Alkyd hybrid coatings for electrical rotating machines

Alkyd hybrid systems containing antioxidants (IRGANOX 1010, IRGANOX 1076, and SANTONOX R), titania and alumina were subjected to thermal and radiation degradation for their application in the electrical engineering. For the characterization of thermal stability of hybrid compositions, crystallinity evolution in nanostructured organic polymers, and structure changes, due to different thermal treatment isothermal and nonisothermal chemiluminescence, X-ray diffraction, infrared absorption spectroscopy with Fourier transforming infrared spectrometer and Raman spectroscopy were, respectively, used. It was found that the oxidation protector IRGANOX 1010 and TiO2 filler increased the thermal stability proved by chemiluminescence. The long-term heating characterized by temperature index demonstrated that the modified alkyd–melamine–epoxy resin is a suitable treatment for polyester laminates used in the electrical rotating machines. The superior thermal performances of cured polyester laminates were also demonstrated by the evaluation of swelling degree that is placed at half or lower values in modified materials than in neat resin. The interaction between formulation components is revealed by the improvement of thermal strength whose level is increased due to the cage effects promoted by additive and filler.