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Item type:Publication, Effect of polyalcohols on the anticorrosive behaviour of alkyd coatings prepared with drying oils(Elsevier, 2020-08-01)Alkyd paints contain resins derived from vegetable oils. Alkyd resins have regained their importance since they are mostly composed of bio-based constituents recovered from biofuels production and agro-industrial waste. The anticorrosive performance of medium alkyd paints modified with Sacha inchi and linseed oils, and different ratios of glycerol and pentaerythritol, were compared by accelerated corrosion tests (Salt Fog and Sulphur Dioxide tests). This study focuses on comparing the effect of polyalcohol and oil type on physicochemical properties of resin solutions and cured films, and consequently, on the anticorrosive behaviour of paints prepared with the resins under study. Results showed that the mixture of pentaerythritol and Sacha inchi oil improves alkyd resin properties and enhance the anticorrosive performance of alkyd paints in accelerated weathering tests. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, NMR and GPC Analysis of Alkyd Resins: Influence of Synthesis Method, Vegetable Oil and Polyol Content(MDPI, 2023-05-01)Alkyd resins are oil-based polymers that have been widely used for generations in the surface coating industry and beyond. Characterization of these resins is of high importance to understand the influence of its components on its behavior, compatibility with other resins, and final quality to ensure high durability. Here, NMR spectroscopy and GPC were used for characterizing differences in the chemical structure, molecular distribution, and dispersity between oil-based and fatty acid-based alkyd polymers made from sacha inchi and linseed oils. Sancha inchi (Plukentia volubilis L.) is a fruit-bearing plant native to South America and the Caribbean, and has a rich unsaturated fatty acid content. The effect of vegetable oil and polyol selection on the synthesis of alkyd resins for coating applications was analyzed. The influence of two different synthesis methods, monoglyceride and fatty acid processes, was also compared. Important structural differences were observed using NMR: one-dimensional spectra revealed the degree of unsaturated fatty acid chains along the polyester backbone, whereas, 2D NMR experiments facilitated chemical shift assignments of all signals. GPC analysis suggested that alkyd resins with homogeneous and high molecular weights can be obtained with the fatty acid process, and that resins containing pentaerythritol may have uniform chain lengths. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Microwave-assisted modification of a solid epoxy resin with a Peruvian oil(Elsevier BV, 2025-09-01)A solid epoxy resin was modified with drying vegetable oils via microwave heating to produce one-component epoxy ester resins. These hybrid bio-based resins have an epoxy network that cures at room temperature due to the auto-oxidative capacity of unsaturated fatty acid chains. The influence of the fatty acid source, temperature, and reaction time on viscosity was evaluated using a response surface design. Structure (Fourier transform infrared (FTIR) spectroscopy and proton nuclear magnetic resonance ( 1 H NMR)), drying behavior, thermal stability (thermogravimetry/ differential thermal analysis (TG/DTG)), and molecular weight distribution (gel permeation chromatography (GPC)) of selected resins were also studied. Paints prepared with representative epoxy ester resins were analyzed to compare the effect of the fatty acid source on anticorrosive properties by electrochemical impedance and salt spray tests. The design of experiments simplified the selection of synthesis conditions to obtain optimal resin film properties. Microwaved-synthesized epoxy ester resins prepared with Peruvian oil are potential raw materials for developing functional anticorrosive paints, as they provide the best corrosion resistance . Its high unsaturation content gives sacha inchi oil the curing properties needed to replace linseed oil in the coatings industry .1