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Degradation and stability of polymers in presence of titanium dioxide / Zeba Fahreen in PAINTINDIA, Vol. LVI, N° 1 (01/2006)
[article]
Titre : Degradation and stability of polymers in presence of titanium dioxide Type de document : texte imprimé Auteurs : Zeba Fahreen, Auteur ; Vinod C. Malshe, Auteur Année de publication : 2006 Article en page(s) : p. 49-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine
Dioxyde de titane
Photocatalyse
Polymères -- Détérioration
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 667.9 Revêtements et enduits Résumé : TiO2 is one of the most widely used opacifier for paint and polymers. The semiconductor like band structure of TiO2 imparts properties like UV absorption as well as photosensitizing propertíes. Lot of research has been done on the photocatalytic activity of TiO2. It has been proved that TiO2 degrades most of the organics leading to complete mineralization into water and carbon dioxide. Similar degradation is also expected in polymers. Moreover, TiO2 not only degrades the polymer but also hampers the activity of the other additives present. This photocatalytic activity depends on many parameters like the type of molecule, the crystal structure and particle size of TiO2 etc. This activity of TiO2 can be curbed by coating it with silica, alumina etc. Thus, coated nanosized rutile form of TiO2 can act as a transparent UV block. Moreover, TiO2 may be used for the degradation of polymeric waste as it gives environmentally benign products. This may have potential to solve the problem of plastic waste disposal. Note de contenu : - Titanium dioxide
- Photocatalic activity of titanium dioxide
- Degradation of molecules by TiO2
- TiO2 in polymers
- Nano TiO2 : Novel approach to UV stabilization of polymers
- Relative activity of TiO2 particles (coated and uncoated)Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11539
in PAINTINDIA > Vol. LVI, N° 1 (01/2006) . - p. 49-62[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 004700 - Périodique Bibliothèque principale Documentaires Disponible Dependent light scattering in white paint films : clarification and application of the theoretical concepts / J.-C. Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)
[article]
Titre : Dependent light scattering in white paint films : clarification and application of the theoretical concepts Type de document : texte imprimé Auteurs : J.-C. Auger, Auteur ; Brian Stout, Auteur Année de publication : 2012 Article en page(s) : p. 287-295 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane
Lumière -- Diffusion
Pigments inorganiques
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : Among the numerous publications analyzing the causes and consequences of titanium dioxide crowding on the optical properties of white paint films, one notes some inconsistencies. First, a significant number of studies are inclined to describe “dependent” and “multiple” scattering of light as distinct phenomena. Second, the transition from independent to dependent light-scattering is often associated with an ill-defined “threshold” concentration. The aim of this study is to clarify the intricate connections between these two scattering regimes and in particular to show that for white paint films loaded with rutile titanium dioxide pigments, “dependent” light scattering is merely a particular manifestation of multiple scattering processes. We also clarify that the transition from independent to dependent scattering is a continuous process that cannot be formally related to a specific threshold in the pigment volume concentration. Finally, we propose a simple method based on the dependent scattering amplitude to assist paint formulators facing the task of improving the hiding power of a white paint either by increasing the quantity of pigments or by improving their spatial state of dispersion. Note de contenu : - STUDY OF ELECTROMAGNETIC COUPLINGS INVOLVED IN LIGHT-SCATTERING PROCESSES BETWEEN TIO2 PIGMENTS : Previous clafirication - Review of the light propagation models in heterogeneous media - Charaterization of the single-to-multiple scattering transitions - Characterization of the independent-to-dependent scattering transition - Far-field coherent scattering - Evidence of far-field coherent scattering vs near-field interaction via numerical simulations - Partial conclusions
- STUDY OF THE DEPENDENT LIGHT-SCATTERING TRANSITION : Description and characterization of dependent scattering transition - Characterization of dependent light-scattering amplitude
- PRACTICAL APPLICATIONDOI : 10.1007/s11998-011-9371-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9371-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15953
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 287-295[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14188 - Périodique Bibliothèque principale Documentaires Disponible Design of pigment dispersants for high-performance applications / Andrew Shooter in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4644 (09/2018)
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Titre : Design of pigment dispersants for high-performance applications Type de document : texte imprimé Auteurs : Andrew Shooter, Auteur ; Tom Annable, Auteur ; Stuart Richards Année de publication : 2018 Article en page(s) : p. 26-30 Langues : Anglais (eng) Catégories : Agents dispersants (chimie)
Anticorrosifs
Anticorrosion
Dioxyde de titane
Dispersions et suspensions
Epoxydes
Essais accélérés (technologie)
Essais de résilience
Oxyde de fer
Pigments inorganiques
Revêtements bi-composant
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : With increasing regulatory and environmental requirements, there is a drive towards developing water-based VOC free pigmented coating formulations with the same aesthetic properties as solvent-based systems. The pigment dispersant in addition to providing fast wetting and desirable colouristic effects will also impact the overall durability of the coating. Novel anchor groups have enabled us to design improved dispersants, which can be formulated into coatings with superior jetness and colour strength. These dispersants can reduce the particle size in much less time than conventional dispersants using less energy during the milling process while providing the required stability and compatibility in the coating formulation. In addition, through efficiency in design coupled with judicious selection of stabilising chains, the dispersant can be optimised to minimise its impact on water sensitivity and corrosion resistance.
After proving that these principles deliver superior dispersants on organic pigments and carbon black, our recent focus has been to deliver the same benefits on high end inorganic pigments for industrial applications, such as transparent iron oxides. In this paper, we will discuss these design principles and show how this has translated into superior performance in waterborne industrial coatings.Note de contenu : - Dispersion of transparent iron oxides
- Dispersion of titanium dioxide
- FIGURES : 1. Optimising the dosage of a dispersant and the relationship to flocculation - 2. Classification of dispersants - 3. Dispersion of high surface area carbon black pigment with SA dispersant - 4. Developing an effective MA dispersant and impact on millbase viscosity - 4A : Carbon black dispersion gloss and colour strength when let down into an industrial white base - 4B. Pigment yellow 42 gloss and colour strength when let down into an industrial white base - 5. SEM images of transparent iron oxides. Yellow iron oxide and red - 6. Millbase viscosity and particle size at different concentrations of transparent iron oxide - 7. Transparent iron oxide millbase viscosity and particle size at different loadings of dispersant - 8. Opacity of yellow iron oxide dispersions in an automotive clear coat vs milling time - 9. Particle size distributions of pigment dispersion during the milling process - 10. Relationship between particle size and opacity for yellow iron oxide dispersion - 11. Dispersion of TiO2 with MA dispersant vs competitive controls - 12. Performance of MA dispersant on TiO2 pigments - 13. Top : Corrosion testing of TiO2 dispersion in acrylic coating. Corrosion testing of titanium dioxide dispersion in 2K epoxy coatingEn ligne : https://drive.google.com/file/d/1LK7BYCe6RuKv0-sshcv8uZlAneuTPHTl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31021
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4644 (09/2018) . - p. 26-30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20192 - Périodique Bibliothèque principale Documentaires Disponible Designing self-stratify coatings based on epoxy-PU systems containing three pigments / Shahdad Zahedi in SURFACE COATINGS INTERNATIONAL, Vol. 103.5 (09-10/2020)
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Titre : Designing self-stratify coatings based on epoxy-PU systems containing three pigments Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Seyed Reza Ghaffarian, Auteur Année de publication : 2020 Article en page(s) : p. 268-273 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Caractérisation
Copolymère uréthane époxy
Dioxyde de titane
Formulation (Génie chimique)
Oxyde de fer micacé
Pigments
Revêtement en phase solvant
Revêtements autostratifiants
Verre -- Revêtements
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : A self-stratifying coating contains at least two resins of different natures, which spontaneously stratify after application on a substrate. Various self-stratifying systems have been reported in the literature, but self-stratifying coatings containing three pigments have rarely been discussed. In this paper, a series of self-stratifying coatings based on an epoxy-PU system and containing three pigments, i.e. zinc dust, micaceous iron oxide (MIO) and titanium dioxide (TiO2) were prepared and applied on glass plates. Stratification was studied and evaluated by Fourier Transform Infrared Spectroscopy using Attenuated Total Reflectance (FTIR-ATR) on both sides of the films. Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDX) analyses and mappings with line scans from cross-sections of the films were carried out to characterise the degree of stratification and the location of the pigments. The aim of this research is to study the factors that affect stratification and the location of the pigments in self-stratifying coatings containing three pigments, and leading to the design of a three-layered self-stratifying epoxy-PU anti-corrosive coating system. It was found that a higher solid percent of epoxy resin has a positive effect on stratification and pigment location. It was also found that better stratification was obtained by replacing some of the xylene in a formulation with a solvent with a higher evaporation rate (butyl acetate). Note de contenu : - EXPERIMENTAL : Materials - Coatings formulation
- RESULTS AND DISCUSSION : FTIR-ATR results - SEM/mapping results
- Fig. 2 : SEM/mapping images, F5-F7 formulas
- Fig. 3 : Line scans for films of 5, F6 and F7 formulations
- Fig. 4 : Liquid formulations F3, F4 and F7 in clear bottles after 72 hours storage
- Table 1 : Prepared formulations
- Table 2 : Weight percentage of elements in the top and bottom areas in the film cross-sections for F5, F6 and F7 formulations by EDXEn ligne : https://drive.google.com/file/d/16cUOIqMPjQJs10ysmgZdKtqQZkXPdmnw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34728
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Code-barres Cote Support Localisation Section Disponibilité 22306 - Périodique Bibliothèque principale Documentaires Disponible Designing self-stratifying coatings through the study of pigment migration / Shahdad Zahedi in SURFACE COATINGS INTERNATIONAL, Vol. 101.6 (12/2018 - 01/2019)
[article]
Titre : Designing self-stratifying coatings through the study of pigment migration Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Davood Zaarei, Auteur ; Seyed Reza Ghaffarian, Auteur ; Maude Jimenez, Auteur Année de publication : 2018 Article en page(s) : p. 288-293 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact
Dioxyde de titane
Energie de surface
Epoxydes
Formulation (Génie chimique)
Oxyde de fer
Pigments inorganiques
Revêtements autostratifiantsIndex. décimale : 667.9 Revêtements et enduits Résumé : Self-stratifying coatings are smart coatings which represent a new generation of surface coatings for industry which offer the advantages of single-coat application, thereby reducing resources and potential pollution when compared to conventinal multi-layer coating systems.
In our work, the effect of pigments on stratification was studied. Ten formulations were made based on epoxy and fluorinated vinyl ether incorporation of inorganic pigments containing titanium dioxide and red iron oxide. Evaluations were made by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX) and mapping from cross-sections through the films. Results demonstrate that the affinity of the pigments for different resins, and also the quality of their dispersion and stabilisation in the initial phase, both play important roles in the stratification phenomena.Note de contenu : - Materials
- Formulation and application
- Results and discussion : Stratification of clear coatings - Stratification of single-pigment coatings - Stratification of dual-pigment coatings
- Table 1 : Prepared formulations
- Table 2 : Percentage of elements in top and bottom areas in cross-section of clear coating formulation (Formula 3) by EDX
- Table 3 : Percentage of elements in top and bottom areas in cross-section of single-pigment formulations 4, 5, 7 and 8 by EDX
- Table 4 : Stratification type by formulation
- Table 5 : Percentage of elements in top and bottom areas in cross-section of single-pigment formulations 6, 9 and 10 by EDX
- Table 6 : Contact angle measurement and surface energies (polar and dispersive components) of films by using three liquids (water, ethylene glycol and di-iodomethane)
- Table 7 : Surface energy relations and stratification conditions
- Fig. 1 : SEM and mapping images for SSC clear coating system (formula 3)
- Fig. 2 : SEM and mapping images for single-pigment systems (formulations, 4, 5, 7 and 8)
- Fig. 3 : SEM and mapping images for dual-pigment systems (formulations 6, 9, and 10)En ligne : https://drive.google.com/file/d/11o-EpvH5VXJK-GS1nC5NArN3pTtgN975/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31651
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Code-barres Cote Support Localisation Section Disponibilité 20581 - Périodique Bibliothèque principale Documentaires Disponible Determination of hydroxyl groups on the surface of TiO2 pigments / Thomas Rentschler in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/97 (10/1997)
PermalinkDevelopment of functionalized SiO2–TiO2 reinforced cardanol and caprolactam modified diamine based polybenzoxazine nanocomposites for high performance applications in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
PermalinkDielectric studies of epoxy/polyester powder coatings containing titanium dioxide, silica, and zinc oxide pigments / Emile C. Trottier in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 5 (09/2012)
PermalinkDifferences between the grinding process of TiO2 pigments glossy acrylics / Artur Palasz in COATINGS TECH, Vol. 19, N° 8 (10/2022)
PermalinkLe dioxyde de titane Kronos dans les peintures-émulsion / Heinz Dörr ; Franz Holzinger / Leverkusen [Allemagne] : Kronos International, inc. (1990)
PermalinkDioxyde de titane de taille non-nanométrique, diffuseur des rayons UV / Toru Imamura in EXPRESSION COSMETIQUE, N° Hors série (11/2018)
PermalinkDiscussion on dependent light scattering phenomenon in white paint films / Jean-Claude Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 6 (11/2013)
PermalinkDispersing without grinding media / Thomas Haiß in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4608 (05/2015)
PermalinkDispersing without grinding media / Sven Hoffmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 2 (02/2014)
PermalinkDispersion stability of titanium dioxide in aqueous isopropanol with polymer dispersant / Wei Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)
PermalinkDoped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties / Aurora Petica in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)
PermalinkDoping for a better cleaning agent / Stephan Peter Bloess in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 198, N° 4528 (09/2008)
PermalinkDrying of alkyd emulsion paints / P. K. Weissenborn in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 906 (07/2000)
PermalinkPermalinkDurability and gloss / Juergen H. Braun in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 851 (12/1995)
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