Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process / Vaishali Saroha in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1171-1186 Titre : Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process Type de document : texte imprimé Auteurs : Vaishali Saroha, Auteur ; Hina Khan, Auteur ; Sharad Raghuvanshi, Auteur ; Dharm Dutt, Auteur Année de publication : 2022 Article en page(s) : p. 1171-1186 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique Angle de contact Caractérisation Kaolin Papier -- Revêtements Papier et carton couché Perméabilité Résistance à la traction Résistance aux huiles et graisses Revêtements organiques Stabilité thermique Talc Transmission de vapeur d'eau Index. décimale : 667.9 Revêtements et enduits Résumé : The poor barrier of cellulosic paper against water vapor and oil limits its wide application as a packaging material. Lamination, extrusion, and dispersion coating are applied on paper surface to improve barrier properties. Dispersion coating can be applied to paper surface on line during paper preparation using rod coater. In the present study, an attempt has been made to increase the process speed of coating preparation by single-step process at varying pigment concentration. Coating dispersion was applied on kraft paper using laboratory rod coated and dried in hot air oven at 80°C for 5 min. Furthermore, thermal stability, water vapor barrier properties, and grease resistance of PVOH/kaolin and PVOH/talc-coated paper were studied. Additionally, the effect of single layer and bilayer coating on paper properties was also studied. Permeability model was used to predict the orientation of pigments to the surface of paper. Viscosity of both kaolin and talc-based dispersion increased with the increase in pigment concentration. Thermal studies showed that at 600°C residual mass (%) of PVOH film increased from 0.6 to 9.89% and 15% with the addition of 25% (by weight) kaolin and talc pigment. At high pigment concentration (40–50%, by weight), the highest reduction in WVTR was observed for both the pigments. Excellent coverage of paper surface and high grease resistance was observed for all coating formulations. Our study showed that talc provides better thermal and barrier properties to coated paper than kaolin. Note de contenu : - MATERIALS AND METHODS : Materials - Coating dispersion preparation - Paper coating and film preparation - Characterization - Thermogravimetric analysis (TGA) - FESEM - WVTR - KIT test - Statistical analysis - RESULTS AND DISCUSSION : Effect of pigments on rheological properties of PVOH - X-ray diffraction (XRD) - ATR-FTIR - Thermal stability - Tensile strength - Roughness and porosity of coated paper - Contact angle - Table 1 : Characteristic parameter of kaolin in PVA/kaolin nanocomposite film - Table 2 : Crystallinity index of XRD diffractogram of composite film with respect to 101 plane reflections - Table 3 : Residual mass of PVOH, PVOH/kaolin, and PVOH/talc composite film at different temperatures - Table 4 : Roughness and porosity of uncoated and coated paper - Table 5 : Contact angle of uncoated and PVOH/kaolin and PVOH/talc-coated papers - Table 6 : Grease resistance (KIT test) of single- and double-coated paper DOI : https://doi.org/10.1007/s11998-021-00596-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00596-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38045 [article]

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