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Percorrer por autor "Atencio, Soraya"

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  • Improving paint characteristics
    Publication . Atencio, Soraya; Rosa, Sérgio; Dias, Ricardo P.; Cuenca, Pamela
    In this work, the rheological properties of coatings, produced by the company “Tintas Europa”, were studied and compared with the coating of a competitor company, in order to improve their characteristics. The company approached to the IPB with a problem to be “solved”; they wanted to know the reason why costumers prefer the competitor coating instead of theirs, assuming they are sold as identical products and therefore should have the same reception. Based on this premise the following objectives were established: evaluate the rheological properties of the paint samples that were provided; investigate the properties of ideal paints; modify the components of the samples to alter their rheological properties; study the effect of modifications on the rheological properties of paints To achieve the proposed objectives, experimental tests were carried out. Six samples were tested, including the competitor's sample, Newplaste and Supramate, which are paints that are currently sold by the company, and three Supramate modifications named A, C and D, with different percentages of thickeners in their composition. All tests were performed with a rheometer that allowed to know the main rheological differences between paintings. Those tests were: Viscosity curve, Amplitude Sweep, Frequency Sweep and Three-Interval-Thixotropy-Test (3ITT). It was found that the samples had similarities in their viscous and elastic behaviors, but a difference in thixotropy behaviors was found. Finally, the sample that, rheologically, most closely resembled the competitor's sample, and is expected to have a similar behavior in practice, was sample A that was a modified coating, and had the least percentage of thickener in its composition.
    2021Dissertação de mestrado Acesso aberto Ver mais