Abstract
The legislation pertaining to air pollution has led the paint and coating industries to develop ways to reduce the volatile organic content (VOC) of the solvent-borne coatings without compromising the film performance and application characteristics. This resulted in the emergence of solvent-free alkyd coatings which are the most potential solutions to reduce environmental problems. In the present work, hydroxyl functional castor alkyd (CA) was synthesized using a solvent-free process and cured with Melamine Formaldehyde (MF) resin. Structures of the formed product were confirmed by Fourier Transform Infrared (FTIR) spectroscopy and 1H and 13C Nuclear Magnetic Resonance (NMR) analysis. Thermal properties of the cured film samples were determined using Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) analysis which showed that Tg and degradation temperature values increased as the amount of MF increased. Also, the corrosion performance of the coating films was studied by using a salt spray test which revealed that the best corrosion resistance was shown by 70:30 ratio of MF: CA. All the results including mechanical properties of the coating film showed that the eminent role was played by the MF in the performance of CA.
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