Evaluation of the VOC content of coalescing aids / Kevin W. McCreight in COATINGS TECH, Vol. 2, N° 16 (05/2005)  

[article]  inCOATINGS TECH > Vol. 2, N° 16 (05/2005) . - p. 26-34 Titre : Evaluation of the VOC content of coalescing aids Type de document : texte imprimé Auteurs : Kevin W. McCreight, Auteur ; Weimin C. Liang, Auteur Année de publication : 2005 Article en page(s) : p. 26-34 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : The current standard for determination of volatile organic compounds (VOCs) in paint and coating systems in the United States is EPA Method 24 (ASTM D 3960-02). It has been reported that VOC measurements carried out using this method have errors which increase nearly exponentially at VOC levels less than 250 g/L.1 Due to the uncertainties inherent in this test method, certain classes of coatings additives have traditionally been evaluated as neat products rather than in fully formulated paints. This article outlines experimentation that was carried out to quantify the actual VOC levels of two representative coalescing aids in formulated paints using both EPA Method 24 and a proposed alternative test method that utilizes an automated thermal desorber (ATD) with flame ionization detection (FID). Results indicate that in formulated paints, the measured VOCs of coatings additives are in some cases less than the VOCs observed when these additives are tested as neat materials. En ligne : https://drive.google.com/file/d/1_oalMqxf6Aps44exaugP32s_Ppjrlr4X/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5511 [article]

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Novel techniques to investigate the impact of cellulose esters on the rheological properties and appearance in automotive basecoat systems / Deepanjan Bhattacharya in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 2 (06/2007)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 2 (06/2007) . - p. 139-150 Titre : Novel techniques to investigate the impact of cellulose esters on the rheological properties and appearance in automotive basecoat systems Type de document : texte imprimé Auteurs : Deepanjan Bhattacharya, Auteur ; Kab Seo, Auteur ; Louis T. Germinario, Auteur ; Mark D. Clark, Auteur ; Kevin W. McCreight, Auteur ; Chip Williams, Auteur Année de publication : 2007 Article en page(s) : p. 139-150 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétobutyrate de cellulose Esters de cellulose Morphologie (matériaux) Revêtements -- Additifs:Peinture -- Additifs Rhéologie Viscoélasticité Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : The viscous response of a coating formulation changes over several orders of magnitude after application onto a substrate. Furthermore, the performance and application attributes for a refinish basecoat formulation are slightly different from those of an OEM basecoat. The absence of a high temperature baking step during the refinish process necessitates that the paint exhibit very good antisag behavior as well as quick 'dry to touch' without compromising the flow and leveling properties of the coating as it dries. As most paint formulations are multicomponent in nature, it is always a challenge to precisely measure the impact of specific formulation components on the collective performance attributes of the applied coating. In this work, the focus has been to develop novel techniques that can be used to demonstrate a more quantitative measure of some of the performance attributes that rheological additives like cellulose esters can provide to automotive coatings. A series of pigmented basecoat formulations were prepared which contained cellulose acetate butyrates (CABs) of varying molecular weights at different levels based on the total solids of the coating formulation. The nonvolatile content of the formulations was also varied. The viscoelastic behavior of a typical automotive basecoat formulation during the drying process was then investigated using a novel rheological technique. Complex viscosity data (including storage and loss moduli as well as tan delta) were determined as a function of drying time and then compared to the macroscopic properties typically associated with a coating film as it dries. Thermogravimetric analysis (TGA) was also used to correlate the rheology of the metallic basecoat formulations with drying behavior of the coating. The final appearance of the coating was investigated by several microscopic techniques such as Laser Scanning Confocal Microscopy, Scanning Electron Microscopy, Atomic Force Microscopy, and Surface Profilometery, and attempts were made to correlate bulk measurements like 'flop index' with the microstructure of the coating. DOI : 10.1007/s11998-007-9014-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9014-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3655 [article]

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Use of cellulose esters as rheology additives for automotive OEM clearcoats / Jianhui Zhou in COATINGS TECH, Vol. 9, N° 6 (06/2012)  

[article]  inCOATINGS TECH > Vol. 9, N° 6 (06/2012) . - p. 28-35 Titre : Use of cellulose esters as rheology additives for automotive OEM clearcoats Type de document : texte imprimé Auteurs : Jianhui Zhou, Auteur ; Brian King, Auteur ; Kevin W. McCreight, Auteur ; Josh Seeley, Auteur Année de publication : 2012 Article en page(s) : p. 28-35 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture Epaississants Esters de cellulose Vernis -- Additifs Index. décimale : 667.7 Cires, laques, vernis Résumé : Automotive coatings have witnessed a definite transition to greener technologies over the past decade. Paint lines are being built or retrofitted for consolidated paint processes, with the intent to reduce energy consumption and operating cost. Specific to automotive clearcoats, there is a move to a one-pass application and a continuing shift to higher solids clearcoats. Consolidated paint processes require a clearcoat with improved strike-in resistance, better flow/leveling, and "filling" power to cope with telegraphing from imperfect substrates. One-pass application requires a clearcoat with an improved sag/flow balance. This article illustrates the improved appearance achieved by the use of cellulose ester rheology additives, alone or in combination with other rheology modifiers, in automotive OEM 1K clearcoats. Electrostatic rotary bell application was utilized to assess clearcoat appearance. Flow and leveling were characterized by a BYK Wavescan Dual. the viscoelastic behavior of clearcoats during the film drying process was investigated using a novel rheological technique, and the speed of solvent release was monitored using thermogravimetric analysis (TGA). Note de contenu : - USE OF CELLULOSE ESTERS AS RHEOLOGY ADDITIVES FOR AUTOMOTIVE OEM CLEARCOATS : Impact of cellulose esters on the appearance of OEM clearcoats - Natural weathering of OEM clearcoats - Impact of cellulose esters on the drying behavior of automotive OEM clearcoats En ligne : https://drive.google.com/file/d/1JQOxn0yLv4F87dbvdRyEvOYirsIufPPJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15570 [article]

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