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Perfect layers : a novel class of waterborne 2 components isocyanate curing resins / Tijs Nabuurs in DOUBLE LIAISON, N° 574 (05/2010)
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Titre : Perfect layers : a novel class of waterborne 2 components isocyanate curing resins Type de document : texte imprimé Auteurs : Tijs Nabuurs, Auteur ; Willem-Jan Soer, Auteur ; Wendy van Bavel, Auteur ; Jelle van der Werf, Auteur Année de publication : 2010 Article en page(s) : p. 24-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Revêtements en phase aqueuse:Peinture en phase aqueuse Tags : 'Peinture émulsion' Bi-composants Icosyanate 'Blister free film thichness (BFFT)' Formulation Index. décimale : 667.6 Peintures Résumé : Coalescents are critical in every waterborne paint formulation. Both the concentration and the type of co-solvent can have a profound effect on film properties. By using specially designed solvent free secondary polyol emulsions, so called NOVOS emulsions, the effect of various co-solvents on the film performance of waterborne 2 component polyisocyanate crosslinking coatings could be determined. Especially the evaporation rate of co-solvents has a strong effect on properties such as drying time, chemical resistance and König hardness. Coatings with a slowly evaporating coalescent yielded longer tack free times, reduced König hardness and in some cases even reduced chemical resistances. When co-solvents with a high evaporation rate were used, teck free times were achieved that were even shorter than that of solvent free formulations. It was shown that evaporation of water is accelerated when using fast solvents. Formulations containing no coalescent at all showed a very promising set of film properties, with high König hardness, short tack free times and very good chemical resistances, thus providing the ideal approach to zero-VOC coatings. Because of the nature by which the NOVOS emulsions are prepared, the concentration of acid rich polymer chains is much reduced. This causes the resulting binders to have significantly improved blister free film thickness (BFFT) compared to traditional secondary emulsions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9582
in DOUBLE LIAISON > N° 574 (05/2010) . - p. 24-30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012225 - Périodique Bibliothèque principale Documentaires Disponible Performance of different water-based resins in the formulation of intumescent coatings for passive fire protection / D. Strassburger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)
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[article]
Titre : Performance of different water-based resins in the formulation of intumescent coatings for passive fire protection Type de document : texte imprimé Auteurs : D. Strassburger, Auteur ; M. R. Silveira, Auteur ; Alessandra Fiorini Baldissera, Auteur ; C. A. Ferreira, Auteur Année de publication : 2023 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Enrobage (technologie)
Epoxydes
Formulation (Génie chimique)
Intumescence (chimie)
LignineLa lignine est un des principaux composants du bois, avec la cellulose, l'hémicellulose et des matières extractibles. La lignine est présente principalement dans les plantes vasculaires et dans quelques algues. Ses principales fonctions sont d'apporter de la rigidité, une imperméabilité à l'eau et une grande résistance à la décomposition. Toutes les plantes vasculaires, ligneuses et herbacées, fabriquent de la lignine. Quantitativement, la teneur en lignine est de 3 à 5 % dans les feuilles, 5 à 20 % dans les tiges herbacées, 15 à 35 % dans les tiges ligneuses. Elle est moindre pour les plantes annuelles que pour les vivaces, elle est maximum chez les arbres. La lignine est principalement localisée entre les cellules (voir parois pectocellulosiques), mais on en trouve une quantité significative à l'intérieur même de celles-ci. Bien que la lignine soit un réseau tridimensionnel hydrophobe complexe, l'unité de base se résume essentiellement à une unité de phénylpropane. La lignine est le deuxième biopolymère renouvelable le plus abondant sur la Terre, après la cellulose, et, à elles deux, elles cumulent plus de 70 % de la biomasse totale. C'est pourquoi elle fait l'objet de recherches en vue de valorisations autres que ses utilisations actuelles en bois d'œuvre et en combustible.
Voie de biosynthèse : La lignine est une molécule dont le précurseur est la phénylalanine. Cet acide aminé va subir une cascade de réactions faisant intervenir une dizaine de familles d'enzymes différentes afin de former des monolignols. Ces enzymes sont : phénylalanine ammonia-lyase (PAL), cinnamate 4-hydroxylase (C4H), 4-coumarate:CoA ligase (4CL), hydroxycinnamoyl-CoA shikimate/quinate hydroxycinnamoyl transferase (HCT), p-coumarate 3-hydroxylase (C3H), caffeoyl-CoA o-methyltransferase (CCoAOMT), cinnamoyl-CoA reductase (CCR), ferrulate 5-hydroxylase (F5H), caffeic acid O-methyltransferase (COMT) et cinnamyl alcohol deshydrogenase (CAD). Dans un certain nombre de cas, des aldéhydes peuvent également être incorporés dans le polymère.
Polyacryliques
Polyalkydes
Polyphosphate d'ammonium
Protection passive contre l'incendiela protection passive contre l’incendie dans les bâtiments est essentiellement préventive. Elle représente l’ensemble des mesures constructives permettant à un ouvrage ou une partie d’ouvrage de résister à un incendie pendant un temps prédéterminé fixé par la réglementation de construction en vigueur pour le type de bâtiment concerné. Ces mesures sont destinées à : stopper la progression des fumées, éviter la propagation des flammes, maintenir la stabilité au feu des éléments de structure le plus longtemps possible malgré l’action d’un incendie, contenir les effets thermiques le plus longtemps possible à la zone sinistrée.
La principale spécificité de la protection passive est que dès le début d’un incendie, elle fonctionne sans aucune intervention humaine ni aucun apport extérieur d’énergie.
C’est une protection durable, l’efficacité de la plupart des produits utilisés dans la protection passive n’étant pas limitée dans le temps.
Les principaux moyens de la protection passive sont : Pour les structures, le flocage, l’encoffrement, les peintures ou enduits intumescents… Pour le compartimentage, les parois, les portes coupe-feu, les calfeutrements coupe-feu de pénétration de câbles et de tuyaux, les cheminements techniques protégés...
Résistance à la flamme
Revêtements en phase aqueuse
ThermographieIndex. décimale : 667.9 Revêtements et enduits Résumé : In civil construction, intumescent coatings are widely used in steel structures, because in a fire, this material loses approximately half of its elastic modulus at 500°C. The use of these paints is essential to ensure the structural safety of the construction as well as that of humans. The phenomenon of intumescence in paints occurs when they are subjected to high temperatures forming a carbonaceous layer that expands on the surface of the coating, with the main purpose of serving as a thermal insulator of the substrate. The development of paints with low impact on the environment has been stimulated due to restrictions on the emission of volatile organic compounds imposed by government agencies. Therefore, the development of water-based intumescent paints has become essential to meet these guidelines. In the present work, intumescent coatings were developed with different water-based resins: epoxy, acrylic and alkyd. The paints were formulated using expandable graphite as a blowing agent and expanded char source, ammonium polyphosphate as an acid source and lignin as a carbon source. The formulations were applied to steel substrates and exposed to burning tests to verify fire resistance, and in addition, the samples were characterized by combustion microcalorimetry, thermogravimetric analysis and pyrolysis coupled with gas chromatography and mass spectrometry. The carbonaceous layers were characterized by optical microscopy, scanning electron microscopy with dispersive energy spectroscopy, X-ray diffraction and Raman spectroscopy. The results of combustion microcalorimetry showed that the formulations containing lignin released less heat than the others. No toxic gases were detected in the pyrolysis of epoxy and acrylic system paints. The X-ray diffraction and Raman analyses proved the formation of thermally stable compounds in the carbonaceous layer. Note de contenu : - EXPERIMENTAL : Preparation of paints - Preparation of samples - Characterization of coatings - Characterization of the carbonaceous layer
- RESULTS AND DISCUSSION : Characterization of coatings - Characterization of the carbonaceous layer
- Table 1 : Formulation of intumescent paints in % (w/w)
- Table 2 : Data obtained from TG/DTG thermograms
- Table 3 : Data obtained from the MCC graphs
- Table 4 : Chemical elements of the elementary EDS analysis of the samplesDOI : https://doi.org/10.1007/s11998-022-00597-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00597-4.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38837
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 1 (01/2023)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23928 - Périodique Bibliothèque principale Documentaires Disponible Performance of phosphate–alumina pigments in waterborne paints for protection of cold-rolled steel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)
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Titre : Performance of phosphate–alumina pigments in waterborne paints for protection of cold-rolled steel Type de document : texte imprimé Année de publication : 2011 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine
Anticorrosifs
Core-Shell
Phosphates
Pigments inorganiques
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Core–shell theory presents a new easy method to obtain high performance, economic, and eco-friendly anticorrosive mixed pigments. The core–shell pigments in this work are prepared by depositing a surface layer of an expensive efficient anticorrosive pigment (phosphates) on a bulk of less expensive extender pigment (alumina). The combination of these two compounds led to the production of new pigments with improved properties different from each of its individual components; and consequently these improved properties led to changing the efficiency of protection properties of paint films containing these new pigments. The new pigments were characterized using XRD, SEM, TEM, and EDAX analysis to elucidate their structure and prove the presence of phosphate ions on the surface of alumina. These pigments were also evaluated according to ASTM measurements. Then they were incorporated in three groups of emulsion paint formulations based on styrene acrylic emulsion copolymer, and comprising different concentrations of Zn, Mg, and 1Zn·1Mg phosphates/alumina core–shell pigments; in addition to a control formulation free of these pigments, to evaluate their efficiencies in anticorrosive paints for protection of cold-rolled steel. Chemical, physical, and mechanical measurements were carried out, besides corrosion resistance tests and weight loss of steel panels under paint films which were determined in 5% NaCl solution for 28 days. The results proved that the prepared formulations containing the prepared pigments could protect steel efficiently from corrosion compared to the control specimen. Groups II and III containing higher weight percentages of prepared pigments showed the best performance in corrosion protection, and the best performance among these two groups was paint films containing magnesium phosphate/alumina pigments. Note de contenu : - EXPERIMENTAL : Materials - Mmethods of instrumental analysis (SEM/EDAX analysis, transmission electron microscopy) - Preparation of pigments (Preparation of new core-shell pigments) - Preparation of waterborne paint formulations - Evaluation of the prepared waterborne paints ( Physico-mechanical and chemical evaluation of the prepared waterborne paints.
- RESULTS AND DISCUSSION : Pigment characterization - Evaluation of prepared core-shell pigments - Waterborne paint formulations - Evaluation of the prepared waterborne paint formulations (Corrosion inhibition properties of the prepared waterborne - Weight loss determination of steel panels under waterborne paint films - Corrosion inhibition efficiency of paint formulations in presence of core-shell pigments).DOI : 10.1007/s11998-010-9288-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9288-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11363
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 2 (03/2011)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012999 - Périodique Bibliothèque principale Documentaires Disponible Pickering aqueous foam templating : a promising strategy to fabricate porous waterborne polyurethane coatings / Jianhui Wu in COLLAGEN AND LEATHER, Vol. 5 (2023)
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[article]
Titre : Pickering aqueous foam templating : a promising strategy to fabricate porous waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Jianhui Wu, Auteur ; Jiajing Zhou, Auteur ; Zhenghao Shi, Auteur ; Chunhua Wang, Auteur ; To Ngai, Auteur ; Wei Lin, Auteur Année de publication : 2023 Article en page(s) : 4 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emulsions pickering
Matériaux poreux
Mousses plastiques
Polymères en émulsion
Polyuréthanes
Revêtements en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Waterborne polyurethane (WPU) has been widely used as coatings in industrial fields ranging from wood, real/synthetic leather, and textiles, because it exhibits versatile performance, excellent eco-friendliness, and superior film-forming property. In terms of wearable products, compact WPU coatings often cause discomfort due to the intrinsic poor vapor transmission. Moreover, the resultant relatively high humidity promotes the growth of skin flora, resulting in unpleasant odors, and even skin infectious diseases. To this end, breathable porous WPU coatings with tunable pore size has emerged as a favorable alternative to modulate the “climate” of microenvironment at the interface between skins and wearable products. Several strategies have been now developed to engineer porous WPU coatings. In this perspective, we describe various strategies that have been developed to manufacture porous WPU coatings. According to whether the template is used and the category of templates used, we categorize these strategies into three different types, including hard templating, soft templating, and template-free methods. We discuss the advantages and disadvantages of each strategy and highlight the importance in developing new strategies of making highly breathable WPU to help the sustainable growth of the leather industry. Note de contenu : - Hard templating
- Soft templating
- Template-free method
- Pickering aqueous foam templatingDOI : https://doi.org/10.1186/s42825-023-00115-9 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00115-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40064
in COLLAGEN AND LEATHER > Vol. 5 (2023) . - 4 p.[article]Pigment combinations for water based paints / Mukund Hulyalkar in PAINTINDIA, Vol. LXXII, N° 12 (12/2022)
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[article]
Titre : Pigment combinations for water based paints : Dissection of formulation Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2022 Article en page(s) : p. 98-102 Langues : Anglais (eng) Catégories : Pigments
Revêtements -- Coloration:Peinture -- Coloration
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : In the previous issues we had focused mainly on the formulation of WB base paints. In th is final article we have discussed on the preparation of various shades for all types of paints. Hints for paint shade matching is also given. In shade matching, it is most important to know what not to add, than what to add as this is crucial in the success of obtaining the correct shade. Note de contenu : - Table 1 : Distemper shade combinations for 100 kgs
- Table 2 : Acrylic washable distemper
- Table 3 : Acrylic waterbase distemper (Bucket quality) tinters in decreasing
- Table 4 : Pouch distemper 1st quality
- Table 5 : Pouch distemper 2nd quality (for 180 kgs)
- Table 6 : Matching recipes for popular shades in exterior emulsion paint - Pastel shades (base paint with TiO2)
- Table 7 : Recipes for pastel shades (base paints with TiO2)
- Table 8 : Recipes for deep shades without TiO2En ligne : https://drive.google.com/file/d/1xj9l4JLU7F1o1Td9oRdAuW_9JGlk9QLk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39328
in PAINTINDIA > Vol. LXXII, N° 12 (12/2022) . - p. 98-102[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24013 - Périodique Bibliothèque principale Documentaires Disponible Pigment dispersion : principles you should know / M. Veeramani in PAINTINDIA, Vol. LXXIII, N° 6 (06/2023)
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PermalinkPermalinkPermalinkPermalinkLa "PIT-slope", une méthode simple et rapide pour classer les tensioactifs selon leur véritable "HLB" / Jesùs F. Ontiveros in L'ACTUALITE CHIMIQUE, N° 472 (04/2022)
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PermalinkPolyacrylamide-grafted dextrine copolymer coatings / T. Sugama in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 887 (12/1998)
PermalinkPolymer blend systems for waterborne coatings / Jitendra U. Agare in PAINTINDIA, Vol. LVII, N° 11 (11/2007)
PermalinkPolymer mixing enhances performance / Zhenwen Fu in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/2009 (06/2009)
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PermalinkPermalinkPolymeric surfactants in polymerisation and coatings / A. Bouvy in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/96 (11/1996)
PermalinkPolymers for water-based coatings - a systematic overview / J. C. Padget in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 839 (12/1994)
PermalinkPolymethylsilsesquioxane powder prepared by morphology-controlled growth and its composite with waterborne latex for superhydrophobic coating fabrication / Baiyu Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)
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PermalinkPermalinkPolyurethane urea dispersions with better balance of properties / Monica Fuensanta in EUROPEAN COATINGS JOURNAL (ECJ), N° 2 (02/2019)
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