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POLYMERS PAINT COLOUR JOURNAL - PPCJ . Vol. 197, N° 4510Metallic moments / Lowering tension / Energy efficiency / Melting moments / Clear waterMention de date : 03/2007 Paru le : 12/04/2007 |
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Ajouter le résultat dans votre panierThe liquid metal look / Wei Liu in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4510 (03/2007)
[article]
Titre : The liquid metal look Type de document : texte imprimé Auteurs : Wei Liu, Auteur ; Carolyn Lavallee, Auteur Année de publication : 2007 Article en page(s) : p. 18-22 Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet
Oxychlorure de bismuth
Photostabilité
Pigments métalliques
RéflectanceIndex. décimale : 667.2 Colorants et pigments Résumé : Recent advances mean bismuth oxychloride pigment is being used for variety of purposes. This paper looks at its application in coatings.
The liquid metal look is essentially a smooth, highly reflective, non-grainy appearance. This is accomplished by using either a continuous film or by using very thin platelets, on the order of 30-50 nanometers, to reduce the scattering of light from edges of platelets. It has been desirable in the automotive industry for some time and is now making an appearance in other coating applications, such as teletronics.
This is accomplished by using either a continuous film or by using very thin platelets of a highly reflective pigment. One of the pigments that satisfy these requirements is bismuth oxychloride. This pigment has been better know for applications such as button and costume jewellery coatings, but recent advances make it feasible for less traditional applications as well, such as achieving the liquid metal effect.
Bismuth oxychloride is made by the reaction of bismuth nitrate in acid solution with chloride. By suitably controlling pH and temperature, the formation of BiOCl is thermodynamically preferred over Bi2O3, bismuth oxide. With very fine control of these same parameters the crystals grow as very thin patelets. The chemical reaction is as follows :
Bi(NO3)3 + H2O + 3NaCl --> BiOCl + 2HCl + 3NaNO3
The resulting platelets are about 90nm thick at the edge and somewhat thicker in the middle. It is the shape of these platelets, along with the index refraction (about 2.0), that is responsible for its pearlescent appearance.Note de contenu : - Bi(NO3)3 + H20 + 3NaCl -> BiOCl + 2HCl + 3NaNO3
- Optical properties vs effect
- UV stability
- Applications
- Applications in coatings
- Blended
- Test result
- UV absorber
- TABLE : 1. Physical properties of BiOCl and TiO2 coated mica - 2. L change for BiOCl crystal stabilised by cerium hydroxide in medium shade after 240hr QUV 340 exposure - 3. L* change for BiOCl crystal stabilised by cerium hydroxide and UV absorber in medium shade after 240hr QUV exposureEn ligne : https://drive.google.com/file/d/1bguGWEO5jMB1nJugjzoXYUUtA2H_EmKg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27409
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 197, N° 4510 (03/2007) . - p. 18-22[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006367 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Precious metals Type de document : texte imprimé Auteurs : Steven Kerr, Auteur Année de publication : 2007 Article en page(s) : p. 24-25 Langues : Anglais (eng) Catégories : Automobiles -- Matériaux
Pigments à effets spéciaux
Pigments métalliquesIndex. décimale : 667.9 Revêtements et enduits Résumé : This paper is about metallic effect pigments technologies use in automotive, packaging and mobile telephone industries.
To the coatings formulating chemist, metallic effect pigments are one of many pigments available within the palette for producing attractive special effects that add value, style and uniqueness to the final application of the coating they are formulating. This can be for many varied consumer items such as automobiles, mobile telephones, packaging and electrical items to name a few. However, the use of metallic effect pigments is undoubtedly the largest area of effect pigment use within coating formulations due to the special nature of those pigments and the advances that are continually being made in developing the types of metallic pigments available for use in coatings. This paper will summarise the various metallic effect pigment technologies available.Note de contenu : - Sparkle Silver - Cornflake technology
- Sparkle Silver Premier
- Sparkle Silver Ultra
- Platinum SilverEn ligne : https://drive.google.com/file/d/1yv4tbnx0in2YHFmghqXZYzrHzaXMIky0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27410
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Code-barres Cote Support Localisation Section Disponibilité 006367 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Universal concentrate Type de document : texte imprimé Année de publication : 2007 Article en page(s) : p. 26-28 Note générale : Bibliogr. Langues : Anglais (eng) 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.
Colorimétrie
Ethoxylate d'alkylphénol
Nonylphenol éthoxylates
Oxyde de fer
Pigments métalliques
Produits chimiques -- Suppression ou remplacement
RhéologieIndex. décimale : 667.2 Colorants et pigments Résumé : This article is about the development of an APE replacement for use as dispersing additives for transparent iron oxides and aluminium pigments. More than 40,000t of alkylphenolethoxylates (APEs) are produced annually. They are highly versatile and therefore used in the most diverse applications such as detergents, plastics and in the agrochemicals and coatings industries. In the latter, alkylphenolethoxylates are employed in the manufacture of universal pigment concentrates. These are waterborne formulations for colouring waterborne and solventborne base paints. The use of such universal pigment concentrates is state-of-the-art but the use of alkylphenolethoxylates (mainly nonylphenolethoxylates, [NPE]) is, for many reasons, questionable. The most serious is certainly the threat to water posed by nonylphenol, a decomposition product of nonylphenolethoxylate, which is formed as soon as NPE reaches the environment and thus waste water. Nonylphenol is similar to the female hormone, 17-β-oestradiol. The intervention of such decomposition products in the reproduction cycles of fish and mammals is considered proven. Moreover, even low concentrations of nonphenol are toxic to aquatic life. Despite these serious ecological problems and related regulatory controls, replacing nonylphenolethoxylates in universal pigment concentrates has proved difficult and lengthy due to the almost complete lack of suitable alternatives. Pigment concentrates based on transparent iron oxide and slurries of aluminium pigments pose a particular challenge. Note de contenu : - Nonylphenolethoxylate and ionic derivates
- Risk-free aromatic ring-containing structures
- Tested formulations
- Rheology
- Colourimetric tests
- Further development
- Transparent iron oxides
- FIGURES : 1. Comparison of 17-,oestradiol with nonylphenol - 2. Non-ionic NP structure and isphosphate derivative - 3. Phosphate with a polyether containing styrene oxide - 4. Viscosity profiles of iron oxide red concentrates - 5. Typical results in a waterborne acrylic emulsion and in a solvent borne alkyd paint
- TABLES : 1. Tested formulations - 2. Results with iron oxides - Sample formulation with transparent iron oxidesEn ligne : https://drive.google.com/file/d/1BqTnQdSKGNXbH4Pq1f9uxDAgXdWe0zNb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27417
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 197, N° 4510 (03/2007) . - p. 26-28[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006367 - Périodique Bibliothèque principale Documentaires Disponible Lowering the tension / Vicky James in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4510 (03/2007)
[article]
Titre : Lowering the tension Type de document : texte imprimé Auteurs : Vicky James, Auteur ; Xue Jian, Auteur Année de publication : 2007 Article en page(s) : p. 32-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents mouillants
Angle de contact
Chimie des surfaces
Interfaces gaz-liquide
Interfaces solide-liquide
Mouillage (chimie des surfaces)
Polyéther de silicone
Surfactants
Tension superficielleIndex. décimale : 667.9 Revêtements et enduits Résumé : The use of surfactats to improve the wetting performance of coatings is of great importance, in particular for waterborne coatings. Increasingly, water-based coating systems are formulated for more demanding applications. To comply with emission regulations, organic solvent content is reduced or elimined. An undesired effect of this reformulation is a drop in the wetting properties of the coatings. This has a dramatic effect, in particular, on the performance of coatings applied to low-energy substrates. In this paper we discuss the use of silocone surfactants to lower the surface tension of waterborne coatings and investigate the relationship between silicone surfactant chemical structure and wetting properties. Note de contenu : - Substrate wetting defects and wetting agents
- Mechanism of substrate wetting
- Silicone surfactants as wetting agents
- Conditions at the air/liquid interface - surface tension
- Conditions at the liquid/substrate interface - contact angleEn ligne : https://drive.google.com/file/d/1CKDPfaJwecAIwlTALoYlw4g0BakvaV4E/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27426
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 197, N° 4510 (03/2007) . - p. 32-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006367 - Périodique Bibliothèque principale Documentaires Disponible Pigmentation research / David M. Hyde in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4510 (03/2007)
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Titre : Pigmentation research Type de document : texte imprimé Auteurs : David M. Hyde, Auteur ; Selby M. Brannon, Auteur Année de publication : 2007 Article en page(s) : p. 46-56 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Pigments
Rayonnement infrarouge
Rayonnement solaire
Rayonnements
Réflectivité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Recent advances in pigmentation technology have allowed formulators to achieve a greater infrared reflectivity in functional coatings compared to traditional pigmentation technologies. The technology also maintains the appropriate light absorption in the visible spectrum, to impart colour.
The ability of functional infrared reflective coating systems to lower heat build-up results in reduced thermal warpage, reduced thermal cycling degradation, lower energy costs related to cooling and improved comfort and functionality of dark colour exterior objects such as park benches, hand railings and even polymer concrete.This paper will explore advances in infrared pigmentation technology to the reader, and explore potential new applications of infrared reflective pigmentation technology in composites.
Rising energy costs continue to drive advances in new technologies designed to improve energy efficiency. One such technology is the use of specialty infrared reflective pigments used to impart colour to an object and reflect the invisible heat from the object to minimise heat build-up, when exposed to solar irradiance. Ultimately, the reflection of infrared energy lowers the heat build-up resulting in a reduction on the load of the cooling system and therefore achieving cost savings.
In order to understand and maximise the functional mechanisms and effects of infrared reflecting pigmentation technologies, one musts understand the sciences regarding solar radiation, black and gray body radiation, emissivity, reflectance, total solar reflectance, light scattering, light absorption, and relevant test methods.Note de contenu : - Electromagnetic radiation
- Sunlight
- Solar irradiance
- Reflectance, absorption and scattering of light
- Total solar reflectance
- Black body radiation
- Gray body radiation
- Emissivity
- Test methodologies - heat build testing
- Test methodologies - solar spectral reflectometer
- Test methodologies - emissometer
- Test methodologies - thermal imaging
- Test methodologies - UV-VIS-NIR spectrophotometer
- Infrared reflective pigmentation science - keeping objects cool
- IR reflective coatings - Case 1 : infrared reflectiing gray versus traditional gray
- IR reflective coatings - Case 2 : traditional green versus two indrared reflecting greens
- IR reflective technology - example for consideration
- IR reflective technology - contamination concerns
- IR reflective technology - avoiding warpage and thermal cycling
- IR reflective composites - possibilities
- IR reflective composites - relationship of total solar reflectance to predicted vertical heat build of titanium dioxide white and carbon black pigmented ATH filled thermoset composites
- Thermoset composite solar reflectance dataEn ligne : https://drive.google.com/file/d/1hpj4SMPIF8haMO9MBD5xlcSIk1ktDGRu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27427
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Code-barres Cote Support Localisation Section Disponibilité 006367 - Périodique Bibliothèque principale Documentaires Disponible Property developing / A. Bouvy in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4510 (03/2007)
[article]
Titre : Property developing Type de document : texte imprimé Auteurs : A. Bouvy, Auteur Année de publication : 2007 Article en page(s) : p. 62-68 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Michelman describes how dispersion developments have evolved and discusses the high performance properties now delivered on a wide variety of substrates.
Aqueous dispersions of random Ethylene Acrylic Acid (EAA) copolymers provide a unique combination of properties that take advantage of respective comonomers (E and AA), used in their preparation. The presence of AA reduces the crystallinity of E segments. Increasing the AA content in a copolymer, will not only result in a more amorphous molecule but will also significantly improve the adhesion performance. Requirements for adhesion to nonpolar substrates, faster line times and lower heat seal temperatures are just a few of the developments explored in this paper.Note de contenu : - Structure - properties relationship
- Stability
- Typical coating applications of EAA copolymer dispersions
En ligne : https://drive.google.com/file/d/13qRvVtRob3Qk_LP5an6D7SuwGNyYvGEf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27435
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