Propriedades de painéis OSB fabricados com flocos esterificados

Detalhes bibliográficos
Autor(a) principal: Cabral, Carla Priscilla Távora
Data de Publicação: 2010
Tipo de documento: Tese
Idioma: por
Título da fonte: LOCUS Repositório Institucional da UFV
Texto Completo: http://locus.ufv.br/handle/123456789/574
Resumo: There is at present an incessant struggle in the search for new technologies that enable the use of various types of raw materials, principally residues, in the manufacture of high quality products that could satisfy the demands of the consumer market. In the market of structural panels, there thus appear the types of OSB that compete with plywood. Aiming to improve some of the characteristics of the panels, the present work shows the technical viability of the use of wooden flakes when modified chemically, in order to improve the dimensional stability of OSB panels. The species used in this work were the genus Eucalyptus (Eucalyptus grandis) and the genus Pinus (Pinus caribeae var. hondurensis), originating from the city of Viçosa, Minas Gerais, with the respective densities: 0.51 and 0.49 g/cm ³. The OSB panels of these woods were manufactured from flakes originating from planks and boards, dimensions 20.00 x 0.46 x 90.00 mm, and with pre-established density values of 0.70 g/cm³). The flakes were classified by size in manual sieves. The adhesive used for the production of the OSB panels was phenol formaldehyde employed in the proportion of 8% of solids in relation to the dry mass of flakes. The panels had in their composition 50% untreated flakes and 50% flakes esterified by phtalic, maleic and acetic anhydrides. Since the first two anhydrides were solid, there was the need of solubilizing in organic solvents such as ethylic alcohol and ethyl ether for the phtalic anhydride, and ethyl acetate and acetone in the case of maleic anhydride. In case of the acetic anhydride, the acetic and phtalic acids were employed to catalyze the reaction. The panels were pressed at a temperature of 140°C and 32 kgf/cm² of pressure, and were tested according to the standards of the ABNT (NBR 14810-3) of 2002 and ASTM-D 1037 of 1991. The results were compared using the standards ANSI/A 208.1 (1993) and CSA 0437-93 (1993). For the statistical analysis the test of averages and the Tukey Test were used, at a level of significance of 5%. The panels that presented the highest averages for absorption of water vapor were those manufactured with flakes of Pinus caribeae, esterified with maleic anhydride and acetone, for 24 hours, whereas, those which presented the lowest averages were those made with flakes of the species Eucalyptus grandis, treated with acetic anhydride and acetic acid for 3 hours. For the linear expansion test, the panels that presented greater dimensional stability were those manufactured with wood of the species Eucalyptus grandis, treated with acetic anhydride and acetic acid. In the absorption of water within 2 hours, the panels that presented the lowest averages were those manufactured with flakes of Eucalyptus grandis, esterified by maleic anhydride with acetone for 48 hours. In the absorption of water for 24 hours, the panels that presented the best results were those manufactured with the species Pinus caribeae, esterified with maleic anhydride, acetic anhydride with acetic acid. For Janka hardness, the largest averages obtained were from the panels made with flakes treated with acetic anhydride and phtalic acid. In the perpendicular tensile strength and longitudinal compression, the lowest averages were for the panels made with acetic anhydride and acetic acid. For the moduli of rupture and elasticity, in the longitudinal sense, the lowest averages were also for the panels made with acetic anhydride and acetic acid. The acetylation employing acetic acid influenced in a positive way the following physical properties: adsorption of water vapor, expansion in thickness and linear expansion in the OSB panels, making those of acetylated flakes more dimensionally stable. Nevertheless, there was a loss of strength in mechanical properties such as screw withdrawal, longitudinal compression and perpendicular tensile strength. When the acetic anhydride was associated with phtalic acid, most of the mechanical properties had a strength gain. The panels manufactured with acetylated flakes, treated with maleic and phtalic anhydrides, were also influenced by the type of solvent and reaction time, improving and/or making their physical and mechanical properties worse. On the whole, the panels presented satisfactory average values. Beyond this, for some mechanical tests, the results were well above the minimum values established by the standard, for most of the tests. This shows that these anhydrides present a great potential to be explored by the panel industries, requiring, however, more research.
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spelling Cabral, Carla Priscilla Távorahttp://lattes.cnpq.br/4588281790678445Lucia, Ricardo Marius Dellahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788298Z6Carneiro, Angélica de Cássia Oliveirahttp://lattes.cnpq.br/9474032258378987Vital, Benedito Rochahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787473J6Barcellos, Daniel Camarahttp://lattes.cnpq.br/6012920962189476Carvalho, Ana Márcia Macedo Ladeirahttp://lattes.cnpq.br/60173926589932882015-03-26T12:27:13Z2013-12-162015-03-26T12:27:13Z2010-05-07CABRAL, Carla Priscilla Távora. Properties of OSB panels manufactured with esterified flakes. 2010. 138 f. Tese (Doutorado em Manejo Florestal; Meio Ambiente e Conservação da Natureza; Silvicultura; Tecnologia e Utilização de) - Universidade Federal de Viçosa, Viçosa, 2010.http://locus.ufv.br/handle/123456789/574There is at present an incessant struggle in the search for new technologies that enable the use of various types of raw materials, principally residues, in the manufacture of high quality products that could satisfy the demands of the consumer market. In the market of structural panels, there thus appear the types of OSB that compete with plywood. Aiming to improve some of the characteristics of the panels, the present work shows the technical viability of the use of wooden flakes when modified chemically, in order to improve the dimensional stability of OSB panels. The species used in this work were the genus Eucalyptus (Eucalyptus grandis) and the genus Pinus (Pinus caribeae var. hondurensis), originating from the city of Viçosa, Minas Gerais, with the respective densities: 0.51 and 0.49 g/cm ³. The OSB panels of these woods were manufactured from flakes originating from planks and boards, dimensions 20.00 x 0.46 x 90.00 mm, and with pre-established density values of 0.70 g/cm³). The flakes were classified by size in manual sieves. The adhesive used for the production of the OSB panels was phenol formaldehyde employed in the proportion of 8% of solids in relation to the dry mass of flakes. The panels had in their composition 50% untreated flakes and 50% flakes esterified by phtalic, maleic and acetic anhydrides. Since the first two anhydrides were solid, there was the need of solubilizing in organic solvents such as ethylic alcohol and ethyl ether for the phtalic anhydride, and ethyl acetate and acetone in the case of maleic anhydride. In case of the acetic anhydride, the acetic and phtalic acids were employed to catalyze the reaction. The panels were pressed at a temperature of 140°C and 32 kgf/cm² of pressure, and were tested according to the standards of the ABNT (NBR 14810-3) of 2002 and ASTM-D 1037 of 1991. The results were compared using the standards ANSI/A 208.1 (1993) and CSA 0437-93 (1993). For the statistical analysis the test of averages and the Tukey Test were used, at a level of significance of 5%. The panels that presented the highest averages for absorption of water vapor were those manufactured with flakes of Pinus caribeae, esterified with maleic anhydride and acetone, for 24 hours, whereas, those which presented the lowest averages were those made with flakes of the species Eucalyptus grandis, treated with acetic anhydride and acetic acid for 3 hours. For the linear expansion test, the panels that presented greater dimensional stability were those manufactured with wood of the species Eucalyptus grandis, treated with acetic anhydride and acetic acid. In the absorption of water within 2 hours, the panels that presented the lowest averages were those manufactured with flakes of Eucalyptus grandis, esterified by maleic anhydride with acetone for 48 hours. In the absorption of water for 24 hours, the panels that presented the best results were those manufactured with the species Pinus caribeae, esterified with maleic anhydride, acetic anhydride with acetic acid. For Janka hardness, the largest averages obtained were from the panels made with flakes treated with acetic anhydride and phtalic acid. In the perpendicular tensile strength and longitudinal compression, the lowest averages were for the panels made with acetic anhydride and acetic acid. For the moduli of rupture and elasticity, in the longitudinal sense, the lowest averages were also for the panels made with acetic anhydride and acetic acid. The acetylation employing acetic acid influenced in a positive way the following physical properties: adsorption of water vapor, expansion in thickness and linear expansion in the OSB panels, making those of acetylated flakes more dimensionally stable. Nevertheless, there was a loss of strength in mechanical properties such as screw withdrawal, longitudinal compression and perpendicular tensile strength. When the acetic anhydride was associated with phtalic acid, most of the mechanical properties had a strength gain. The panels manufactured with acetylated flakes, treated with maleic and phtalic anhydrides, were also influenced by the type of solvent and reaction time, improving and/or making their physical and mechanical properties worse. On the whole, the panels presented satisfactory average values. Beyond this, for some mechanical tests, the results were well above the minimum values established by the standard, for most of the tests. This shows that these anhydrides present a great potential to be explored by the panel industries, requiring, however, more research.Atualmente, há uma luta incessante pela busca de novas tecnologias que viabilizem a utilização de vários tipos de matérias-primas, principalmente, resíduos, para a fabricação de produtos de boa qualidade que possam satisfazer as exigências do mercado consumidor. Desta forma, no mercado de painéis estruturais, aparecem os tipos OSB que são os concorrentes do compensado. Visando melhorar algumas das características dos painéis, o presente trabalho teve como objetivo mostrar a viabilidade técnica da utilização de flocos de madeira modificados quimicamente, a fim de melhorar a estabilidade dimensional dos painéis OSB. As espécies utilizadas neste trabalho foram do gênero Eucalyptus (Eucalyptus grandis) e do gênero Pinus (Pinus caribaea var. hondurenses), oriundas da cidade de Viçosa, Minas Gerais, com as respectivas densidades: 0,51 e 0,49 g/cm³. Os painéis de OSB, destas madeiras, foram fabricados a partir de flocos oriundos de tábuas e costaneiras, de dimensões 20,00 x 0,46 x 90,00 mm, e com valores de densidade pré-estabelecidos em 0,70 g/cm³). Os flocos foram classificados por tamanho em peneiras manuais. O adesivo utilizado para a confecção dos painéis OSB foi o fenol-formaldeído, empregado na proporção de 8% de sólidos em relação à massa seca de flocos. Os painéis tiveram em sua composição 50% de flocos não tratados e 50% de flocos esterificados pelos anidridos ftálico, maleico e acético. Como os dois xv primeiros anidridos eram sólidos, foi necessário solubilizá-los em solventes orgânicos, tais como álcool etílico e éter etílico, no caso do anidrido ftálico, e acetato de etila e acetona para o anidrido maleico. No caso do anidrido acético, foram empregados os ácidos acético e ftálico para catalisar a reação. Os painéis foram prensados à temperatura de 140°C e 32 kgf/cm² de pressão, e foram testados, segundo as normas da ABNT(NBR 14810-3) de 2002 e ASTM-D 1037 de 1991. Os resultados foram comparados utilizando-se as normas ANSI/A 208.1 (1993) e CSA 0437-93 (1993). Utilizou-se para a análise estatística o teste de médias e o Teste de Tukey, a um nível de 5% de significância. Os painéis que apresentaram as maiores médias para adsorção de vapor de água foram aqueles fabricados com flocos de Pinus caribaea, esterificados com anidrido maleico e acetona, durante 24 horas, enquanto que, os que apresentaram as menores médias foram aqueles confeccionados com flocos da espécie Eucalyptus grandis, tratados com anidrido acético e ácido acético durante 3 horas. Os painéis que apresentaram menor expansão linear foram aqueles fabricados com madeira da espécie Eucalyptus grandis, tratados com anidrido acético e ácido acético. Na absorção de água, durante 2 horas, os painéis que apresentaram as menores médias foram os fabricados com flocos de Eucalyptus grandis, esterificados por anidrido maleico com acetona por 48 horas. Na absorção de água, por 24 horas, os painéis que apresentaram os melhores resultados foram os fabricados com a espécie Pinus caribaea, esterificados com anidrido maleico, anidrido acético com ácido acético. As maiores médias de dureza Janka foram obtidas nos painéis confeccionados com flocos tratados com anidrido acético e ácido ftálico. Na tração perpendicular e compressão longitudinal, as menores médias foram dos painéis confeccionados com anidrido acético e ácido acético. As menores médias dos módulos de ruptura e elasticidade, sentido longitudinal, foram dos painéis confeccionados com anidrido acético e ácido acético. A acetilação empregandose o ácido acético influenciou de forma positiva a adsorção de vapor de água, inchamento em espessura e expansão linear nos painéis OSB, tornando os de flocos acetilados mais estáveis dimensionalmente. Contudo, houve uma perda de resistência nas propriedades mecânicas, tais como arrancamento de parafuso, compressão longitudinal e tração perpendicular. Quando o anidrido acético foi associado com ácido ftálico, a maioria das propriedades mecânicas tiveram um ganho na resistência. Os painéis fabricados com flocos acetilados, tratados com anidridos maleico e ftálico, também foram influenciados pelo tipo de solvente e tempo de reação, melhorando e/ou piorando suas propriedades físicas e mecânicas. De modo geral, os painéis apresentaram valores médios satisfatórios. Além disto, para alguns testes mecânicos, os resultados estavam bem acima dos valores mínimos estabelecidos pela norma, para a maioria dos ensaios. Isto mostra que estes anidridos apresentam um grande potencial a ser explorado pelas indústrias de painéis, havendo pois a necessidade de mais pesquisas.Conselho Nacional de Desenvolvimento Científico e Tecnológicoapplication/pdfporUniversidade Federal de ViçosaDoutorado em Ciência FlorestalUFVBRManejo Florestal; Meio Ambiente e Conservação da Natureza; Silvicultura; Tecnologia e Utilização deOSBEsterificaçãoEucaliptoPinusOSBEsterificationEucalyptusPinusCNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAISPropriedades de painéis OSB fabricados com flocos esterificadosProperties of OSB panels manufactured with esterified flakesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:LOCUS Repositório Institucional da UFVinstname:Universidade Federal de Viçosa (UFV)instacron:UFVORIGINALtexto completo.pdfapplication/pdf487769https://locus.ufv.br//bitstream/123456789/574/1/texto%20completo.pdfe331eca44b4b2b92fcced74c476cac3eMD51TEXTtexto completo.pdf.txttexto completo.pdf.txtExtracted texttext/plain186013https://locus.ufv.br//bitstream/123456789/574/2/texto%20completo.pdf.txt43b2cc554bf5614dfc2fc0fbf693ba1bMD52THUMBNAILtexto completo.pdf.jpgtexto completo.pdf.jpgIM Thumbnailimage/jpeg3697https://locus.ufv.br//bitstream/123456789/574/3/texto%20completo.pdf.jpgbac213b12de1b4b5e197e3344ab7a2b1MD53123456789/5742016-04-06 23:09:21.212oai:locus.ufv.br:123456789/574Repositório InstitucionalPUBhttps://www.locus.ufv.br/oai/requestfabiojreis@ufv.bropendoar:21452016-04-07T02:09:21LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)false
dc.title.por.fl_str_mv Propriedades de painéis OSB fabricados com flocos esterificados
dc.title.alternative.eng.fl_str_mv Properties of OSB panels manufactured with esterified flakes
title Propriedades de painéis OSB fabricados com flocos esterificados
spellingShingle Propriedades de painéis OSB fabricados com flocos esterificados
Cabral, Carla Priscilla Távora
OSB
Esterificação
Eucalipto
Pinus
OSB
Esterification
Eucalyptus
Pinus
CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS
title_short Propriedades de painéis OSB fabricados com flocos esterificados
title_full Propriedades de painéis OSB fabricados com flocos esterificados
title_fullStr Propriedades de painéis OSB fabricados com flocos esterificados
title_full_unstemmed Propriedades de painéis OSB fabricados com flocos esterificados
title_sort Propriedades de painéis OSB fabricados com flocos esterificados
author Cabral, Carla Priscilla Távora
author_facet Cabral, Carla Priscilla Távora
author_role author
dc.contributor.authorLattes.por.fl_str_mv http://lattes.cnpq.br/4588281790678445
dc.contributor.author.fl_str_mv Cabral, Carla Priscilla Távora
dc.contributor.advisor-co1.fl_str_mv Lucia, Ricardo Marius Della
dc.contributor.advisor-co1Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788298Z6
dc.contributor.advisor-co2.fl_str_mv Carneiro, Angélica de Cássia Oliveira
dc.contributor.advisor-co2Lattes.fl_str_mv http://lattes.cnpq.br/9474032258378987
dc.contributor.advisor1.fl_str_mv Vital, Benedito Rocha
dc.contributor.advisor1Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787473J6
dc.contributor.referee1.fl_str_mv Barcellos, Daniel Camara
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/6012920962189476
dc.contributor.referee2.fl_str_mv Carvalho, Ana Márcia Macedo Ladeira
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/6017392658993288
contributor_str_mv Lucia, Ricardo Marius Della
Carneiro, Angélica de Cássia Oliveira
Vital, Benedito Rocha
Barcellos, Daniel Camara
Carvalho, Ana Márcia Macedo Ladeira
dc.subject.por.fl_str_mv OSB
Esterificação
Eucalipto
Pinus
topic OSB
Esterificação
Eucalipto
Pinus
OSB
Esterification
Eucalyptus
Pinus
CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS
dc.subject.eng.fl_str_mv OSB
Esterification
Eucalyptus
Pinus
dc.subject.cnpq.fl_str_mv CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS
description There is at present an incessant struggle in the search for new technologies that enable the use of various types of raw materials, principally residues, in the manufacture of high quality products that could satisfy the demands of the consumer market. In the market of structural panels, there thus appear the types of OSB that compete with plywood. Aiming to improve some of the characteristics of the panels, the present work shows the technical viability of the use of wooden flakes when modified chemically, in order to improve the dimensional stability of OSB panels. The species used in this work were the genus Eucalyptus (Eucalyptus grandis) and the genus Pinus (Pinus caribeae var. hondurensis), originating from the city of Viçosa, Minas Gerais, with the respective densities: 0.51 and 0.49 g/cm ³. The OSB panels of these woods were manufactured from flakes originating from planks and boards, dimensions 20.00 x 0.46 x 90.00 mm, and with pre-established density values of 0.70 g/cm³). The flakes were classified by size in manual sieves. The adhesive used for the production of the OSB panels was phenol formaldehyde employed in the proportion of 8% of solids in relation to the dry mass of flakes. The panels had in their composition 50% untreated flakes and 50% flakes esterified by phtalic, maleic and acetic anhydrides. Since the first two anhydrides were solid, there was the need of solubilizing in organic solvents such as ethylic alcohol and ethyl ether for the phtalic anhydride, and ethyl acetate and acetone in the case of maleic anhydride. In case of the acetic anhydride, the acetic and phtalic acids were employed to catalyze the reaction. The panels were pressed at a temperature of 140°C and 32 kgf/cm² of pressure, and were tested according to the standards of the ABNT (NBR 14810-3) of 2002 and ASTM-D 1037 of 1991. The results were compared using the standards ANSI/A 208.1 (1993) and CSA 0437-93 (1993). For the statistical analysis the test of averages and the Tukey Test were used, at a level of significance of 5%. The panels that presented the highest averages for absorption of water vapor were those manufactured with flakes of Pinus caribeae, esterified with maleic anhydride and acetone, for 24 hours, whereas, those which presented the lowest averages were those made with flakes of the species Eucalyptus grandis, treated with acetic anhydride and acetic acid for 3 hours. For the linear expansion test, the panels that presented greater dimensional stability were those manufactured with wood of the species Eucalyptus grandis, treated with acetic anhydride and acetic acid. In the absorption of water within 2 hours, the panels that presented the lowest averages were those manufactured with flakes of Eucalyptus grandis, esterified by maleic anhydride with acetone for 48 hours. In the absorption of water for 24 hours, the panels that presented the best results were those manufactured with the species Pinus caribeae, esterified with maleic anhydride, acetic anhydride with acetic acid. For Janka hardness, the largest averages obtained were from the panels made with flakes treated with acetic anhydride and phtalic acid. In the perpendicular tensile strength and longitudinal compression, the lowest averages were for the panels made with acetic anhydride and acetic acid. For the moduli of rupture and elasticity, in the longitudinal sense, the lowest averages were also for the panels made with acetic anhydride and acetic acid. The acetylation employing acetic acid influenced in a positive way the following physical properties: adsorption of water vapor, expansion in thickness and linear expansion in the OSB panels, making those of acetylated flakes more dimensionally stable. Nevertheless, there was a loss of strength in mechanical properties such as screw withdrawal, longitudinal compression and perpendicular tensile strength. When the acetic anhydride was associated with phtalic acid, most of the mechanical properties had a strength gain. The panels manufactured with acetylated flakes, treated with maleic and phtalic anhydrides, were also influenced by the type of solvent and reaction time, improving and/or making their physical and mechanical properties worse. On the whole, the panels presented satisfactory average values. Beyond this, for some mechanical tests, the results were well above the minimum values established by the standard, for most of the tests. This shows that these anhydrides present a great potential to be explored by the panel industries, requiring, however, more research.
publishDate 2010
dc.date.issued.fl_str_mv 2010-05-07
dc.date.available.fl_str_mv 2013-12-16
2015-03-26T12:27:13Z
dc.date.accessioned.fl_str_mv 2015-03-26T12:27:13Z
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dc.identifier.citation.fl_str_mv CABRAL, Carla Priscilla Távora. Properties of OSB panels manufactured with esterified flakes. 2010. 138 f. Tese (Doutorado em Manejo Florestal; Meio Ambiente e Conservação da Natureza; Silvicultura; Tecnologia e Utilização de) - Universidade Federal de Viçosa, Viçosa, 2010.
dc.identifier.uri.fl_str_mv http://locus.ufv.br/handle/123456789/574
identifier_str_mv CABRAL, Carla Priscilla Távora. Properties of OSB panels manufactured with esterified flakes. 2010. 138 f. Tese (Doutorado em Manejo Florestal; Meio Ambiente e Conservação da Natureza; Silvicultura; Tecnologia e Utilização de) - Universidade Federal de Viçosa, Viçosa, 2010.
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