Fabricação e caracterização de revestimentos a base de resina epóxi com agentes de cargas comerciais

Abstract

Epoxy resins are polymeric thermosets used for a long time in several areas of engineering. Due to its brittleness, its use is somewhat restricted and several studies are underway to improve its mechanical properties. Particulate products such as pigments have as their primary task change the color, but in many circumstances they can also improve the matrix in which they are inserted, improving is mechanical strength and protecting it against atmospheric influence. In this work we will use a particulate product which possesses on its formulation not only pigments but also reinforcement materials. This particular type of particulate material is commercially available under the fantasy name of PóXadrez and is produced by LANXESS. We chose to study the red and blue versions. The powder was analised by x-ray fluorescence and the results indicate clearly the presence of not only pigments but also reinforcement agents. The mechanical essays, such as stress and flexion, indicated a decrease of the rupture stress of both essays when compared to the pure resin. However, surprisingly, the Young modulus has increased in the flexion essays. Scanning Electron Miscroscopy analysis indicated an homogeneous incorporation of the red pigment whereas the blue pigment tended to agglomerate. Raman Spectroscopy analysis indicated that the vibrational spectrum of the epoxy resin was not changed upon introduction of the pigments.