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Implication of coalescing agents and associative thickeners on rheology of water borne coatings / Ritesh A. Bhavsar in PAINTINDIA, Vol. LXII, N° 6 (06/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 6 (06/2012) . - p. 49-54 Titre : Implication of coalescing agents and associative thickeners on rheology of water borne coatings Type de document : texte imprimé Auteurs : Ritesh A. Bhavsar, Auteur ; Vaibhav J. Dave, Auteur ; Randhirsinh Parmar, Auteur Année de publication : 2012 Article en page(s) : p. 49-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coalescence (Sciences physiques) Epaississants Latex Polyacryliques Polymères en émulsion Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Screening specific concentration of ingredients is a difficult job while formulating a latex paint. It is the composition of binder and various ingredients such as pigments, coalescing agents, thickeners, surfactants, wetting agents, etc. The properties of paint are highly dependent upon the property of binder and its interactions with other ingredients. Rheology is one of the important property for paint, responsible for its performance during manufacture, storage and applications. In this study we discuss the theological interactions of acrylic emulsion (AE) with coalescing agents and associative thickeners to screen these ingredients for the paint formulation. Two hydrophobic coalescing agents and three types of HEUR (hydrophobically modified ethoxylated urethane thickener) and HASE (hydrophobically modified alkali swellahle emulsion thickeners) classified as high, mid and low shear thickener with different concentration are used in this study. Flow curve, 31TT (Three Interval Thixotropy Test), Oscillatory amplitude sweep test (AS) are carried out to study the influence of these ingredients on rheology. She viscosity increases as the concentration of coalescing agent and associative thickener increases. The mechanism of interaction and efficiency of ingredients with acrylic emulsion is discussed. Note de contenu : - EXPERIMENTAL : Materials and methods - Rheological measurements - RESULTS AND DISCUSSION : Effect of coalescing agent - Interactions of associative thickener with acrylic emulsion Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15650 [article]

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Eco-friendly organic coatings based on true self-curable polyepoxides for cathodic electrodeposition / Aadamvir Singh in PAINTINDIA, Vol. LXII, N° 6 (06/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 6 (06/2012) . - p. 55-62 Titre : Eco-friendly organic coatings based on true self-curable polyepoxides for cathodic electrodeposition Type de document : texte imprimé Auteurs : Aadamvir Singh, Auteur ; Raju, Auteur ; Pramod Kumar, Auteur Année de publication : 2012 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dépôt électrolytique Epoxydes Réticulation (polymérisation) Revêtements Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : True self-curable CED resin system has been developed by using polyepoxide resins based on phenol-novolacs. For this, phenol-novolacs (PNs) of four molar ratios of phenol to formaldehyde viz. 1:0.6, 1:0.7, 1:0.8 and 1:0.9 were synthesized in acidic medium, which were subsequently epoxidized with epichlorohydrin to make epoxy phenol-novolac (EPN) resins of different molecular weights. The prepared resins were characterized by FTIR spectroscopic technique for their structure elucidation and by gel permeation chromatography (GPC) for molecular weight determination. EPNs were reacted with varying molar ratios of a secondary amine; such as diethanolamine (DEtOA), to produce EPN-DEtOA adducts having tertiary amino groups introduced into their molecules. The suitable molar ratio of DEtOA to EPN varied with the molecular weight of EPN, which was higher for EPN of higher molecular weight. These tertiary amino groups would, in fact, initiate the self-curing (polymerization) of resins as applied films, by using free epoxy groups of epoxy-amine adducts, via anionic polymerization. As a consequence, EPN-DEtOA adducts could self-cure without any additional/external crosslinker, even in the co-reacted form. The adducts (modified EPNs) were rendered water-soluble by neutralizing with acetic acid. Aqueous solutions of acetic acid-neutralized adducts were used as electrolytic compositions for the deposition of films of modified polyepoxide (adduct) coatings on metallic panel (workpiece) used as cathode of the electrodeposition cell. By carrying out judiciously planned experiments for cathodic electrodeposition, the electrodeposition characteristics, such as electrodepo- sition yield, dry film thickness and coulombic yield, were determined and optimized. The cathodically electrodeposited films, after self-curing, were characterized for their physical properties, chemical resistance and corrosion protection performance. Note de contenu : - EXPERIMENTAL : Materials - Methods - Synthesis of CED coating binders - Cathodic electrodeposition of films - RESULTS AND DISCUSSION : FTIR spectroscopy - Gel permeation chromatography (GPC) - Characteristics of polyepoxide (EPN) resin - Cathodic electrodeposition of adduct films - Self-curability of adduct as cathodically electrodeposited films - Physical properties of CED films - Chemical resistance properties of CED films - Corrosion protection performance of CED films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15651 [article]

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Corrosion behaviour of hydroxyapatite coatings on borate and phosphate passivated 316L stainless steel in Ringer's solution in PAINTINDIA, Vol. LXII, N° 6 (06/2012)  

[article]  inPAINTINDIA > Vol. LXII, N° 6 (06/2012) . - p. 63-66 Titre : Corrosion behaviour of hydroxyapatite coatings on borate and phosphate passivated 316L stainless steel in Ringer's solution Type de document : texte imprimé Année de publication : 2012 Article en page(s) : p. 63-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Hydroxyapatite L'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate. L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte. Revêtements -- Corrosion Revêtements protecteurs Ringer, Liquide de Index. décimale : 667.9 Revêtements et enduits Résumé : Corrosion resistance property of 316L stainless steel sample was studied in Ringer's solution after passivating them with phosphoric acid (H2PO4) and sodium tetraborate. A few freshly phosphate and borate passivated samples were electrophoretically coated with hydroxyapatite. These coated samples were tested corrosion resistance in Ringer's solution. Note de contenu : - Sample preparation - Evaluation of H3PO4 & borate treatments - HAP coating - Corrosion testing En ligne : http://buddhadebduari.net/publications/corrosion_behaviour_of_hydroxyapatite_coa [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15652 [article]

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Pigments part - V / Mukund Hulyalkar in PAINTINDIA, Vol. LXII, N° 6 (06/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 6 (06/2012) . - p.109 Titre : Pigments part - V : Continued for the last issue Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2012 Article en page(s) : p.109 Langues : Anglais (eng) Catégories : Pigments inorganiques Spécifications Index. décimale : 667.2 Colorants et pigments Résumé : From the last few issues we are giing specifications for all the pigments which are commonly used in paint and coating industry. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15653 [article]

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