Best pigment coating for a dual-purpose coated paper / Jae Y. Shin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1281-1294 Titre : Best pigment coating for a dual-purpose coated paper Type de document : texte imprimé Auteurs : Jae Y. Shin, Auteur ; Paul D. Fleming, Auteur ; Hak Lae Lee, Auteur Année de publication : 2021 Article en page(s) : p. 1281-1294 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Emballages Formes des particules Impression jet d'encre Latex Liants Offset (imprimerie) Papier et carton couché Perméabilité Pigments Index. décimale : 667.9 Revêtements et enduits Résumé : Dual-purpose coated paper, which enables in-line inkjet printing with web offset, can be used for both offset and inkjet prints. This product has potential to meet the ever-increasing demand for printing individualized information on commercial printing materials. In this work, commercial samples were printed in the two presses. It was deduced that low permeability correlates with large color gamut volume. The correlation would be useful to design coating formulations for good printability. Also, we examined the packing of coating layers to identify a coating formulation that provides good printing quality in both offset and inkjet printing. Many combinations of pigments were tested, and the effects of particle shape on viscosity and packing were examined. For all coating colors, pigment mixtures with a weight ratio of 3:1 gave the highest packing density. The mixture of GCC 90 and delaminated clay with a weight ratio of 3:1 was the best selection studied for dual-purpose coated paper. Among commercial paper samples, a web offset coated paper showed the best overall performance, indicating that coating formulations with minimal blistering are suitable for dual-purpose coated paper. Note de contenu : - MATERIALS AND METHODS : Commercial coated papers - Permeability (K) of commercial papers - Pigments and a binder latex - Coating formulations for dual-purpose coated paper - Field-emission scanning electron microscopy images of pigments and coated papers, and paper testing - Color reproduction - Coating color properties - The application of packing theory to paper coating - RESULTS AND DISCUSSION : Trials of precommercial dual-purpose coated papers - Effect of particle shape on viscosity - Effect of particle shape on packing - Correlation between packing volume and surface properties - Table 1 Physical properties of commercial coated papers for offset, inkjet, and dual-purpose printing - Table 2 Characteristics of coating pigments and a binder latex - Table 3 Color gamut volumes and four-color optical ink densities of commercial coated papers - Table 4 Packing volume fractions of pigment-only dispersions and pigment–latex dispersions. Calcium carbonates and clays are assumed to have an equal density of 2.7 g/m3 so that weight (λw) and volume (λv) ratios are the same in pigment-only dispersions DOI : https://doi.org/10.1007/s11998-021-00491-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00491-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36432 [article]

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Effect of particle shape on the wear and friction behavior of particle-reinforced epoxy coatings / Kenan Cinar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1435-1445 Titre : Effect of particle shape on the wear and friction behavior of particle-reinforced epoxy coatings Type de document : texte imprimé Auteurs : Kenan Cinar, Auteur ; S. Ozmen Eruslu, Auteur ; I. Savas Dalmis, Auteur ; Ibrahim Guven, Auteur Année de publication : 2019 Article en page(s) : p. 1435-1445 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Epoxydes Formes des particules Frottements (mécanique) Particules (matières) Polymères -- Détérioration Revêtements organiques Tomographie à rayons X Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy coatings are increasingly becoming popular choices as barriers against acids and alkali for protection of concrete and metal products. In applications, metal containers are often coated with epoxy-based coatings to prevent rusting and corrosion. In this study, an experimental examination was carried out to investigate the effect of particle shape and size on the friction and wear behavior of epoxy coatings. Friction and wear experiments were conducted using a pin-on-disk tribometer. Epoxy resin was filled with four different shapes of glass particles (spherical, flake, rod, and irregular shape) and varying particle sizes. Fillers were settled down and filler surface area fraction through thickness was characterized using microcomputed tomography (micro-CT). The wear mechanisms such as matrix wear, matrix cracking, particle fracture, particle debonding, and pullout and debris formation were studied using scanning electron microscopy. According to observations, it was found that particle shape has an effect on the wear characteristic. Particle fracture and particle pullout mainly dominated the wear in the samples of flake- and rod-shaped fillers, perpendicular matrix cracks occurred in the samples of spherical fillers, large debonding at the particle–matrix interface without particle pullout occurred in the samples of large irregular-shaped fillers (75–150 µm), and matrix cracks dominated the wear as the size of irregular-shaped fillers decreased to 50–75 µm. Further, it was found that friction coefficient depends on the shape of the particle. The samples with spherical- and irregular-shaped fillers had higher friction coefficient as compared to the samples with flake and rod fillers. Note de contenu : - MATERIALS AND EXPERIMENTAL PROCEDURES : Materials and manufacturing - Microcomputed tomography imaging - Wear and friction tests - RESULTS AND DISCUSSION : Coefficient of friction - Weight loss - Wear mechanisms and morphology of the worn surfaces DOI : 10.1007/s11998-019-00228-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00228-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33023 [article]

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Effect of particle size of extenders in water based paints - a critical view / M. Veeramani in PAINTINDIA, Vol. LXIX, N° 11 (11/2019)  

[article]  inPAINTINDIA > Vol. LXIX, N° 11 (11/2019) . - p. 112-118 Titre : Effect of particle size of extenders in water based paints - a critical view Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2019 Article en page(s) : p. 112-118 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Diluants Dioxyde de titane Floculant Formes des particules Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Taille des particules Index. décimale : 667.9 Revêtements et enduits Résumé : Extenders or fillers form the bulk of the paints. I had dealt with this subject earlier under the heading extenders with sufficient introduction, followed by individual description of various extenders and the critical role played by it in the paint of each extenders and the critical role played by it in the paint matrix, if the particle size of the extenders is reduced to a great extent. Now let me recall some of the salient features, in brief, of extenders. Readers may find some repetition from the earlier chapter ; it is only for the purpose of recalling the same for better continuity and also note that extenders are also known as extender pigments also. Note de contenu : - Extender pigments - the forgotten component - Improving TiO2 use through spacing - PVC ladder with varying extender volume concentration - Extender flocculating performs worse - Extender with air voids improves opacity - TiO2 reductions of 20% are possible - Fig. 1 : Reducing extender particle - Improving pigment spacing/dispersion - Fig. 2 : Opacity curves showing crowding effect - Fig. 3 : Reducing TiO2 content using extender E : effect on contrast ratio and effect on equivalent reflectance - Fig. 4 : Effect of extender particle size and shape in gloss En ligne : https://drive.google.com/file/d/1ICUyqzH6irq2OxXEsJctGXW6KKEei_i9/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33637 [article]

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Optical properties of polymer-based coatings containing metallic particles : effect of particle shape and binder / Kuilong Song in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1611-1619 Titre : Optical properties of polymer-based coatings containing metallic particles : effect of particle shape and binder Type de document : texte imprimé Auteurs : Kuilong Song, Auteur ; Ming Xie, Auteur ; Qing Ai, Auteur Année de publication : 2023 Article en page(s) : p. 1611-1619 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Emissivité En transfert radiatif, l'émissivité correspond au flux radiatif du rayonnement thermique émis par un élément de surface à température donnée, rapporté à la valeur de référence qu’est le flux émis par un corps noir à cette même température. Cette dernière valeur étant la valeur maximale possible, l'émissivité est un nombre inférieur ou égal à l'unité. (widipedia) Formes des particules Liants Monte-Carlo, Méthode de Particules (matières) Particules métalliques Polyacryliques Polyéther imide Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Polystyrène Revêtements -- Propriétés optiques Revêtements organiques Topologie Transfert radiatif Index. décimale : 667.9 Revêtements et enduits Résumé : Polymer-based coatings containing metallic microparticles are a kind of functional material with effective spectral selectivity. The spectral radiative transfer model of polymer-based coatings is built based on geometrical optics, and the spectral radiative characteristics of the coatings were investigated by Monte Carlo ray-tracing method. The coatings consist of aluminum particles with different shapes as fillers and four kinds of polymer resins as binders, respectively. After verifying the reliability of the method, the effect of particle shape and binder on the infrared emission properties in the range of 8–14 μm is systematically investigated. The results demonstrate that adding flake particles into the coating can obtain lowest infrared emissivity, which is at most 86.79% lower than the coating containing spherical particles when the volume fraction is 30%. The mean emissivity of Al/acrylic resin, Al/polyetherimide (PEI), Al/polymethyl methacrylate, and Al/polystyrene (PS) composite coatings is 0.46, 0.48, 0.41, and 0.22, respectively. Al/PS composite coating has the minimum mean infrared emissivity among these four kinds of polymer-based coatings, which is 54.2% lower than Al/PEI composite coating. The method proposed in this work will provide theoretical guidance for experimental research. Note de contenu : - METHOD : Radiative transfer model - Random geometry topology structure - RESULTS AND DISCUSSION : Validation - Influence of particle shape on emission spectrum - Influence of binder on emission spectrum DOI : https://doi.org/10.1007/s11998-023-00766-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00766-7.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39975 [article]

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The influence of different shapes and size distributions of coating pigments on packing and dewatering / Jae Y. Shin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1425–1436 Titre : The influence of different shapes and size distributions of coating pigments on packing and dewatering Type de document : texte imprimé Auteurs : Jae Y. Shin, Auteur ; Hak Lae Lee, Auteur Année de publication : 2020 Article en page(s) : p. 1425–1436 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Déshydratation Dispersions et suspensions Emballages Formes des particules Granulométrie Papier et carton couché Pigments Revêtements Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Particle shape and particle-size distribution (PSD) are important factors for pigment packing and water retention in the pigment coating process, being closely associated with many runnability problems. Diverse experimental investigations on the packing and dewatering of pigment slurries have been made. However, theoretical approaches remain lacking. This paper presents a joint experimental and theoretical analysis of the influence of pigment shape and PSD on pigment packing and dewatering. The relative viscosities of very dilute pigment slurries were measured and used to determine the intrinsic viscosity, based on the Einstein equation. The deviation of pigment shape from spherical caused an increase in viscosity of the slurries. Acicular precipitated calcium carbonates gave lower shape factor values than platy clay particles, which indicated that the needle-like particles could rotate more easily around their long axes under shearing conditions. The packing of pigments, which determines porosity, permeability, light scattering, and mechanical properties, was examined. The packing volumes of nonspherical pigments were estimated based on their respective PSDs, using an algorithm developed for spherical particles, modified with a correction factor. This model is based on the close random-packing volume fraction (∅2p) of particles of uniform size being an independent variable, regardless of their shape. Therefore, it was valid as long as the particles always achieve the same close random-packing volume (∅1p) by sedimentation or tapping. Overall, the effect of the particle shape and PSD on the dewatering and filter-cake permeability (Kf) was analyzed. The dewatering rates were measured with a common pressure filtration method, and the permeability of the filter cakes was obtained by fitting the data to a filtration equation. The particle size and PSD were found to influence the permeability constant, but there was little correlation between the permeability and particle shape. Note de contenu : - MATERIALS AND METHODS : Particle size distribution of pigments and SEM images - Characterization of pigments by viscosity measurement - Sedimentation volume of dispersion - Dewatering rate - THEORY AND CALCULATION : Model development - New approach - RESULTS AND DISCUSSION : Particle-size distribution of pigments - Effect of electrolyte on viscosity - Aspect ratio of pigment particles - Sedimentation volume of dispersion by centrifugation - Packing volume fractions of nonspherical particles - Dewatering and permeability of filter cake DOI : https://doi.org/10.1007/s11998-020-00371-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00371-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34949 [article]

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Wood-polypropylene composites : influence of processing on the particle shape and size in correlation with the mechanical properties using dynamic image analysis / P. Sälzer in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 5 (11/2018)  

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