An acrylic resin retanning agent with a reinforcing effect - Synthesised by hihg solids content microemulsion copolymerization / Wang Xuechuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 4 (07-08/2005)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 4 (07-08/2005) . - p. 164-168 Titre : An acrylic resin retanning agent with a reinforcing effect - Synthesised by hihg solids content microemulsion copolymerization Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; An Huari, Auteur ; Sun Ming, Auteur ; Luo Yanhong, Auteur ; Feng Jianyan, Auteur Année de publication : 2005 Article en page(s) : p. 164-168 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Copolymères en émulsion Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de porcs Granulométrie laser Haut extrait sec Latex Microémulsions Polyacryliques Polymérisation en émulsion Retannage Tannage organique Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An acrylic resin nano-size latex whose colloidal particle size was about 20nm and solids content about 25% was prepared by a high solids content semicontinuous microemulsion copolymerization. The experimental product was employed in retanning drop [bottom] splits of pigs aiming to reinforce the leather. The offer of cross-linking agent and functional monomer were varied in the copolymerization experiment and their effect on the reinforcing function was investigated. The effect of colloidal particle size and dosage of nano-size latex on the reinforcing function also was verified. The particle size of the latex was tested with a laser particle size analyzer, and the composition of the copolymer was analyzed by infrared spectrometry. Multifunction material test equipment was used in the physical testing of the retanned leather. The result of the experiment showed: when the dosage of divinylbenzene (DVB) was 1.2% and the dosage of acrylic acid (AA) 0.8%, the reinforcing performance was the highest. When the colloidal particle size decreased from 64.2nm to 16.3nm, the reinforcing effect was also enhanced. The tensile strength increased by 68%, and the tear strength improved 44% after the drop splits of pigs were retanned with 2% acrylic resin nano-size latex (with respect to the shaved wet blue weight). The effect of the dosage of sodium lauryl sulphate (SLS), n-pentanol (PA), ammonium persulfate (ASP) and AA on the colloidal particle size was also studied. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Synthesis - APPLICATION OF NANO-SIZE LATEX IN RETANNING CHROME TANNED PIG DROP SPLITS : Characterization - RESULTS AND DISCUSSION : Colloidal particle size of the microemulsion copolymer - The IR spectra of BA/MMA/DVB copolymers prepared by microemulsion copolymerization - The effect of functional monomer on the reinforcing function - The effect of cross-linking agent on the reinforcing function - The effect of colloidal particle size on the reinforcing function - The relationship between dosage of retanning agent and reinforcing effect - Table 1 : Recipes used in the series of experiments and average particle size of synthesized latexes - Table 2 : Process details for the retanning applications of nano-size latex on wet blue pig drop splits En ligne : https://drive.google.com/file/d/1GoIENUWkqhu85g-LTxdP-0cZzXD-IvPo/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39249 [article]

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Laser diffraction measurements of pigment size distributions of coatings and mill bases: implications of dilution medium and dispersion process parameters / Shicong Luo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 899-917 Titre : Laser diffraction measurements of pigment size distributions of coatings and mill bases: implications of dilution medium and dispersion process parameters Type de document : texte imprimé Auteurs : Shicong Luo, Auteur ; Claus Erik Weinell, Auteur ; Søren Kiil, Auteur Année de publication : 2023 Article en page(s) : p. 899-917 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Broyeurs à billes Dioxyde de titane Dispersions et suspensions Formulation (Génie chimique) Granulométrie laser Microscopie Oxyde de cuivre Pigments Polyacryliques Qualité -- Contrôle Index. décimale : 667.9 Revêtements et enduits Résumé : Coating properties, such as gloss, rheology, and exterior durability, are strongly affected by the particle size distribution (PSD) of pigment agglomerates. Consequently, moving from the industrial practice of a maximum agglomerate size evaluation after dispersion (i.e., grindometer readings) to an accurate measurement of the entire PSD, holds a promising potential for quality control, product optimization, and research. The aim of the present work was to develop an analysis procedure, based on laser diffraction, for PSD measurements of coatings. In the experiments, acrylic-based TiO2 or Cu2O predispersions (i.e., mill bases), with variations in the composition and dispersion parameters, were investigated. Results show that the laser diffraction measurements are influenced by the so-called obscuration value of the diluted sample, the equipment-input refractive index values, and the shape assumption for the pigment agglomerates. Furthermore, the unavoidable sample dilution, prior to a measurement, strongly affects the stability of primary particles and agglomerates. When using a mixture of the pertinent binder and solvent, as opposed to the pure solvent only, and taking rheology issues into consideration, solvent shock was avoided and reliable PSDs could be obtained. The new analytical procedure was used on selected dispersions with variations in coating formulations and equipment operational parameters and allowed for precise detections of the developments in PSDs and volume-moment mean diameters. In summary, the principle of laser diffraction, with proper control of the measurement conditions, was demonstrated to be a reliable technique for PSD evaluation of coatings and predispersions. Note de contenu : - EXPERIMENTAL : Raw materials - Predispersion systems investigated - Dispersion instruments - Laser diffraction particle size analyzer - Scanning electron microscope (SEM) - Digital microscope - Fineness of grind gauge - RESULTS AND DISCUSSION : Pigment size measurements with digital microscopy - Pigment size measurements with electron microscopy - Sensitivity analysis of the user-supplied parameters for the laser diffraction method - Particle shape - Comparison between grind gauge and laser diffraction - PSD measurements of TiO2 - Absence of reagglomeration - Effects on the PSD results of formulation and operational parameters - PSD results of Cu2O obtained using the laser diffraction method - Table 1 : Overview of particle size measuring techniques - Table 2 : Details of pigments used in the experiments - Table 3 : Formulation details of predispersions - Table 4 : Recommended parameters for the laboratory scale high-speed disk disperser - Table 5 : Selected (present investigation) and recommended parameter values for the lab-scale, high-speed bead mill - Table 6 : Details of beads used in the lab-scale, high-speed bead mill - Table 7 : Equivalent spherical diameter of pigment powders, measured using STEM and subsequent image analysis supported by a python code - Table 8 : Volume-moment mean diameter of TiO2-HS1 sample for four obscuration values DOI : https://doi.org/10.1007/s11998-022-00742-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00742-7.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39436 [article]

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Poudres pour revêtement. Partie 13 : Analyse granulométrique par diffraction laser - Norme ISO 8130-13 / International Organization for Standardization (Genève, Suisse) / Geneve [Switzerland] : International Organization for Standardization (ISO) (2001)

Titre de série : Poudres pour revêtement Titre : Partie 13 : Analyse granulométrique par diffraction laser - Norme ISO 8130-13 Type de document : texte imprimé Auteurs : International Organization for Standardization (Genève, Suisse) , Auteur Mention d'édition : 1re édition Editeur : Geneve [Switzerland] : International Organization for Standardization (ISO) Année de publication : 2001 Importance : III-4 p. Format : 30 cm Langues : Français (fre) Catégories : Granulométrie laser Revêtements -- Analyse Revêtements -- Normes:Peinture -- Normes Revêtements poudre Vernis -- Normes Index. décimale : 667.9 Revêtements et enduits Résumé : La présente partie de l'ISO 8130 fait partie d'une série de normes relatives à l'échantillonnage et à l'essai des peintures, vernis et produits assimilés. Elle spécifie une méthode de détermination par diffraction laser de la distribution granulométrique des poudres pour revêtement assimilées à des particules sphériques. elle convient à la distinction entre particules dont la taille est comprise dans une plage de 1 µm à 300 µm. Cette méthode est applicable uniquement aux poudres sèches. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31301

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