Exploration of recycled tires for development of new products

Detalhes bibliográficos
Autor(a) principal: Amorim, Bernardo Nuno Guerra
Data de Publicação: 2018
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/25802
Resumo: It is estimated that, in industrialized societies, over 9 to 10 Kg of tires per habitant are annually discarded and pilled in huge deposits with serious environmental problems associated. It is of maximum importance recycling used tires and developing new applications and new products of recycled tires. In this work, recycled tire granulates, produced by RECIPNEU, are incorporated in polylactic acid (PLA) to prepare polymeric composite formulations to be extruded into a filament for sustainable additive manufacturing of an acoustic panel. The preparation of the formulations involved a first theoretical/modelling study based on the mechanical properties and density to “guide” the establishment of the amount of recycled tire granulates to be included. Then, some formulations containing rubber percentages from 10 to 60 wt.% were prepared using a Brabender mixer. Then, upon extrusion of the filaments with the different formulations, it was verified that the composite mixture containing 20 wt.% of rubber was the one presenting a higher degree of homogeneity despite its brittleness. A plasticizer, namely glycerol, was added to improve the filament flexibility and allow its rolling. A printable filament was obtained, and small prototypes of acoustic type panels were printed. Acoustic properties were determined in the laboratory of Professor Doctor Luís Godinho, director of the Department of Civil Engineering of the University of Coimbra, using the Wave Impedance Tube method, and were compared with similar shaped printed pure PLA. Resuming, recycling tires waste were successfully incorporated in PLA and the polymeric composites could be extruded in filament form that can be used as a sustainable material for additive manufacturing. The acoustic performance of the printed panels, tested by Wave Impedance Tube method, revealed an inferior performance when compared with standard mineral wool sample, being necessary to perform more studies in this field
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spelling Exploration of recycled tires for development of new productsRubberRecyclingCryogenic processThermoplasticFilament extrusionAdditive manufacturingAcoustic panelCircular economyIt is estimated that, in industrialized societies, over 9 to 10 Kg of tires per habitant are annually discarded and pilled in huge deposits with serious environmental problems associated. It is of maximum importance recycling used tires and developing new applications and new products of recycled tires. In this work, recycled tire granulates, produced by RECIPNEU, are incorporated in polylactic acid (PLA) to prepare polymeric composite formulations to be extruded into a filament for sustainable additive manufacturing of an acoustic panel. The preparation of the formulations involved a first theoretical/modelling study based on the mechanical properties and density to “guide” the establishment of the amount of recycled tire granulates to be included. Then, some formulations containing rubber percentages from 10 to 60 wt.% were prepared using a Brabender mixer. Then, upon extrusion of the filaments with the different formulations, it was verified that the composite mixture containing 20 wt.% of rubber was the one presenting a higher degree of homogeneity despite its brittleness. A plasticizer, namely glycerol, was added to improve the filament flexibility and allow its rolling. A printable filament was obtained, and small prototypes of acoustic type panels were printed. Acoustic properties were determined in the laboratory of Professor Doctor Luís Godinho, director of the Department of Civil Engineering of the University of Coimbra, using the Wave Impedance Tube method, and were compared with similar shaped printed pure PLA. Resuming, recycling tires waste were successfully incorporated in PLA and the polymeric composites could be extruded in filament form that can be used as a sustainable material for additive manufacturing. The acoustic performance of the printed panels, tested by Wave Impedance Tube method, revealed an inferior performance when compared with standard mineral wool sample, being necessary to perform more studies in this fieldEstima-se que, em sociedades industrializadas, cerca de 9 a 10 Kg de pneus por habitante são, anualmente, descartados e despejados em enormes depósitos que acarretam sérios problemas ambientais. É de extrema importância reciclar pneus usados e desenvolver novas aplicações e novos produtos tendo por base os pneus reciclados. É precisamente este o enquadramento em que se realiza este trabalho de mestrado. Neste trabalho, granulados de pneus reciclados, produzidos pela RECIPNEU, são incorporados em ácido poliláctico (PLA) de forma a preparar formulações de compósitos poliméricos para serem extrudidos em forma de filamento e serem, posteriormente, testados como material sustentável para manufatura aditiva de um painel acústico. A preparação das formulações envolveu um estudo teórico prévio, baseado nas propriedades mecânicas e densidade, para definir a quantidade de granulados de pneus reciclados a ser incorporada. De seguida, formulações contendo 10 a 60 %, em peso, de granulados de borracha foram preparadas usando uma misturadora Brabender. Após extrusão dos filamentos com as diferentes formulações, verificou-se que o compósito contendo 20 %, em peso, de granulado de borracha foi o que apresentou a melhor homogeneidade, apesar da sua fragilidade. Adicionou-se um plasticizante, glicerol, de modo a melhorar a flexibilidade do filamento e permitir o seu enrolamento. As condições de extrusão foram otimizadas de modo a obter um filamento capaz de ser impresso, sendo este testado através da impressão de um pequeno protótipo de um painel acústico. As propriedades acústicas foram determinadas pelo Dr. Luís Godinho, Diretor do Departamento de Engenharia Civil da Universidade de Coimbra, através do método do tubo de impedância, e comparadas com uma amostra de PLA puro, de forma idêntica. Resumindo, os granulados de pneus reciclados foram incorporados com sucesso em PLA, sendo possível extrudir os compósitos poliméricos em forma de filamento que pode ser usado como material sustentável para a manufatura aditiva. É possível imprimir painéis customizados, contudo estes não apresentam boas propriedades acústicas, não sendo, na sua forma atual, uma boa solução para soluções acústicas. A percentagem de borracha necessita de ser otimizada, de modo a melhorar a performance acústica2018-12-172018-12-17T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/25802TID:202233286engAmorim, Bernardo Nuno Guerrainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:50:00Zoai:ria.ua.pt:10773/25802Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:58:58.178061Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Exploration of recycled tires for development of new products
title Exploration of recycled tires for development of new products
spellingShingle Exploration of recycled tires for development of new products
Amorim, Bernardo Nuno Guerra
Rubber
Recycling
Cryogenic process
Thermoplastic
Filament extrusion
Additive manufacturing
Acoustic panel
Circular economy
title_short Exploration of recycled tires for development of new products
title_full Exploration of recycled tires for development of new products
title_fullStr Exploration of recycled tires for development of new products
title_full_unstemmed Exploration of recycled tires for development of new products
title_sort Exploration of recycled tires for development of new products
author Amorim, Bernardo Nuno Guerra
author_facet Amorim, Bernardo Nuno Guerra
author_role author
dc.contributor.author.fl_str_mv Amorim, Bernardo Nuno Guerra
dc.subject.por.fl_str_mv Rubber
Recycling
Cryogenic process
Thermoplastic
Filament extrusion
Additive manufacturing
Acoustic panel
Circular economy
topic Rubber
Recycling
Cryogenic process
Thermoplastic
Filament extrusion
Additive manufacturing
Acoustic panel
Circular economy
description It is estimated that, in industrialized societies, over 9 to 10 Kg of tires per habitant are annually discarded and pilled in huge deposits with serious environmental problems associated. It is of maximum importance recycling used tires and developing new applications and new products of recycled tires. In this work, recycled tire granulates, produced by RECIPNEU, are incorporated in polylactic acid (PLA) to prepare polymeric composite formulations to be extruded into a filament for sustainable additive manufacturing of an acoustic panel. The preparation of the formulations involved a first theoretical/modelling study based on the mechanical properties and density to “guide” the establishment of the amount of recycled tire granulates to be included. Then, some formulations containing rubber percentages from 10 to 60 wt.% were prepared using a Brabender mixer. Then, upon extrusion of the filaments with the different formulations, it was verified that the composite mixture containing 20 wt.% of rubber was the one presenting a higher degree of homogeneity despite its brittleness. A plasticizer, namely glycerol, was added to improve the filament flexibility and allow its rolling. A printable filament was obtained, and small prototypes of acoustic type panels were printed. Acoustic properties were determined in the laboratory of Professor Doctor Luís Godinho, director of the Department of Civil Engineering of the University of Coimbra, using the Wave Impedance Tube method, and were compared with similar shaped printed pure PLA. Resuming, recycling tires waste were successfully incorporated in PLA and the polymeric composites could be extruded in filament form that can be used as a sustainable material for additive manufacturing. The acoustic performance of the printed panels, tested by Wave Impedance Tube method, revealed an inferior performance when compared with standard mineral wool sample, being necessary to perform more studies in this field
publishDate 2018
dc.date.none.fl_str_mv 2018-12-17
2018-12-17T00:00:00Z
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