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Crosslinking vs. interdiffusion rates in melamine-formaldehyde cured latex coatings : a model for waterborne automotive basecoat / Mitchell A. Winnik in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 892 (05/1999)
[article]
Titre : Crosslinking vs. interdiffusion rates in melamine-formaldehyde cured latex coatings : a model for waterborne automotive basecoat Type de document : texte imprimé Auteurs : Mitchell A. Winnik, Auteur ; Patrick Pinenq, Auteur ; Christian Krüger, Auteur ; Jianxin Zhang, Auteur ; Phillip V. Yaneff, Auteur Année de publication : 1999 Article en page(s) : p. 47-60 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture
Copolymère mélamine-Formaldéhyde
Polyacrylates
Réticulation (polymérisation)
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Designing optimal formulations for automotive waterborne basecoats can be fairly complex, often requiring knowledge of events that occur at the molecular level. The ultimate performatce of the coating can depend upon the success with which this knowledge is applied. We examine a system in which an aqueous dispersion of an acrylic latex with -OH functionality reacts with a melamine derivative when heated. We use fluorescence-labeling and energy transfer measurements to obtain information on the relative rates of crosslinking and interparticle polymer diffusion in these films. We show that temperature and particle morphology play an important role in the development of film properties. Finally, these energy transfer experiments provide information on the location of the melamine-formaldehyde resin in the dry film before the onset of crosslinking. This system can serve as a model for waterborne basecoat development in many automotive applications. Note de contenu : - EXPERIMENTAL : Materials - Latex characterization - Film formation, annealing, and fluorescence measurements
- FLUORESCENCE DATA AND DATA ANALYSIS
- RESULTS AND DISCUSSION : Latex preparation and characterization - Where is the melamine located ? - Crosslinking, gel content, and swell ratio - Polymer interdiffusion - Core-Shell latex filmsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17853
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 892 (05/1999) . - p. 47-60[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003560 - Périodique Bibliothèque principale Documentaires Disponible 009606 - Périodique Bibliothèque principale Documentaires Exclu du prêt Dyeing recipe prediction of cotton fabric based on hyperspectral colour measurement and an improved recurrent neural network / Jianxin Zhang in COLORATION TECHNOLOGY, Vol. 137, N° 2 (04/2021)
[article]
Titre : Dyeing recipe prediction of cotton fabric based on hyperspectral colour measurement and an improved recurrent neural network Type de document : texte imprimé Auteurs : Jianxin Zhang, Auteur ; Xinen Zhang, Auteur ; Junkai Wu, Auteur ; Chunhua Xiao, Auteur Année de publication : 2021 Article en page(s) : p. 166-180 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
CotonLe coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles).
Prévision, Théorie de la
Réseaux neuronaux (informatique)
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Precise dyeing recipe prediction is important in the final colour reproduction of textile dyeing and printing products. Currently, the widely used dyeing recipe prediction methods based on colour tri-stimulus cannot effectively avoid the metamerism phenomenon. An intelligent dyeing recipe prediction model for cotton fabric dyeing is proposed in this paper based on hyperspectral colour measurement and a deep learning algorithm. The hyperspectral colour measurement can obtain three-dimensional spectral information (X, Y and λ) of fabric samples, and can acquire accurate colour values even with uneven samples if the regional correlation algorithm is used. A deep learning algorithm based on an improved recurrent neural network was then employed to establish the model between spectral reflectance and the dyeing recipe. In total, 343 evenly dyed and 20 unevenly dyed fabric samples were dyed using the dyestuffs of Reactive Red CI 238, Reactive Blue CI 204 and Reactive Yellow CI 206, upon which the recipe prediction model was based, established and evaluated. The experimental results show that the proposed model based on hyperspectral colour measurement and our algorithm can provide higher prediction accuracy for Reactive Red CI 238, Reactive Blue CI 204 and Reactive Yellow CI 206. The relative prediction errors are 3.40%, 2.70% and 3.10%, respectively, for these three types of dyeing recipe, while the relative prediction errors are 19.60%, 22.60% and 11.83%, respectively, using the Datacolor 650 recipe prediction model. Note de contenu : - EXPERIMENTAL : Preparation of colour fabric samples - Colour measurement based on the HIS - Reflectance extraction from the HIS image - Experimental dyeing recipe prediction model
- RESULTS AND DISCUSSION : Feasibility analysis of the HIS for colour measurement - Results analysis for the RC algorithm - Result analysis of the dyeing recipe prediction modelsDOI : https://doi.org/10.1111/cote.12516 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12516 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36076
in COLORATION TECHNOLOGY > Vol. 137, N° 2 (04/2021) . - p. 166-180[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22844 - Périodique Bibliothèque principale Documentaires Disponible A method to improve the performance of wide dye concentration measurement based on the multi-pathlength spectrophotometry / Jianxin Zhang in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)
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Titre : A method to improve the performance of wide dye concentration measurement based on the multi-pathlength spectrophotometry Type de document : texte imprimé Auteurs : Jianxin Zhang, Auteur ; Zhang Kangping, Auteur ; Huang Xuejiao, Auteur Année de publication : 2023 Article en page(s) : p. 117-127 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de teinture -- Analyse
Bleu (couleur)
Colorants
Jaune
Mesure
VioletIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Accurate measurement of dye concentration in a dyebath is a basic step for dyeing process control and dyebath reuse. The dyebath usually covers a wide concentration range. In this article, a method based on multi-pathlength spectroscopy was proposed to improve the test performance for wide dye concentration. Partial least squares regression (PLSR) models were constructed on the combined pathlength spectra and evaluation metrics coefficient of determination (R2) and root mean square error (RMSE) were adopted for performance comparison. Results of the single-component experiment at different pathlengths (10, 5, 3, 2 and 1 mm) showed that for CI Acid Violet 54 and CI Acid Blue 113 the introduction of spectra at the 5 mm pathlength yielded greater performance. Further additions of lower pathlengths spectra were not as favourable as that of the 5 mm pathlength spectra for the models based on 10 mm spectra. While the upper concentration limits for three dyestuffs were raised to 0.50 g/L and 5 and 10 mm pathlengths were selected for further analysis, results demonstrated that the introduction of spectra at the 5 mm pathlength generally promoted the test performance for all three dyestuffs. Based on the results of single-component experiment, 10 and 5 mm pathlengths were eventually decided as the detection pathlengths for three-component solutions, and the concentration ranges of CI Acid Yellow 117, CI Acid Violet 54 and CI Acid Blue 113 were 0.03–0.48, 0.03–0.48 and 0.02–0.40 g/L, respectively. Results of three-component experiments suggested that evaluation metrics for the three dyestuffs were raised from 0.409, 0.409 and 0.980 to 0.957, 0.992 and 0.998, respectively, by the multi-pathlength spectroscopy technique. Note de contenu : MATERIALS AND METHODS : Dyestuffs - Instruments - Methods
RESULTS AND DISCUSSION : Dye concentration measurement of single-component solutions - Dye concentration measurement of three-component mixed solutions
- Table 1 : Abbreviations of combined pathlength
- Table 2 : Test results for solutions of CI Acid Yellow 117
- Table 3 : Test results for solutions of CI Acid Violet 54
- Table 4 : Test results for solutions of CI Acid Blue 113
- Table 5 : Concentration levels of the three-component solutions
- Table 6 : Test results for three-component solutions based on P2DOI : https://doi.org/10.1111/cote.12640 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12640 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39210
in COLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 117-127[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24084 - Périodique Bibliothèque principale Documentaires Disponible