hectorite clay - a unique, multi-purpose rheological additive / Wouter Ijdo in PAINTINDIA, Vol. LXI, N° 3 (03/2011)

[article]  inPAINTINDIA > Vol. LXI, N° 3 (03/2011) . - p. 48-52 Titre : hectorite clay - a unique, multi-purpose rheological additive : Part 1 - Chemistry and peoperties Type de document : texte imprimé Auteurs : Wouter Ijdo, Auteur ; Douglas N. Smith, Auteur Année de publication : 2011 Article en page(s) : p. 48-52 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Hectorite Revêtements -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Some of the earliest applications that utilize "clay" date back to antiquity. Clay tokens were used for record keeping pueposes, bricks were made from clay mud and clay pottery had a practical use as well as a decortive purpose. Other typical uses of clay minerals in ancient time were in applications such as bleaching, laundry, cosmetics, medicine, porcelain etc. Some of these uses are still relevant today. Although old, the sophisticated nature of these clay applications should not be underestimated. The ancient Maya blue pigment is perhaps a good example of early nanotechnology where clay is used to stabilize an indigo dye. An organic - inorganic surface complex is formed when indigo dye binds to the clay surface during pigment preparation. Unlike the dye alone, this combined clay-dye complex is remarkably stable and does not fade when exposed to harsh weathering conditions. Furthermore, the clay-indigo color is resistant to acids, bases, chemical solvents and does not biodegrade. Other pigment systems can be formulated for use in coatings based on such dye-clay complexes and as such might offer an environmentally friendly alternative next to pigments currently used in the coatings industry. Note de contenu : - Clay classification and properties - Hectorite geology - Platelet edge chemistry - Synthetic hectorite clays - Organoclays Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11605 [article]

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Hectorite clay - a unique, multi-purpose rheological additive. Part 2 - Applications / Douglas N. Smith in PAINTINDIA, Vol. LXI, N° 4 (04/2011)

[article]  inPAINTINDIA > Vol. LXI, N° 4 (04/2011) . - p. 51-58 Titre : Hectorite clay - a unique, multi-purpose rheological additive. Part 2 - Applications Type de document : texte imprimé Auteurs : Douglas N. Smith, Auteur ; Wouter Ijdo, Auteur Année de publication : 2011 Article en page(s) : p. 51-58 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Hectorite Revêtements -- Additifs:Peinture -- Additifs Revêtements:Peinture Rhéologie Viscoélasticité Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Rheological activity and viscoelastic properties - Natural hectorite used in waterborne decorative coatings - Hectorite-based organoclays in solventborne coatings formulations - Hectorite clay in waterborne metallic effect coatings - Natural hectorite in elastomeric roof coatings - Other applications for natural hectorite Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11663 [article]

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Next generation of thickeners in industrial coatings & construction systems / Rajni Gupta in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4644 (09/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4644 (09/2018) . - p. 16-24 Titre : Next generation of thickeners in industrial coatings & construction systems Type de document : texte imprimé Auteurs : Rajni Gupta, Auteur ; James Heck, Auteur ; Yanhui Chen ; Mihai Polverejan ; David Marsh ; Wouter Ijdo ; Carlos Feito ; Elke Piron ; Rick Lin ; Tien Hsu ; Angel Lee Année de publication : 2018 Article en page(s) : p. 16-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colles:Adhésifs Epaississants Epoxydes Formulation (Génie chimique) Huile de ricin et constituants Mélanges (chimie) Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Revêtements -- Additifs Revêtements bi-composant Rhéologie Urethanes Index. décimale : 667.9 Revêtements et enduits Résumé : The rheological properties of an industrial coating, adhesive or sealant are vital to its success. A well formulated industrial coating, adhesive or sealant has balanced rheological properties, easy but controlled application, good Sag or slump resistance and storage stability. The thickeners incorporated in the coating, adhesive or sealant formulations provide the ma nufacturers with the a bi lity to design the rheological characteristics they need fora specific end use. Organic thixotropes are castor oil or polyamide-based materials that are especially useful in systems, such as industrial coatings, construction sealants, caulks, adhesives and mastics. These additives provide outstanding efficiency for shear thinning, viscosity build, Sag control and pigment suspension. However, the high activation temperature is sometimes a deterrent for broader use. In this paper, we present a new generation of highly efficient organic thixotrope-based thickeners that can be activated at significantly lower temperatures. These new materials can be successfully incorporated in industrial coatings or sealant formulas for better viscosity build, Sag resistance and higher extrusion rates. They display a wider process window and require less energy and time in production which can result in lower costs. Note de contenu : - ADVANCING POLYAMIDE THICKENER TECHNOLOGY : Polyamide thickener goals for improvement - NEW POLYAMIDE THICKENER PERFORMANCE EXAMPLES IN INDUSTRIAL COATINGS : 90% high solids industrial 2K epoxy coating sag resistance - 77% solids industrial 2K urethane coating sag resistance - EXPERIMENTS DEMONSTRATING ACCOMPLISHMENT OF THE NEW POLYAMIDE THICKENER GOALS : Low temp and moderate mixing speed : 85°F mixing of a 77% solids industrial 2K urethane coating - Low temp and very low mixing speed : 85°F mixing of a 90% solids industrial 2K epoxy coating - 100% SOLIDS ADHESIVE -EFFECTIVENESS OF NEW POLYAMIDES IN MS POLYMER FORMULATION - Fig. 1 : Schematic of hydrogenation of castor oil to produce a castor wax - Fig. 2 : Diagram of castor wax based organic thickener material changes occurring during the coating preparation mixing process - Fig. 3 : Generic molecular structure of a polyamide organic thickener - Fig. 4 : A) possible hydrogen bonds between molecules of polyamide thickeners ; B) an SEM micrograph of a collection of polyamide fibrils En ligne : https://drive.google.com/file/d/1HrxDdxfAflFWJOYvJs31qRJLXsBQfxbQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31020 [article]

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