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Modification of styrene-acrylic emulsion by organic UV absorber in synergy with fluorine and silicon monomers for weatherable coatings / Wei Dong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)
[article]
Titre : Modification of styrene-acrylic emulsion by organic UV absorber in synergy with fluorine and silicon monomers for weatherable coatings Type de document : texte imprimé Auteurs : Wei Dong, Auteur ; Lei Zhou, Auteur ; Yanni Guo, Auteur ; Yining Tang, Auteur ; Rong Pan, Auteur ; Mengli Liu, Auteur ; Deliang He, Auteur Année de publication : 2022 Article en page(s) : p. 607-616 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Benzotriazole
Caractérisation
Copolymère styrène acrylique
Copolymères en émulsion
Enrobage (technologie)
Essais accélérés (technologie)
Fluorure de silicium
Formulation (Génie chimique)
Polymérisation en émulsion
Potentiel zeta
Rayonnement ultraviolet -- Absorption
Résistance aux conditions climatiques
Revêtements organiques
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : To improve the weather ability and thermal stability of styrene-acrylic polymer emulsion coatings, a series of novel styrene-acrylic polymer emulsion modified with 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl]-2H-benzotriazole (HMEB), hexafluorobutyl methacrylate (HFMA), and vinyl-trimethoxysilane (VTMS) were prepared through semi-continuous seed emulsion polymerization. The emulsions and their coatings were characterized by Fourier transform infrared spectroscopy, ultraviolet absorption spectroscopy (UV-Vis), X-ray photoelectron spectroscopy, dynamic laser scattering, transmission electron microscopy, zeta potential, thermogravimetric analysis, and artificially accelerated aging test. According to the results, the new polymer emulsion had superior UV absorption from 308 to 364 nm. Moreover, the coating performed the best anti-aging stability when the content of HMEB, HFMA, and VTMS reached 4%, 2%, and 3%, respectively. After the 1000 h aging test, the color difference (ΔE) and rate of loss of gloss (ΔG) were only 6.86% and 51.10%, while the unmodified coatings were 16.05% and 72.22%, respectively. Furthermore, the thermal stability and water resistance of the coating were improved by fluorine and silicon monomers. The initial decomposition temperature was increased from 327 to 339°C. Moreover, the UV stabilization mechanism is preliminarily discussed. Note de contenu : - EXPERIMENTAL : Materials - Pre-emulsification - Emulsion polymerization - Coating preparation - Characterization
- RESULTS AND DISCUSSION : Basic properties of emulsions and the coatings - Zeta potential and DLS of emulsions - Morphology of emulsion particles - Chemical structure of emulsion polymer - Chemical composition of emulsion coatings - UV absorption property of coatings - Thermal stability of emulsion coating - The aging acceleration test of emulsion coatings - Protective properties of emulsion coatings
- Table 1 : Emulsion polymerization formula
- Table 2 : Basic properties of emulsions and the coatings
- Table 3 : Surface composition of different coatings/atomic %DOI : https://doi.org/10.1007/s11998-021-00550-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00550-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37291
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 607-616[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23408 - Périodique Bibliothèque principale Documentaires Disponible Rapid determination of aziridine in leathers by headspace-gas chromatography/mass spectrometry (HS-GC-MS) / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 5 (09-10/2017)
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Titre : Rapid determination of aziridine in leathers by headspace-gas chromatography/mass spectrometry (HS-GC-MS) Type de document : texte imprimé Auteurs : Yu Lingyun, Auteur ; Peiqiang Shuai, Auteur ; Jiagntao Hu, Auteur ; Wu Mengru, Auteur ; Xiaojin Li, Auteur ; Lei Zhou, Auteur ; Dong Wei, Auteur Année de publication : 2017 Article en page(s) : p. 227-230 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie)
AziridineL'aziridine (n.f.) ou azacyclopropane est le composé organique cyclique de formule brute C2H5N. Elle est aussi le composé parent des aziridines et du groupe fonctionnel qui correspond à un hétérocycle à trois côtés composé d'une amine et de deux groupes méthylène.
Chromatographie en phase gazeuse
Cuirs et peaux -- Analyse
Extraction (chimie)
Spectrométrie de masseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Aziridine is a kind of highly toxic organic matter, while it is used as a leather finishing cross-linker at room temperature, especially used in waterborne acrylic resins and aqueous polyurethane. In this work, a straightforward, reliable and effective automated method has been developed for the direct determination of aziridine in leathers, based on headspace technique. Separation, identification and quantification were carried out by headspace-gas chromatography-mass spectrometry (HS-GC-MS) in selected ion monitoring (SIM) mode. The precision was satisfactory with relative standard deviations (RSD) in the range 1.7/0-4.1% for leathers. Limit of detection was 0.1 mg kg-1 for. Leathers. Note de contenu : - EXPERIMENTAL PROCEDURE : Reagents and standards - Gas chromatography/mass spectrometry - Headspace operating conditions - GC-MS operating conditions - Mass selective detection parameters - General procedure : Sample preparation - Calibration curve
- RESULTS AND DISCUSSION : Optimization of sample extraction in headspace samples - Optimisation of GC column - Validation of the analysis of aziridine using HS-GC-MS - Determination of aziridine in leather samplesEn ligne : https://drive.google.com/file/d/1l2yXqV7GBACdMZAYG9b02kx3uuE5TwT_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29236
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 5 (09-10/2017) . - p. 227-230[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19275 - Périodique Bibliothèque principale Documentaires Disponible