Effects of the recycled poly(ethylene terephthalate) fibers on the rigid polyurethane foam

Rigid polyurethane foam (PUF) was successfully prepared from a novel oligo-ester-ether-diol obtained from the glycolysis of waste poly(ethylene terephthalate) (PET) bottles via reaction with diethylene glycol (DEG) in the presence of ZnSO4 7H2O. The LC-MS analysis of the oligodiol enabled us to identify 67 chemical homologous structures that were composed of zero to four terephthalate (T) ester units and two to twelve monoethylene glycol (M) ether units. The flame retardant, morphological, compression, and thermal properties of rigid PUFs with and without triphenyl phosphate (TPP) were determined. The Tg values showed that TPP played a role of not only being a flame retardant, but also a plasticizer. PUF with a rather low TPP loading had an excellent flame retardancy and high thermal stability. A loading of 10 wt % TPP not only achieved a UL-94 V-0 rating, but also obtained an LOI value of 21%. Meanwhile, the PUF without a flame retardant did not achieve a UL-94 HB rating; the sample completely burned to the holder clamp and yielded a low LOI value (17%). The fire properties measured with the cone calorimeter were also discussed, and the results further proved that the ﬂame retardancy of the PUF with the addition of TPP was improved significantly. The polymeric material meets the demands of density and compression strength for commercial PUF, as well as the needs of environmental development. The current study may help overcome the drawback of intrinsic high ﬂammability and enlarge the ﬁre safety applications of materials with a high percentage of recycled PET.

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Study of flame retardancy, thermal and physical properties of rigid polyurethane foam based on recycled poly(ethylene terephthalate) using non-halogen flame retardant

Science and Technology Development Journal - Natural Sciences ◽

10.32508/stdjns.v5i2.1011 ◽

2021 ◽

Vol 5 (2) ◽

pp. first

Author(s):

Hà Tuyết Minh Nguyễn ◽

DongQuy Hoang ◽

Thị Chi Phạm

Keyword(s):

Flame Retardant ◽

Ethylene Terephthalate ◽

Polyurethane Foams ◽

Polymer Materials ◽

Rigid Polyurethane Foam ◽

Recycled Pet ◽

Foam Structure ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene ◽

Thermal Stability Of

Bis(2-hydroxyethyl) terephthalate (BHET) obtained from waste poly(ethylene terephthalate) bottles was used to synthesize polyurethane foams (B-PUF) and the fireproof B-PUF in the presence of nonhalogen flame retardant, namely, aluminum hydrogen phosphonate (AHP). Loading of 25 php AHP was needed for B-PUF/AHP to achieve UL-94 V-0 rating. The thermal stability of B-PUF was improved with the addition of AHP through the thermogravimetric analysis (TGA) results. In addition, other properties such as density and foam structure were also investigated. The outcomes of this study also confirmed that the B-PUF prepared from recycled PET not only were composed of a high percentage of waste poly(ethylene terephthalate), which could help reduce the amount of recycled polymer materials and improved waste management but also met the high demands for the fire safety of polymer applications.

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Fireproof behavior of polyurethane foam based on waste poly(ethylene terephthalate) using aluminum hydrogen phosphonate flame retardant

Science and Technology Development Journal - Natural Sciences ◽

10.32508/stdjns.v2i2.739 ◽

2019 ◽

Vol 2 (2) ◽

pp. 88-94

Author(s):

Tram Tran Thi Ai Pham ◽

Quy Thi Dong Hoang

Keyword(s):

Flame Retardant ◽

Polyurethane Foam ◽

Ethylene Terephthalate ◽

Moisture Absorption ◽

Unsaturated Polyester ◽

Weight Ratio ◽

High Strength ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene ◽

Flammable Material

Poly(ethylene terephthalate) is a widely used polymer in the blow molding bottles, electron industry, texiile industry and can be recycled to synthesize new materials such as polyurethane foam (PUf) and unsaturated polyester (UP). One of them, PUf has many desirable properties such as low thermal conductivity, low density, excellent dimensional stability, high strength-to-weight ratio, low moisture permeability and low water absorption. However, PUf is a highly flammable material. In this study, aluminum hydrogen phosphonate (AHP) was synthesized in order to investigate their flame retarding performances for PUf. UL-94 V-1 was obtained at 15 phr loading of AHP. The incorporation of flame retardant increased the fireresistant property of PUf. In addition, other properties such as density, foam structure, and water and moisture absorption were also investigated.

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