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Studies on the corrosion characteristics of a few coated reinforced TMT bars used in concrete structure / Dhurjoti Banerjee in PAINTINDIA, Vol. LXII, N° 4 (04/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 4 (04/2012) . - p. 49-53 Titre : Studies on the corrosion characteristics of a few coated reinforced TMT bars used in concrete structure Type de document : texte imprimé Auteurs : Dhurjoti Banerjee, Auteur ; Buddhadeb Duari, Auteur ; Rajib Dey, Auteur ; Bimal Chaudhuri, Auteur ; Debasish Sarkar, Auteur Année de publication : 2012 Article en page(s) : p. 49-53 Langues : Anglais (eng) Catégories : Anticorrosion Barres d'armature Polyuréthanes Revêtements -- Corrosion Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : The corrosion behavior of coated reinforced TMT bars used in conjunction with concrete structure have been investigated individually and also with various conditions of coated contretes. Corrosion characteristics of the coated & uncoated materials were measured then potentiostatically. The Icorr & Ecorr values were calculated using Gamry Echem Software and Tafel's extrapolation methods. The measurements were made based on the principle of Evans diagram Icor is free corrosion current & if it is more, it is corroding faster. Ecorr value if less negative is more safer & if it tends to zero it is less corroding and at zero value there is no corrosion. If Ecorr value is positive then it is considered as nobler or getting protected. Comparing the results it has been observed that polyurethane coating in reinforced TMT bars seems to be a potential coating material for resistance corrosion. Note de contenu : - Sample preparation - Experiments - Processing of polarization data for the estimation of Ecorr & Icorr - Corrosion data of the specimens Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14750 [article]

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Silicone release coatings / Brijesh Mishra in PAINTINDIA, Vol. LXII, N° 4 (04/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 4 (04/2012) . - p. 55-61 Titre : Silicone release coatings Type de document : texte imprimé Auteurs : Brijesh Mishra, Auteur Année de publication : 2012 Article en page(s) : p. 55-61 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Revêtements:Peinture Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : Release coatings are generally used to prevent things from sticking together ! These coatings can be temporary or permanent depending on the type of application & perform unique & challenging functions. The most commonly used release coatings are based on silicones due to their unique chemistry. - Silicone release coatings can be solvent or water based or solvent-less catalyses normally with Tin/Platinum depending on application & performance requirements. They can be heat cured or UV cured. - From the viewpoint of application substrates, each system has its preferences and advantages. Solvent-based silicones are versatile - they can be used on just about anything. Solventless silicones are used on calendered Kfraft, glassine, polycoats, clay-coated papers, and films. emulsion's growth center on machine-grade papers and glassine, while UV is primarily used on films. - The chemistry allows formulation of systems which can be tailor-made for different applications areas ranging from release labels to diaper closures, health, beauty & medical & manuy other applications such as non-stick cookware, etc. Note de contenu : - RELEASE COATING MARKETS - CURE CHEMISTRIES AND DELIVERY SYSTEMS : Development, progress and trends - Catalyst - Inhibitors - High-release - FACTORS AFFECTING RELEASE PERFORMANCE : a) Humidity and substrate stiffness - b) Temperature - TESTING : a) Raw materials - b) Finished product testing - SYSTEM SELECTION : Solvent-based vs. solventless vs. emulsion delivery systems Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14751 [article]

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Next generation additive performance - modern formulations for decorative paints and coatings / Vicky James in PAINTINDIA, Vol. LXII, N° 4 (04/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 4 (04/2012) . - p. 65-69 Titre : Next generation additive performance - modern formulations for decorative paints and coatings Type de document : texte imprimé Auteurs : Vicky James, Auteur ; Pierre Leger, Auteur Année de publication : 2012 Article en page(s) : p. 65-69 Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Qualité -- Contrôle Revêtement mural:Peinture murale Revêtements -- Additifs:Peinture -- Additifs Revêtements décoratifs:Peinture décorative Revêtements en bâtiment:Peinture en bâtiment Index. décimale : 667.9 Revêtements et enduits Résumé : Trends in the decorative market are strongly driven by two sources today. The first driver is legislation, where compliance to Volatile Organic Compounds (VOC) regulations is non-negotiable and is forcing formulators to look carefully at all their ingredients (including additives) to control VOC to low levels (<50g/l). The second driver, and arguably the most important, is the end consumer, who are asking for longer lasting,better performing products from the OEM producers and additionally easier to use products thar are "less harmful" to themselves and their families in the Do-It-Yourself market - this could mean lowder odor,less solvent or quicker drying for example - and there is an ever growing popularity of "eco" brands in the market. For home-use architectural paints, the good hiding power, good wetting and low dirt pick-up is important to the end user. The desire to achieve better hiding power of paints results in an open film with high PVC (Pigment Volume Concentration which often has limitations with respect to water resistance, weter beading and dirt pick-up. For wood coatings, water resistance is also an extremely important attribute to prevent peeling and cracking but also to maintain the aesthetics of the coatings. OEM applied wood coatings also require anti-blocking resistance during production, storage and shipping to prevent damage to the goods. This paper demonstrates how silicone chemistry can help formulator meet both the environmental and performance demands of the end consumer, giving the formulator possibilities to differentiate their product line or indeed achieve the same performance of current commercial paints or coatings more economically. In doing so they are also meeting the necessary legislative regulations. Dow Corning 87 Additive and Dow Corning 88 Additive are new silicone-based additives which bring differentiated performance to the en user - we will demonstrate how, at low levels (typically 2-5%) these additives impart good water resistance, and we will sho examples in architectural paints compared to the incumbent silicone resin emulsion technology (typically used at 5-10%). Dow Corning 87 additives will also impart water beading, a property typically perceived by the end user as meaning excellent water resistance, giving a 2-in-1 additive option and simplifying the formulation. Lastly we will show the possibilities to bring a anti-blocking as a secondary attribute to wood coatings. Whilst we endeavor to provide the requirements of the end user, of course we also to consider the needs of the formulator during the paint making process ! They too have needs to meet, especially with respect to foam control, which cancause problems during the manufacturing and filling processes. In this paper we will also show how Dow Corning 62 Additive and Dow Corning 68 Additive -highs solids silicone emulsions - can be used at lower addition levels to achieve good foam control. Finally all these attributes must come at an afordable cost. We will demonstrate the effectiveness of the various Dow Corning additives at low addition levels in the paint to reach this final goal. Note de contenu : - Improving the durability of architectural paints - Dow Corning 87 additive and Dow Corning 88 additive - Anti-blocking in wood coatings - Controlling foam in decorative paints and coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14752 [article]

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