. The ones obtained in decomposition using 84 and 99.5% glycerine had a lower viscosity below 0.45 Pa s at 50 ∘ C and higher hydroxyl number of 183 and 220 mg KOH g −1 , respectively, compared to the ones obtained with glycerine purity of 40 and 62% due to a different chemical structure. All of the products of decomposition were defined as non-Newtonian fluids, where viscosity depended on the shear rate. Selected glycerolysates were used in the production of cast polyurethanes with satisfactory mechanical properties.

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Recycling of polyurethanes from laboratory to industry, a journey towards the sustainability

Cited by 211 publications

References 66 publications

Characterization of Polyurethane Foam Waste for Reuse in Eco-Efficient Building Materials

Characterization of Polyurethane Foam Waste for Reuse in Eco-Efficient Building Materials

Current approaches to waste polymer utilization and minimization: a review

The influence of different glycerine purities on chemical recycling process of polyurethane waste and resulting semi‐products

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