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Durability and gloss / Juergen H. Braun in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 851 (12/1995)
[article]
Titre : Durability and gloss Type de document : texte imprimé Auteurs : Juergen H. Braun, Auteur ; Daryl P. Cobranchi, Auteur Année de publication : 1995 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture
Brillance (optique)
Couches minces
Dioxyde de titane
Durée de vie (Ingénierie)Index. décimale : 667.9 Revêtements et enduits Résumé : The durability of high gloss industrial and automotive coatings, their service life, is usually predicted from gloss retention data. Because of time pressures, business decisions are often based on data of an early phase of exposure. Evidence and conclusions are presented that show that initial gloss retention results of coatings pigmented with TiO2 involve phenomena of film formation rather than weathering. We show that film formation of automotive finishes continues after cars leave the baking ovens, albeit on a time scale of months rather than the minutes for which the paint film is baked. Later in the service life of a paint film, weathering sets in. Oxidation of the polymeric binder takes place involving the combined actions of UV light, water, and oxygen. As a result, the film surface erodes and its gloss degrades far beyond effects of film formation. According to our hypothesis, high gloss rather than good durability of the TiO2 pigment in the coating makes for good initial gloss retention. Eventually, of course, the durability of the TiO2 pigment, that is, the inhibition of its surface catalytic activity, becomes important for film performance. Note de contenu : - 30J paints
- Exposures
- Gloss studies
- Weight loss studies
- Solvent swelling experiments
- Chemical analyses-Daryl P. Cobranchi
- Other dataPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18574
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 851 (12/1995) . - p. 55-62[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003497 - Périodique Bibliothèque principale Documentaires Disponible 003509 - Périodique Bibliothèque principale Documentaires Exclu du prêt Gloss of paint films : II. Effects of pigment size / Juergen H. Braun in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 828 (01/1994)
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Titre : Gloss of paint films : II. Effects of pigment size Type de document : texte imprimé Auteurs : Juergen H. Braun, Auteur ; David P. Fields, Auteur Année de publication : 1994 Article en page(s) : p. 93-98 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique)
Couches minces
Dioxyde de titane
Particules (matières)
Pigments inorganiques
Revêtements -- Propriétés optiques:Peinture -- Propriétés optiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : A theory that explains the mechanism by which pigments affect the gloss of paint films was strengthened and expanded. Immediately after paint is applied, surface tension of the wet film maintains its surface at molecular smoothness and gloss at perfect distinctness-of-image. While the film dries or cures it shrinks from loss of solvent or condensation products. Pigment particles and, if present, resin droplets, come together, interact and develop structure within the wet film. Eventually, the compressive strength of this structure in the film overcomes the surface forces. As the film continues to shrink, its surface becomes rough, degrading distinctness-of-image gloss. Experimental data and theoretical argument are presented that show that effects are proportional to pigment particle size. Note de contenu : - THE MECHANISM OF PIGMENT INVOLVEMENT IN GLOSS
- EXPERIMENTAL : TiO2 pigments - Flatting agents - Pigment particle size - Gloss performancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18752
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 828 (01/1994) . - p. 93-98[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 003475 - Périodique Bibliothèque principale Documentaires Exclu du prêt Gloss retention / Juergen H. Braun in EUROPEAN COATINGS JOURNAL (ECJ), N° 5/95 (05/1995)
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Titre : Gloss retention Type de document : texte imprimé Auteurs : Juergen H. Braun, Auteur Année de publication : 1995 Article en page(s) : p. 356-357 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture
Brillance (optique)
Dioxyde de titane
Durée de vie (Ingénierie)
Pigments inorganiques
Revêtements -- DétériorationIndex. décimale : 667.9 Revêtements et enduits Résumé : Gloss retention, the ability of a coating to retain its showroom gloss during exposure, predicts the service life of automotive finishes. It is, after all, the owner's pride in a shiny car that is involved in the life of satisfactory service. Does the measure reflect the degradation of a coating under the influence of weathering? Not necessarily. New insights into the mechanism by which pigments degrade the gloss of paint films teach us that initial gloss retention results reflect not film degradation but appear to involve a continuation of the processes of film formation that continue after the coatings leaves the paint shop. We will comment on European and American perceptions of service life predictions of paint films pigmented with TiO2, chalking and gloss retention perspectives will be contrasted and their consequences will be outlined. Note de contenu : - Durability and sevrice life prediction
- Chalking versus gloss retention
- In-service fil formationPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11311
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 5/95 (05/1995) . - p. 356-357[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002504 - Périodique Bibliothèque principale Documentaires Disponible Pigment : measurement of performance / Juergen H. Braun in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 880 (05/1998)
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Titre : Pigment : measurement of performance Type de document : texte imprimé Auteurs : Juergen H. Braun, Auteur Année de publication : 1998 Article en page(s) : p. 79-81 Langues : Américain (ame) Index. décimale : 667.2 Colorants et pigments Résumé : Successes in the development of tests for pigment characterization have contributed greatly to sucesses of the industry. However, problems with the evaluation of performance have slowed progress in some areas of pigment development. Characterization involves measurement of indentifiable surface, structure, etc. Performance evaluations involve systems: paints and paint films. Complexity of the systems contributes to testing problems.
Usually, performance tests try to simulate the real word. The closer to reality the test, the more convincing is its result. Test paints resemble, and often are, commercial paints. But commercial paints are formulated to minimize performance differences among ingredient batches or suppliers. The formulations are thus designed to be insensitive to the performance characteristics at stake.
Model paints can be formulated for sensitivity to pigment performance but paint are convincing but not sensitive to the pigment performance. Data from a model paint is sensitive to the pigment but not convincing.
Optical performance testing is least affected because of impressive instrumental progress. Hiding power, tinting strength and color can now be tested quantitatively , reliably, and reproducibly. Relative standard deviations of ± 5% are typical. Testing of durability, mechanical, and chemical performance has become a bottleneck to progress. Results can usually only be renked but not quantified and can rarely be reproduced to even modest satisfaction. Uncertainties, relative standard deviations, of 30-40% of value are typical. Problems are aggravated because the coatings industry overestimates the reliability and reproducibility of test results. Sill, it is not enough that a test reproduces well. In addition, it must be sensitive enough to reproduce small differences between similar pigment.
Statistical evaluation of performance data would certainly help. Statistical quality control saves future expense but costs up-front money. Appreciation of statistics and paint laboratories and has yet to make significant inroads into manufacture and management.Note de contenu : - OPTICAL PERFORMANCE : Pigment strength
- DURABILITY : Color pigments - Coatings
- CHEMICAL AND MECHANICAL PERFORMANCEPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18005
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 880 (05/1998) . - p. 79-81[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003549 - Périodique Bibliothèque principale Documentaires Disponible Titanium dioxide - a review / Juergen H. Braun in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 868 (05/1997)
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Titre : Titanium dioxide - a review Type de document : texte imprimé Auteurs : Juergen H. Braun, Auteur Année de publication : 1997 Article en page(s) : p. 59-71 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Pigment minéral' 'Titane oxyde' Fabrication 'Traitement surface' Broyage 'Phase cristalline' 'Dimension particule' 'Composition chimique' 'Propriété optique' 'Résistance intempérie' Utilisation 'Article synthèse' TiO2 Index. décimale : 667.9 Revêtements et enduits Résumé : The white pigment market is served almost exclusively by titanium dioxide pigments. The objective of-this overview is to familiarize readers with the one ingredient that may take the lion share of costs in a coating-titanium dioxide. Issues specific to TiO2 are discussed, including commerce, manufacture, characteristics, performance and commercial grades. Note de contenu : - COMMERCE
- MANUFACTURE : Chloride process - Sulfate process - surface treatments - Grinding and finishing
- CHARACTERISTICS : Crystal phase - Particle size - Composition - Surface - Packing characteristics and oil absorption - Measurement - Contaminants and color - Safety
- PERFORMANCE : Weathering - Pigment interactions
- COMMERCIAL GRADESPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18258
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 868 (05/1997) . - p. 59-71[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003537 - Périodique Bibliothèque principale Documentaires Disponible