18 résultat(s) recherche sur le tag ''Formation'

Alternate chemistries for film formation / Manoj R. Nair in PAINTINDIA, Vol. L, N° 1 (01/2000)

[article]  inPAINTINDIA > Vol. L, N° 1 (01/2000) . - p. 35 -42 Titre : Alternate chemistries for film formation Type de document : texte imprimé Auteurs : Manoj R. Nair, Auteur ; V. C. Malshe, Auteur Année de publication : 2000 Article en page(s) : p. 35 -42 Langues : Anglais (eng) Tags : 'Matériau  revêtement'  Peinture  'Formation  film'  'Réaction  chimique'  'Mécanisme  réaction' Index. décimale : 667.9 Revêtements et enduits Résumé : Film formation plays a crucial role in the coating industry. The conventional methods used involves film formation by evaporation of solvent, chemical reaction or by coalescence. In the present paper an effort is made to search for new chemistries. The reference for this paper are organic reactions which were not earlier used and these reactions were selected based on some guidelines. An effort is also made in terms of applying it to coating field. This paper has tried to put forth new ideas which may or not be applicable in practice with hpes that a step has been taken in proper direction. The chemisties mentioned here are open for suggestions and modifications. Note de contenu : - Coventional curing chemistries - Guidelines for selection of a reaction for film formation - New reported reactions - Recommandations Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12673 [article]

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Interfacial studies of crosslinked urethanes : part IV. Substrate effect on film formation in polyester waterborne polyurethanes / Marek W. Urban in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 896 (09/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 896 (09/1999) . - p. 73-78 Titre : Interfacial studies of crosslinked urethanes : part IV. Substrate effect on film formation in polyester waterborne polyurethanes Type de document : texte imprimé Auteurs : Marek W. Urban, Auteur ; Claudia L. Allison, Auteur Année de publication : 1999 Article en page(s) : p. 73-78 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Matériau  revêtement'  'Peinture  eau'  émulsion'  'Uréthanne  polymère'  'Formation  film'  Subjectile  'Propriété  surface'  'Tension  superficielle'  'Réaction  interface'  Réticulation  'Etude  expérimentale'  Métal  'Matière  plastique'  Verre Index. décimale : 667.9 Revêtements et enduits Résumé : These studies examine the effect of substrate surface tension on crosslinking reactions in waterborne polyurethanes (PUR) applied to tin-plated steel, steel, polypropylene (PP), thermoplastic olefin (TPO), and glass. The results show that, relative to tin-plated steel, removal of tin-plating from a steel substrate increases isocyanate (NCO) consumption by 42% near the film-substrate (F-S) interface. When PUR is allowed to crosslink on steel, PP, TPO, and glass, the NCO concentration is greater at the film-air (F-A) interface. Furthermore, crosslinking reactions result in a greater amount of urea-hydrogen bonded species near the F-S interface for all substrates. While an increase ofsubstrate surface tension decreases the amount of urea-hydrogen bonded carbonyl groups near the F-S interface, TPO was found to exhibit different behavior due to talc stratification near the surface. In this case, the presence of talc in WB-PUR coatings or thermoplastic substrates decreases the amount of hydrogen-bonded species and increases NCO consumption. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17941 [article]

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Role of particle size on latex deformation during film formation / Charles S. Kan in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 896 (09/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 896 (09/1999) . - p. 89-97 Titre : Role of particle size on latex deformation during film formation Type de document : texte imprimé Auteurs : Charles S. Kan, Auteur Année de publication : 1999 Article en page(s) : p. 89-97 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Peinture  eau'  émulsion'  'Formation  film'  Déformation  'Dimension  particule'  'Température  transition  vitreuse'  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : The ability of latex particles to deform and coalesce to form an integral film upon drying is an important property in many latex coating applications. Many theories have been proposed to account for the origin of the deformation forces. The capillary forces which depend inversely on particle size have been accepted as important for latex deformation and film formation. The minimum film forming temperature (MFFT) has been found to be a function of the particle size of latexes and has been used as evidence that the capillary forces are responsible for film formation. In this study, the deforming force at MFFT has been determined from the moduli of water-equilibrated latex polymers. No particle size dependence was observed. The magnitude of the deforming forces was at least an order of magnitude lower than that predicted by the capillary force theory. Electron microscopy of film formed below the MFFT, a condition that corresponds to early stage film formation, showed significant deformation, indicating that at the beginning of film formation, forces of magnitude predicted by the capillary force theory are present. However, the magnitude of the forces decreases rapidly as film formation progresses. The MFFT particle size dependency can be explained by the difference in the degree of water plasticization. Evidence that latexes of different particle size were plasticized by water to different extents was determined from the Tgs of the latex emulsions. Note de contenu : - EXPERIMENTAL : Materials - Preparation of unseeded latexes - Preparation of seeded latexes - Minimum film formation temperature - Dynamic mechanical spectroscopy - Glass transition temperature of latex emulsion - RESULTS AND DISCUSSION : Effect of particle size on MFFT - Estimation of deformation force in film formation process - Deformation forces in early stage of film formation - effect of latex particle size on the glass transition temperature of latex emulsions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17943 [article]

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The role of surfactant on the film formation of latex polymers / P. Nagarajan in PAINTINDIA, Vol. XLVI, N° 2 (02/1996)

[article]  inPAINTINDIA > Vol. XLVI, N° 2 (02/1996) . - p. 19-24 Titre : The role of surfactant on the film formation of latex polymers Type de document : texte imprimé Auteurs : P. Nagarajan, Auteur ; C. K. Mital, Auteur ; M. K. Trivedi, Auteur Année de publication : 1996 Article en page(s) : p. 19-24 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Latex  'Réseau  polymère  interpénétré'  'Méthacrylate  méthyle  polymère'  'Acrylate  butyle  'Méthacrylique  acide  'Système  ternaire'  'Formation  film'  'Agent  surface'  'Propriété  'Tension  superficielle' Index. décimale : 667.9 Revêtements et enduits Résumé : Two different latex interpenetrating polymer networks (LIPNs), comprising of polyacrylate (methyl methacrylate: n-butyl acrylate: methacrylic acid-43:57: 2.5) as seed and second polymer as polystyrene and polymethyl methacrylate, having a difference in hydrophilicity have been prepared. Surface tension measurements, were carried out to demonstrate the difference in adsorption equilibria of the anionic surfactant, sodium dodecyl sulphate on the different latex particles, with change in pH. the films were cast at different pHs, and it was found that the film of styrene based LIPN at a low pH (3.3), yielded translucent film while transparent films were also obtained from styrene based LIPN at a higher pH of 9, neutralized with NaOH. The higher strength of the latex films, obtained at the pH of 9 than those obtained at pH 3.3 of the styrene based LIPNs, indicates that the reduction in the polymer-water interfacial tension enhances the coalescence. It has been demonstrated clearly by the experimental evidence, that adsorption of surfactant on polymer, in styrene based latexes and the exudation of the surfactant in MMA based latexes, results in major difference in the optical clarity of the latex films. Note de contenu : - Preparation of LIPNs - Surface tension measurements - Transparency of the films - Tensile strength - Spectral measurements Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13390 [article]

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Aqueous polyurethanes - polymer colloids with unusual colloidal, morphological, and application characteristics / R. Satguru in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 830 (03/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 830 (03/1994) . - p. 47-55 Titre : Aqueous polyurethanes - polymer colloids with unusual colloidal, morphological, and application characteristics Type de document : texte imprimé Auteurs : R. Satguru, Auteur ; J. McMahon, Auteur ; J. C. Padget, Auteur ; R. G. Coogan, Auteur Année de publication : 1994 Article en page(s) : p. 47-55 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Peinture  eau'  Liant  'Uréthanne  polymère'  'Dispersion  colloïdale'  Granularité  Morphologie  'Formation  film'  Feuil  'Propriété  mécanique'  Dureté Index. décimale : 667.9 Revêtements et enduits Résumé : Aqueous polyurethane dispersions are becoming an increasingly important class of materials in the surface coatings industry. Because of the synthetic procedure employed in the preparation of aqueous polyurethanes, they differ significantly from typical emulsion polymers in terms of colloid stability characteristics and particle morphology. Fluorescence spectroscopy and small angle neutron scattering techniques demonstrated that the particles in a polyurethane dispersion are swollen with water. The consequences of this morphology in terms of the ability to combine low film forming temperature with good film hardness is discussed. The particle size distribution of aqueous polyurethanes was found to be broader than that of typical emulsion polymers. Results are presented which demonstrate how control over average particle size and colloid stability can be achieved in aqueous polyurethanes. Note de contenu : - INTRODUCTION : Polyurethane dispersions - RESULTS AND DISCUSSION : Cooloidal porperties-particle size distribution - Colloid stability - Particle size control - Particle morphology - Film formation and film hardness Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18608 [article]

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Catalytic curing of industrial OEM coatings - Part I / D. S. Hardas in PAINTINDIA, Vol. XLV, N° 6 (06/1995)

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Drying of alkyd emulsion paints / P. K. Weissenborn in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 906 (07/2000)

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Flow properties of fluid systems / A. Davey in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 7 (07/1997)

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Water-borne fluoroelastomeric coatings with high barrier properties / T. Poggio in SURFACE COATINGS INTERNATIONAL, Vol. 78, N° 7 (07/1995)

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Films formed from polystyrene latex/clay composites : A fluorescence study / Saziye Ugur in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 7 (07/2005)  

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Free volume distribution during consolidation and coalescence of latex films / A. J. Hill in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 913 (02/2001)

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Quantification of simultaneous solvent evaporation and chemical curing in thermoset coatings / Søren Kiil in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 5 (09/2010)  

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Water penetration behavior in water-assisted injection molding (WAIM) : A study of product quality for different process and material parameters / Sofie Sannen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)  

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Drying characteristics of low odour alkyd paints / Elizabeth Reck in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/98 (11/1998)  

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Self stratifying coating : A review / Sudip Nath in PAINTINDIA, Vol. LII, N° 10 (10/2002)

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The case of... the strange blistering in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 27, N° 5 (05/2010)

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The derivation and analysis of a model of the drying process of a paint film / S. K. Wilson in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 4 (04/1997)

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The origin of film defects caused by electrolyte in electropaints / W. C. Ledger in SURFACE COATINGS INTERNATIONAL, Vol. 78, N° 9 (09/1995)

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