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<p>This work utilized ethanolamine to facilitate the chemical recycling of polyethylene terephthalate (PET), resulting in the formation of bis(2-hydroxyethyl) terephthalamide (BHETA), which was catalyzed by Zn–Al LDH and Zn–Ni–Al LDH. Both catalysts were synthesized using the co-precipitation method and analyzed using the Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Zn–Ni–Al LDH gives a higher yield than the Zn–Al LDH, which is 94.65% at the 1.5&#xa0;w/w of PET. FTIR of characterized BHETA provided information on the functional groups and differential scanning calorimetry (DSC), which showed a melting point of 198&#xa0;°C. BHETA, using different moles, further reacted with diethanolamide and phthalic anhydride (PA), which gives the polyesteramide polyol. The diethanolamide was synthesized from the waste cooking oil and diethanolamine. Using toluene diisocyanate (TDI) in a two-pack technique to crosslink the synthesized polyol, waste cooking oil (WCO)-based polyurethane was created. FTIR conducted a spectroscopic investigation of polyesteramide polyols derived from waste cooking oil. Mechanical testing was done on the cured coatings to ascertain their qualities, including cross-hatch adhesion tests, scratch resistance, gloss, and pencil hardness tests. BHETA-incorporated polyesteramide polyol shows better mechanical properties than plain polyesteramide polyol. The coatings displayed excellent acid resistance and mild alkali resistance.</p> Graphical abstract <p></p>

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Exploration of layered double hydroxide catalyst for depolymerizing polyethylene terephthalate and using a recycled product with waste cooking oil to synthesize polyurethane coatings

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Yogita Ubhale,
  • Komal Bhutra,
  • Shubham Desai,
  • Rushikesh Sonawane,
  • Atul Mukke,
  • Shrinivas Menkudle,
  • Aarti More

摘要

This work utilized ethanolamine to facilitate the chemical recycling of polyethylene terephthalate (PET), resulting in the formation of bis(2-hydroxyethyl) terephthalamide (BHETA), which was catalyzed by Zn–Al LDH and Zn–Ni–Al LDH. Both catalysts were synthesized using the co-precipitation method and analyzed using the Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Zn–Ni–Al LDH gives a higher yield than the Zn–Al LDH, which is 94.65% at the 1.5 w/w of PET. FTIR of characterized BHETA provided information on the functional groups and differential scanning calorimetry (DSC), which showed a melting point of 198 °C. BHETA, using different moles, further reacted with diethanolamide and phthalic anhydride (PA), which gives the polyesteramide polyol. The diethanolamide was synthesized from the waste cooking oil and diethanolamine. Using toluene diisocyanate (TDI) in a two-pack technique to crosslink the synthesized polyol, waste cooking oil (WCO)-based polyurethane was created. FTIR conducted a spectroscopic investigation of polyesteramide polyols derived from waste cooking oil. Mechanical testing was done on the cured coatings to ascertain their qualities, including cross-hatch adhesion tests, scratch resistance, gloss, and pencil hardness tests. BHETA-incorporated polyesteramide polyol shows better mechanical properties than plain polyesteramide polyol. The coatings displayed excellent acid resistance and mild alkali resistance.

Graphical abstract