s-Triazine Ring-Modified Waterborne Alkyd: Synthesis, Characterization, Antibacterial, and Electrochemical Corrosion Studies

Abstract

The surface coating industry is globally involved in developing useful, eco-friendly, and VOC (volatile organic compounds)-free coating systems, which exhibit promising physico-mechanical and corrosion protective performance. Herein, we report the synthesis of butylated melamine formaldehyde (BMF)-modified soy alkyd (SA-BMF). The structural elucidation and molecular weight of soy alkyd (SA) and SA-BMF resin was carried out by FT-IR, 1 H NMR, and 13 C NMR spectroscopy and gel permeation chromatography (GPC) techniques. The physico-chemical and physico-mechanical properties were tested by standard protocols. Initial decomposition temperature was measured by thermogravimetric analysis (TGA). The curing study and glass transition temperature were assessed by differential scanning calorimetry (DSC). Hydrophobicity of the coatings was measured in terms of contact angle. The anticorrosion performance of SA-BMF was studied experimentally using polarization techniques and electrochemical impedance spectroscopy (EIS), while the antimicrobial efficacy of the same were tested against Gram positive bacterium Staphylococcus aureus (S. aureus) and Gram negative bacterium Escherichia coli (E. coli) by the agar diffusion method. Overall, our studies revealed that the waterborne SA-BMF coating exhibited higher scratch resistance, impact resistance (150 lb/in.), and bend tests (flexibility retentive 1/8 in.), along with good antibacterial activity and anticorrosive performance. These coatings also find safe usage up to 200°C.

Effect of surface modified TiO2 nanoparticles on thermal, barrier and mechanical properties of long oil alkyd resin-based coatings

“…Alkyd resins based on non-toxic, biodegradable, multifunctional, low cost, physically and chemically stable and eco-friendly renewable resources such as vegetable oils show properties comparable with properties of products based on petroleum, and therefore have found their industrial application in paints and surface coatings [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Especially interesting low cost vegetable oil is soy bean oil, which has balanced composition of unsaturated and saturated fatty acids and it can reduce yellowing and oxidative degradation of resin [2,[16][17][18][19]. Araujo et al [16] have shown that anticorrosive properties of alkyd paints prepared with soy bean oil are similar to the anticorrosive properties of alkyd resins synthesized using linseed oil, but water vapor and ions permeability in freestanding film, as well as adhesion loss, depend on the type of pigment and vegetable oil used in the formulation of alkyd resins.…”

Linseed oil polyol/ZnO bionanocomposite towards mechanically robust, thermally stable, hydrophobic coatings: a novel synergistic approach utilising a sustainable resource

“…7,50,51 Characterisation Physicochemical properties of the resins such as iodine value, refractive index, specic gravity and inherent viscosity were determined by standard test methods (Table 1). The specimens were washed thoroughly with double distilled water, degreased with methanol and acetone, and dried at room temperature.…”

“…Deionized water was used for the evaluation of the hydrophobic properties of the coated substrate. 7,50,51,53,54 The working electrode was rst maintained in a test environment for 30 min before the impedance run. The angle measurements were done in triplicate.…”

Bio‐based epoxy/polyaniline nanofiber‐carbon dot nanocomposites as advanced anticorrosive materials

“…Another nanomaterial, which is currently utilized as anticorrosive material, is the carbon dot (CD). CDs are the fluorescent class of nanomaterials consisting of several oxygenous groups having size below 10 nm . CD has been extensively explored due to its unique set of properties like excellent photocatalytic activity, low toxicity, and good biocompatibility .…”