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Influence of a Catalyst in Obtaining a Post-consumer Pet-Based Alkyd Resin that Meets Circular Economy Principles

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Abstract

The paper studied the influence of a catalyst, comparing it with its traditional counterparts, in the process of obtaining a polyethylene terephthalate (PET)-based alkyd resin from post-consumer beverage bottles and how it consumes raw materials and generates waste. The resin was obtained in two phases: (1) glycerol and soybean oil alcoholysis reaction, a renewable material, for polyalcohol production, and (2) polyalcohol and polyacid esterification reaction to obtain the alkyd resin (reaction via solvent). A lithium octoate catalyst (OctLi) was used, not traditional in the alcoholysis reaction, and a fraction of the polyacid replaced by post-consumer PET at a proportion of up to 24% by weight in the esterification reaction. The OctLi catalyst caused a reaction in 30 min, compared to zinc acetate (120 min) and lithium hydroxide (LiOH, 60 min). Using post-consumer PET in obtaining the alkyd resin also decreased the esterification reaction time by 22% (8% PET), 67% (16% PET) and 72% (24% PET), compared to esterification without PET. The reaction time, considering alcoholysis with OctLi and partial esterification with PET (with 24% PET), was 180 min. Adding alcoholysis time with the LiOH catalyst and esterification without PET raises the reaction time to 600 min. Process water formed during the esterification stage declined by 15% (8% PET), 50% (16% PET) and 77% (24% PET), compared to the reaction without PET. The shorter reaction time resulted in less equipment use and consequent lower energy consumption. Another result was that the alkyd resin obtained with 8% PET was adequate for paint formulations.

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Acknowledgements

The authors thank the Research Support Foundation of Rio de Janeiro State (FAPERJ) for the grant awarded to Elaine M. Senra, the Coordination for the Improvement of Higher Education Personnel (CAPES) and the National Council for Scientific and Technological Development (CNPq).

Funding

This work is part of Elaine Senra's master's thesis developed at the Laboratories of the Instituto de Macromoleculas Professora Eloisa Mano of the Federal University of Rio Janeiro, with the support of the National Council for Scientific and Technological Development (CNPq), Coordination for the Improvement of Higher Education Personnel (CAPES) and Carlos Chagas Filho Foundation for Research Support of the State of Rio de Janeiro (FAPERJ).

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  1. Instituto de Macromoléculas Professora Eloisa Mano/Programa em Ciência e Tecnologia de Polímeros, Universidade Federal do Rio de Janeiro, Avenida Horácio Macedo 2.030, Centro de Tecnologia, Bloco J, Rio de Janeiro, RJ, CEP 21941-598, Brazil

    Elaine M. Senra, Antônio E. F. A. da Silva, Leila L. Y. Visconte, Ana L. N. Silva & Elen B. A. V. Pacheco

  2. Escola Politécnica/Programa de Engenharia Ambiental, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos 149, Centro de Tecnologia, Bloco A, Ilha do Fundão, Rio de Janeiro, RJ, CEP 21941-909, Brazil

    Leila L. Y. Visconte, Ana L. N. Silva & Elen B. A. V. Pacheco

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  1. Elaine M. Senra
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Senra, E.M., da Silva, A.E.F.A., Visconte, L.L.Y. et al. Influence of a Catalyst in Obtaining a Post-consumer Pet-Based Alkyd Resin that Meets Circular Economy Principles. J Polym Environ 30, 3761–3778 (2022). https://doi.org/10.1007/s10924-022-02471-9

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