Hydrophobic phytic acid conversion layers for corrosion protection of steel surfaces / Michelle Weinert in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 703-736 Titre : Hydrophobic phytic acid conversion layers for corrosion protection of steel surfaces Type de document : texte imprimé Auteurs : Michelle Weinert, Auteur ; Jochen S. Gutmann, Auteur ; Michael Dornbusch, Auteur Année de publication : 2024 Article en page(s) : p. 703-736 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. Anticorrosifs Anticorrosion Caractérisation Esterification Métaux -- Revêtements protecteurs Phytique, Acide Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Revêtement de conversion Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The possibility for a good conversion protection based on phytic acid (PA) solutions is described many times in the literature.1,2 The latest results show that PA cannot improve the corrosion protective properties with an organic coating,2 although PA conversion layers without organic coatings have already successfully been applied on different surfaces and the development of layers with enhanced corrosion protective behavior was possible.3,4 The reason why PA does not work together with an organic coating is based on the hydrophilic surface and therefore the low contact angle of the PA conversion layer.2 One solution is to modify PA directly and/or change the solution properties to increase the hydrophobic properties. In this work, a new and innovative way to synthesize a new type of sustainable organic PA-based conversion layers on steel, which works completely without titanium or zirconium and is a new approach for hydrophobic conversion layers, is presented.5 The results prove the formation of a pure PA-based conversion layer on the surface. The infrared (IR), Raman, and nuclear magnetic resonance (NMR) spectroscopy verified the new synthesis products and by means of the vibration spectroscopy, the resulting conversion layers. To analyze the new physical properties, the contact angle of the conversion layers was detected. By means of the electrochemical impedance spectroscopy (EIS), the electrochemical stability of the conversion was studied and with cyclic voltammetry (CV), the solidity ratio was investigated. At last, the corrosion protective performance of the layers in combination with an E-coat in the salt spray test (SST) was examined. All modified PA-based conversion layers in combination with E-coats increased the corrosion protective properties in relation to industrial used phosphate conversion layers of steel surfaces. The overall result is a new kind of hydrophobic phytic acid-based conversion layer which shows advanced anticorrosion and coatability properties compared to other layers based on PA. The results if the EIS measurements show that the resistance of the coating significantly increased, and diffusion could be suppressed by coating the metal surface with PA conversion layers. The comparison of the SST results for the reference and the modified PA underline these observations. The overall SST rating increased by 2 and the delamination went down to 1.9 mm while the corrosion was 0.1, comparable to phosphated steel. Note de contenu : - CHARACTERIZATION AND MATERIALS : Characterization - Materials and modified PA structures - EXPERIMENTAL METHODS : Synthesis - Formation of a conversion layer - CONVERSION LAYERS WITH CATHODIC DIP COATING : Two-layer system - RESULTS AND DISCUSSION : Characterization of the conversion layer DOI : https://doi.org/10.1007/s11998-023-00852-w En ligne : https://drive.google.com/file/d/1YNEaZvyqrncDo6RPuyTAXXJ2cSNOz7MK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40787 [article]

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Multifunctionals empowered - Part 1 / Balint Koroskenyi in SOFW JOURNAL, Vol. 149, N° 12 (12/2023)  

[article]  inSOFW JOURNAL > Vol. 149, N° 12 (12/2023) . - p. 34-42 Titre : Multifunctionals empowered - Part 1 Type de document : texte imprimé Auteurs : Balint Koroskenyi, Auteur ; Jasmin Salmen, Auteur ; Maria Teresa Fontan Yanes, Auteur Année de publication : 2023 Article en page(s) : p. 34-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides organiques Antimicrobiens Cosmétiques -- Aspect sanitaire Emulsions -- Emploi en cosmétologie Matériaux -- Propriétés barrières Matériaux -- Propriétés fonctionnelles Microbiologie pH Phytique, Acide Index. décimale : 668.5 Parfums et cosmétiques Résumé : Symshield®, also known as barrier technology or hurdle technology, is a concept of combining several physical or chemical factors aiming at inhibiting microbial growth. This systematic approach has been proven successful as it strengthens the microbiological product protection systems of cosmetic formulations, thus ensuring long-term product quality and safety. Relying on this technology, multifunctional ingredients are often used in combination with preservatives or other antimicrobial enhancers and are commonly applied as part of the product protection system. While typically chemical ingredients are used as barriers in these combinations such as organic acids, chelating agents, surfactants, etc., it is important not to overlook the possible beneficial effects of physical parameters. Ultimately, this extensive approach has the potential to create a more robust product protection system or even lower the necessary use level of traditional antimicrobial compounds in the formula. In this series of publications, we present studies to demonstrate how the antimicrobial product protection effectiveness of multifunctional cosmetic ingredients, which are known product protection enhancers, can be optimized by combining them with additional barriers, such as pH, water activity, organic acids, chelating agents, etc. In the first part of the series, we examine the effect of pH and organic acids. Note de contenu : - pH - Organic acids - EXPERIMENTAL : Materials - Microbial challenge tests - Emulsion preparation - RESULTS : Effect of pH - Effect of organic acids - Table 1 : O/W anionic emulsion formula - Table 2 : pKa values of phytic acid - Figure : Chemical structures of organic acid salts used in this study En ligne : https://drive.google.com/file/d/1s7GD6GENUe6NaQUHLycrulS73GiLiySe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40545 [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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Phytic acid oligomers as bio-based crosslinkers for epoxy and polyol resins / P. Böhm in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 355-367 Titre : Phytic acid oligomers as bio-based crosslinkers for epoxy and polyol resins Type de document : texte imprimé Auteurs : P. Böhm, Auteur ; Michael Dornbusch, Auteur ; J. S. Guttmann, Auteur Année de publication : 2024 Article en page(s) : p. 355-367 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Biopolymères Caractérisation Epoxydes Oligomères Phytique, Acide Polymères -- Synthèse Polyols Ressources renouvelables Réticulants Réticulation (polymérisation) Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In recent years, the chemical industry is not only striving to produce the best possible products for various applications, but the new products should ideally be based on renewable resources. The ideal case of "cradle to cradle" is generally not achievable in the coatings industry, as maximizing product life and preventing product degradation in the environment is usually one of the main goals of the coatings industry. Therefore, if the coatings industry wants to act sustainably, its efforts should be focused on renewable raw materials. This paper presents a process that makes the renewable raw material phytic acid easily accessible for conventional epoxy and polyol resin coating systems through hydrophobization- and oligomerization. Phytic acid, as a phosphorus reservoir in plants and with beneficial properties for corrosion protection and as a flame retardant, could be a new base for various coatings. In this work, a simple one-pot oligomerization of phytic acid with green mono- and difunctional alcohols is investigated. The aim of this work is to create a phytic acid hardener system based on renewable raw materials that can produce coatings with solvent-based epoxy and polyol binders as well as water-based epoxy binders. The successful reaction was observed by infrared, 1H-NMR, and 31P-NMR spectroscopy and the acid equivalent weight was determined by conductivity titration. The renewable curing agent was then used equivalently with different binder systems to prepare coatings. Crosslinking and glass transition temperature were monitored using oscillatory rheology. The coatings were applied to glass plates and the pendulum hardness was measured. A simple heating test followed by 31P-NMR and IR spectroscopy was also performed to demonstrate the stability of phytic acid under reaction conditions. Note de contenu : - EXPERIMENTAL : Analytical methods - Materials - Synthesis - Synthesis overview - Thermal stability - Network formation - Pigment paste preparation - Additional measurements - RESULTS AND DISCUSSION : Thermal stability - Synthesis and characterization - Network formation - Application testing - Dispersing and hardening agent - Table 1 : Theoretical composition of the PA-oligomers - Table 2 : Application data of various PA-oligomers with different binders - Table 3 : Color measurement of dried pigment pastes - Table 4 : Application data of PA-oligomer/ Bayferrox 130 M pigment paste with different binders DOI : https://doi.org/10.1007/s11998-023-00827-x En ligne : https://drive.google.com/file/d/1mOh6hQb3FLC0dh8Sa3R3FVKIgR1gDTKI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40458 [article]

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Synthesis of phytic acid-layered zinc oxide hybrid nanoparticles and their flame-retardant applications in polyurethane coatings / Karan Bansal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 369-382 Titre : Synthesis of phytic acid-layered zinc oxide hybrid nanoparticles and their flame-retardant applications in polyurethane coatings Type de document : texte imprimé Auteurs : Karan Bansal, Auteur ; Siavash Mansouri, Auteur ; Dilpreet Bajwa, Auteur ; Shanti Swarup, Auteur ; Mohiuddin Quadir, Auteur Année de publication : 2024 Article en page(s) : p. 369-382 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Enrobage (technologie) Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Nanoparticules -- Synthèse Oxyde de zinc Phytique, Acide Polyuréthanes Revêtements -- Additifs Revêtements -- Propriétés thermiques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Phytic acid (PA)-coated zinc oxide (ZnO) nanoparticles were developed to produce high-efficiency flame-retarding (FR) additives for coating formulations. These hybrid (organic/inorganic) additives were fabricated using a layer-by-layer (LBL) approach to harness the FR properties of PA and ZnO on a single-platform nanoscale scaffold. These nanoparticles can be uniformly dispersed in a polyurethane (PU) coating for applications on metal substrates. The incorporation of the PA/ZnO layer-by-layer nanoparticles at 20 wt% of the polymeric resin did not adversely affect the physico-mechanical properties of the coatings. Flame-retardant properties of PU samples containing nanomaterials, showed a 50% reduction in flame spread rate than that observed from the samples prepared with only ZnO nanoparticles. Cone calorimeter studies performed on the metal panels coated with 20 wt% PA/ZnO nanoparticles-infused PU resins showed a 25% reduction in peak heat release rate and a 50% reduction in total heat release (THR) compared to control coatings prepared without nanoparticles. Scanning electron microscopy images revealed the presence of bubble-like morphologies in the burnt samples containing the nanoparticles, indicating char formation and obstruction of escaping gases produced during the burning of the coating materials. This study clearly reveals that the coatings prepared with PA/ZnO hybrid nanoparticles can protect metal substrates against fire-related damage. Note de contenu : - MATERIALS : Methods - Characterization of nanoparticles - Characterization of PU coatings on metal substrates - RESULTS AND DISCUSSION : Synthesis of PA-layered ZnO nanoparticles as functional FR nanomaterials - Nano-chemical and thermal characterization of nanoparticles - Incorporation of PA-layered ZnO nanoparticles in PU coatings and analysis of coating properties - Characterization of thermal properties of PU coatings containing PA/ZnO nanoparticles using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) - Evaluation of FR properties using cone calorimeter studies - Horizontal burning test of UL-94 samples prepared from nanoparticle-infused PU resins - Table 1 : Particle size (hydrodynamic diameter) of the nanoparticles along with PDI and zeta potential - Table 2 : Coating properties of polyurethane (PU) formulations containing ZnO nanoparticles and ZnO/PA-BL nanoparticles at different loading concentrations - Table 3 : Glass transition temperature (Tg), degradation temperature at 5% weight loss (Td5), and weight remaining of the film after exposure to 500°C of the polyurethane coatings - Table 4 : Time to ignition (TTI), peak heat release rate (pHRR), total heat release (THR), total smoke release (TSR), and flame retardancy index (FRI) of control coating and coatings containing ZnO and ZnO/PA-BL nanoparticles at 20 wt% loading concentration DOI : https://doi.org/10.1007/s11998-023-00828-w En ligne : https://drive.google.com/file/d/13XsUainuKttYmpAr5TC8PkMi_hhQEXdE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40459 [article]

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