Development of hyperbranched polyester polyol-based waterborne anticorrosive coating / Ashish Pratap Singh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 1 (01/2016) . - p. 41-51 Titre : Development of hyperbranched polyester polyol-based waterborne anticorrosive coating Type de document : texte imprimé Auteurs : Ashish Pratap Singh, Auteur ; C. Suryanarayana, Auteur ; R. Baloji Naik, Auteur ; G. Gunasekaran, Auteur Année de publication : 2016 Article en page(s) : p. 41-51 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Anticorrosion Métaux -- Revêtements protecteurs Polyesters Polymères ramifiés Polyols Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Water-soluble hydroxyl functionalized hyperbranched polyester (WH-HP) resin was synthesized using pentaerythritol, pyromellitic dianhydride, phthalic anhydride, and 1,1,1-tris(hydroxymethyl)propane. The synthesized WH-HP was characterized by spectroscopic (FTIR and NMR) as well as thermal (TGA and DSC) analysis. WH-HP and hexa methoxy methyl melamine (HMMM) resins were mixed in different mole ratios (1:2.5, 1:5, 1:7.5, and 1:10), coated on mild steel panel, and cured by baking at 110°C for 1 h. These coating compositions were evaluated for their mechanical and anticorrosive properties. It was observed that coating composition having 1:5 mol ratio (WH-HP:HMMM) has shown very good mechanical and anticorrosive properties compared to the rest. Note de contenu : - MATERIALS AND EXPERIMENTAL METHODS : Materials - Synthesis of polyester polyol (PP) - Synthesis of carboxyl-functionalized hyperbranched polyester (C-HP) - Synthesis of water-soluble hydroxyl-functionalized hyperbranched polyester resin (WH-HP) - Preparation of coating compositions - CHARACTERIZATION : Acid value - Characterization of resins - Gel content - Gel permeation chromatography (GPC) analysis - Particle size analysis - Resistance in corrosion under different exposure conditions - Electrochemical impedance spectroscopy (EIS) - RESULTS AND DISCUSSION : FTIR analysis - 1H and 13C NMR analysis - Thermal properties of films - Gel permeation chromatography (GPC) analysis - Gel content - Particle size distribution of WH-HP polymer - Mechanical properties - Solvent resistance - Anticorrosive properties DOI : 10.1007/s11998-015-9720-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9720-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25370 [article]

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Effect of three structurally different epoxy resins on fire resistance, optical transparency, and physicomechanical properties of intumescent fire-retardant transparent coatings / Raj Shree in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 535–547 Titre : Effect of three structurally different epoxy resins on fire resistance, optical transparency, and physicomechanical properties of intumescent fire-retardant transparent coatings Type de document : texte imprimé Auteurs : Raj Shree, Auteur ; R. Baloji Naik, Auteur ; Rupesh S. Naik, Auteur ; G. Gunasekaran, Auteur Année de publication : 2021 Article en page(s) : p. 535–547 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Charbon, Cendres de Composés organiques -- Synthèse Epoxydes Essais de comportement au feu Fourier, Spectroscopie infrarouge à transformée de Gommes et résines Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Phosphates Polyphosphorique, Acide Revêtements -- Propriétés mécaniques Revêtements -- Propriétés physiques Revêtements organiques Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Transparent intumescent fire-retardant (IFR) coatings are the newest passive fireproofing materials which maintain structural integrity without losing aesthetic appearance of the substrate. In this present paper, effects of three IFR coatings with structurally different epoxy resins, namely aliphatic, cycloaliphatic, and aromatic, on the fire resistance, transparency, and physicomechanical properties were investigated. Different phosphate resin acids (PRA) were prepared by reacting synthesized phosphate ester acid (PEA) with aliphatic, cycloaliphatic, and aromatic epoxy resins. The chemical structures of the above PEA and PRAs were confirmed by Fourier transform infrared spectroscopy (FTIR), 1H-nuclear magnetic resonance spectroscopy (1H-NMR), and 31P-nuclear magnetic resonance spectroscopy (31P-NMR). Subsequently, transparent IFR coatings were prepared by mixing these PRAs with hexamethoxy methyl melamine resin. Transparency of the coatings was confirmed by UV–Vis–NIR spectrophotometeric studies. Fire protection property and char compressive strength were done to investigate the fire protection ability of the coatings, and the quality of the char formed was analyzed by field emission scanning electron microscope. The decomposition process of prepared fire-retardant coatings was studied by thermogravimetric analysis. Results showed that aliphatic epoxy-based transparent coating produced tough and compact char, but the char height was negligible, and aromatic epoxy-based transparent coating produced soft and fluffy char having excellent char height; however, the fluffy char reduced protection for longer duration. Cycloaliphatic epoxy-based transparent coating produced tough and compact char with good char height, thereby reducing heat transfer during combustion, and also showed superior scratch, abrasion, impact, and water resistance compared to other compositions. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of phosphate resin acid (PRA) - Preparation of coating sample - CHARACTERIZATION : Characterization of prepared resins - Characterization of transparent coatings - Characterization of char formed - RESULTS AND DISCUSSION : Thermogravimetric analysis (TGA) - Transparency of coating prepared using PRAs - Physicomechanical properties of transparent IR coatings - Fire resistant test - Characterization of char - Table 1 : Composition and acid value of prepared resins - Table 2 : Physicomechanical performance of all PRAs - Table 3 : Elemental composition of char obtained from the EDAX analysis DOI : https://doi.org/10.1007/s11998-020-00422-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00422-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35613 [article]

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Hyperbranched polyurethane based high-solid protective coating for marine application / R. Baloji Naik in PAINTINDIA, Vol. LXVIII, N° 12 (12/2018)  

[article]  inPAINTINDIA > Vol. LXVIII, N° 12 (12/2018) . - p. 53-66 Titre : Hyperbranched polyurethane based high-solid protective coating for marine application Type de document : texte imprimé Auteurs : R. Baloji Naik, Auteur ; G. Gunasekaran, Auteur ; D. Ratna, Auteur Année de publication : 2018 Article en page(s) : p. 53-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Anticorrosifs Anticorrosion Essais accélérés (technologie) Essais dynamiques Formulation (Génie chimique) Haut extrait sec Marines (peinture) Pigments inorganiques Polymères ramifiés Polyuréthanes Résistance aux conditions climatiques Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements antisalissures:Peinture antisalissures Revêtements bi-composant:Peinture bi-composant Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : High-solid two-pack paint formulations based on hyperbranched alkyd polyol (HBA) and isocyanate curing agents were developed for high performance exterior coating application. The base component consists of a hyperbranched alkyd polyol (HBA) resin and a mixture of pigments like titanium dioxide, yellow iron oxide, carbon black and talc. The pigments were dispersed in the HBA resin using a ball milI for a period of 6 - 7 h. The base component is then cured separatly with two different types of isocyanate curing agents such as aliphatic isocyanate (Desmodur N3390) and cycloaliphatic isocyanate (Desmodur Z4470). These experimental paint compositions were applied on mild steel specimens coated with epoxy red oxide primer (two coats of primer and two coats of exterior grey paint). The coating systems were evaluated for adhesion, tensile, corrosion and weathering resistance properties. For comparison, specimens of the conventional (silicone alkyd) paint was also prepared and tested. Results indicate that the developed coating composition have superior mechanical, corrosion resistance and weathering resistance properties compared to the conventional silicone alkyd coating. Note de contenu : - EXPERIMENTAL : Materials - Design of HBUA based high solid paint formulations - Mechanical properties - Adhesion strength - Evaluation of resistance to accelerated weathering - Evaluation of corrosion resistance property under different exposure conditions - Electrochemical impedance spectroscopy (EIS) - RESULTS AND DISCUSSION : Physical properties - Mechanical properties - Abrasion, scratch, impact resistance and flexibility tests - Adhesion strength - Accelerated weathering test - Accelerated corrosion test - Electrochemical impedance spectroscopy En ligne : https://drive.google.com/file/d/1bTS6N1nH82_lqCplbUj3uv8mXD11kQXi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31933 [article]

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Phytic acid based novel optically transparent intumescent fire-retardant coating for protection of combustible substrates with retention of aesthetic appearance / Raj Shree in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 509-525 Titre : Phytic acid based novel optically transparent intumescent fire-retardant coating for protection of combustible substrates with retention of aesthetic appearance Type de document : texte imprimé Auteurs : Raj Shree, Auteur ; R. Baloji Naik, Auteur ; G. Gunasekaran, Auteur Année de publication : 2022 Article en page(s) : p. 509-525 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Composés organiques -- Synthèse Ester de phosphate Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Phytique, Acide Polymères ramifiés Polyols Revêtements -- Propriétés mécaniques Revêtements -- Propriétés physiques Revêtements organiques Revêtements protecteurs Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Phosphorus source in transparent intumescent fire-retardant (IFR) coatings plays a crucial role in determining its performance against protecting structures from fire. In the present work, naturally occurring environmentally benign phosphorus-rich phytic acid (PA) was used as a phosphorus source. Phosphate ester resin (PER) was synthesized using PA and hyperbranched polyol (HBP), which was then used as a precursor for preparing optically transparent IFR coatings. The prepared PER was further modified with hydrogenated bisphenol-A (DGEHBA)-based epoxy resin in different wt% (25–100) to get PER-1, PER-2, PER-3, and PER-4, respectively. The formation of the PER resins was confirmed by Fourier transform infrared spectroscopy (FTIR), 13C-nuclear magnetic resonance, 31P-nuclear magnetic resonance spectroscopy (31P-NMR), and acid value analysis. The transparent IFR coatings were prepared by suitably mixing PER with hexamethoxy methyl melamine (HMMM) resin, and their performance was studied by measuring mechanical properties, optical transparency, thermal stability, fire retardancy, and smoke emission characteristics using various analytical instruments. The combination of PA and hyperbranched polyol improved the physicomechanical properties of PER-based transparent IFR coatings. The char formed after burning was also analyzed using FESEM and UTM. Results revealed that phytic acid and HBP combination increased the height as well as strength of the char. Among the prepared transparent IFR coatings, PER-0 and PER-1 have shown higher char height and strength. Note de contenu : - EXPERIMENTAL : Materials - Synthesis and modification of phosphate ester resin (PER) - Preparation of transparent IFR coating - CHARACTERIZATION - RESULTS AND DISCUSSION : Characterization of synthesized resins - Transparency characterization - Physicomechanical properties of the coatings - Characterization of char - Table 1 : Composition of different PER resins - Table 2 : Assignment of the peaks in FTIR spectra of raw materials and the synthesized resins - Table 3 : Physicomechanical properties of the transparent IFR coating - Table 4 : TGA data of the transparent IFR coatings - Table 5 : Fire-retardant properties of transparent IFR coatings DOI : https://doi.org/10.1007/s11998-021-00537-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00537-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37284 [article]

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