A comparison of the quality of carbon black dispersions prepared by dry and wet grind processes / Ayumu Yokoyama in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 865 (02/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 865 (02/1997) . - p. 99-105 Titre : A comparison of the quality of carbon black dispersions prepared by dry and wet grind processes Type de document : texte imprimé Auteurs : Ayumu Yokoyama, Auteur ; Patrick F. Mclntyre, Auteur ; James G. King, Auteur ; Henry L. Jakubauskas, Auteur Année de publication : 1997 Article en page(s) : p. 99-105 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dispersions et suspensions Fragmentation Noir de carbone Pigments inorganiques Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : We have investigated the deflocculation mechanism of waterborne jet black dispersions made in the dry-grind process based on the two-roll milling. We also compared this dry-grind process with the conventional wet media grind process. As a result, we found that:(1)High jetness in the dry-grind process was found to result from complete surface coverage of the carbon black pigment with the acidic acrylic dispersant during the two-roll milling step. This complete surface coverage is achieved because the dry dispersant molecules before neutralization do not have electrostatic repulsion among them.(2)The amount of adsorption for the dry grind is three times as great as that for the wet grind.(3)The stabilization mechanism is due to steric repulsion imparted by the adsorbed dispersant molecules, and the electrostatic repulsion is an insignificant force for stabilization.(4)High temperature in the chip dissolution step lowers the jetness owing to the decrease in the solubility of the dispersant at higher temperatures. Note de contenu : - EXPERIMENTAL : Materials - Dispersion formulation and process conditions - Jetness measurement - Amount of adsorption measurements - RESULTS AND DISCUSSION : Dry grind vs wet grind - Effect of solvency - Effect of chip dissolution temperature on jetness Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18092 [article]

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Growing improvements / Ayumu Yokoyama in EUROPEAN COATINGS JOURNAL (ECJ), N° 11 (11/2012)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11 (11/2012) . - p. 26-31 Titre : Growing improvements : Biobased polyol enhances physical properties of 2K PU coatings Type de document : texte imprimé Auteurs : Ayumu Yokoyama, Auteur ; Hari Sunkara, Auteur ; Rajesh Saliya, Auteur Année de publication : 2012 Article en page(s) : p. 26-31 Note générale : Supplément du N° 11/2012 - Bibliogr. Langues : Anglais (eng) Catégories : Agent mattant Polyols Polytriméthylène éther Polyurée Polyuréthanes Ressources renouvelables Revêtements bi-composant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Poly(trimethylene ether) polyol (PTMEPOL) is a renewable material derived from corn. It was found to improve flexibility and adhesion of solvent-borne 2K urethane coatings. PTMEPOL was also used successfully as a liquid a medium for the synthesis of sag control agent based on polyurea and as a liquid carrier for a matting agent. Note de contenu : - Raw materials and test procedures - Film evaluation procedures - Tensile strength of clearcoat improved - Adhesion is also improved - Resin blend performs better than single resins - Matt coating properties are enhanced - Synthesis of polyurea sag control agent improved En ligne : https://drive.google.com/file/d/1-8KPz1Ho34u8-iFKCPWz5gVLFuAMi1cp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16348 [article]

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