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Advances in fluoropolymer dispersions / T. Poggio in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B1 (02/2004)
[article]
Titre : Advances in fluoropolymer dispersions Type de document : texte imprimé Auteurs : T. Poggio, Auteur ; V. Kapeliouchko, Auteur ; V. Arcella, Auteur ; E. Marchese, Auteur Année de publication : 2004 Article en page(s) : p. 51-56 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Dispersions et suspensions
Emulsions
Microémulsions
Polymérisation en émulsion
Polytétrafluoréthylène
Résistance à l'abrasion
Revêtements organiques
Stabilisants (chimie)
SurfactantsIndex. décimale : 667.9 Revêtements et enduits Résumé : Multimodal high-performance fluoropolymer dispersions have been developed thanks to Solvay Solexis' proprietary technology which permits bimodal particle-size distributions to be obtained, not only by blending standard fluoropolymer dispersions (diameter 250nm) with nano-latexes (diameter from 10 to 60nm), but also directly from polymerisation, exploiting a competitive homogeneous/coagulative and droplet nucleation mechanism. It has been found that poly(tetra-fluoroethylene) (PTFE) bimodal dispersions have optimal film-forming and particle-packing behaviour at a size ratio of about 0.15, corresponding with the best fit to the random close-packing model, while no significant improvements are observed when the aforesaid size ratio is 0.3. Note de contenu : - LATEX PREPARATION AND CHARACTERISATION : Emulsion polymerisation - Microemulsion polymerisation - Direct polymerisation of bimodal dispersions
- RESULTS AND DISCUSSION : Dispersions stabilised with phenol-free non-ionic surfactants - Coating characteristics - Further developments
- Table 1 : PTFE dispersion characteristics
- Table 2 : Nano-PTFE dispersion characteristics
- Table 3 : Composition ranges of PTFE/nano-PTFE blends
- Table 4 : PTFE bimodal dispersions obtained directly from polymerisation
- Table 5 : Film roughness measured by AFM analysis
- Table 6 : Coating anticorrosive characteristics. All blends contain 15% of nano-particles
- Table 7 : Low-APFO coating characteristicsDOI : 10.1007/BF02699565 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699565.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5502
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B1 (02/2004) . - p. 51-56[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000392 - Périodique Bibliothèque principale Documentaires Disponible Aliphatic anionic polyurethane microemulsion leather filling-retanning agent / Bao Lihong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)
[article]
Titre : Aliphatic anionic polyurethane microemulsion leather filling-retanning agent Type de document : texte imprimé Auteurs : Bao Lihong, Auteur ; Lan Yunjun, Auteur ; Shufen Zhang, Auteur Année de publication : 2007 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Caractérisation
Charges (matériaux)
Chimie analytique
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Formulation (Génie chimique)
Imperméabilisation
Microémulsions
Poids moléculaires
Polymères aliphatiques
Polyuréthanes
RetannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The retanning process plays an important role in optimizing the leather’s colour, levelness, softness, fullness, and hydrophobicity. Polymer retanning agents are important materials for this process. The present study used maleic anhydride modified castor oil (MCO), PEG1000 (polyethylene glycol) and IPDI (isophorone diisocyanate) as main materials to synthesize polyurethane microemulsions (MC-PURs) and employed them to retan chrometanned leathers. The hydroxyl functionality of MCO was investigated by chemical and 1HNMR analysis, and confirmed to be about 2.0. The chemical structures of MCO, prepolymer and MC-PUR were characterized by IR.
The optimized synthesis formulation and polyurethane microemulsion MC-PUR3 for MC-PURs as retanning agent was selected by comparing the properties of retanned leathers, such as softness, fullness, grain tightness, tensile strength, extension at break, depth of shade, waterproof properties et al. Then, MC-PUR3 was characterized by means of DSC, TG/DTG and TEM techniques. SEM microgram of MC-PUR3 retanned leather shows that the fibres are well dispersed.Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of maleic anhydride modified castor oil (MCO) - Preparation of microemulsions of polyurethane filling retanning agents (MC-PURs) - Determination of molecular weight - H n.m.r. spectroscopy - Purification - FT-IR spectroscopy - Differential scanning spectroscopy - Thermo-gravimetric analysis - Transmission electron microscope analysis - Measurement of final dyebath exhaustion - Physical and waterproofness properties of leathers - Organoleptic properties of the final leathers - Scanning electron microscopic analysis
- RESULTS AND DISCUSSION : Determination of the average molecular weight, hydroxyl number and average hydroxyl functionality (Fn(OH)) of MCO - Determination of the average hydroxyl functionality of MCO by chemical analysis - Determination of the average hydroxyl functionality of MCO by 1HNMR - Chemical structure analysis by IR
- OPTIMIZATION OF RETANNING AGENT : Effect of MCO/PEG1000 mass ratio on the properties of retanned leathers - Effect of carboxyl content of MC-PUR on the properties of retanned leathers - Effect of NCO/OH molar ratio on the properties of retanned leathers - Thermal properties of MC-PUR3
- Table 1 : Basic formulations of MC-PURs
- Table 2 : Filling, retanning and wet finishing processes
- Table 3 : Effect of MCO/PEG1000 mass ratio on the properties of retanned leathers
- Table 4 : Effect of carboxyl content of MC-PUR on the properties of retanned leathers
- Table 5 : Effect of NCO/OH molar ratio on the properties of retanned leathersEn ligne : https://drive.google.com/file/d/19ti2BicD3kfHFF4Z4QLX1cSWPC0J39gs/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39037
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 73-80[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire 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]
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 splitsEn ligne : https://drive.google.com/file/d/1GoIENUWkqhu85g-LTxdP-0cZzXD-IvPo/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39249
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 4 (07-08/2005) . - p. 164-168[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Application of neem and karanjia oils as natural pesticide microemulsion systems / S. Ghosh in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 47, N° 6/2010 (11-12/2010)
[article]
Titre : Application of neem and karanjia oils as natural pesticide microemulsion systems Type de document : texte imprimé Auteurs : S. Ghosh, Auteur ; D. N. Bhowmick, Auteur ; Ashish Pratap Singh, Auteur Année de publication : 2010 Article en page(s) : p. 369-375 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Huile de karanja et constituants
Huile de neem
Microémulsions
PesticidesUn pesticide est une substance répandue sur une culture pour lutter contre des organismes considérés comme nuisibles. C'est un terme générique qui rassemble les insecticides, les fongicides, les herbicides, les parasiticides.
Produits naturelsIndex. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Microemulsions are preferred over conventionally used pesticide systems for their long term thermodynamic stability, low viscosity, cost economy and aesthetic appeal. Such systems provide a method for preparing an isotropic mixture of oil and water. Neem and Karanjia isolates have proven activities. Therefore, uses of these oils provide a biologically and environmentally acceptable pesticide formulation. The present investigation deals with the systematic study to arrive at the economical composition for formulating microemulsion systems using these oils. These microemulsions, when diluted with water, formed macroemulsions which were stable over an extended period of time. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10296
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 6/2010 (11-12/2010) . - p. 369-375[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012617 - Périodique Bibliothèque principale Documentaires Disponible Artificial intelligence for electrical percolation of AOT-based microemulsions prediction / Antonio Cid in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 6 (11-12/2011)
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Titre : Artificial intelligence for electrical percolation of AOT-based microemulsions prediction Type de document : texte imprimé Auteurs : Antonio Cid, Auteur ; Gonzalo Astray, Auteur ; J. A. Manso, Auteur ; Juan Carlos Mejuto, Auteur ; Oscar Adrian Moldes, Auteur Année de publication : 2011 Article en page(s) : p. 477-483 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Microémulsions
Percolation
Prévision, Théorie de la
Réseaux neuronaux (informatique)
SurfactantsIndex. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Different Artificial Neural Network architectures have been assayed to predict percolation temperature of AOT/i-C8/H2O microemulsions. A Perceptron Multilayer Artificial Neural Network with five entrance variables (W value of the microemulsions, additive concentration, molecular weight of the additive, atomic radii and ionic radii of the salt components) was used. Best ANN architecture was formed by five input neurons, two middle layers (with eleven and seven neurons respectively) and one output neuron. Root Mean Square Errors (RMSEs) are 0.188C (R = 0.9994) for the training set and 0.64 °C (R = 0.9789) for the prediction set. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12616
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 6 (11-12/2011) . - p. 477-483[article]Réservation
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