Avoiding filter effects of flame retardants / Christian Battenberg in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 1 (2021)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 1 (2021) . - p. 46-49 Titre : Avoiding filter effects of flame retardants : Completely halogen-free flame retardancy of epoxy-fiber composite components Type de document : texte imprimé Auteurs : Christian Battenberg, Auteur ; Frank Osterod, Auteur ; Adrian Beard, Auteur Année de publication : 2021 Article en page(s) : p. 46-49 Langues : Anglais (eng) Catégories : Epoxydes Éther de diglycidyle et de bisphénol A Halogènes -- Suppression ou remplacement Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Matières plastiques -- Additifs Réticulants Thermodurcissables Index. décimale : 668.4 Plastiques, vinyles Résumé : To meet stringent flame retardancy demands of areas such as transportation and electronics, components based on thermosets increasingly require a soluble, non-powder flame retardant (FR) due to low layer thickness in the final product or due to liquid processing methods. Two flame-retardants developed by Clariant meet these requirements. Note de contenu : - Halogen-free flame retardants for fiber composites - Powdered flame retardants are unsuitable - Alternatives for DOPO and phosphazene - Lower viscosity than with other flame retardants - V-O rating can be easily achieved - Fig. 1 : Basic properties of the Exolit flame retardants compared with a DOPO- and a phosphazene-based reference in each case : the FR achieve similar or even better values than the references for all properties - Fig. 2 : The cured epoxy resin with 40 phr ATH shows strong opacity due to the added FR particles. The cured epoxy resin with 100 phr Exolit EP 360, on the other hand, shows no opacity - Table 1 : Comparison of different blends of an epoxy resin made from DGEBA with different FR additions - Table 2 : Comparison of different systems of epoxy resin, hardener and Exolit FR Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35107 [article]

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Insights into the corrosion mitigation efficacy of modified SiO2/GO-based epoxy composite coatings for aluminum alloy AA6061 in marine applications / Arshad Ali Khan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1447-1466 Titre : Insights into the corrosion mitigation efficacy of modified SiO2/GO-based epoxy composite coatings for aluminum alloy AA6061 in marine applications Type de document : texte imprimé Auteurs : Arshad Ali Khan, Auteur ; Afzal Khan, Auteur ; Zainab Zafar, Auteur ; Ishaq Ahmad, Auteur Année de publication : 2024 Article en page(s) : p. 1447-1466 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Caractérisation Dioxyde de silicium Epoxydes Éther de diglycidyle et de bisphénol A Marines (peinture) Matériaux hybrides Métaux -- Revêtements protecteurs Oxyde de graphène Revêtements -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : The corrosion protection of aluminum alloys is severely compromised by marine environments, demanding the formulation of efficient protective coatings. Epoxy resin, diglycidyl ether of bisphenol A (DGEBA), and curing agent diethylenetriamine (DETA) were used with the mixing ratio of 100:12 to synthesize functionalized SiO2/GO-based composite coatings and investigate the corrosion protection efficacy for aluminum alloy AA6061 in marine environments. To boost the coatings' barrier and anticorrosive attributes, functionalized silica (FSiO2, with 0, 3, 6, 9, 12, and 15 wt%) and graphene oxide (GO) were jointly incorporated into the DGEBA/DETA epoxy-hardener system for producing composite coatings. The functionalization of silica particles using 3-aminopropyl-triethoxysilane and synthesis of GO was successfully carried out, according to the Fourier transform infrared spectroscopy evidence. The structural properties were investigated by X-ray diffraction. The hydrophobicity tests were conducted for the measurement of the contact angles. The highest static contact angle (126° ± 2) and the lowest contact angle (74° ± 1.5) were recorded for the sample EHS9GO2 and AA6061, respectively, which showed that EHS9GO2 coating had the most hydrophobic behavior. An adhesion test (method B, tape test) was performed on prepared coatings to check the quality of adhesion with the substrate aluminum alloy AA6061. The neat epoxy coating (EHS0GO0) displayed a fair adhesion rating of 3B, while EHS9GO2 coating exhibited excellent adhesion (5B) with substrate AA6061. Furthermore, electrochemical impedance spectroscopy and potentiodynamic polarization tests were employed for assessing the electrochemical behavior and anticorrosion performance of the prepared coatings. It was observed from the Bode plot, that the impedance magnitude/modulus for EHS9GO2 at lower frequencies was the highest as compared to other samples during immersion in the artificial seawater. The bare aluminum alloy substrate AA6061 had the highest corrosion rate of value 0.10483 ± 0.00198 mm/year, due to the direct contact with the electrolyte. Moreover, the highest value of Ecorr (356 ± 0.42 mV) and lowest values of Icorr (0.18 ± 0.03µA), βa (48.7 ± 2 mV/decade), and βc (28.8 ± 1 mV/decade) were witnessed for EHS9GO2 coating, showing significant anticorrosion efficiency against the corrosive electrolyte. Note de contenu : - EXPERIMENTAL : Materials, chemicals, and reagents - Epoxy resin and curing agent attributes - Surface modification of SiO2 particles - Synthesis of graphene oxide (GO) - Elemental composition of AA6061 - Fabrication of AA6061 and composite samples - Characterization - RESULTS AND DISCUSSION : Reaction mechanism - FTIR spectroscopy analysis - X-ray diffraction (XRD) examination - Contact angle measurement - Coatings adhesion assessment - Morphology - Electrochemical and corrosion protection performance DOI : https://doi.org/10.1007/s11998-023-000906-z En ligne : https://drive.google.com/file/d/1I2CSf8KcWcqezmqEPi0ol1DY5PitpxlV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41310 [article]

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Methylcyclohexyl diamine (Baxxodur EC 210) - a hardener for epoxy systems with superior carbamate stability / Irene Gorman in SURFACE COATINGS INTERNATIONAL, Vol. 101.5 (10-11/2018)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 101.5 (10-11/2018) . - p. 258-262 Titre : Methylcyclohexyl diamine (Baxxodur EC 210) - a hardener for epoxy systems with superior carbamate stability Type de document : texte imprimé Auteurs : Irene Gorman, Auteur ; Michael Henningsen, Auteur ; Frank Hettche, Auteur ; Matthaeus Kopczynski, Auteur ; Alexander Panchenko, Auteur ; Marc Hofmann, Auteur ; Chin Li, Auteur ; Raj Sundar, Auteur Année de publication : 2018 Article en page(s) : p. 258-262 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Calorimétrie Diamine Une diamine est un type de polyamine contenant exactement deux groupes amine. Les diamines sont principalement utilisées comme monomères pour synthétiser des polyamides, des polyimides et des polyurées. La principale diamine produite est le 1,6-diaminohexane, précurseur du Nylon 6-6, suivie de l'éthylènediamine1. L'hydrazine (H2NNH2) n'est en général pas considérée comme une diamine puisque ce n'est ni une amine (pas de carbone), ni une dibase. Epoxydes Éther de diglycidyle et de bisphénol A Réticulants Revêtements -- Additifs Revêtements -- Propriétés mécaniques Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy-based industrial maintenance coatings «fer excellent chemical and mechanical performance. However, the amine type hardeners often employed can easily react with atmospheric carbon dioxide and moisture to form carbamate salts. These carbamate salts accumulate on the surface and cause blush and intercoat adhesion issues. Adducts based on methylcyclohexyl diamine (MCDA, Baxxodur EC 210), a cycloaliphatic diamine curative for epoxy resin systems, displayed enhanced carbamate stability when compared to adducts based on both isophorone diamine (IPDA) and m-xylylene diamine (MXDA). This behaviour was further validated in coating tests, where coating formulations based on MCDA exhibited superior gloss. The cure behaviour, mechanical properties, and thermal properties of MCDA, IPDA, and MXDA cured systems were also assessed using various analytical techniques such as differential scanning calorimetry and rheology. Overall, MCDA was proven to be an attractive building block for epoxy diamine industrial coating systems. Note de contenu : - EXPERIMENTAL : Materials - Adduct synthesis - Preparation of reactive DGEBA-adduct mixtures - Methods - RESULTS AND DISCUSSION : Adduct production - Thermal properties - Rheological properties - Carbamate stability - Fig. 1 : Diamine-type epoxy hardeners employed in this study - Fig. 2 : Idealised MCDA-based adduct - Fig. 3 : Viscosity development of DGEBA hardened with the various adducts and adduct-BnOH mixtures, at a) 23°C and b) 75°C. Viscosity data for DGEBA hardened with IPDA-A8 is not reported because the starting viscosity of this formulation exceeded 10000 mPas - Fig. 4 : Shore D development over time of DGEBA hardened with MCDA-A16, IPDAA16, and MXDA-A16 adducts at 23°C (ambient atmosphere) - Fig. 5 : Adducts and adduct-BnOH mixtures aged at 23°C and 50% relative humidity for 48 hours. The presence of carbamates was detected visually through the observation of white precipitate or surface irregularities, as was the case for IPDA-A2.5-BnOH - Fig. 6 : Carbamate stability of pure adducts and adduct-BnOH mixtures aged at 23°C and 50% relative humidity, and spectral gloss readings of DGEBA hardened with A2.5-BnOH adducts at 8°C and 70% relative humidity - Table 1 : Summary of adducts and adduct-BnOH mixtures - Table 2 : Thermal properties of DGEBA hardened with adducts and adduct-BnOH mixtures - Table 3 : Rheological properties of DGEBA hardened with adducts and adduct-BnOH mixtures - Table 4 : Shore D and tack development of DGEBA hardened with adducts and adduct-BnOH mixtures En ligne : https://drive.google.com/file/d/1dnph6wSwc5MaA4x6fGb3WMYc6rqh8L6d/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31657 [article]

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Multi-detection method for the fast screening of bisphenol A diglycidyl ether conjugates in the can-coating material / Monika Beszterda in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 6 (11/2022) . - p. 1901-1907 Titre : Multi-detection method for the fast screening of bisphenol A diglycidyl ether conjugates in the can-coating material Type de document : texte imprimé Auteurs : Monika Beszterda, Auteur ; Magdalena Tadrowska, Auteur Année de publication : 2022 Article en page(s) : p. 1901-1907 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chromatographie en phase liquide à hautes performances Criblage Éther de diglycidyle et de bisphénol A Ions Spectrométrie de masse Index. décimale : 667.9 Revêtements et enduits Résumé : Untargeted screening high-pressure liquid chromatography-mass spectrometry method for the bisphenol A diglycidyl ether conjugates (BADGEs) present in the can-coating material was developed. The method was based on the detection of ions [M+H]+, [M+NH4]+, [M+Na]+ and the respective product ions formed as a result of the cone voltage-induced fragmentation, mainly those at m/z 135, 191, and 207. The method allowed the detection of the most common and most abundant BADGEs present in the can-coating materials, namely H2O, BuEtOH, and BPA adducts. DOI : https://doi.org/10.1007/s11998-022-00668-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00668-0.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38506 [article]

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Recent developments in UV cure epoxy acrylate oligomers / R. D. Kulkarni in PAINTINDIA, Vol. LXI, N° 7 (07/2011)

[article]  inPAINTINDIA > Vol. LXI, N° 7 (07/2011) . - p. 58-64 Titre : Recent developments in UV cure epoxy acrylate oligomers Type de document : texte imprimé Auteurs : R. D. Kulkarni, Auteur ; M. E. Chaudhari, Auteur ; S. Mishra, Auteur Année de publication : 2011 Article en page(s) : p. 58-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages. Epoxydes Éther de diglycidyle et de bisphénol A Oligomères Réticulation (polymérisation) Revêtements -- Séchage sous rayonnement ultraviolet Tags : 'UV  curing'  Oligomères  'Éther  de  diglycidyle  et  bisphénol  A'  'Epoxy  acrylate'  'Epoxyde  cycloaliphatique'  'Monomère  acrylate  hybride' Index. décimale : 667.9 Revêtements et enduits Résumé : The performance properties and industrial applications of epoxy acrylate prepolymer based UV cure coatings are primarilygoverned by the nature of structural modification in backbone / en capping of pre polymer. The present review paper therefore covers the recent developments in the synthesis and characterisation of diverse epoxy acrylate oligomers including acrylate capped BPA/novolac epoxy, epoxidised oils and cycloaliphatic epoxy systems. The alkoxysilane, siloxane, adipic acid, fluorinated and phenyl phtalazinone modifications of epoxy diacrylate for obtaining special performance properties have been highlighted. Note de contenu : - Acrylated bisphenol-A epoxy oligomers - Epoxy novolac (meth)acrylate oligomers - Acrylated epoxidised oils and cycloaliphatic hybrid epoxy acrylates - Modified speciality epoxy acrylate oligomers : Alkoxysilane modified epoxy acrylate oligomer - Polydimethylsiloxane epoxy acrylate oligomer - Adipic acid modified methacrylated epoxy resin - Epoxy methacrylate with phenyl phthalazinone backbone - Applications of epoxy acrylate UV cure coatings (Reinhold S., 2006) Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11870 [article]

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Tentative identification of BADGE derivatives in epoxy type coatings in a model sample: a beverage can in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)

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