Preparação de compósitos sanduíche de filme protetivo de prepregs com adição de fibras de carbono e fibras de vidro
Data
2023-12-07
Autores
Castro, Lucca Paixão 
Orientadores
Passador, Fabio Roberto
Tipo
Trabalho de conclusão de curso
Título da Revista
ISSN da Revista
Título de Volume
Resumo
As fibras de carbono (FC) e fibras de vidro (FV) pré-impregnadas com resina epóxi, conhecidas como prepregs, são comercializadas em rolos e separadas por um filme protetivo para evitar que as camadas de prepregs entrem em contato durante o transporte e
armazenamento. Esses filmes, geralmente composto por poliolefinas, são retirados e descartados durante o processo de laminação. Na maioria das vezes, os filmes protetivos são incinerados pois, para a indústria, a sua única finalidade é proteger o prepreg. Este trabalho de conclusão de curso (TCC) teve como objetivo realizar um estudo de reaproveitamento dos filmes protetivos buscando utilizar esse material da forma como é recebido. Primeiramente, o filme protetivo foi caracterizado por meio de análise térmica de calorimetria exploratória diferencial (DSC), a fim de identificar a sua composição e determinar as temperaturas de processamento do laminado. Em seguida, foram produzidos compósitos do tipo sanduíche de filme protetivo-fibras-filme protetivo por prensagem a quente, e foram utilizadas camadas de FC ou FV secas para a conformação dos compósitos. Foram utilizadas 24 camadas do filme polimérico e 2 camadas de fibras secas, a disposição utilizada foi, oito camadas do filme polimérico, uma camada de fibra seca, oito camada do filme, uma camada de fibra seca e, por fim, oito camadas de filme. Os compósitos foram preparados em uma prensa a quente e, após o processamento, corpos de prova foram cortados e avaliadas as propriedades mecânicas de resistência à tração, seguida da análise visual macroscópica da região da fratura. Observou-se uma boa interação das camadas de filme protetivo com as fibras secas, tanto FC quanto FV, sem a observação de delaminação de camadas durante o ensaio de tração uniaxial, logo as propriedades mecânicas dos compósitos sanduíches foram governadas pelas propriedades mecânicas das fibras. Neste trabalho foi possível obter compósitos sanduíches a partir de materiais reciclados contribuindo com a economia circular e com a sustentabilidade.
Pre-impregnated carbon fibers (CF) and glass fibers (GF), known as prepregs, in epoxy resin are sold in rolls and separated by a protective film to prevent the layers of prepregs from coming into contact during transportation and storage. This film, generally composed of polyolefins, are removed during the lamination process. Most of the time, protective films are incinerated because, for the industry, their only purpose to protect the carbon prepreg. The objective of this work is to study the reuse of protective films, aiming to utilize this material as received, in sheet form. Sandwich composites consisting of the protective film-fibers- protective film were produced using a hot press. CF and GF were tested for composite forming. The identification of the protective film was evaluated through differential scanning calorimetry (DSC), allowing to the determination of the laminate processing temperatures. Subsequently, in the production of these sandwich laminates, dry fibers were used as reinforcement. 24 layers of polymeric film and 2 layers of dry fibers were used, the arrangement used was eight layers of polymeric film, one layer of dry fiber, eight layers of film, one layer of dry fiber and, finally, eight layers of film. The composites were prepared in a hot press and, after processing, specimens were cut and the mechanical properties (tensile test) were evaluated, followed by macroscopic visual analysis of the fracture region. A good interaction of the protective film layers with the dry fibers, both CF and GF, was observed, without the observation of layer lamination during the tensile test, therefore the mechanical properties of the sandwich composites were governed by the mechanical properties of the fibers. In this work, it was possible to obtain sandwich composites from recycled materials, contributing to the circular economy and sustainability.
Pre-impregnated carbon fibers (CF) and glass fibers (GF), known as prepregs, in epoxy resin are sold in rolls and separated by a protective film to prevent the layers of prepregs from coming into contact during transportation and storage. This film, generally composed of polyolefins, are removed during the lamination process. Most of the time, protective films are incinerated because, for the industry, their only purpose to protect the carbon prepreg. The objective of this work is to study the reuse of protective films, aiming to utilize this material as received, in sheet form. Sandwich composites consisting of the protective film-fibers- protective film were produced using a hot press. CF and GF were tested for composite forming. The identification of the protective film was evaluated through differential scanning calorimetry (DSC), allowing to the determination of the laminate processing temperatures. Subsequently, in the production of these sandwich laminates, dry fibers were used as reinforcement. 24 layers of polymeric film and 2 layers of dry fibers were used, the arrangement used was eight layers of polymeric film, one layer of dry fiber, eight layers of film, one layer of dry fiber and, finally, eight layers of film. The composites were prepared in a hot press and, after processing, specimens were cut and the mechanical properties (tensile test) were evaluated, followed by macroscopic visual analysis of the fracture region. A good interaction of the protective film layers with the dry fibers, both CF and GF, was observed, without the observation of layer lamination during the tensile test, therefore the mechanical properties of the sandwich composites were governed by the mechanical properties of the fibers. In this work, it was possible to obtain sandwich composites from recycled materials, contributing to the circular economy and sustainability.