Corrosion prevention through pigmentory properties / Ruhee Anil Gharat in PAINTINDIA, Vol. LXVII, N° 11 (11/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 11 (11/2017) . - p. 64-80 Titre : Corrosion prevention through pigmentory properties Type de document : texte imprimé Auteurs : Ruhee Anil Gharat, Auteur ; Sandesh Naresh Patil, Auteur Année de publication : 2017 Article en page(s) : p. 64-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Essais (technologie) Essais de brouillard salin Métaux -- Revêtements protecteurs Pigments inorganiques Pigments métalliques Index. décimale : 667.9 Revêtements et enduits Résumé : The inhibition efficiency of anticorrosive pigments such as zinc chromate, zinc phosphate, modified zinc phosphate and zinc-free compounds is dependant on their purity, solubility, morphology, types of ions, pigment-polymer interactions, pigment volume concentration, the environment surrounding them and the substrate. The ojective of this paper is to review the knowledge of these pigments and the state-of-the-art in terms of anticorrosive materials; this knowledge can be used to simplify the criteria for selecting anticorrosive pigments for a given application. It is well-know that the performance of a protective coating can distinctly be affected by incorporation of anticorrosive pigments. Therefore the choice of anticorrosive pigments used in conjunction with suitable binder systems plays a major role when trying to protect metals from corrosion by means of protective coatings. The most important role of anticorrosive pigments in protective coating technology is probably the control of corrosion, even though the degree of corrosion protection of a coating depends not only on the kind on the anticorrosive pigments used. The anticorrosive properties of seven phosphate based pigments, calcium exchange silica, chromate and a ferrite were assessed by electrochemical technoques and formulating solvent borne paints with epoxy and alkyd resins. One of the most important factors besides the pigment used is the resin system selected in order to formulate the coating. The functional pigments determine the role of the paint in the system. It can give enhance properties such as hardness or resistance against abrasion, impermeability and protection from UV radiation. In addition, anticorrosive pigments such as zinc dust play an active role in prevention steel from rusting. Extenders are the other solid components of a paint that are made up of substances that have a different chemical nature, grain-size and shape. Carefully chosen and mixed, they may be used to change a paints consitency for application purpose, rein forcres the film's mechanical and chemical strength and also to increase its hardness, its flexibility and its resistance against abrasion. Note de contenu : - CLASSIFICATION OF ANTICORROSIVE PIGMENTS : Inorganic anticorrosive pigments - ANTICORROSIVE PIGMENT OF TYPE I - ANTICORROSIVE PIGMENTS OF TYPE II - ANTICORROSIVE PIGMENTS OF TYPE III - MECHANISM OF CORROSION OF IRON : At anode - At cathode - PHOSPHATE PIGMENTS : Zinc Phosphate (Zn3(PO4)2) - Modified orthophosphate - Chromium phosphate: CrPO4.3H2O - Modified polyphosphates - CHROMATE-BASED COMPOUNDS : Strontium chromate - POWDER METAL COATINGS : Zinc-rich paints or primer - MOLYBDENUM BASED ANTICORROSIVE PIGMENTS : Phospho-molybdate pigments - METAL OXIDE PIGMENTS : Zinc and calcium ferrites: 2CaO.FeO3.&CaO.Fe2O3/Zn(MgO)O.Fe2O3. - Red lead - MULTIPHASE PHOSPHATE PIGMENTS : Zinc Hydroxyphosphite - Iron phosphide - LEAD & ZINC CYANAMIDE PIGMENTS - ANTICORROSIVE PIGMENTS BASED ON METAL ! Titanium Dioxide (TiO2) - STUDY OF PIGMENT WHICH IS TESTED BY SALT SPRAY METHOD & SHOWS GOOD RESULTS : Comparison studies between phosphate and modified orthophosphates - Comparison studies between polyphosphate and modified polyphosphate using salt spray method - REGULATORY AFFAIRS : Toxicology and occupational health - Environmental aspects - THE FUTURE - SMART COATINGS - NANOTECHNOLOGY - ENVIRONMENT FRIENDLY PAINTS AND PIGMENTS - INHIBITOR En ligne : https://drive.google.com/file/d/1_xIZay8fZWKdCZ1TkkdpOfLukeV0prQw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29732 [article]

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Introduction of green chemistry in coating technology / Sandesh Naresh Patil in PAINTINDIA, Vol. LXXIII, N° 3 (03/2023)  

[article]  inPAINTINDIA > Vol. LXXIII, N° 3 (03/2023) . - p. 52-64 Titre : Introduction of green chemistry in coating technology Type de document : texte imprimé Auteurs : Sandesh Naresh Patil, Auteur Année de publication : 2023 Article en page(s) : p. 52-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bilan des émissions de gaz à effets de serre Biomasse Chimie écologique Huiles et graisses végétales Polyéther bloc amide Polyols Ressources renouvelables Revêtements organiques Solvants écologiques Index. décimale : 667.9 Revêtements et enduits Résumé : Vegetable oils, solvents, natural polymers are the crucial ingredient of many research and industrial chemical processes and consumer product formulations. Out of which vegetable oil constitute the single, largest, easily available, low cost, non-toxic, non-depletable, biodegradable family yielding materials that are capable of competing with fossil fuel derived petro-based products. It helps reduce the carbon footprint and environmental impact of chemicals on it, in addition to societal and legislative push that more products be produced from carbon-neutral resources. Biomass is a promising renewable alternative resource for producing bio-solvents, and this review focuses on their extraction and synthesis on a laboratory and large scale. Starch, lignocellulose, plant oils, animal fats and proteins have been fused together with synthetic pathways, green technologies and processes to form known or new bio-derived solvents including Alcohols, esters, terpenes, benzenes, toluene and xylene (BTX),ethers alkanes, aromatics, ionic liquids (ILs), furans, liquid polymers and deep eutectic solvents (DESs)—all with unique physiochemical properties that warrant their use as solvation agents in manufacturing of coating, pharmaceutical, cosmetics, chemicals, energy, food and beverage industries, etc. The most important feature of vegetable oil is their unique chemical structure with unsaturation sites, epoxies, hydroxyls, esters and other functional groups along with inherent fluidity characteristics. These enable them to undergo various chemical transformations producing low molecular weight polymeric materials with versatile applications, particularly as heart or centric ingredients in paints and coatings. Note de contenu : - BIO BASED OR BIO SOLVENTS - ALCOHOLS : Ethanol, propanol and butanol - Furfuryl alcohol - Glycerol and its derivatives - Glycerol oligomers and polymers - Diols - ESTERS : Acylic esters - Glycerol carbonate and y-Valero lactone - Cyrene - Alkanes and aromatics - Ethers - IONIC LIQUIDS - DEEP EUTECTIC SOLVENTS : Oils & acid ingredients vegetable oils used as polymeric coatings - Alkyds - Polyester amides (PEA) - Polyether amides - Polyurethanes - Epoxies - Polyols En ligne : https://drive.google.com/file/d/186BAV3BVBr7JwsoHA1Auhad2_tIaapSC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39603 [article]

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