Chemistry & technology of stoving/baking enamel / Durgesh Soni in PAINTINDIA, Vol. LXXXIII, N° 11 (11/2023)  

[article]  inPAINTINDIA > Vol. LXXXIII, N° 11 (11/2023) . - p. 70-72 Titre : Chemistry & technology of stoving/baking enamel Type de document : texte imprimé Auteurs : Durgesh Soni, Auteur ; Arun Maithani, Auteur ; Ashok Dighe, Auteur Année de publication : 2023 Article en page(s) : p. 70-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Matériaux -- Cuisson Polyalkydes Revêtement émail:Peinture-émail Index. décimale : 667.9 Revêtements et enduits Résumé : Synthetic enamels are based on oil modified alkyds having full gloss (Gloss at 200 head > 85 %). Enamels are supposed to maintain their 'Gloss' for a prolong time at the same time maintaining film integrity (Adhesion, flexibility, colour). They are low PVC paints. Note de contenu : - Enamels are basically of two types : Air drying synthetic enamel - Stoving/baking enamels - Highlights of stoving/baking enamels - Salient features of stoved film - Formulation of a non yellowing stoving enamel white - Formulation hihglights - Fig. 1 : 1, 3, 5 tri amine, 2, 4, 6 triazine En ligne : https://drive.google.com/file/d/1UWTU9H2-DKZKGSyhIoWG_JsStEQZFKVB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40728 [article]

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Concept of non-volatile by weight & volume (NVM & NVVT), VOC in coatings formulation and application / Durgesh Soni in PAINTINDIA, Vol. LXXXIII, N° 12 (12/2023)  

[article]  inPAINTINDIA > Vol. LXXXIII, N° 12 (12/2023) . - p. 63-69 Titre : Concept of non-volatile by weight & volume (NVM & NVVT), VOC in coatings formulation and application Type de document : texte imprimé Auteurs : Durgesh Soni, Auteur ; Arun Maithani, Auteur ; Ashok Dighe, Auteur Année de publication : 2023 Article en page(s) : p. 63-69 Langues : Anglais (eng) Catégories : Calcul Composés organiques volatils Copolymère mélamine-formaldéhyde Epoxydes Formulation (Génie chimique) Isocyanates Phosphate de zinc Polyalkydes 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. Réticulants Index. décimale : 667.9 Revêtements et enduits Résumé : All raw materials of paint & coatings mostly are purchased on kilogram basis and sold on liter basis for that purpose weight per liter at applicable viscosity is an important parameter owing its allegiance to the active matter in Paint (recipe of 100 kg), this active matter is combined weight of Pigment & Resin. Solid referred as NVM (Non-volatile by mass/weight). NVVT (Non volatile by volume) in the Ltr of Paint is Volume (combined) of Pigment & Resin. This is accountable for build/thickness of paint referred as Dry Film Thickness (DFT). Note de contenu : - Volatile Organic Compound (VOC) : Formulae of alkyd - Formulation highlights - Example : What will be the amount polyamide of amine value 230 required for 100 grams of epoxy resin of EEW = 450 ? - Standard epoxy - Hardener solution - Formulation highlights - Formulation of hardener solution - High build zinc phosphate paint - Calculation of hardner - Hardner solution - Formulation highlights - Aliphatic isocyanate - Formulation highlights - Plasticizing alkyd and melamine formaldehyde resin at elevated temperature (120°C/30 min) - Formulation highlights En ligne : https://drive.google.com/file/d/1mI3ZcydbcqmIclv9AXPMemnvLaX-uefN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40741 [article]

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Eco-friendly high performance coatings from vinyl ester resins / Devendra Agarwal in PAINTINDIA, Vol. LII, N° 4 (04/2002)

[article]  inPAINTINDIA > Vol. LII, N° 4 (04/2002) . - p. 43-48 Titre : Eco-friendly high performance coatings from vinyl ester resins Type de document : texte imprimé Auteurs : Devendra Agarwal, Auteur ; Arun Maithani, Auteur Année de publication : 2002 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Vinyl ester resins with varied acid values (12, 24,35, 40 and 49 mg KOH g-1 solid) were prepared by reacting an epoxy novolac resin with methacrylic acid. The coating samples were prepared by dissolving these ester resins in styrene as a reactive diluent (40% w/w). These solution coatings were cured using benzoyl peroxide as the initiator (2 phr). The curing conditions of the experimental coatings were determined by using the Differential Scanning Calorimeter (DSC) system. The DSC scans were obtained under dynamic and isothermal conditions to choose a temperature and time for completion of the curing reaction (90 mts at ∼85øC). The coatings were applied on sandblasted steel sheet panels with the help of a film applicator for an approximate film thickness of about 100 microns. These panels were dipped into various chemicals for a period ofone year to check their chemical resistance. The mechanical and electrical properties of these coatings have also been determined. The thermal stability of these coating compositions were estimated by considering the onset degradation temperature in the thermogravimetric analysis (TGA). The coatings based on vinyl ester resin with minimum acid value was found to be the most thermally stable and having excellent mechanical, electrical and chemical resistance properties. Note de contenu : - Results and discussion : IR spectrum - Curing of samples - Thermal stability - Chemical Resistance : Acild and alkali - Solvent resistance - Mechanical properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12341 [article]

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Non isocyanate polyurethane using glycidyl acrylate monomers / Durgesh Kumar Soni in PAINTINDIA, Vol. LXXI, N° 2 (02/2021)  

[article]  inPAINTINDIA > Vol. LXXI, N° 2 (02/2021) . - p. 56-61 Titre : Non isocyanate polyurethane using glycidyl acrylate monomers Type de document : texte imprimé Auteurs : Durgesh Kumar Soni, Auteur ; Arun Maithani, Auteur ; P. K. Kamani, Auteur Année de publication : 2021 Article en page(s) : p. 56-61 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie écologique Copolymère acrylate de glycidyle Copolymère styrène acrylate glycidyle méthacrylate Cyclocarbonates Dioxyde de carbone Epoxydes Polyaddition Polyhydroxyuréthanes Revêtements sans isocyanates Stabilité hydrolytique Index. décimale : 667.9 Revêtements et enduits Résumé : Green Chemistry enables us to think beyond the con ventional materials synthesized for different applications. One such approach is the development of polyurethanes via an isocyanate free route. The chemistry is broadly based on the reaction of cyclocarbonate groups and primary diamines. The cyclocarbonate groups are synthesized bycarbonation of epoxy moieties. This opens a door for new possibilities of structure property variation in the Non Isocyanate PolyUrethanes (NIPU) and also leads to synthesis of hybrid acrylic PU and hybrid epoxy NIPU. The two monomers mainly discussed in this paper are Glycidyl acrylate and Glycidyl methacrylate which are synthesised by the reaction of epichlorohydrin with acrylic acid and methacrylic acid respectively. These monomers are then polymerized via free radical polymerization to produce glycidyl acrylate simultaneously reaction with carbon dioxide to synthesize a polymer having both epoxy groups and cyclocarbonate groups in the side chains. NIPU can also be synthesized from renewable resources also. NIPU has wide applications and can be replacement of conventional PUs in future. Note de contenu : - Introduction : Problems in conventional PUs - Moisture-sensitivity - Inferior hydrolytic stability - Glycidyl acrylate - Polymerization of glycidyl acrylate and glycidyl methacrylate - Carbonation of polymeric epoxides : radical polymerization f glycidyl acrylate alongwith CO2 fixation - Ammonolysis of cyclic carbonate - Renewable resource based - Application of NIPU En ligne : https://drive.google.com/file/d/1IegKcVRRKb9Gy-gee12cU2d39K6CJ_eQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35235 [article]

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A review of different smart coatings / Mohit Katiyar in PAINTINDIA, Vol. LXXI, N° 8 (08/2021)  

[article]  inPAINTINDIA > Vol. LXXI, N° 8 (08/2021) . - p. 70-80 Titre : A review of different smart coatings Type de document : texte imprimé Auteurs : Mohit Katiyar, Auteur ; Durgesh K. Soni, Auteur ; Arun Maithani, Auteur Année de publication : 2021 Article en page(s) : p. 70-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conducteurs organiques Matériaux intelligents Nanoparticules Peinture solaire Pigments Propriétés anti-empreintes Revêtement antireflet Revêtement auto-nettoyant Revêtement autoréparant Revêtement conducteur Revêtements antisalissures Revêtements organiques Thermochromie Index. décimale : 667.9 Revêtements et enduits Résumé : Today's coatings are becoming smarter day by day. They hold answers to some of unmet demands in different markets like automotive, industrial, marine, aerospace etc. And, it's really well sustained by intense growth of smart additives and new preparation methods. Smart Coatings are coatings, but with predefined properties and special films, which make them sense and respond to environment and other externat stimuli. Smart coatings are made of programmable materials with a variety of physical, chemical, electrical and mechanical properties. These materials can changes in light, pressure, chemical, heat along with other stimuli. Several smart coating systems have already been developed and examined, as a result they are currently under investigation by numerous laboratories and industries across the world. Examples of smart coatings include stimuli responsive, antimicrobial, antifouling, conductive, self-healing, and super hydrophobic systems. Note de contenu : - Self-cleaning coating - Anti-reflection coating - Anti-fouling coating - Anti-corrosive coating - Thermochromic coatings - Anti-fingerprint coating - Self-healing paint : Autonomous healing mechanisms-based on corrosion inhibitors - Non-autonomous healing mechanisms-based on dynamic bonds - Electrical conductive paint - Solar paint - Fig. 1 : Surface of a lotus leaf has a hierarchically rough structure - Fig. 2 : Liquid dros and uneven surface of lotus leaf - Fig. 3 : Scanning electron micrograph of lotus leaf. Schematic depicting the relationship between surface roughness and self-cleaning - Fig. 4 : Reflection and transmission of light rays - Fig. 5 : Examples of heavily fouled hulls - Fig. 6 : A multilayer structure of thermochromic coating - Fig. 7 : The coating becomes white, when is temperature reaches above the criticle temperature - Fig. 8 : DA reaction of TFAT ; SEM image of the coating showing thermally activated self-healing behavior En ligne : https://drive.google.com/file/d/1osla2mOTQvfZ2PXhAIsA5sm_j-7t_fZu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36465 [article]

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Vinyl ester resins and their blends for protective Coatings / Arun Maithani in PAINTINDIA, Vol. LVI, N° 10 (10/2006)

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