Contribuição ao estudo de revestimentos para pisos: correlação entre parâmetros de formação e propriedades de filmes a base de resinas acrílicas

• Ano de defesa: 2010
• Autor(a) principal: Keila Cristina de Faria Borges
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: engenharia química; Engenharia quimica
• Link de acesso: http://hdl.handle.net/1843/BUOS-8M5HS4

In this work, the formulation of polymeric resins coatings, based on acrylic resins was studied. The study involved the evaluation of the effect of two components, a solvent (ethyldiglicol EDG) and a plasticizer (tributoxyethylphosphate TBEP) on three important properties of films used as floor coatings: brightness, stiffness and film quality. Statisticaldesign of experiments was used as a tool for the proposed study, with the aid of the software MINITAB. The statistical planning was conducted in four steps, including the factorial planning with a 2k matrix, being k = 2, with preliminary experiments, the response surface design, the steepest ascent method and the conjugated analysis. The studied variables(EDG and TBEP) had, initially, their values fixed in maximum and minimum values, based on the analysis of the commercial formulations available for the type of coating studied. For EDG, the minimum was fixed at 0.5%w/w and the maximum at 7.2%w/w. For TBEP, the minimum was fixed at 1.5%w/w and the maximum at 7.2%w/w. The obtained results allowed the qualitative and quantitative effect of the studied parameters on the selected responsevariables. The proposed model for the response-variable brightness was validated, with experimental results very close to the theoretical ones, predicted by the model. While theplasticizer TBEP presents a significant in the stiffness of the prepared resins, the solvent EDG, as well as the solvent / plasticizer interaction, showed a significant influence in the brightness of the resins. The influence of all studied parameters in the quality of the film wasstudied. The optimal composition for the resins, for the studied formulations, with respect to the variables brightness, stiffness and film quality, was determined, being equal to 1.5%w/w of TBEP and 7.6%w/w of EDG. The film obtained at this composition was transparent, flexible, homogeneous, with no fish eyes (points with surface tension variation) and no dust points.