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Investigation of effect of type of pigment/extender on the stability of high pigment volume concentration water-based architectural paint / Ritesh A. Bhavsar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)
[article]
Titre : Investigation of effect of type of pigment/extender on the stability of high pigment volume concentration water-based architectural paint Type de document : texte imprimé Auteurs : Ritesh A. Bhavsar, Auteur ; Avinash Sardesai, Auteur Année de publication : 2022 Article en page(s) : p. 919-930 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Charges (matériaux)
Concentration pigmentaire volumique
Diluants
Dispersions et suspensions -- Stabilité
Floculation
Pigments inorganiques
Potentiel zeta
Revêtements en bâtiment:Peinture en bâtiment
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : This article elucidates the effect of type of pigment/extenders viz. titanium dioxide (TiO2), magnesium silicate (steatite), calcium carbonate, dolomite, precipitated sodium magnesium aluminosilicates, hydrated and calcined aluminum silicates (kaolin) when used alone or in combination in the paint dispersions on their sedimentation stability. Accelerated heat age stability test was conducted as per ASTM D 1849. Wettability of pigment extenders were measured in terms of their contact angle using Washburn technique. Rheology viscosity curve and oscillatory amplitude sweep test are carried out to depict the structural properties, more precisely the extent of flocculation in the paint dispersion. From rheology viscosity curve, extent of residual flocculation is determined using Asbeck extrapolation method. Extent of total flocculation in the paint dispersion is estimated from cohesive energy density (Ec) using oscillatory amplitude sweep test. Energy of separation of particles in flocs (Esep) is also determined using yield point measurement. Attempt was made to correlate extent of flocculation present in paint dispersion with settling and syneresis observed during accelerated heat age stability test. It is observed that, the paint dispersions based on only TiO2, only hydrous kaolin and only precipitated sodium magnesium aluminosilicates are found to be quite stable whereas the dispersions based on only magnesium silicates and only calcined kaolin are found to be unstable. Paint dispersions based on carbonate extenders show syneresis and soft settling which is easily mixable. From the rheological study, it is identified that Ec is the most crucial parameter that correlates very well with the accelerated heat age stability test results of paint dispersion. Note de contenu : - EXTENT OF FLOCCULATION : Investigation of degree of residual flocculation using Asbeck extrapolation method - Energy of separation between the particles in a flocs (E sep) - Cohesive energy density (E c)
- EXPERIMENTAL WORK : Materials - Preparation of dispersion - Characterization
- RESULTS AND DISCUSSION : Effect of type of pigment/extenders on the stability of high PVC interior paint - Powder wettability - Rheological characterization - Effect of varying ratio of unstable to stable pigment and extenders on the stability of Paint-1
- Table 1 : Physico-chemical properties of pigments and extenders used in paint dispersion
- Table 2 : Key formulation ingredients of high PVC interior paint-1 and their respective experiments with individual pigment/extender at same volume solid content
- Table 3 : Summary of pH, zeta potential, stormer viscosity of paint dispersions before and after accelerated heat age stability test
- Table 4 : Material constant and powder contact angle with DI water and surfactant solution
- Table 5 : Infinite shear viscosity (η∞) and the extent of residual flocculation (m) as computed from Asbeck model, yield point (τ0) and energy of separation of particles in floccs (Esep), viscoelastic parameter G′ and critical strain (Υc) and cohesive energy density (Ec) is summarizedDOI : https://doi.org/10.1007/s11998-021-00568-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00568-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38086
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 919-930[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23605 - Périodique Bibliothèque principale Documentaires Disponible A Journey Through Nanotechnology / Nilesh Desai in PAINTINDIA, Vol. LVII, N° 3 (03/2007)
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Titre : A Journey Through Nanotechnology : Coating Industry Perspective Type de document : texte imprimé Auteurs : Nilesh Desai, Auteur ; Avinash Sardesai, Auteur Année de publication : 2007 Article en page(s) : p. 83-104 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Nanotechnologie
Revêtements -- Industrie et commerceIndex. décimale : 667.9 Revêtements et enduits Résumé : Nanotechnology is considered to be one of the most important future technologies that will redesign the future of several technologies, products and markets. The availability of varieties of nanomaterials, various methods of assembly, application of nanomaterials, tailorability of material to suit for specific purpose and quantum effect of nanoparticles have been key for success. Because of its potential to change fundamentally whole field of nanotechnology, it will not only influence the technological development in near future but will also have decisive economic, ecological and social implications. The scientists are exploring the potential use of this technology in research with the ultimate objective of creating superior nano based coatings. This overview is meant for understanding the importance and implication of nanotechnology for the coating industry. Results indicate that the combined analysis of the hard segment cohesion helps in correlating the structure to property relationship. Note de contenu : - Introduction to Nanotechnology
- Historical chain and pioneers in nanotechnology front
- Progress in brief
- "Smaller is bigger"
- The mystery behind Nanotechnology
- The omnipresence of Nanotechnology
- Classification of nano materials :
- Nanocrystalline material
- Quantum dots
- Fullerenes
- Carbon nanotubes
- Dendrimers(Organic nanoparticles)
- Nanocomposites
- Methods for making nanosized particles
- Sol-gel process
- Chemical Vapour Deposition (CVD)
- Atomic or molecular condensation
- Using Gas-phase condensation to produce metal nanopowders
- Characterization of nanomaterials
- Significance of nanoparticles in coatings
- Nanomaterials as additive in coating industry : Nanoalumina - Nano TiO2 - Nanoparticles of Cerium oxide - Nanosilica - Nano Zinc oxide
- Nanocomposites in surface coatings: Incorporation of inorganic particles and clusters for hybrids - Intercalation - Nanostructure coreshell Polyurethane dispersions (PUD)
- Major application areas : Wood coatings - Biocidal coatings - Self cleaning paint layer - Abrasion resistance coating - Non-chromate corrosion inhibitor
- The future of nano coatingsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11468
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Code-barres Cote Support Localisation Section Disponibilité 008392 - Périodique Bibliothèque principale Documentaires Disponible New generation coatings need innovative raw materials / Avinash Sardesai in PAINTINDIA, Vol. LXIII, N° 2 (02/2013)
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Titre : New generation coatings need innovative raw materials Type de document : texte imprimé Auteurs : Avinash Sardesai, Auteur ; Ranjit Tambe, Auteur Année de publication : 2013 Article en page(s) : p. 55-68 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens
Boite quantiqueUne boîte quantique ou point quantique est un semi-conducteur à l'échelle naine dont les caractéristiques électroniques sont étroitement liés aux dimensions de sa forme de cristal. Un de leurs avantages principaux est leur taille hautement adaptable et donc leur haut degré d'accordabilité (tunability).
De par sa taille, il se comporte comme un puits de potentiel qui confine les électrons et les trous dans les trois dimensions de l'espace, dans une région d'une taille de l'ordre de la longueur d'onde des électrons selon de Broglie, soit quelques dizaines de nanomètres dans un semi-conducteur. Ce confinement donne aux boîtes quantiques des propriétés proches de celles d'un atome, raison pour laquelle on appelle aussi les boites quantiques atomes artificiels.
Fullerènes
GraphèneLe 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.
Liquides ioniques
Quasi-cristauxUn quasi-cristal est un solide qui possède un spectre de diffraction essentiellement discret (comme les cristaux classiques) mais dont la structure n'est pas périodique (alors que les cristaux classiques sont périodiques). Les quasi-cristaux apparaissent dans plusieurs systèmes d'alliages. Beaucoup de ces alliages sont en général thermodynamiquement instables et ne peuvent être obtenus que par refroidissement rapide : en les réchauffant à nouveau, il se transforment en cristaux conventionnels. Cependant, il existe des quasi-cristaux stables, dont certains alliages ternaires. Ceux-ci sont souvent amorphes dans une petite gamme de concentrations chimiques autour de leurs formules chimiques. L'étude des quasi-cristaux s'étend sur tous les domaines de la physique tant le caractère atypique de ces structures a une large incidence sur ses différentes propriétés physiques.Index. décimale : 667.9 Revêtements et enduits Résumé : Innovative raw materials means raw materials not used well conventionally but are known to world by recent research. The conventional raw material has been used by coating industry probably at the optimum levels to get best possible performance over a period of time. Therefore there is a I ittle scope to further exploit them for enhancing coating performance.
Coating industry is raw materials intensive one. The conventional paint properties like protection & asthetics depends on effective and judicious use of raw materials in paint formulation and their interaction. But the scenario is changed. Customer needs something more and special. To meet customer requirements and growing environment friendly requirements the old age raw materials are not sufficient. For novel paint properties we require new generation raw materials. This paper describes the use of nove) raw materials like graphene, quantum dots, quasicrystal used for enhancement of paint properties like mechanical testing, corrosion resistance, UV resistance and asthetic appeal.Note de contenu : - FULLERENE : History and naming - Types and properties of fullerene : Fullerene epoxies - Inorganic fullerene based coatings for aerospace industry - Effect of fullerenes nanofiller on corrosion activities of paint
- GRAPHENE : Properties of graphene - Using graphene in coating materials to prevent UV degradation on advanced composite materials - Graphene as anticorrosion material
- QUANTUM DOTS : Properties of quantum dots - Application of quantum dots - Quantum dots in solar paints : what if all it takes is a coat of paint to convert light energy into electricity - Quantum dots paint turns blue light of lamp into white incandescent light
- QUASICRYSTAL : Properties of quasicrystals - Polymer plus quasicrystal
- IONIC LIQUIDS : history - Properties and applications of ionic liquids - Researchers develop poly(ionic liquid) brushes grafted hybrid materials with excellent anti-bacteria and antibiofouling properties - Antimicrobial polyurethane coatings based on ionic liquids quaternary ammonium compounds.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18845
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Code-barres Cote Support Localisation Section Disponibilité 15212 - Périodique Bibliothèque principale Documentaires Disponible