Avaliação de diferentes resóis fenólicos comerciais na colagem de painéis de compensado
Phenolic resins are the result of the polycondensation reaction in phenol and formaldehyde. This category of resins is divided into two groups: novolac and resole. Resole resins show several interesting characteristics when applied into the production of plywood panels, mainly due to their excellent...
| Autor principal: | Casagranda, Lucas |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2023
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/30795 |
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| Resumo: |
Phenolic resins are the result of the polycondensation reaction in phenol and formaldehyde. This category of resins is divided into two groups: novolac and resole. Resole resins show several interesting characteristics when applied into the production of plywood panels, mainly due to their excellent resistance to heat and humidity. Moreover, they have great adhesion strength to wood fibers as well as the characteristic of curing through heat. The manufacturing process for plywood panels can vary greatly, and thus, characterizing and testing different resins in various application scenarios will help us to understand which resin is best suited for each production process. For this, the physical-chemical characterization test of each resin was carried out, followed by the construction of plywood panels using the three resins, using pre-determined variations in weight, and assembling process. From these panels, specimens were made within the current standards for shear rupture tests. The specimens were subjected into stress by vacuum-pressure or boiling, and afterwards, broken for the evaluation of visual fibers and maximum stress before breaking. The test results were compiled in graphs and spreadsheets to measure the bonding behavior in each of the scenarios, in addition to describing which resin behaved better. The results showed performance variations of the resins depending on the test scenario, which can better qualify each one of them depending on its use mode. Resin A showed better results in shorter assembly times (up to 4 h), with a drop in performance after that time. Resin B had a similar behavior to resin B, but with a better performance when a higher weight of adhesive was used in the bonding. Resin C, on the other hand, had a more homogeneous bonding behavior regardless of the assembly time, which makes this resin support greater process variations. The study was carried out in a controlled environment, which does not reproduce all the variables of a production on a commercial scale. Tests using a wider range of variations can show results with greater scientific results, thus better characterizing the behavior of each resin. |
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