Effect of different concentration of rapeseed oil and recycled poly (ethylene terephthalate) in polyols for rigid polyurethane foams

Ivdre, Aiga; Fridrihsone, Anda; Āboliņš, Arnis; Cābulis, Uģis

doi:10.1177/0021955x16670585

Cited by 15 publications

(16 citation statements)

References 37 publications

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“…The best retention of thermal conductivity was shown in NEO series PUR foams from PET-based aromatic polyester polyol. The same results were observed in previous investigations by our research group [21,32]. The retention of thermal conductivity depends on the blowing agent gas diffusion rate through rigid PUR foam material.…”

Section: Thermal Conductivitysupporting

confidence: 90%

“…The incorporation of hard segments into the structure of PUR foam improves mechanical properties [19]. For this purpose, polyols from recycled polyethylene terephthalate (PET) can be successfully employed for PUR formulations to obtain rigid foams [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Novel polyols are compatible with a physical blowing agent, less viscous, and more stable against crystallization. Therefore, these polyols are suitable for the preparation of rigid PUR foams [21,32,33].…”

Section: Introductionmentioning

confidence: 99%

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Rigid Polyurethane Foams with Various Isocyanate Indices Based on Polyols from Rapeseed Oil and Waste PET

et al. 2020

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Developing polyols derived from natural sources and recycling materials attracts great interest for use in replacing petroleum-based polyols in polyurethane production. In this study, rigid polyurethane (PUR) foams with various isocyanate indices were obtained from polyols based on rapeseed oil and polyethylene terephthalate (RO/PET). The various properties of the prepared PUR foams were investigated, and the effect of the isocyanate index was evaluated. The closed-cell content and water absorption were not impacted by the change of the isocyanate index. The most significant effect of increasing the isocyanate index was on the dimensional stability of the resulting foams. This is due to the increased crosslink density, as evidenced by the increased formation of isocyanurate and increase of the glass transition temperature. Additionally, the influence on compression strength, modulus, and long-term thermal conductivity were evaluated and compared with reference PUR foams from commercially available polyols. Rigid PUR foams from RO/PET polyol were found to be competitive with reference materials and could be used as thermal insulation material.

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Section: Thermal Conductivitysupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Rigid Polyurethane Foams with Various Isocyanate Indices Based on Polyols from Rapeseed Oil and Waste PET

et al. 2020

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“…The glycolysis products of waste PET can be used as raw materials for the coating industry. For example, bis(2-hydroxyethyl) terephthalate (BHET) containing free hydroxyl groups [13,16] can be obtained through the glycolysis of waste PET, and polyols and part of polyacids can be replaced to synthesize polyurethanes [14,15,17], epoxy resin [17][18][19], saturated or unsaturated polyesters [5,20] and alkyd resins [4,13].…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the ester bonds in waste PET can be hydrolysed [1,7], alcoholysed [1,8], glycolysed [1,9] and ammonolysed [1,10]. Among them, glycolysis is an important and efficient method for chemical recovery of waste PET, such as ethylene glycol (EG) [11], dipropylene glycol (DPG) [12], trimethylpropane (TMP) [1,13], neopentyl glycol (NPG) [1,14] and pentaerythritol (PE) [1,15] had been applied for glycolysis of waste PET.…”

Section: Introductionmentioning

confidence: 99%

Preparation of autoxidative water-reducible alkyd resins from waste polyethylene terephthalate

et al. 2021

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In this paper, the waste polyethylene terephthalate (PET) was glycolysed by trimethylolpropane with zinc acetate as catalyst. The effects of different content glycolysis product of waste PET on the appearance, viscosity, particle size and molecular weight of autoxidative water-reducible alkyd resins and the corresponding film adhesion, flexibility, impact resistance, gloss, hardness and chemical resistance were studied. Meanwhile, experimental results were compared with commercial water-reducible alkyd and water-reducible alkyd without the glycolysis product of waste PET. The results show that the maximum concentration of PET in autoxidative water-reducible alkyd resins can reach 8.5 wt%, and the molecular weight, particle size and viscosity of water-reducible alkyd resin do not change much with the increase of PET concentration. The introduction of PET resulted in the viscosity of water-reducible alkyd resins being greater than that of water-reducible alkyd resin without PET; this is mainly because PET contains harder terephthalic acid monomer units. However, the particle size of water-reducible alkyd resins with waste PET is significantly lower than that of the water-reducible alkyd resin without PET; this is due to PET-free water-reducible alkyd resin containing more pentaerythritol with greater steric hindrance. In addition, the hardness of the water-reducible alkyd resin paint film (PET content is 8.5%) reaches 1H, which is higher than the hardness (HB) of the water-reducible alkyd resin paint film without PET and the commercial alkyd resin paint film, while the physical properties and chemical resistance of the former are comparable to those of the latter two kinds of paint films. Therefore, the use of waste PET in water-borne coatings systems not only reduces the cost of coatings, but also opens up a new market for recycled PET, which may contribute a promising method for management of waste PET.

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Synthesis and characterization of polyurethane rigid foam by using feedstocks received from renewable and recyclable resources

2023

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The mimicry reactions used in the industrial field based on pure materials to obtain products is very important in order to achieve a circular economy and a green environment. This time around, the idea is that all raw materials are wastes. In addition to synthesizing biodiesel, this study aims to synthesize polyurethane rigid foams from recyclable materials such as liquid wastes and solid plastic wastes. The study follows preparation of a new class of biopolyols by reacting a mixture of crude glycerin-based polyol and epoxidized used cooking oil with polyethylene terephthalate, polyurethane, and bisphenol-polycarbonate wastes. Then, fabrication of polyurethane rigid foams by blending synthesized biopolyols with commercial polyol at ratios 20%, 40%, and 60% occurs. The properties of biopolyols and fabricated rigid foams was investigated by nuclear magnetic resonance, infrared spectrometer, thermal gravimetric analyzer, scanning electron microscope, and dynamic mechanical thermal analyzer. The results show that the biopolyols are valuable products for polyurethane manufactures. Moreover, the fabricated rigid foams show nonsignificant changes at the commercial and industrial level.

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Effect of different concentration of rapeseed oil and recycled poly (ethylene terephthalate) in polyols for rigid polyurethane foams

Cited by 15 publications

References 37 publications

Rigid Polyurethane Foams with Various Isocyanate Indices Based on Polyols from Rapeseed Oil and Waste PET

Rigid Polyurethane Foams with Various Isocyanate Indices Based on Polyols from Rapeseed Oil and Waste PET

Preparation of autoxidative water-reducible alkyd resins from waste polyethylene terephthalate

Synthesis and characterization of polyurethane rigid foam by using feedstocks received from renewable and recyclable resources

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