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Water resistance improvement of paperboard by coating formulations based on nanoscale pigments / Wasin Thitsartarn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)
[article]
Titre : Water resistance improvement of paperboard by coating formulations based on nanoscale pigments Type de document : texte imprimé Auteurs : Wasin Thitsartarn, Auteur ; Tunyarut Jinkarn, Auteur Année de publication : 2020 Article en page(s) : p. 1609-1617 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cartonnages -- Propriétés mécaniques
Emballages
Enrobage (technologie)
Formulation (Génie chimique)
Hydrophobie
Kaolin
Morphologie (matériaux)
Nanoparticules
Papier et carton couché
Pigments
Résistance à l'humidité:Résistance à l'eau
Rugosité
Surfaces (Physique)
Surfaces -- AnalyseIndex. décimale : 667.9 Revêtements et enduits Résumé : This research assessed how type, particle size, and concentration of pigment in coating formulations influenced water and water vapor barriers of paperboard packaging. Calcium carbonate (CaCO3) and kaolin of micro- and nanosize of 1 and 0.05 µm, respectively, were added to 3% (w/v) gelatinized cassava starch to prepare coating formulations with different pigment concentrations of 5, 15, and 25% (w/v). These were applied on paperboard surfaces using the rod coating technique. Results showed that water resistance of paperboard, evaluated by contact angle (CA) and water absorptiveness (Cobb) were strongly influenced by pigment type (chemistry), particle size and shape, and pigment concentration (coating layer thickness). A hydrophobic surface (CA > 100) was obtained only for the nano-CaCO3 formulation with 25% (w/v) by combined effects of the nanosize scale, the spherical shape, and the hydrophobic surface of CaCO3 particulates. Kaolin nanoparticle coatings produced hydrophilic surfaces (CA ~ 90) with high water absorptiveness, while high concentrations of kaolin microparticle coating slightly improved water and water vapor barriers by compact arrangement of flattened particles. Mechanical strength properties of the paperboard were not significantly affected by coatings, but surface cracking was observed for large particle size or at high pigment concentration due to the increase in pigment/starch ratio. Note de contenu : - MATERIALS AND METHODS : Materials - Coating formulation preparation - Coating process and conditioning - Physical properties and surface characterization - Water resistance and water vapor analysis - Mechanical property measurement
- RESULTS AND DISCUSSION : Coating weight and coating layer thickness - Surface roughness and morphology - Water resistance and water vapor barrier - Mechanical property analysisDOI : https://doi.org/10.1007/s11998-020-00386-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00386-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34964
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1609-1617[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22458 - Périodique Bibliothèque principale Documentaires Disponible Waterborne dimethylolpropionic acid-diisocyanate adducts with alkali-deblockable isocyanate groups as pretanning agent for chrome tanning / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 2 (02/2015)
[article]
Titre : Waterborne dimethylolpropionic acid-diisocyanate adducts with alkali-deblockable isocyanate groups as pretanning agent for chrome tanning Type de document : texte imprimé Auteurs : Jie Liu, Auteur ; Zhou Xu, Auteur ; Chen Yi, Auteur ; Haojun Fan, Auteur Année de publication : 2015 Article en page(s) : p. 43-53 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
Bisulfite de sodium
Caractérisation
Collagène
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux de chèvres
Diisocyanates
Eaux usées -- Analyse
Isocyanates
Morphologie (matériaux)
Propionique diméthylol, Acide
Réticulation (polymérisation)
Stabilité au stockage
Structure chimique
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Diisocyanates qualify as tanning agent by virtue of their strong tendency to crosslink collagen molecules by reacting with amino groups. However, due to their sensitivity to water, these compounds cannot be used directly in aqueous environment, which is the basis for leather processing. To address this problem, waterborne dimethylolpropionic acid-diisocyanate adducts (WDDAs) with temporarily-blocked isocyanate terminals were prepared in the present paper by using NaHSO3 as blocking agent, and further evaluated as a pretanning agent for chrome tanning. Fourier transform infrared (FTIR) spectra revealed that the isocyanate terminals in WDDAs were successfully blocked by NaHSO3. The blocked isocyanates were stable under ambient temperature, but prone to deblocking under alkaline condition. The regenerated isocyanates were found still capable of crosslinking collagen molecules to impart hydrothermal stability. In leather tanning, a high shrinkage temperature (Ts>110°C) was achieved by successively treating goat skin with 5 wt% WDDAs and 4 wt% chrome powder. Stereomicroscope and SEM observation further indicated that the WDDA-chrome tanned leather exhibited tight grain surface and well opened up fiber structure in comparison with semi-chrome tanned leather. Due to the presence of carboxyl group in dimethylolpropionic acid, it was also found that WDDAs enhanced the absorption of chromium in the resultant leathers (% chrome uptake> 90%), resulting in significantly less Cr residual in the tanning wastewater. In addition, it is important to note that the usage of salt in pickling process was avoided owing to previous crosslinking of amino groups, which is very helpful for overcoming the problem of total dissolved solid (TDS) related to neutral salts. The tanning effect of WDDAs and their auxiliary function for chrome tanning allow them to be applicable as a pretanning agent, which efficiently alleviates the environmental impact of traditional chrome tanning for sustainability. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Synthesis of WDDA - Characterization of WDDA - Preparation of gelatin modified by WDDA - Characterization of gelatin modified by WDDA - Tanning trial - Assessment of properties of tanned leathers - Stereomicroscope and scanning electron microscope (SEM) observation - Determination of total chromium in tanning wastewater
- RESULTS AND DISCUSSION : Chemical structure of WDDAs - Storage stability of WDDAs - Conversion ratio - Reaction between WDDA and collagen - Tanning and tanning wastewater analysis - Organoleptic properties of the tanned leather - Morphologies of grain surface and fibers of the tanned leatherEn ligne : https://drive.google.com/file/d/1LnUCMds_IewQVvlX8zlBD7CViyxjvVgo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23199
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 2 (02/2015) . - p. 43-53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16945 - Périodique Bibliothèque principale Documentaires Disponible Wool handbook - Volume 1 / Werner von Bergen / New York [Etats-Unis] : Wiley-VCH (1963)
Titre : Wool handbook - Volume 1 : A text and reference book for the entire wool industry Type de document : texte imprimé Auteurs : Werner von Bergen, Editeur scientifique Mention d'édition : 3e. Ed. Elarg. Editeur : New York [Etats-Unis] : Wiley-VCH Année de publication : 1963 Importance : XXII-800 p. Présentation : ill Format : 23 cm Note générale : Index - Bibliogr. Langues : Américain (ame) Catégories : Essais dynamiques
Laine
Laine -- Classement
Mélanges de fibres
Morphologie (matériaux)
Production
Structure moléculaireIndex. décimale : 677.31 Laine Note de contenu : - 1. Historical and economic background
- 2. Sheep breeds-sheep raising
- 3. The morphology and physical properties of wool
- 4. The molecular structure and chemical properties of wool
- 5. Specialty hair fibers
- 6. Reclaimed wool and secondary raw materials
- 7. Wool blends with man-made fibers
- 8. Grading and production of wool
- 9. The marketing of wool
- 10. Physical and chemical testingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34795 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22424 677.31 VON Monographie Bibliothèque principale Documentaires Disponible