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The influence of different shapes and size distributions of coating pigments on packing and dewatering / Jae Y. Shin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)
[article]
Titre : The influence of different shapes and size distributions of coating pigments on packing and dewatering Type de document : texte imprimé Auteurs : Jae Y. Shin, Auteur ; Hak Lae Lee, Auteur Année de publication : 2020 Article en page(s) : p. 1425–1436 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Déshydratation
Dispersions et suspensions
Emballages
Formes des particules
Granulométrie
Papier et carton couché
Pigments
Revêtements
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : Particle shape and particle-size distribution (PSD) are important factors for pigment packing and water retention in the pigment coating process, being closely associated with many runnability problems. Diverse experimental investigations on the packing and dewatering of pigment slurries have been made. However, theoretical approaches remain lacking. This paper presents a joint experimental and theoretical analysis of the influence of pigment shape and PSD on pigment packing and dewatering. The relative viscosities of very dilute pigment slurries were measured and used to determine the intrinsic viscosity, based on the Einstein equation. The deviation of pigment shape from spherical caused an increase in viscosity of the slurries. Acicular precipitated calcium carbonates gave lower shape factor values than platy clay particles, which indicated that the needle-like particles could rotate more easily around their long axes under shearing conditions. The packing of pigments, which determines porosity, permeability, light scattering, and mechanical properties, was examined. The packing volumes of nonspherical pigments were estimated based on their respective PSDs, using an algorithm developed for spherical particles, modified with a correction factor. This model is based on the close random-packing volume fraction (∅2p) of particles of uniform size being an independent variable, regardless of their shape. Therefore, it was valid as long as the particles always achieve the same close random-packing volume (∅1p) by sedimentation or tapping. Overall, the effect of the particle shape and PSD on the dewatering and filter-cake permeability (Kf) was analyzed. The dewatering rates were measured with a common pressure filtration method, and the permeability of the filter cakes was obtained by fitting the data to a filtration equation. The particle size and PSD were found to influence the permeability constant, but there was little correlation between the permeability and particle shape. Note de contenu : - MATERIALS AND METHODS : Particle size distribution of pigments and SEM images - Characterization of pigments by viscosity measurement - Sedimentation volume of dispersion - Dewatering rate
- THEORY AND CALCULATION : Model development - New approach
- RESULTS AND DISCUSSION : Particle-size distribution of pigments - Effect of electrolyte on viscosity - Aspect ratio of pigment particles - Sedimentation volume of dispersion by centrifugation - Packing volume fractions of nonspherical particles - Dewatering and permeability of filter cakeDOI : https://doi.org/10.1007/s11998-020-00371-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00371-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34949
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1425–1436[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22458 - Périodique Bibliothèque principale Documentaires Disponible The influence of methacrylic acid and urethane methacrylate on the film properties of hybrid urethane–acrylic latexes in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)
[article]
Titre : The influence of methacrylic acid and urethane methacrylate on the film properties of hybrid urethane–acrylic latexes Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 1557-1577 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Composés organiques -- Synthèse
Copolymère uréthane acrylique
Extrait sec
Formation de film
Formulation (Génie chimique)
Granulométrie
Méthacrylate d'uréthane
Méthacrylique, AcideL'histoire de l'acide méthacrylique commence en 1865, année où il est synthétisé pour la première fois à partir du méthacrylate d'éthyle.
L'acide méthacrylique est très réactif avec les groupes carboxyles, vinyles et esters.
Poids moléculaires
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements organiques
Transition vitreuse
ViscoélasticitéIndex. décimale : 667.9 Revêtements et enduits Résumé : A non-isocyanate pathway was used to synthesize a urethane methacrylate monomer, 2-((methylcarbamoyl)oxy)ethyl methacrylate (MEM) and methacrylic acid (MAA). The MEM and MAA mixture was copolymerized with MMA and BA in a semicontinuous monomer-starved process to prepare latexes via emulsion polymerization. Varying amounts of MEM and MAA monomers were introduced to the latex, and their effect on the thermal properties, film formation, viscoelastic, mechanical and morphological properties was examined. The upper limit functionality concentration was evaluated based on the latex stability. Incorporation of MEM and MAA in latexes enhanced film formation properties displayed by lowering MFFT. MEM and MAA functionalized latexes exhibited enhanced Young’s modulus, tensile strength and hardness compared to the control latex without any MEM and MAA. Note de contenu : - EXPERIMENTAL : Materials - Instrumentation - Synthesis of monomers and latexes - Synthesis of latexes - Latex characterization
- RESULTS : Characterization of MEM+MAA - Latex conversion, particle size and molecular weight - Thermal properties and film formation - Viscoelastic properties - Mechanical properties - Morphological properties—TEM - Morphological properties—AFM - Coatings properties
- Table 1 Latex formulations for 0, 2, 5 and 10 mol% MEM+MAA
- Table 2 Solids content, overall conversion, particle size and Mw− results of MEM+MAA latexes
- Table 3 Glass transition temperature, minimum film formation temperature, and their difference for MEM+MAA latexes
- Table 4 Viscoelastic properties of MEM+MAA latexes as a function of increasing functionality of MEM+MAA
- Table 5 Roughness data for 0, 2, 5 and 10 mol% MEM+MAA latex
- Table 6 Coatings tests results for MEM+MAA latexes as a function of increased functionality from 0 to 10 mol%DOI : https://doi.org/10.1007/s11998-021-00497-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00497-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36808
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Code-barres Cote Support Localisation Section Disponibilité 23146 - Périodique Bibliothèque principale Documentaires Disponible Thermal sensitive agents for making stimuli responsive leathers / Jaya Prakash Alla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 12 (12/2020)
[article]
Titre : Thermal sensitive agents for making stimuli responsive leathers Type de document : texte imprimé Auteurs : Jaya Prakash Alla, Auteur ; Nishad Fathima Nishter, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2020 Article en page(s) : p. 459-469 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Caractérisation
Colorimétrie
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Eaux usées -- Analyse
Granulométrie
Matériaux intelligents
Matériaux sensibles aux stimulis
Polyacryliques
SyntansIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Herein, we report the synthesis and application of a smart polymeric acrylic syntan (synthetic tanning material), which can respond to temperature and pH. Behavior of polymer at different pH (1-10) at room temperature (28°C) was studied. Also interactions with collagen were ascertained in order to understand the polymers’ response towards secondary structures of collagen. Leather made using the experimental syntan demonstrated higher temperature resistance of 3±0.5°C compared to control syntan treated leathers (1±0.5°C) when exposed to heat under artificial simulation. Experimental leathers exhibited better strength and organoleptic properties. These smart leathers find its application in extreme climatic conditions of heat or cold. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of thermoresponsive acrylic syntan - Collagen polymer interaction studies - Characterization of thermoresponsive syntan - Leather processing and syntan application - Scanning Electron Microscopy (SEM) study of polymer treated leathers - Thermal analysis - Physical strength and organoleptic properties of leather - Effluent parameters
- RESULTS AND DISCUSSION : Characterization of thermoresponsive syntan - Clouding behaviour of thermoresponsive polymer - Polymer interaction with collagen - Application of syntan in leather making - Infrared thermal imaging of syntan treated leathers - Scanning electron microscopy of leathers - Physical testing of leather - Porosity analysis of leather - Color measurement of leather - Organoleptic properties - Wastewater analysis
- Fig. 1 : Particle size distribution of control and experiment (MTP02)
- Fig. 2 : Clouding behaviour of polymer at room temperature
- Fig. 3 : Fourier transform infrated spectroscopy analysis of collagen and collagen-polymer (CP) samples
- Fig. 4 : Circular dichroism spectra for understanding stability of collagen-polymer interactions
- Fig. 5 : Digital images of a) control, c) experimenta, infra-red images of b), control d) experimental syntan treated leather
- Fig. 6 : Scanning electron microscopy images showing grain surface of a) control, b) experimental leathers at 50X, cross section images of c) control and d) experiment at 150x magnification
- Table 1 : Clouding behaviour of the polymer at different pH
- Table 2 : Temperature difference exhibited by control and experimental leathers
- Table 3 : Physical strength properties of control and experimental syntan treated leather
- Table 4 : Color values of control and experimental leathers
- Table 5 : Analysis of waste waterDOI : https://doi.org/10.34314/jalca.v115i12.4203 En ligne : https://drive.google.com/file/d/1a7TMFMOQXQr-7hriJSccnrihBn-0sjL_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34999
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 12 (12/2020) . - p. 459-469[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22510 - Périodique Bibliothèque principale Documentaires Disponible Timing of polyethylene glycol addition for the control of SiO2 sol structure and sol–gel coating properties / Youlai Xiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)
[article]
Titre : Timing of polyethylene glycol addition for the control of SiO2 sol structure and sol–gel coating properties Type de document : texte imprimé Auteurs : Youlai Xiang, Auteur ; Xiaoguang Li, Auteur ; Ai Du, Auteur ; Shuai Wu, Auteur ; Jun Shen, Auteur ; Bin Zhou, Auteur Année de publication : 2017 Article en page(s) : p. 447–454 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de silicium
Granulométrie
Morphologie (matériaux)
Polyéthylène glycol
Revêtements -- Propriétés optiques
Revêtements:Peinture
Sol-gel, Procédé
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyethylene glycol (PEG) was added during the sol process of sol–gel SiO2 coating preparation to investigate the effect of PEG addition timing on particle growth, sol structure, and coating properties. When PEG was added before the addition of the catalyst, the particle size increased from 10 nm (in sol without PEG) to 20 nm, and the necessary aging time for dip coating was shortened from 5 days (in sol without PEG) to ~30 h. When PEG was added 24 h later than the catalyst, the uniform sol structure and small particle unit were obtained. With the delay of the PEG addition timing to 120 h, the improvement in the homogeneity of the sol was continued, whereas the porosity of the resulting coatings decreased. The refractive index of PEG-modified SiO2 coatings can be adjusted in a continuous range between 1.14 and 1.20, using the timing when the PEG was added. The highest peak transmittance of glass that was coated with PEG-modified silica coatings reached 99.90%. All the coatings can be changed from hydrophilic to hydrophobic after hexamethyldisilazane vapor modification. Note de contenu : - EXPERIMENTAL : Preparation of SiO2 sols and coatings
- RESULTS : Viscosity of sols - Particle size and particles distribution - Surface morphology and composition of coatings - Optical properties of coatings - Porosity and wettability of coatingsDOI : 10.1007/s11998-016-9864-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9864-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28159
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Code-barres Cote Support Localisation Section Disponibilité 18781 - Périodique Bibliothèque principale Documentaires Disponible Titanium dioxide grafted with silane coupling agents and its use in blue light curing ink / Lili Wang in COLORATION TECHNOLOGY, Vol. 136, N° 1 (02/2020)
[article]
Titre : Titanium dioxide grafted with silane coupling agents and its use in blue light curing ink Type de document : texte imprimé Auteurs : Lili Wang, Auteur ; Xiaying Jiang, Auteur ; Chenglong Wang, Auteur ; Yi Huang, Auteur ; Yiding Meng, Auteur ; Jianzhong Shao, Auteur Année de publication : 2020 Article en page(s) : p. 15-22 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact
Bleu (couleur)
Caractérisation
Dioxyde de titane
Dispersions et suspensions -- Stabilité
Encre
Encre -- Propriétés mécaniques
Fourier, Spectroscopie infrarouge à transformée de
Granulométrie
Greffage (chimie)
Photoréticulation
Réaction de couplage
Rhéologie
Silanes
ThermogravimétrieIndex. décimale : 667.2 Colorants et pigments Résumé : To improve the properties of titanium dioxide particles and realise their firm anchorage in blue light curing film, three modified titanium dioxide particles were prepared by grafting 3-(trimethoxysilyl)propyl methacrylate, 3-aminopropyltriethoxysilane and hexadecyltrimethoxysilane. The surface changes of titanium dioxide particles after modification were characterised. The dispersion stability, photo-polymerisation, rheological and mechanical properties of modified titanium dioxide blue light curing inks were investigated. Results showed that compared with native titanium dioxide, modified titanium dioxide particles were more appropriate for blue light curing ink. The particle sizes of the three modified titanium dioxide particles became smaller, their surfaces exhibited hydrophobicity, and the viscosity of the modified titanium dioxide inks decreased slightly. Of the three modified titanium dioxide particles, 3-(trimethoxysilyl)propyl methacrylate- and hexadecyltrimethoxysilane-modified titanium dioxide particles exhibited better dispersion stability in blue light curing ink. In particular, 3-(trimethoxysilyl)propyl methacrylate-modified titanium dioxide blue light curing ink showed the best photo-polymerisation and mechanical properties, which indicated the participation of the pigment grafted by double bonds in the blue light curable polymerisation. Using modified titanium dioxide in blue light curing ink, the dry/wet rubbing fastness of the printed fabrics improved. Note de contenu : - EXPERIMENTAL : Materials - Grafting of silane coupling agent onto the surface of titanium dioxide particles - Preparation of blue light curing ink - Preparation of blue light curing - Characterisations
- RESULTS AND DISCUSSION : FT-IR spectroscopy of modified titanium dioxide - Thermogravimetric analysis of modified titanium dioxide - Elemental analysis of modified titanium dioxide - Particle size analysis of modified titanium dioxide - Contact angle analysis of modified titanium dioxide - Dispersion stability of modified titanium dioxide - Rheological porperties of modified titanium dioxide bluelight curing inkDOI : https://doi.org/10.1111/cote.12434 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12434 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33696
in COLORATION TECHNOLOGY > Vol. 136, N° 1 (02/2020) . - p. 15-22[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21546 - Périodique Bibliothèque principale Documentaires Disponible Tone in tone dyeing : attempt to use dye encapsulated silica nanospheres in leather dyeing / Sathya Ramalingam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 12 (12/2018)
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