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Effect of nanosilica and Zno nanoparticles / Anabel Crespo Soler in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4608 (05/2015)
[article]
Titre : Effect of nanosilica and Zno nanoparticles Type de document : texte imprimé Auteurs : Anabel Crespo Soler, Auteur ; N. Lardies Miaza, Auteur Année de publication : 2015 Article en page(s) : p. 14-16 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux)
Formulation (Génie chimique)
Nanoparticules
Oxyde de zinc
Polyuréthanes
Résistance à l'abrasion
Résistance au rayonnement ultraviolet
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements en phase aqueuse:Peinture en phase aqueuse
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, commercial nano zinc oxide (nano-ZnO) and nanosilica (nano-SiO2) were employed as fillers to improve the properties of abrasion and UV resistance of waterborne polyurethane coatings. Various dispersion techniques were studied to prevent the aggregation of primary nanoparticles in the polyol mixture. The nanoparticles dispersion was studied by OM and SEM. Polyols containing nanoparticles were mixed with the suitable amount of isocyanate to obtain polyurethane water-based coatings.
The resultant polyurethane nanocomposite was characterised according to abrasion resistance (ASTM D 4060) and QUV resistance (ASTM D 4587). Abrasion resistance was improved by adding different percentages of nanosilica nanoparticles but no improvement was obtained regarding UV resistance. Nano-zinc oxide nanoparticles contribution enhanced neither abrasion nor UV resistance, maybe due to catalytic reaction of nano-ZnO over PUR mains.Note de contenu : - EXPERIMENTAL : Materials - Mixing systems
- CHARACTERISATION TECHNIQUES : Optical microscope - Scanning electron microscope (SEM) - Abrasion resistance - QUV ageing and colour measurement - Experimental - Preparation of nanocomposites PUR coatings
- RESULTS AND DISCUSSIONS : Dispersion methods - Scanning electron microscope (SEM) - Abrasion resistance - QUV and colour measurementEn ligne : https://drive.google.com/file/d/1VOD-7gC_gX5VxH1oHG2iE2Q1AvhK2Sey/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24041
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 205, N° 4608 (05/2015) . - p. 14-16[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17211 - Périodique Bibliothèque principale Documentaires Disponible Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt / Chao Lv in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
[article]
Titre : Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt Type de document : texte imprimé Auteurs : Chao Lv, Auteur ; Ruiqing Shen, Auteur ; Yang Yang, Auteur ; Rui Shu, Auteur ; Guodong Li, Auteur ; Jingxian Liu, Auteur Année de publication : 2023 Article en page(s) : p. 1423-1433 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Feutre (textiles et tissus)
Filtration
Matériaux -- Imprégnation
Matériaux aiguilletés
Polytétrafluoréthylène
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Polytetrafluoroethylene (PTFE) emulsion is widely used as a coating material in the impregnation process for preparing polyphenylene sulfide (PPS) needle felts due to its excellent chemical stability and good mechanical properties. However, the effect of emulsion impregnation coating on the filtration performance of needle felts is still under debate. Moreover, in industrial applications with high temperatures, the service life of needle felts is directly affected by their thermal stability, but the pyrolysis and kinetic properties of PPS needle felt after PTFE emulsion impregnation post-processing have rarely been quantitatively investigated. In this study, the PPS fiber/PTFE emulsion (PPS/PTFE) composite needle felt was fabricated by a direct impregnation process. The pressure drop characteristic and mechanical collection efficiency of PPS needle felt and PPS/PTFE composite needle felt were comprehensively evaluated. It was found that the PTFE emulsion impregnation coating not only increases the pressure drop, but also decreases the collection efficiency. More specifically, for particles having a size below 2.5 μm, the decrement of collection efficiency further increases with the decrease of particle size, but the mechanical collection efficiency of PPS/PTFE composite needle felt for particles having larger size is almost the same as that of PPS needle felt. Three emulsion impregnation coating distribution models were inferred to systematically explain this experimental phenomenon. Additionally, the thermal degradation process of PPS needle felt and PPS/PTFE composite needle felt was analyzed, and several typical pyrolysis kinetic parameters were also determined theoretically. It was confirmed that the PTFE emulsion impregnation coatings can enhance the thermal stability of PPS needle felts. This work provides new insight into the rational application of the direct impregnation process as well as emulsion impregnation coating in the industrial filtration field. Note de contenu : - MATERIALS AND METHODS :
- Materials
- Preparation of PPS/PTFE composite needle felt
- Characterizations
- RESULTS AND DISCUSSION :
- Pressure drop characteristics and mechanical collection efficiency
- Thermal degradation process and reaction kinetics
- Table 1 : Information of experimental materialsDOI : https://doi.org/10.1007/s11998-022-00755-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00755-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39726
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 4 (07/2023) . - p. 1423-1433[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24153 - Périodique Bibliothèque principale Documentaires Disponible Effect of titania, barite, and kaolinite fillers on char layer formation in water-based intumescent fire-retardant coatings / Iben Hansen-Bruhn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)
[article]
Titre : Effect of titania, barite, and kaolinite fillers on char layer formation in water-based intumescent fire-retardant coatings Type de document : texte imprimé Auteurs : Iben Hansen-Bruhn, Auteur ; Anne Vetter Poulsen, Auteur ; Ulrik Abildgaard, Auteur ; Jens Bomholdt Ravnsbæk, Auteur ; Mogens Hinge, Auteur Année de publication : 2022 Article en page(s) : p. 1067-1075 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Barytine La barytine (ou baryte, voir les synonymes) est une espèce minérale composée de sulfate de baryum de formule BaSO4 avec des traces de Sr, Ca et Pb. Ce minéral, d'origine hydrothermale, présente de nombreuses variétés. Sa densité et le baryum qu'il contient sont les causes principales de ses utilisations industrielles et plusieurs millions de tonnes de barytine sont extraits et produits chaque année. (Wikipedia)
Char (matériaux pyrolysé)
Charges (matériaux)
Dioxyde de titane
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Kaolinite
Revêtements en phase aqueuse
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Intumescent fire-retardant coatings are widely applied as they combine designable aesthetics and fire protection without compromising substrate properties. When exposed to heat, intumescent fire-retardant coatings expand and build an insulating char. This study presents an investigation of the char by addition of kaolinite, barite, and titania as functional fillers in intumescent coatings. Expansion experiments at 400°C with custom build image analysis showed that kaolinite inhibited (0.03 mm/s, expansion factor ≈ 7), whereas barite acted synergistically on the expansion ability (0.59 mm/s, expansion factor ≈ 85). The resulting char density and the visual inspection showed that barite char was less compact, with cracks and voids. Evaluation of fire performance by single burning item tests resulted in Euroclass C for the barite system and Euroclass A2/B for the titania system. Post-heating chars demonstrated poor thermostability of barite char, and subsequent FTIR spectroscopy revealed that titania char formed the thermostable titanium pyrophosphate. Further inspection of the titania char revealed a uniform closed cell structure with mean bubble sizes of 26–56 µm. Titania coating expands rapidly (0.37 mm/s, expansion factor ≈ 60) and forms a structurally stable tumescent char with a compact and uniform porous structure exhibiting resistance to char oxidation at sustained heating. Note de contenu : - Coating preparation
- Sample preparation and coating thickness
- Fourier transform infrared spectroscopy
- Char expansion rate
- Image analysis
- Char density
- High temperature char degradation
- Fire performance
- Scanning electron microscopy
- Table 1: Intumescence characteristics. Extracted parameters from image analysis and measured char density. α: Expansion rate, β: Expansion factor, ρ: Density, H: Char height, and t: Time
- Table 2 : SBI results of titania, barite, and FR coatings. FIGRA: Fire growth index at 0.2 MJ and 0.4 MJ, respectively. THR: Total heat release after 600 s test time. SMOGRA: Smoke growth index. TSP: Total smoke production after 600 s test timeDOI : https://doi.org/10.1007/s11998-021-00585-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00585-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38036
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1067-1075[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23574 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Effects in aqueous paints : Tools for manipulating viscosity and mobility in a system Type de document : texte imprimé Auteurs : Dariusz Bebej, Auteur ; Jesus Pitarch Lopez, Auteur ; Jörg Rüger, Auteur Année de publication : 2023 Article en page(s) : p. 30-34 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés amphiphiles
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs
Revêtements en phase aqueuse:Peinture en phase aqueuse
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : Additives have an influence on the drying process of water-based paints by affecting the Brownian motion of particles.
The additive-dependent viscosity changes help to manipulate effects such as run-off or flow during drying of water-based paints. In addition, a linear correlation between the open time (according to ASTM D7488) and the 2nd decrease in Brownian motion was found. Possibly, with the help of the correlation, the classical ASTM D7488 method can be replaced by ASII measurements (ASII: Adaptive Speckle Imaging Interferometry).Note de contenu : - Effective methods for measuring the influence of additives
- Chemical characteristics of the additives
- Observations for up to the 1st decay of brownian motion
- Findings for up to the 2nd decayof brownian motion
- Fig. 1 : Representation of simplified structural formulas of the used additivesEn ligne : https://drive.google.com/file/d/1TBJkFJWOGCZv9CpqvVb6jjsfYsYgNTb9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40085
in EUROPEAN COATINGS JOURNAL (ECJ) > (11/2023) . - p. 30-34[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24302 - Périodique Bibliothèque principale Documentaires Disponible Effects of latex and thickener polarities on rheology and phase stability of latex-HEUR mixtures / Travis B. Smith in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
[article]
Titre : Effects of latex and thickener polarities on rheology and phase stability of latex-HEUR mixtures Type de document : texte imprimé Auteurs : Travis B. Smith, Auteur ; David Chisholm, Auteur ; Abby Cheng, Auteur ; Juan Ortiz Salazar, Auteur ; Lia Roccucci, Auteur ; Bailey Morales, Auteur ; Gary Dombrowski, Auteur ; John J. Rabasco, Auteur ; Patrick Hartnett, Auteur ; Ray Fernando, Auteur Année de publication : 2023 Article en page(s) : p. 1311-1324 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique)
Epaississants
Epaississement
Floculation
Latex
Polyuréthane éthoxylé modifié de façon hydrophobe
Revêtements en phase aqueuse:Peinture en phase aqueuse
Rhéologie
SynérèseEn chimie, la synérèse définit la séparation d'un liquide de son gel.Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, hydrophobically modified, ethoxylate urethanes (HEURs) and latexes of well-defined structure and composition were used to examine the rheology and phase behavior of HEUR–latex mixtures. The mixtures comprised one of four HEURs that were synthesized with varying molecular weight polyethylene glycols (PEG 35 K, 20 K, 12 K, and 8 K) and end-capped with octadecyl hydrophobes, as well as one of two latexes (butyl acrylate/styrene [BA-Sty] and butyl acrylate/methyl methacrylate [BA-MMA]) that each contained a small amount of methacrylic acid. The two experimental latexes represent compositions commonly used in commercial paint formulations. The polarity of the HEURs decreases as the PEG molecular weight decreases and the surface of the styrene containing latex is less polar than that containing methyl methacrylate. In all HEUR–latex mixtures, the latex polymer volume fraction was maintained constant at 0.25 which provides a dispersed component spatial crowdedness that represents a fully formulated paint. All latex–HEUR mixtures were stable at very low (i.e., below 0.10% by weight) HEUR levels. At critical concentrations dependent on the polarity of thickener and latex, flocculation was accompanied by syneresis for latex-thickener mixtures prepared with all HEURs except the one with the longest PEG spacer. Further increase of HEUR levels revealed another critical concentration above which the mixtures were stable. Effects of the latex polarity diminished for the mixtures prepared with more hydrophobic HEURs. Note de contenu : - HEUR C18-EO795 and latex mixtures
- HEUR C18-EO455 and latex mixtures
- Table 1 : Compositions and molecular weights (determined by GPC) of model HEURs
- Table 2 : Properties of model latexes
- Table 3 : Compositions of representative latex–HEUR mixtures
- Table 4 : Visual assessment of stability of latex–HEUR samples after 6–8 days of equilibration
- Table 5 : Number of HEUR molecules available per BA-Sty latex particle
- Table 6 : Latex surface area (nm2) claimed by a HEUR hydrophobe, assuming one of the hydrophobes from every HEUR molecule is adsorbeDOI : https://doi.org/10.1007/s11998-022-00746-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00746-3.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39718
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