New applications for CAB / K. R. Walker in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4452 (05/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4452 (05/2002) . - p. 11-14 Titre : New applications for CAB Type de document : texte imprimé Auteurs : K. R. Walker, Auteur Année de publication : 2002 Article en page(s) : p. 11-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétobutyrate de cellulose Automobiles -- Vernis Carboxyméthylcellulose Epaississants Formulation (Génie chimique) Mouillage (chimie des surfaces) Primaire (revêtement) Rhéologie Vernis en phase aqueuse vernis en phase solvant Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : The introduction of a water-based equivalent to CAB rheology modifers offers considerable cost savings and performance advantages for manufacturers of water-based coatings. The author shows how CMCAB works. For over 40 years cellulose acetate butyrates (CABs)have been used to modify the rheology and to improved hardness to solvent-based coatings. However, as pressure on released VOCs has increased, the use of water-based systems have, in recent years, become more important. It has been estimated that around 50% of the OEM automotive basecoats applied in Western Europe use an aqueous coating basecoat formulation. Automotive refinish paints, industrial metal, wood, a,d plastic coatings are also being pressured into the water-based route and much development is being directed into this area. Water-based coatings, however, suffer from several disadvantages compared to their solvent-based precursors. Substrate wetting arising from water's high surface tension, its slow drying rate, and the susceptibility of its evaporation rate to changes in relative humidity, all contribute to difficulties in maintaining constant properties in the appearance and application of water-based coatings can be duplicated in a variety of water-based systems with carboxymethylcellulose acetate butyrate (CMCAB). Note de contenu : - Taking a hiding - Beaten black and blue - Substrate wetting - Solvent-based clearcoats - Basecoat formulation - Driving progress - FIGURES : 1. CMCAB offers greater colour strength (top band) than traditional dispersions. This cuts costs - 2. Dry to touch time of hydroxy-functional acrylics - 3. Gloss and DOI are unaffected by CMCAB - 5,6. Viscosity variations and effect on film formation - 7. Correct flake orientation in the paint film is essential to create the curved effect that highlights vehicle design - TABLES : 1. Formulation of water-based clear coats Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28080 [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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Turning trees into foam / Anja Schneider in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 5 (05/2016)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 106, N° 5 (05/2016) . - p. 46-49 Titre : Turning trees into foam : Particle foams made from cellulose esters for large-scale production Type de document : texte imprimé Auteurs : Anja Schneider, Auteur ; Florian Rapp, Auteur ; Karl Iglhaut, Auteur ; Andreas Michel, Auteur Année de publication : 2016 Article en page(s) : p. 46-49 Langues : Anglais (eng) Catégories : Acétobutyrate de cellulose Agents d'expansion (chimie) Bioplastiques Essais de comportement au feu Mousses plastiques Propionate de cellulose Ressources renouvelables Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Index. décimale : 668.4 Plastiques, vinyles Résumé : Particle foams based on renewable cellulose derivatives could be an alternative to oil-based expanded polystyrene. In the context of a development project, researchers demonstrated that cellulose-based particle foams can be produced with varying densities using conventional processing equipment. In addition, these materials do not require halogen-containing flame retardants. Note de contenu : - Fire behavior of thermoplastic foams - Production of foamable pellets containing blowing agents - Industrial-scale production of components - FIGURES : 1. Possible influencing factors on the fire behavior on a thermoplastic foam - 2. View of the extrusion line : during pellet production it was important to optimize the quality by regulating water pressure, temperature and blowing agent content - 3. Bulk density of CP as a function of blowing agent content and water pressure En ligne : https://drive.google.com/file/d/1nNpmw2U2d74q1lXfAvHgkk-KYj3z8cRe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26332 [article]

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