S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira
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| Data de Publicação: | 2020 |
| Tipo de documento: | Dissertação |
| Idioma: | por |
| Título da fonte: | Biblioteca Digital de Teses e Dissertações da UFRRJ |
| Texto Completo: | https://tede.ufrrj.br/jspui/handle/jspui/6297 |
Resumo: | Lignin is a by-product generated on a large scale in the wood pulping process and has currently been used to generate energy in the pulp mill itself. Due to its phenolic structure, it has been studied for several application purposes in different products on the market. An alternative to the use of this lignin has been to use phenolic adhesives for wood boards. However, due to the low reactivity of eucalypt kraft lignin with formaldehyde during the adhesive synthesis process, many studies have been carried out to improve this characteristic of lignin and thus obtain an adhesive with properties comparable to the current wood adhesives found on the market. Phenolation has been a promising methodology for increasing the reactivity of lignin. Based on this premise, this work aimed to phenolate an eucalypt kraft lignin for the synthesis and characterization of phenolic adhesives. Six lignin-phenol-formaldehyde adhesives samples were synthesized using phenolated and non-phenolated lignin in substitution proportions of 30%, 40% and 50% of the phenol, in addition it was prepared a control sample, in which there was no substitution of phenol by lignin. A commercial adhesive sample was also used in order to compare the results, totalizing eight treatments. For each treatment, a plywood was made under the same conditions (time, temperature, and pressure), and eight specimens were produced to perform the test of resistance of the glue line to shear strength. The phenolation process increased the reactivity of lignin kraft by 14.7%, with an increase in phenolic components in the lignin structure. The use of lignin had effects on the properties of the synthesized adhesives, both for non-phenolated lignin and for phenolated lignin. According to the results found, there was no statistical difference, at the 95% probability level in the Scott-Knott test, among the treatments for the test of resistance of the glue line to shear strength, except for the treatments with 30% substitution by phenolated lignin and non-phenolated. The other treatments met the minimum requirements for shear strength specified by the European standard EN 314-2 (1993). Kraft lignin has shown promise in the production of lignin-based bioproducts. It was possible to use kraft lignin to synthesize phenol formaldehyde adhesives in partial replacement to phenol. The adhesive with 50% of replacement with phenolated lignin was considered the best from the adhesives synthesized due to higher percentage of replacement and faster gel time. |
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Gomes, Fernando Jos? Borges064.999.456-81http://lattes.cnpq.br/0502504979310236Brito, Edv? Oliveira208.400.981-20Lelis, Roberto Carlos Costa497.049.906-34Gomes, Fernando Jos? BorgesSantos, Fernando AlmeidaLongue J?nior, DaltonBatalha, Larisse Aparecida Ribas086.921.466-76http://lattes.cnpq.br/0648250603620769Souza, Rafael Eloy de2023-01-31T18:20:38Z2020-02-18SOUZA, Rafael Eloy de. S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira. 2020. 40 f. Disserta??o (Mestrado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 2020.https://tede.ufrrj.br/jspui/handle/jspui/6297Lignin is a by-product generated on a large scale in the wood pulping process and has currently been used to generate energy in the pulp mill itself. Due to its phenolic structure, it has been studied for several application purposes in different products on the market. An alternative to the use of this lignin has been to use phenolic adhesives for wood boards. However, due to the low reactivity of eucalypt kraft lignin with formaldehyde during the adhesive synthesis process, many studies have been carried out to improve this characteristic of lignin and thus obtain an adhesive with properties comparable to the current wood adhesives found on the market. Phenolation has been a promising methodology for increasing the reactivity of lignin. Based on this premise, this work aimed to phenolate an eucalypt kraft lignin for the synthesis and characterization of phenolic adhesives. Six lignin-phenol-formaldehyde adhesives samples were synthesized using phenolated and non-phenolated lignin in substitution proportions of 30%, 40% and 50% of the phenol, in addition it was prepared a control sample, in which there was no substitution of phenol by lignin. A commercial adhesive sample was also used in order to compare the results, totalizing eight treatments. For each treatment, a plywood was made under the same conditions (time, temperature, and pressure), and eight specimens were produced to perform the test of resistance of the glue line to shear strength. The phenolation process increased the reactivity of lignin kraft by 14.7%, with an increase in phenolic components in the lignin structure. The use of lignin had effects on the properties of the synthesized adhesives, both for non-phenolated lignin and for phenolated lignin. According to the results found, there was no statistical difference, at the 95% probability level in the Scott-Knott test, among the treatments for the test of resistance of the glue line to shear strength, except for the treatments with 30% substitution by phenolated lignin and non-phenolated. The other treatments met the minimum requirements for shear strength specified by the European standard EN 314-2 (1993). Kraft lignin has shown promise in the production of lignin-based bioproducts. It was possible to use kraft lignin to synthesize phenol formaldehyde adhesives in partial replacement to phenol. The adhesive with 50% of replacement with phenolated lignin was considered the best from the adhesives synthesized due to higher percentage of replacement and faster gel time.A lignina ? um subproduto gerado em larga escala no processo de polpa??o da madeira e atualmente tem sido utilizada para gera??o de energia na pr?pria f?brica. Devido a sua estrutura fen?lica, ela vem sendo estudada para diversos fins de aplica??o em diferentes produtos no mercado. Uma alternativa para utiliza??o dessa lignina tem sido a de usos em adesivos fen?licos para pain?is de madeira. Por?m, devido a baixa reatividade da lignina kraft de eucalipto com o formalde?do durante o processo de s?ntese do adesivo, muitos estudos v?m sendo realizados para melhorar essa caracter?stica da lignina e assim obter um adesivo com propriedades comparativas aos atuais adesivos para madeiras encontrados no mercado. A fenola??o tem sido uma metodologia promissora para aumentar a reatividade da lignina. A partir dessa premissa, esse trabalho objetivou-se em fenolar a lignina kraft de eucalipto para s?ntese e caracteriza??o de adesivos fen?licos. Foram sintetizados seis adesivos lignina-fenol-formalde?do usando lignina fenolada e n?o fenolada em propor??es de substitui??o de 30%, 40% e 50% do fenol, e adicionalmente foi preparado uma amostra controle, em que n?o houve substitui??o do fenol por lignina. Utilizou-se tamb?m uma amostra de adesivo comercial a fim de compara??o dos resultados, totalizando oito tratamentos. Para cada tratamento foram confeccionados um painel compensado sob mesmas condi??es (tempo, temperatura e press?o) e produzidos oito corpos de prova para realiza??o do teste de resist?ncia da linha de cola ao esfor?o de cisalhamento. O processo de fenola??o aumentou em 14,7% a reatividade da lignina kraft, havendo incremento de componentes fen?licos nas estruturas da lignina. A utiliza??o de lignina teve efeitos nas propriedades dos adesivos sintetizados, tanto para os de lignina n?o fenolada, quanto para os de lignina fenolada. De acordo com os resultados encontrados, n?o houve diferen?a estat?stica, ao n?vel de 95% de probabilidade pelo teste de Scott-Knott, entre os tratamentos para o teste de resist?ncia da linha de cola ao esfor?o de cisalhamento, exceto pelos tratamentos com 30% de substitui??o por lignina fenolada e n?o fenolada, atendendo os requisitos m?nimos de resist?ncia ao cisalhamento especificado pela norma europeia EN 314-2 (1993). Foi poss?vel a utiliza??o da lignina kraft para s?ntese dos adesivos fenol formalde?do em substitui??o parcial ao fenol. O adesivo considerado melhor foi o de 50% de substitui??o de lignina fenolada devido a maior taxa de substitui??o e melhor tempo de forma??o de gel.Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2023-01-31T18:20:38Z No. of bitstreams: 1 2020 - Rafael Eloy de Souza.pdf: 1505766 bytes, checksum: 82eedd4cd4e486c28fe2d213061b27f5 (MD5)Made available in DSpace on 2023-01-31T18:20:38Z (GMT). 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| dc.title.por.fl_str_mv |
S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira |
| dc.title.alternative.eng.fl_str_mv |
Synthesis of lignin-phenol-formaldehyde adhesive for wood panels |
| title |
S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira |
| spellingShingle |
S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira Souza, Rafael Eloy de lignina kraft subproduto eucalipto fenola??o fenol formalde?do byproduct eucalyptus phenolation phenol formaldehyde kraft lignin Recursos Florestais e Engenharia Florestal |
| title_short |
S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira |
| title_full |
S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira |
| title_fullStr |
S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira |
| title_full_unstemmed |
S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira |
| title_sort |
S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira |
| author |
Souza, Rafael Eloy de |
| author_facet |
Souza, Rafael Eloy de |
| author_role |
author |
| dc.contributor.advisor1.fl_str_mv |
Gomes, Fernando Jos? Borges |
| dc.contributor.advisor1ID.fl_str_mv |
064.999.456-81 |
| dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0502504979310236 |
| dc.contributor.advisor-co1.fl_str_mv |
Brito, Edv? Oliveira |
| dc.contributor.advisor-co1ID.fl_str_mv |
208.400.981-20 |
| dc.contributor.advisor-co2.fl_str_mv |
Lelis, Roberto Carlos Costa |
| dc.contributor.advisor-co2ID.fl_str_mv |
497.049.906-34 |
| dc.contributor.referee1.fl_str_mv |
Gomes, Fernando Jos? Borges |
| dc.contributor.referee2.fl_str_mv |
Santos, Fernando Almeida |
| dc.contributor.referee3.fl_str_mv |
Longue J?nior, Dalton |
| dc.contributor.referee4.fl_str_mv |
Batalha, Larisse Aparecida Ribas |
| dc.contributor.authorID.fl_str_mv |
086.921.466-76 |
| dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/0648250603620769 |
| dc.contributor.author.fl_str_mv |
Souza, Rafael Eloy de |
| contributor_str_mv |
Gomes, Fernando Jos? Borges Brito, Edv? Oliveira Lelis, Roberto Carlos Costa Gomes, Fernando Jos? Borges Santos, Fernando Almeida Longue J?nior, Dalton Batalha, Larisse Aparecida Ribas |
| dc.subject.por.fl_str_mv |
lignina kraft subproduto eucalipto fenola??o fenol formalde?do byproduct eucalyptus phenolation phenol formaldehyde |
| topic |
lignina kraft subproduto eucalipto fenola??o fenol formalde?do byproduct eucalyptus phenolation phenol formaldehyde kraft lignin Recursos Florestais e Engenharia Florestal |
| dc.subject.eng.fl_str_mv |
kraft lignin |
| dc.subject.cnpq.fl_str_mv |
Recursos Florestais e Engenharia Florestal |
| description |
Lignin is a by-product generated on a large scale in the wood pulping process and has currently been used to generate energy in the pulp mill itself. Due to its phenolic structure, it has been studied for several application purposes in different products on the market. An alternative to the use of this lignin has been to use phenolic adhesives for wood boards. However, due to the low reactivity of eucalypt kraft lignin with formaldehyde during the adhesive synthesis process, many studies have been carried out to improve this characteristic of lignin and thus obtain an adhesive with properties comparable to the current wood adhesives found on the market. Phenolation has been a promising methodology for increasing the reactivity of lignin. Based on this premise, this work aimed to phenolate an eucalypt kraft lignin for the synthesis and characterization of phenolic adhesives. Six lignin-phenol-formaldehyde adhesives samples were synthesized using phenolated and non-phenolated lignin in substitution proportions of 30%, 40% and 50% of the phenol, in addition it was prepared a control sample, in which there was no substitution of phenol by lignin. A commercial adhesive sample was also used in order to compare the results, totalizing eight treatments. For each treatment, a plywood was made under the same conditions (time, temperature, and pressure), and eight specimens were produced to perform the test of resistance of the glue line to shear strength. The phenolation process increased the reactivity of lignin kraft by 14.7%, with an increase in phenolic components in the lignin structure. The use of lignin had effects on the properties of the synthesized adhesives, both for non-phenolated lignin and for phenolated lignin. According to the results found, there was no statistical difference, at the 95% probability level in the Scott-Knott test, among the treatments for the test of resistance of the glue line to shear strength, except for the treatments with 30% substitution by phenolated lignin and non-phenolated. The other treatments met the minimum requirements for shear strength specified by the European standard EN 314-2 (1993). Kraft lignin has shown promise in the production of lignin-based bioproducts. It was possible to use kraft lignin to synthesize phenol formaldehyde adhesives in partial replacement to phenol. The adhesive with 50% of replacement with phenolated lignin was considered the best from the adhesives synthesized due to higher percentage of replacement and faster gel time. |
| publishDate |
2020 |
| dc.date.issued.fl_str_mv |
2020-02-18 |
| dc.date.accessioned.fl_str_mv |
2023-01-31T18:20:38Z |
| dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
| dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
| format |
masterThesis |
| status_str |
publishedVersion |
| dc.identifier.citation.fl_str_mv |
SOUZA, Rafael Eloy de. S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira. 2020. 40 f. Disserta??o (Mestrado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 2020. |
| dc.identifier.uri.fl_str_mv |
https://tede.ufrrj.br/jspui/handle/jspui/6297 |
| identifier_str_mv |
SOUZA, Rafael Eloy de. S?ntese de adesivo lignina-fenol-formalde?do para pain?is de madeira. 2020. 40 f. Disserta??o (Mestrado em Ci?ncias Ambientais e Florestais) - Instituto de Florestas, Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 2020. |
| url |
https://tede.ufrrj.br/jspui/handle/jspui/6297 |
| dc.language.iso.fl_str_mv |
por |
| language |
por |
| dc.relation.references.por.fl_str_mv |
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