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Color and appearance basics for coatings / Robert T. Marcus in COATINGS TECH, Vol. 7, N° 7 (07/2010)

[article]  inCOATINGS TECH > Vol. 7, N° 7 (07/2010) . - p. 26-36 Titre : Color and appearance basics for coatings Type de document : texte imprimé Auteurs : Robert T. Marcus Année de publication : 2010 Article en page(s) : p. 26-36 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Revêtements vision des couleurs Index. décimale : 667.9 Revêtements et enduits Résumé : The two major functions of a coating are protection and decoration. Color and appearance are important in the coatings industry because they describe the decorative qualities that our customers seek from our products. Knowledge of color and appearance is important to personnel in all areas of the coatings industry. This tutorial will review the basics of color and appearance. Note de contenu : - COLOR PERCEPTION - COMMUNICATING COLOR - COLORIMETRY AND THE CIE SYSTEM FOR MEASURING COLOR : Standard lights sources and illuminants - The object - The standard observer - Calculation of tristimulus values - CIE L* a* b* color space - COLOR DIFFERENCES AND TOLERANCES : Color difference equations - Tolerances - Indices of metamerism Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18461 [article]

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Film formation of 2K waterborne polyurethane systems / Philippe Olier in COATINGS TECH, Vol. 7, N° 7 (07/2010)

[article]  inCOATINGS TECH > Vol. 7, N° 7 (07/2010) . - p. 38-42 Titre : Film formation of 2K waterborne polyurethane systems Type de document : texte imprimé Auteurs : Philippe Olier ; Imke Ludwig ; Mathias Kind ; Wilhelm Schabel ; Joachim Krenn ; Steve Meeker Année de publication : 2010 Article en page(s) : p. 38-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Formation de film Polyuréthanes Revêtements Revêtements bi-composant:Peinture bi-composant Revêtements en phase aqueuse -- Séchage:Peinture en phase aqueuse -- Séchage Revêtements en phase aqueuse:Peinture en phase aqueuse Spectroscopie Raman Index. décimale : 667.9 Revêtements et enduits Résumé : Two-pack (2K) waterborne polyurethanes are increasingly used in coatings technologies. Examples of such coatings can be encountered in many different fields including metal coatings (for railway carriage, car refinish ... ), wood coatings (e.g., parquet flooring, furniture) or soft-feel coatings for plastic in the automotive industry. The benefits brought by waterborne technology can explain this growth. It is fully compliant with the new volatile organic compounds (VOC) regulations and contributes to better health and safety conditions for both workers and end users. Of course, switching from solvent-based to waterborne technology implies technical challenges. Many improvements have been achieved during the past years to develop waterborne systems that can compete with solvent-based coatings. In the case of polyisocyanates, for instance, the ease of miwing in the formulation and the control of side reactions with water have been greatly improved by using hydrophilically modified polyisocyanates. However, a deeper understanding of the film formation mechanisms and the impact of different key parameters is still essential in order to finetune the formulation and achieve optimal results. Many techniques have been used to investigate these aspects such as Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), or even mechanical measurements. Confocal Raman spectroscopy has also been widely used but only a few reports mention its use for the investigation of aqueous systems. Here we present the use of Inverse Micro Raman spectroscopy (IMRS in order to investigate the drying behavior and fim composition of 2K waterborne polyurethanes. Note de contenu : - INVESTIGATION OF 2K WATERBORNE POLYURETHANE SYSTEMS USING IMRS : PRINCIPLES - QUANTITATIVE EVALUATION - EXPERIMENTAL : Inverse Micro Raman Spectroscopy (IMRS) experimental setup - Materials - RESULTS : Influence of the dry content of the polyol - Investigation of film drying and composition Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18462 [article]

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UV-curable powder coatings for heat-sensitive substrates / Ryan Schwarb in COATINGS TECH, Vol. 7, N° 7 (07/2010)

[article]  inCOATINGS TECH > Vol. 7, N° 7 (07/2010) . - p. 44-49 Titre : UV-curable powder coatings for heat-sensitive substrates Type de document : texte imprimé Auteurs : Ryan Schwarb ; Michael Knoblauch ; Jim Cox Année de publication : 2010 Article en page(s) : p. 44-49 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Peinture poudre -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : The consumption of UV-cured powder coating is increasing. Designers are creating more products that use UV-cured powder coated components in their products. UV-cured powder coating is perceived and recognized as a viable chemistry and a reliable material for a variety of substrates and product applications. The continuing challenge is to educate the market about the benefits and advantages of UV-cured powder. This is an advanced and developing chemistry and is a highly efficient and productive application technology. Higher demand for UV-cured powder coating will increase the flow of investment capital into the UV-cured powder coating segment of the coatings industry. As demand increases, the incremental cost of system components and constituent chemistries will decrease, thus lowering the total applied cost of finished products. UV-cured powder coatings meet the evergrowing worldwide demand for environmentally friendly and energy efficient coatings. The future for UV-cured powder coating looks very bright. Note de contenu : - Table 1 : Model of a UV-cured powder vs. solventborne coating system - Table 2 : Performance results of UV-cured powder coating on various plastic substrates - Table 3 : Performance results of UV-cured powder coatings on MDF - Appendix A : Technology comparison Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18463 [article]

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