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Abrasion characteristics of ground calcium carbonate products / Lane Shaw in COATINGS WORLD, Vol. 23, N° 9 (09/2018)
[article]
Titre : Abrasion characteristics of ground calcium carbonate products Type de document : texte imprimé Auteurs : Lane Shaw, Auteur ; David Yu, Auteur Année de publication : 2018 Langues : Américain (ame) Catégories : Abrasion
Carbonate de calcium broyé
Dureté (matériaux)
Granulométrie
Micrographie
Morphologie (matériaux)Index. décimale : 667.9 Revêtements et enduits Résumé : When evaluating the abrasion characteristics of a naturally occurring mineral, one must take into consideration both the abrasivity of the mineral and of the impurities. Abrasion is a function of concentration, hardness and particle size of the material and/or impurity. A mineral with a high concentration of a hard impurity is not necessarily more abrasive. It is also highly dependent on the particle size of the impurity. Note de contenu : - GCC and abrasivity
- Morphology
- Photo 1 : Pin-modified rotor
- Fig. 1 : Hardness scales
- Fig. 2 : Acid insoluble weight percent of various 3 µm calcium carbonate grades
- Fig. 3 : Abrasion comparison of 3 µm and 20 µm dry ground calcium carbonates
- Fig. 4 : Abrasion comparison of 3 µm products
- Fig. 5 : Particle sizes of acid insoluble silica fractions
- Fig. 6 : Micrographs of 20 µm and 3 µm acid insoluble fractions from Marble Hill, GA marble and Marble Falls, TX limestone. These photos are the acid insolubles (silica and silicate) composition of the calcium carbonate ore source
- Fig. 7 : Statistical correlation for acid insoluble amount and particle sizeEn ligne : https://www.coatingsworld.com/issues/2018-09-01/view_features/abrasion-character [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32515
in COATINGS WORLD > Vol. 23, N° 9 (09/2018)[article]Effect of particle size distribution on stress development and microstructure of particulate coatings / Yan Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)
[article]
Titre : Effect of particle size distribution on stress development and microstructure of particulate coatings Type de document : texte imprimé Auteurs : Yan Wu, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2017 Article en page(s) : p. 455–465 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonate de calcium broyé
Copolymère styrène acrylate
Dispersions et suspensions
Granulométrie
Latex
Liants
Microstructures -- Analyse
Particules (matières)
Revêtement -- SéchageIndex. décimale : 667.9 Revêtements et enduits Résumé : The role of pigment particle size distribution on stress and microstructure development was studied for coatings prepared from aqueous suspensions of ground calcium carbonate (GCC) and latex binder. Stress development was monitored using a modified beam deflection technique under controlled environment. Microstructure was characterized by scanning electron microscopy (SEM) and cryogenic SEM. For coatings containing only GCC particles and no latex, a wide particle size distribution resulted in a significant particle size gradient in the cross-sectional microstructure and irregular stress development. With latex addition, uniform microstructures were observed in coatings with either wide or narrow GCC particle size distribution. GCC/latex coatings prepared using GCC with a wide particle size distribution developed a higher stress than those prepared using GCC with a similar average particle size but a narrow particle size distribution. The higher stress is related to the particle packing that results in smaller pore sizes and larger capillary pressures that drive compaction. In coatings prepared with the same GCC particles but different latex binders, the stress and cracking behavior of the coating depends on the latex properties. Note de contenu : - MATERIALS AND METHODS : Suspension systems - Drying stress measurement - Microstructure characterization
- RESULTS AND DISCUSSION : Coatings prepared from GCC suspensions - Coatings prepared with GGC and styrene acrylate latex - Coatings prepared with GCC-W and different types of latexDOI : 10.1007/s11998-016-9866-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9866-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28160
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 455–465[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18781 - Périodique Bibliothèque principale Documentaires Disponible
[article]
Titre : Extenders - Calcium carbonate Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2015 Article en page(s) : p. 100-104 Langues : Anglais (eng) Catégories : Carbonate de calcium broyé
Carbonate de calcium précipité
Carbonate de calciumLe carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole.
C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots.
Charges (matériaux)
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : We now go to the next Extender viz : calcium carbonate in detail. Semi-gloss emulsion paints are formulated well below the CPVC. Under these conditions there is no "dry hiding effect" from the pigment and extenders, and relatively high levels of TiO2 pigment. In addition to the prime color pigments described above, decorative coatings and stains also contain filler or extender pigments, such as ground calcium carbonate (GCC), talc and kaolin. The key function of these minerals is to lower costs by either extending or maximizing the efficiency of the more costly color pigments, reducing the amounts needed to achieve the desired color, and filling up the volume in the paint, thus reducing the use of resins and/or solvents. In choosing a filler pigment, both the demands of the end use and the cost constraints (i.e. selling price) must be considered. The performance of a given filler in a coating depends on its basic chemical nature, as well as its particle size, particle shape, surface chemistry, color, and whiteness or brightness (both dry and wet). Most decorative coatings contain a combination of filler minerals of different types and sizes to achieve the targeted balance of application, appearance, durability, and cost properties. Note de contenu : - Ultra fine ground calcium carbonate for high gloss paints
- How is precipitated calcium (PCC) made ?
- What is precipitated calcium carbonate (PCC) made from ?
- Why is all the processing done ?
- How does precipitated calcium carbonate differ from ground calcium carbonate (GCC) ?En ligne : https://drive.google.com/file/d/1k-kPxXGFhiCaT6It9pRxEsy9iNrH5FFJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25270
in PAINTINDIA > Vol. LXV, N° 11 (11/2015) . - p. 100-104[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17756 - Périodique Bibliothèque principale Documentaires Disponible Influence of particle size distribution of calcium carbonate pigments on coated paper whiteness / Nitin Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)
[article]
Titre : Influence of particle size distribution of calcium carbonate pigments on coated paper whiteness Type de document : texte imprimé Auteurs : Nitin Kumar, Auteur ; Nishi Kant Bhardwaj, Auteur ; Swapan Kumar Chakrabarti, Auteur Année de publication : 2011 Article en page(s) : p. 613-618 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonate de calcium broyé
Carbonate de calcium précipité
Lumière -- Diffusion
Opacifiants
Papier enduit
Pigments inorganiques
Taille des particulesIndex. décimale : 667.9 Revêtements et enduits Résumé : The optical properties of pigments used for paper coating are linked to their morphology. The light scattering through coated layers depends upon the size and the size distribution of the pigments and their packing behavior. In this report the effect of particle packing of various calcium carbonate pigments on the whiteness of the final coated paper is studied. Different grades of calcium carbonate pigments of different particle size distribution and optics were used for coating applications on base papers. Base papers of different optics were also selected. The entire study was carried out at different coat weights. It was observed that the overall scattering from the coated sheet depends upon the light scattering from the base paper as well as through the coated layer. Higher light scattering through the coated layer will lower the effect of the base paper, whether it is dark or bright. So high bright and white pigments are not only the criteria for an enhancement in the optical properties of coated paper ; the particle size and size distribution should also be considered before introducing any pigment into a coating formulation. The base optics should also be chosen on the bases of the pigments’ optics and their morphology. Note de contenu : EXPERIMENTAL : Materials - Coating color preparation - Paper coating application - Analytical techniques.
RESULTS AND DISCUSSION : Effect of pigment particle size distribution on coated paper whiteness before calendering - Effect of pigment particle size distribution on coated paper whiteness after calendering.DOI : 10.1007/s11998-011-9353-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9353-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12237
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 613-618[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13360 - Périodique Bibliothèque principale Documentaires Disponible Influence of pigment blends of different shapes and size distributions on coated paper properties / Nitin Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)
[article]
Titre : Influence of pigment blends of different shapes and size distributions on coated paper properties Type de document : texte imprimé Auteurs : Nitin Kumar, Auteur ; Nishi Kant Bhardwaj, Auteur ; Swapan Kumar Chakrabarti, Auteur Année de publication : 2011 Article en page(s) : p. 605-611 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique)
Carbonate de calcium broyé
Carbonate de calcium précipité
Lumière -- Diffusion
Matériaux poreux
Opacifiants
Papier enduit
Pigments inorganiques
Résistance à l'arrachement
RugositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Paper coating pigment plays an essential role in the achievement of the desired end paper qualities. Different pigment varieties are available for paper coating. Ground calcium carbonate (GCC) is the major one used frequently in coating formulations. Precipitated calcium carbonate (PCC) is gradually gaining importance in paper coating, as it can be prepared in different shapes and sizes. The present study was carried out to determine the influence of PCC pigments with different shapes and sizes on paper properties, and their limitations and advantages when blended with finer grade GCC. PCC pigments of calcite and aragonite crystalline polymorphs having rhombohedral, orthorhombic, and scalenohedral habits were selected for the study. It was observed that the viscosity and water-holding capacity of the coating color was reduced with the introduction of PCC in the coating formulation. The PCC pigments showed greater light scattering, opacity, and smoothness of the coated paper as compared to the GCC pigment. The clustered (rosette) shape of scalenohedral habit calcite PCC results in the greatest light scattering, opacity, and surface strength amongst all PCCs. The aragonite PCC of orthorhombic habit and calcite PCC of rhombohedral habit show an almost similar trend in coated paper properties with the greatest smoothness and paper gloss. Note de contenu : EXPERIMENTAL : Materials - Coating color preparation - paper coating aplication - Methods.
RESULTS AND DISCUSSION : Characteristics I : properties that respond the same to all the PCCs tested - Characteristics II : properties that have a mixed response to the PCC tested.DOI : 10.1007/s11998-011-9354-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9354-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12236
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 605-611[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13360 - Périodique Bibliothèque principale Documentaires Disponible