Avaliação do MOE e MOR de painéis homogêneos produzidos com serragem, polietileno tereftalato e poliuretano derivado de óleo de mamona
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Data
2022-07-29
Autores
Silva, Josislene dos Santos Paulino da
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Universidade Estadual Paulista (Unesp)
Resumo
A madeira é uma matéria-prima com ampla disponibilidade no Brasil, que pode ser empregada nos mais diversos setores, o que gera uma preocupação quanto a exploração de florestas nativas e geração de resíduos no meio ambiente. Uma opção viável, que vem ganhando espaço, é a utilização de madeiras de reflorestamento na produção de painéis aglomerados homogêneos, com adição de outros tipos de resíduos, como o plástico, de modo a reduzir os impactos negativos causados na natureza. Neste sentido, o presente trabalho visa a produção de painéis aglomerados homogêneos produzidos com serragem de madeira das espécies Pinus elliottii e Pinus Taeda aglutinadas com 20% de adesivo Poliuretano derivado de óleo de mamona (PUR), avaliando-se a influência da adição de diferentes quantidades de Polietileno Tereftalato (PET), que é amplamente encontrado em forma de garrafas de refrigerantes e água mineral. Foram elaboradas duas misturas contendo serragem e PET e uma mistura de referência sem adição de PET. Para cada mistura produziu-se três painéis com densidade nominal da madeira de 0,35 g/cm³, prensados à uma temperatura de 160 ºC durante 6 minutos com pressão de 5 MPa. Foram avaliadas as propriedades mecânicas dos painéis, sendo elas o módulo de resistência à flexão estática (MOR) e o módulo de elasticidade (MOE), utilizando-se a ABNT NBR 14810-2 (2018). Com base nos resultados obtidos, os painéis com maior teor de PET apresentaram melhor módulo de resistência à flexão estática e os painéis com um teor de PET intermediário garantiram melhor módulo de elasticidade.
Wood is a raw material widely available in Brazil, which can be used in the most diverse sectors, which raises a concern about the exploitation of native forests and the generation of waste in the environment. A viable option, which has been gaining ground, is the use of reforested wood in the production of homogeneous particle boards, with the addition of other types of waste, such as plastic, in order to reduce the negative impacts caused on nature. In this sense, the present work aims at the production of homogeneous particle boards produced with sawdust of the species Pinus elliottii and Pinus Taeda bonded with Polyurethane derived from castor oil (PUR), evaluating the influence of the addition of different amounts of Polyethylene Terephthalate (PET), which is widely found in the form of soft drink and mineral water bottles. Two mixtures containing sawdust and PET and a reference mixture without the addition of PET were prepared. For each mixture, three panels were produced with a nominal density of 0.35 g/cm³, pressed at a temperature of 160 °C for 6 minutes with a pressure of 70tf. The mechanical properties of the panels were evaluated, being the modulus of resistance to static bending (MOR) and the modulus of elasticity (MOE), using ABNT NBR 14810-2 (2018). Based on the results obtained, the panels with the highest PET content showed a higher modulus of resistance to static bending and the panels with an intermediate PET content ensured better modulus of elasticity.
Wood is a raw material widely available in Brazil, which can be used in the most diverse sectors, which raises a concern about the exploitation of native forests and the generation of waste in the environment. A viable option, which has been gaining ground, is the use of reforested wood in the production of homogeneous particle boards, with the addition of other types of waste, such as plastic, in order to reduce the negative impacts caused on nature. In this sense, the present work aims at the production of homogeneous particle boards produced with sawdust of the species Pinus elliottii and Pinus Taeda bonded with Polyurethane derived from castor oil (PUR), evaluating the influence of the addition of different amounts of Polyethylene Terephthalate (PET), which is widely found in the form of soft drink and mineral water bottles. Two mixtures containing sawdust and PET and a reference mixture without the addition of PET were prepared. For each mixture, three panels were produced with a nominal density of 0.35 g/cm³, pressed at a temperature of 160 °C for 6 minutes with a pressure of 70tf. The mechanical properties of the panels were evaluated, being the modulus of resistance to static bending (MOR) and the modulus of elasticity (MOE), using ABNT NBR 14810-2 (2018). Based on the results obtained, the panels with the highest PET content showed a higher modulus of resistance to static bending and the panels with an intermediate PET content ensured better modulus of elasticity.
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Palavras-chave
Painéis aglomerados, Madeira, Pinus elliottii, Pinus Taeda, PET, Adesivo Poliuretano, Particle boards, Wood, Polyurethane Adhesive