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Synthesis of vanillin-based UV curable polyurethane dispersions for wood coating applications / Darshan Mahajan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
[article]
Titre : Synthesis of vanillin-based UV curable polyurethane dispersions for wood coating applications Type de document : texte imprimé Auteurs : Darshan Mahajan, Auteur ; Darbha Sai Srivats, Auteur ; Aarti More, Auteur Année de publication : 2023 Article en page(s) : p. 1773-1788 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biopolymères
Biopolymères -- Synthèse
Bois -- Revêtements
Caractérisation
Chimie analytique
Composés organiques -- Synthèse
Dispersions et suspensions
Enrobage (technologie)
Formulation (Génie chimique)
Polymères en émulsion
Polyuréthanes
Résistance aux taches
Résistance chimique
Revêtements -- Propriétés mécaniques
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Partial incorporation of bio-based diol in the synthesis of UV-curable polyurethane dispersion (PUDs) has been studied. The bio-based diol was synthesized from vanillin. Divanillin (DV) was used as a partial replacement for polyethylene glycol an industrial diol. PUDs were synthesized by reacting vanillin and polyethylene glycol in different percentages (10:90, 30:70, and 50:50) with isophorone diisocyanate along with 2-dimethyl propionic acid. Hydroxyethyl methacrylate is attached to incorporate unsaturation, which helps in the UV curing process, and triethyl amine is used for acid group neutralization. The synthesis of DV and resin was confirmed by FTIR spectroscopy. Divanillin synthesis confirmation was carried out by NMR spectroscopy. The synthesized resin was dispersed in water and applied on a wooden panel. Mechanical testing, like scratch resistance, pencil hardness, and cross-hatch adhesion tests, was carried out on the cured coatings to determine their properties. The 30% incorporation of DV shows the highest pencil hardness (2H) and scratch hardness (0.90 kg) among all the DV formulations and the results were comparable to plain formulation. The 30% DV also exhibits good gloss at 60° angle with value of 76.7. Coatings exhibited excellent acid resistance and moderate resistance towards alkalis. TGA was performed on the plain PU and 30% DV and the onset temperatures were 190 °C and 185 °C, respectively. All the dispersions formed were tested to determine their particle size, and the particle size distributions were in the range of 3–55 µm. Gel content percentages for all the samples were in the range of 90–97%. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of divanillin - Synthesis of polyurethane resin - Preparation of polyurethane dispersion and preparation of coating - Characterization
- RESULTS AND DISCUSSION : FTIR - NMR analysis - Contact angle - Mechanical properties - Chemical prperties - Thermogravimetric analysis (TGA) - Particle size analysis of polyurethane dispersion - Gel content
- Table 1 : Formulations of synthesized resin with different ratios of divanillin (DV) to PEG
- Table 2 : Results of mechanical properties
- Table 3 : Chemical resistance of the coating
- Table 4 : Stain resistance of coating
- Table 5 : Polyurethane dispersion particle diameter values after synthesis (D10, D50, and D90)
- Table 6 : Polyurethane dispersion particle diameter values after 6 months (D10, D50, and D90)DOI : https://doi.org/10.1007/s11998-023-00780-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00780-9.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39987
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Code-barres Cote Support Localisation Section Disponibilité 24242 - Périodique Bibliothèque principale Documentaires Disponible Systèmes de canalisations plastiques. Tubes et raccords plastiques thermodurcissables renforcés de verre et raccords (PRV). Détermination de la résistance à une attaque chimique par l'intérieur d'un tronçon de tube soumis à déflexion - Norme NF EN 1120 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (1996)
Titre de série : Systèmes de canalisations plastiques Titre : Tubes et raccords plastiques thermodurcissables renforcés de verre et raccords (PRV). Détermination de la résistance à une attaque chimique par l'intérieur d'un tronçon de tube soumis à déflexion - Norme NF EN 1120 Type de document : texte imprimé Auteurs : Association Française de Normalisation (Paris) , Auteur Editeur : Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) Année de publication : 1996 Importance : 10 p. Présentation : ill. Format : 30 cm Catégories : Composites à fibres de verre -- Normes
DéflexionUne déflexion est une modification progressive de position ou d'une trajectoire sous l'effet d'un phénomène physique. Le concept intervient dans plusieurs domaines de la physique.
Essais (technologie) -- Normes
Matières plastiques -- Normes
Renforts textiles
Résistance chimique
Thermodurcissables
TuyauterieIndex. décimale : 668.4 Plastiques, vinyles Résumé : Le présent document spécifie une méthode pour la détermination des propriétés de résistance chimique par l'intérieur d'une section de tube en plastique soumise à ovalisation. Indice de classement : T 57-216 Classification ICS : 23.040.20 ; 23.040.45 ; 83.120 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19085 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15449 T 57-216 Norme Bibliothèque principale Documentaires Disponible The curse of the mummy / Mike O'Donoghue in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 2 (02/2016)
[article]
Titre : The curse of the mummy : Mysterious tank lining failures in wac vessels Type de document : texte imprimé Auteurs : Mike O'Donoghue, Auteur ; Vijay Datta, Auteur ; Sean Adlem, Auteur ; Jack Whittaker, Auteur ; Doug Wade, Auteur ; Margaret Pardy, Auteur Année de publication : 2016 Article en page(s) : p. 30-41 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Anticorrosion
Epoxydes
Réservoirs (récipients) -- revêtements protecteurs
Résistance chimique
Revêtements -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : Epoxy lining failures in WAC vessels - This article outlines discoveries made from forensic work to unravel epoxy lining failures in several water treatment weak acid cation (WAC) vessels. In previous work by authors Mike O'Donoghue and Vijay Datte, a forensic investigation of several costly tank lining failures was presented as analogous to an archeological dig wherein anticipation and wonder mounted as the investigation unearthed and unwrapped a "chemical mummy.
Would the present study prove to be similar ? Or would a different type of mummy be discovered in another, and altogether différent, series of tank lining failures. The answer was soon to be discovered in the Canadien ail patch where attention was focused on boiter feed water.
In the treatment of steam assisted gravity drainage (SAGD) boiler feed water, WAC and strong acid cation (SAC) ion-exchange vessels play an important role in the treatment of process fluids and demineralization of water to generate steam. The service conditions in WAC vessels are more aggressive than those in SAC vessels, with typical SAGD operating temperatures in excess of 93 C (200 F), operating pressures of 40-to-60 psi and a weekly regeneration protocol that consists of approximately 1.5 hours of acid treatment (6-percent hydrochloric acid, HCI) followed by 1.5 hours of caustic treatment (5-percent sodium hydroxide, NaOH). The ion-exchange resin bels in the WAC vessels are not considered overly aggressive when compared to the aggressive regeneration conditions. WAC resins have a carboxylic acid (COOH) functional group and are produced by copolymerizing acrylic acid with divinyl-benzene as a crosslinking agent2.3.
Due to the severity of the conditions in WAC and SAC vessels, high-performance linings must be carefully selected and carefully applied. The expectations are that the linings in WAC vessels should afford corrosion protection for at least 10 years.Note de contenu : - WAC AND SAC FLOW PROCESS
- RUBBER LINING FAILURES AND LABORATORY TEST PROGRAM
- SOLVENT-FREE EPOXY (SFE 1) : BEST IN TEST
- APPLICATION OF SFE 1 IN WAC VESSELS : Surface preparation - Application - Dry-film thikcness (DFT)
- THE MYSTERIOUS LINING FAILURE OF SFE 1
- FAILURE ANALYSIS : Observationin the WAC vessels
- DETERMINATION OF BASE-TO-CONVERVER MIX RATIO OF SFE 1 : ATR-FTIR of SPE 1 coating chip and control
- DISCUSSION : Epoxy chemistry of SFE 1 - Application considerations and field observations
- FIGURES : 1. A WAC vessel in service in the Canadian oil patch - 2. Prequalification testing of SFE 1 - 3. Surface blisters on SFE 1 in prequalification testing - SFE 1 in WAC vessels after two years of service
- TABLES : 1. Prequalification immersion testing at 90C of solvent free epoxy, SFE 1 in 10% HCL 10% nadh and process fluids - 2. Prequalification adhesion testing of solvent free-epoxy, SFE 1 - 3. WAC vessel A - Application of SFE 1 - 4. WAC vessel a lined with SFE 1 after 2 years service
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25632
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Code-barres Cote Support Localisation Section Disponibilité 17889 - Périodique Bibliothèque principale Documentaires Disponible The effect of caustic soda solutions on fusion-bonded epoxy coatings at high temperatures / Hassan Al-Sagour in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 9 (09-10/2018)
[article]
Titre : The effect of caustic soda solutions on fusion-bonded epoxy coatings at high temperatures Type de document : texte imprimé Auteurs : Hassan Al-Sagour, Auteur ; Mana Al-Mansour, Auteur Année de publication : 2018 Article en page(s) : p. 36-43 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Analyse spectrale
Analyse thermique
Calorimétrie
Décoloration
Diffractométrie de rayons X
Epaisseur -- Mesure
Essais (technologie)
Hydroxyde de sodiumL'hydroxyde de sodium, appelé également soude caustique7, est un corps chimique composé minéral de formule chimique NaOH, qui est à température ambiante un solide ionique. Fusible vers 318 °C, il se présente généralement sous forme de pastilles, de paillettes ou de billes blanches ou d'aspect translucide, corrosives et très hygroscopiques. Il est très soluble dans l'eau et légèrement soluble dans l'éthanol.
La solution d'hydroxyde de sodium, souvent appelée soude, est une solution aqueuse transparente. Concentrée, elle est corrosive et souvent appelée lessive de soude.
Les propriétés chimiques de l'hydroxyde de sodium sont surtout liées à l'ion hydroxyde HO- qui est une base forte. En outre, l'hydroxyde de sodium réagit avec le dioxyde de carbone (CO2) de l'air et se carbonate.
La solubilité de la soude caustique dans l'eau augmente avec la température, à pression constante ou ambiante.
Résistance chimique
Revêtement époxy lié par fusion
Revêtements -- AnalyseIndex. décimale : 667.9 Revêtements et enduits Résumé : In the article, "Qualification test for high-temperature FBE coatings" in the July 2018 issue of JPCL, the results of qualification testing of high-temperature fusion-bonded epoxy (FBE) coatings were reported by the authors. This testing involved immersion in different solutions at a high temperature to examine the chemical resistance of various FBE coatings. Three candidate products were immersed at a high temperature and all showed satisfactory performance in distilled water, synthetic sea water and a 5-precent NaCl solution. Most products, however experienced serve discoloration when immersed in a 5-precent NaOH (causic soda) solution.
In this article the authors describe further testing conducted on one of the candidate products to determine the significance of this discoloration. While it is common in the coating industry to condiser discolorationa failure, discoloration has sometimes been claimed a result of the reaction between coloring pigments and test solutions indicating no impact on a coating's properties. Hence, this work has been carried out to more closely examine the source of color change and address the changes in coating properties in more detail.Note de contenu : - The background
- Microscopic examination
- Dry-film thickness
- Pull-off adhesion
- Electrochemical impedance spectroscopy
- X-ray diffraction
- Energy dispersive X-ray spectroscopy
- Differential scanning calorimetry
- Attenuated total reflectance fourier spectroscopy
- Fig. 1 : Cross-section examinqtion qt 80-times magnification. Figures counrtnesy of the author.
- Fig. 2 : Color, DFH and adhesion on Sample 1.
- Fig. 3 : Color, DFH and adhesion on Sample 2.
- Fig. 4 : Color, DFH and adhesion on Sample 3.
- Fig. 5 : DSC scans from panels after immersion in different solutions.
- Fig. 6 : DSC scan of the coating after dry heat.
- Table 1 : DFT, Adhesion and EIS before and after immersion in NaOH solution.
- Table 2 : Composition of the top layer.
- Table 3 : Composition of the intermediate layer.
- Table 4 : Elemental composition comparison (EDX vs. XRD)Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31897
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Code-barres Cote Support Localisation Section Disponibilité 20250 - Périodique Bibliothèque principale Documentaires Disponible The green approach to more sustainable binders for wood coatings / Esra Bay in SURFACE COATINGS INTERNATIONAL, Vol. 100.6 (12/2017 - 01/2018)
[article]
Titre : The green approach to more sustainable binders for wood coatings Type de document : texte imprimé Auteurs : Esra Bay, Auteur ; Peter Müller, Auteur ; Simon Austin, Auteur Année de publication : 2017 Article en page(s) : p. 312-316 Langues : Anglais (eng) Catégories : Bois -- Revêtements
Brillance (optique)
Essai Wolff-Wilborn
Formulation (Génie chimique)
Liants
Méthacrylate d’isobornyle
Opacité (optique)
Polyacryliques
Résistance chimique
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : Recent health and environmental concerns within the European coating industry have forced formulators and manufacturers to shift from solventborne to waterborne systems over the last decade. Now, one of the newer challenges for the coatings industry is the demand for more sustainable, eco-friendly, energy efficient and greener technology. Note de contenu : - PROTOTYPE SELECTION AND DEVELOPMENT
- EVALUATION OF APPLICATION PROPERTIES : Pendulum hardness development – Pencil hardness – Gloss performance at 60°C – Chemical resistance
- TABLES : 1. Comparison of basic properties of the reference (prototype 1) and modified renewable prototypes – 2. Monomer properties substituted into prototype A – 3. Comparison of measured MFFT values and water uptake properties of prototype and competitor acrylic – 4. Clearcoat formulation composition – 5. Opaque white formulation composition – 6. Pencil hardness performance comparison of prototypes and reference acrylic
- FIGURES : 1. Molecular structure of 2-OA monomer – 2. Molecular structure of IBOMA (isobornyl methacrylate) monomer – 3. Coalescent demand curves of prototypes and competitor acrylic – 4. Hardness development comparison of prototypes and competitor acrylic – 5. Hardness development comparison of reference acrylic and renewable prototypes in clear coat formulation – 6. Hardness development of reference acrylic and renewable prototypes in opaque white formulation – 7. Comparison of gloss performance of prototypes in clear coat and opaque white formulations (gloss levels at 60°) – 8. Chemical resistance performance in the clear coat formulation – 9. Chemical resistance performance in the opaque white formulationEn ligne : https://drive.google.com/file/d/1cVaQ3tdY-E9fain6dairSh3d0tLrHCLN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30003
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