Calcium carbonates - revisited / Petra Fritzen in EUROPEAN COATINGS JOURNAL (ECJ), N° 5 (05/2015)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 5 (05/2015) . - p. 30-33 Titre : Calcium carbonates - revisited : A new generation of precipitated calcium carbonate for paints Type de document : texte imprimé Auteurs : Petra Fritzen, Auteur Année de publication : 2015 Article en page(s) : p. 30-33 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbonate de calcium précipité Charges (matériaux) Dioxyde de titane -- Suppression ou remplacement Morphologie (matériaux) Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : When developing a new paint formulation, of key importance are the optical (brightness and opacity) and mechanical (wet scrub resistance and cracking) characteristics of the paint, as well as the cost control in the selection of raw materials. Furthermore, sustainability is becoming increasingly important. These parameters are significantly influenced by the amount of titanium dioxide, the type of filler, the composition of the filler package and the pigment volume concentation. Note de contenu : - Precipitated calcium carbonate- a new substance ? - Dry hiding and the extender effect - The role of morphology - How does it work in emulsion paint ? - Efficient replacement of titanium dioxide - Mechanical properties - Preparation, application and test procedures - Unique morphology for effective titanium dioxide substitution En ligne : https://drive.google.com/file/d/1Jyd1l8BfL4QoKG4DNqRNyJNNe4o8s_s-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24039 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
17212	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Extenders - Calcium carbonate / M. Veeramani in PAINTINDIA, Vol. LXV, N° 11 (11/2015)  

[article]  inPAINTINDIA > Vol. LXV, N° 11 (11/2015) . - p. 100-104 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 calcium Le 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 -- Additifs Index. 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25270 [article]

Réservation

Réserver ce document

Exemplaires (1)

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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 613-618 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 particules Index. 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12237 [article]

Réservation

Réserver ce document

Exemplaires (1)

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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 605-611 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 Rugosité Index. 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12236 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
13360	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Opaque extenders as a partial replacement to TiO2 / Monika Deshmukh in PAINTINDIA, Vol. LXVII, N° 7 (07/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 7 (07/2017) . - p. 72-81 Titre : Opaque extenders as a partial replacement to TiO2 Type de document : texte imprimé Auteurs : Monika Deshmukh, Auteur ; Vishwanath Patil, Auteur Année de publication : 2017 Article en page(s) : p. 72-81 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Carbonate de calcium précipité Chlorure de polyvinyle Dioxyde de titane -- Suppression ou remplacement Pigments inorganiques Polyalkydes Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Silicate d'aluminium Silicate de calcium Index. décimale : 667.9 Revêtements et enduits Résumé : The growing demand and increasing Cost:of TiO2 has driven the attention of paint technologists to search for other alternatives.Titanium dioxide pigments provide both opacity and whiteness to paint films and influence a wide range of Other film. The introduction and development of TIO, throughoutthe 20th century enabled the production of high-quality and safe paints for both interior and exterior use. However, the manufacturing processes of TiO2 are relatively expensive, and so this pigment is often the most expensive raw material used in emulsion paints. Many techniques andadditives has been developed over the years to help improve the utilization of TiO2 and thus recduce the amount used, while rnairitaining paint performance properties. There has been contintious effort to replace part of the TiO2 with fine particle site extenders in paint formulations. A detailed study has been undertaken to replace pigment by various percentages of calcined clays ; kaolin, PCC (precipitated calcium carbonate), Calcium aluminium silicate in to latex paint formulations. Properties such as thixotropie hiding power, light fastness, film brightness, scrub resistance, and weather resistance have been deterrnined to establish the optimum use of these extenders in the paint formulation. Note de contenu : - INTRODUCTION : Sulfate process - Chloride process - THE NEED FOR TITANIUM DIOXIDE (TiO2) replacement : Market growth - External influences - Lifetime quality - Price - Possible reactions - Resource availability - Looking ahead - ALTERNATIVES - SUPER MICROVOID CALCINED CLAY (SMCC) : Properties of super microvoid calcined clay - Effect on opacity - Properties on the critical PVC - Example 1 : saving titanium dioxide in an alky dundercoat - Example 2 : saving titanium dioxide in matt interior emulsion paint - CALCIUM ALUMINIUM SILICATE AS A PARTIAL REPLACEMENT TO TIO2 : Properties of CAS - Example - RESULTS : Optical properties - Opacity - Class - Whiteness index - Other properties - KAOLIN - REPLACEMENT OF TIO2 WITH PCC (PRECIPITATED CALCIUM CARBONATE) : Properties of PCC - Example - RESULTS : Opacity - Scrub resistance - Other properties - NOVEL SILICA-BASED NANO PIGMENTS - RESULTS : Gloss - Brightness - Opacity En ligne : https://drive.google.com/file/d/1jkxCaj3qmMp22eJFXR5uNcP7uo-hY3Pz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28973 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
19146	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Precipitated calcium carbonate's particle size, surface treatment affect sealant rheology / Joanne C. Armstead in ADHESIVES AGE, Vol. 40, N° 8 (07/1997)  

Permalink

---

1 (1 - 6 / 6)