An assessment on anti-corrosion properties for high performance coatings based on CNSL resin / Vishal Nikam in PAINTINDIA, Vol. LXXII, N° 10 (10/2022)  

[article]  inPAINTINDIA > Vol. LXXII, N° 10 (10/2022) . - p. 53-68 Titre : An assessment on anti-corrosion properties for high performance coatings based on CNSL resin Type de document : texte imprimé Auteurs : Vishal Nikam, Auteur ; Narayani Rajagopalan, Auteur ; Chinmaya Nayak, Auteur Année de publication : 2022 Article en page(s) : p. 53-68 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Biopolymères Liants Noix de cajou et constituants Réticulants Revêtements (produits chimiques) Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Coating industry is currently in need of renewable resources and cashew nut shell liquid (CNSL) has been found to be ranked as an efficient bio-based resource to make polymers and resins. CNSL based resins and polymers have been extensively studied for their application in the field of protective coatings, which can help to improve the anti-corrosion, anti-fungal and anti- bacterial properties of coatings. The CNSL chemical structure offers pathways for a number of polymerization reactions owing to its reactive phenolic structure and meta-substituted unsaturated aliphatic chain. To add on to the inherent unique properties, CNSL is also cheap and easily available and thus is an economical and bio-friendly sustainable resource. The long aliphatic chain in the structure of CNSL is known to impart excellent and-corrosion, water resistance and flexibility to coatings. The present review paper mainly focuses the anti-corrosion properties of CNSL based coatings. Note de contenu : - CHARACTERISTICS OF CNSL - APPLICATION AND PROPERTIES : CNSL modified curing agents with anti-corrosion property - CNSL based resins with anti-corrosion - CNSL based binder and hardener coating system with anti-corrosion property - CNSL based PU coating wiah anti-corrosion property - Table 1 : Physicochemical characteristics of cashew nut shell liquid CNSL En ligne : https://drive.google.com/file/d/1_rijaYSjAZYqNSyMPsywDi1-9bsERJLB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38538 [article]

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Cardanol based epoxy coatings : studies on chemical, mechanical and thermal properties / Thorat Dipika in PAINTINDIA, Vol. LXIX, N° 9 (09/2019)  

[article]  inPAINTINDIA > Vol. LXIX, N° 9 (09/2019) . - p. 55-70 Titre : Cardanol based epoxy coatings : studies on chemical, mechanical and thermal properties Type de document : texte imprimé Auteurs : Thorat Dipika, Auteur ; Narayani Rajagopalan, Auteur ; Chinmaya Nayak, Auteur Année de publication : 2019 Article en page(s) : p. 55-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cardanol Epoxydes Extraction (chimie) Produits chimiques -- Purification Revêtements (produits chimiques) Revêtements organiques Séparation (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : CNSL and its derivatives have recently received much attention due to its origin as a natural source and ease of availability in abundance. Chemical modification of CNSL and cardanol offer pathways for their utilization in variety of applications in polymers and coatings, driving coating technology towards environmnent-friendly and green technology. CNSL has been widely studied for synthesis and development of epoxy resins, hardeners for epoxies, epoxy diluents applicable in epoxy functional protective coatings. The present review briefs the work done especially in the area of CNSL based epoxy coatings and their thermal, mechanical, chemical and anti-corrosion properties. Note de contenu : - Synthesis extraction of CNSL : Refining of CNSL - Purification and separation methods - REACTIVITY OF CNSL - PROPERTIES AND APPLICATIONS OF CNSL IN COATINGS - CNSL BASED EPOXY COATINGS : Study of epoxy resin for coating applications derived from cardanol - Fig. 1 : Cashew fruit, cross-section fo cashew nut, and cashew nut shell liquid - Fig. 2 : Reactive sites of cardanol - Fig. 3 : Reaction products of cardanol - Fig. 4 : Applications of CNSL and its derivative - Fig. 5 : Synthesis of ECP from cardanol - Fig. 6 : TG1 graph of ECP coatings compared to commercial cashew coating - Fig. 7 : BADGE, idealized structure of epoxy cardanol NC-514, epoxided resorcinol, hBaDGE AND EPOXIDED tmp - Fig. 8 : Glass transition temperature of the epoxy resin mixed hBADGE, resorcinol and TMP ; cure IPDA and Jeffamine T403 - Fig. 9 : Water absorption and water contact angle of coatings - Fig. 10 : TGA graphs of MSIL and MTHPA cured coatings - Fig. 11 : Tafel plot of MSIL and MTHPA cured coatings - Fig. 12 : Cardanol based epoxidized resol resin - Fig. 13 : Epoxidation of cardanol-based resole resin - Fig. 14 : TGA scan of epoxidized resole resin - Fig. 15 : Graphs of effects of acids , alkalis and slvents on the ERCF resin - Fig. 16 : Salt spray photos of cured epoxy blank and CNE/CPA films having different mixing ration wt %) at different exposure time before exposure and after 90 days - Fig. 17 : Synthesis - Table 1 : Physical properties of CNSL - Table 2 : Chemical properties of CNSL En ligne : https://drive.google.com/file/d/1L5QC7OQkriy9HGIavUQKgmx3fiT0YuRs/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33073 [article]

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Graphene based functional coatings : an introspection / Ravindra Bari in PAINTINDIA, Vol. LXXII, N° 12 (12/2022)  

[article]  inPAINTINDIA > Vol. LXXII, N° 12 (12/2022) . - p. 53-72 Titre : Graphene based functional coatings : an introspection Type de document : texte imprimé Auteurs : Ravindra Bari, Auteur ; Narayani Rajagopalan, Auteur ; Chinmaya Nayak, Auteur Année de publication : 2022 Article en page(s) : p. 53-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Epoxydes Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Matériaux -- Propriétés fonctionnelles Primaire (revêtement) Revêtements en phase aqueuse Revêtements organiques Revêtements protecteurs Silanes Sol-gel, Procédé Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : Research on graphene is a fast-developing field, with new concepts and applications appearing at an incredible rate. Recent research studies have been aimed at improving the resistance of coatings against such degradation using nanomaterials. Recently the uses of graphene nano-flake rein forcements in polymeric coatings have been extensively investigated by many scientists to achieve such improvements. It has been postulated that graphene can act as a strong blocking agent and increase the resistance of coatings against UV light, moisture, oxygen, and so on. Electrochemical studies, mechanical studies have been carried out by many researchers to investigate the functional properties of graphene in coatings. The present review addresses the work done on graphene based coatings to study its performance in protective coatings. Note de contenu : - Graphene based epoxy coatings - Graphene based water-borne epoxy coating - Graphene based zinc rich epoxy primer coating - Graphene based anti-corrosive ink coating - Graphene based sol-gel silane En ligne : https://drive.google.com/file/d/1XA6WeQxHI5OYAt955yA5Rc4zKyEIwvE1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39319 [article]

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A review on : CNSL based polyurethane, polyester and polyurea coatings / Sonam Saxena in PAINTINDIA, Vol. LXIX, N° 11 (11/2019)  

[article]  inPAINTINDIA > Vol. LXIX, N° 11 (11/2019) . - p. 55-64 Titre : A review on : CNSL based polyurethane, polyester and polyurea coatings Type de document : texte imprimé Auteurs : Sonam Saxena, Auteur ; Narayani Rajagopalan, Auteur ; Chinmaya Nayak, Auteur Année de publication : 2019 Article en page(s) : p. 55-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Noix de cajou et constituants Polyesters Polyurée Polyuréthanes Ressources renouvelables Revêtements -- Analyse:Peinture -- Analyse Revêtements organiques Structure chimique Index. décimale : 667.9 Revêtements et enduits Résumé : Cashew nut shell liquid (CNSL) and its main derivative, cardanol offers a number of polymerization reaction due to the inherent chemical structure containing a reactive phenolic group and an unsaturated aliphatic chain in the meta position of the aromatic ring. Also, as a natural product, CNSL is an alternative resource to synthesize various resins and coatings contributing to green and sustainable technology. The present review focuses the work done with CNSL and its derivatives to develop coatings namely, polyurethane, polyester and polyurea coating along studies done with respect to the functional properties of the with coatings developed. Note de contenu : - SYNTHESIS AND CHARACTERISTICS OF CNSL - CNSL BASED COATINGS : CNSL based polyurethane coatings - CNSL based polyurea coating - CNSL based polyester coating - Fig. 1 : Chemical composition of CNSL - Fig. 2 : Decarboxylation of anacardic acid to cardanol - Fig. 3 : Percentage water absorption measured for all the cured films after 24h dip test - Fig. 4 : DSC spectrum for N-75 cured coatings and DSC spectrumfor N-3390 cured coatings - Fig. 5 : Tafel graphs for N-75 cured coatings in 3.5% NaCl solution and Tafel graphs for N-3390 cured coatings in 3.5% NaCl solution - Fig. 6 : FTIR spectra for NC-514 and CC evaluated in chloroform solvent - Fig. 7 : TGA graph of NIPU coatings - Fig. 9 : Bode plots of 2K-aqueous polyurethane coatings HDI based system and IPDI based system - Fig. 10 : Synthesis of epoxidized cardanol and cardanol based polyols - Fig. 11 : DSC thermograms of UV-PUD films - Fig. 12 : TGA curves of the cured films - Fig. 13 : TGA of HDI and IPDI based coating - Fig. 14 : Bode plot of HDI and IPDI based coatings - Fig. 15 : Tafel plots of HDI and IPDI based coatings - Table 1 : Physical and chemical properties of CNSL En ligne : https://drive.google.com/file/d/1stSa3ITAJ3XsITtOfS2WPbm8xfR5xXMj/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33634 [article]

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Role of micaceous iron oxide in protective coatings / Chinmaya Nayak in PAINTINDIA, Vol. LII, N° 11 (11/2002)

[article]  inPAINTINDIA > Vol. LII, N° 11 (11/2002) . - p. 52-72 Titre : Role of micaceous iron oxide in protective coatings Type de document : texte imprimé Auteurs : Chinmaya Nayak, Auteur Année de publication : 2002 Article en page(s) : p. 52-72 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Résistance  intempérie'  Feuil  'Perméabilité  eau'  'Propriété  physique'  Délaminage  Cloquage  Liant  'Forme  particule'  'Concentration  pigmentaire  volumique  critique'  volumique'  Performance  'Structure  lamellaire'  Fer  Oxyde  'Protection  corrosion'  'Pigment  anticorrosion'  minéral'  Formulation  'Peinture  Matériau  Revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Micaceous iron oxide (MIO) pigments have long been used successfully all over the world in a variety of protective coatings for long term protection of structural steels. The protective characteristics of these pigments have been attributed to the orientation of lamellar and flaky pigments which produces an increase in resistance to water permeation through the paint film. Use of micaceous iron oxide also reduces the ultraviolet degradation of the binder system and provides mechanical reinforcement to the paint film. The present article deals with the physical and chemical characteristics of these pigments and their effects on the final coating performance. Several other factors such as their incorporation level, influence of pigment volume concentrations, compatibility with different binders and extenders have also been discussed. The mechanism, using micaceous iron oxide has also been discussed in detail. Special emphasis has also been focussed on their water permeability and weatherability characteristics. In addition to this the blistering behavior of the pigmented paint film has been explained on the basis of water vapor transmission phenomena. Note de contenu : - Micaceous iron oxide pigment: General features - Natural versus synthetic MIO pigment - Pigment characteristics in protective coatings - Mechanism of protection : - Barrier effect - Ultraviolet light protection - Film reinforcement and adhesion promotion - Improved intercoat adhesion - Formulation aspects - Factors affecting the coating performance : - Role of critical pigment volume concentration (CPVC) - Effect of pigment volume concentration (PVC) - Effect of particle shape on corrosion protection - Impact of different binders on coating performance : - Oleoresinous and alkyd resins - Chlorinated rubber - Acrylated rubber resin - Vinyl copolymers - Epoxy resin - Moisture cure polyurethanes - Pigment dispersion - Effective levels of incorporation of MIO pigments - Incorporation of extenders - Resistance to blistering and delamination of the paint film - Reducing pigment settlement - Widening the colour range - Water permeability characteristics - Weathering characteristics Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12425 [article]

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Silica aerogel : a comprehensive review on its synthesis, properties and role in designing thermal insulation coatings / Narayani Rajagopalan in PAINTINDIA, Vol. LXIX, N° 11 (11/2019)  

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