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A fluorine–silicone acrylic resin modified with UV-absorbing monomers and a free radical scavenger / Huibin Lei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)
[article]
Titre : A fluorine–silicone acrylic resin modified with UV-absorbing monomers and a free radical scavenger Type de document : texte imprimé Auteurs : Huibin Lei, Auteur ; Deliang He, Auteur ; Jun Hu, Auteur ; Ping Li, Auteur ; Haihong Huang, Auteur Année de publication : 2018 Article en page(s) : p. 809-817 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet
Absorption
Angle de contact
Antiradicalaire
Fluor
Hydrophobie
Polyacryliques
Radicaux libres (chimie)
Rayonnement ultraviolet
Résistance aux conditions climatiques
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Vernis -- Propriétés mécaniquesIndex. décimale : 667.9 Revêtements et enduits Résumé : A novel UV-absorbing and free-radical-catching fluorine–silicone acrylic resin with 2-(4-benzoyl-3-hydroxyphenoxy) ethyl acrylate (BHEA), 2,2,6,6-tetramethyl-4-piperidyl methacrylate (TMPM), dodecafluoroheptyl methacrylate (DFMA) and 3-methacryloxypropyltrimethoxysilane (MPS) as functional monomers was successfully synthesized by solution copolymerization. Based on various investigations, our characterization results for the resin and its coating indicated that the resin exhibits high UV-absorbing and free-radical-catching performances, and the hydrophobicity of the varnish coating was promoted by the actions of fluorine and silicone. In addition, the weatherability improved because of the enduring triple protection of the UV absorbent (BHEA), free-radical-catching agent (TMPM), fluorine (DFMA) and silicone (MPS). After a 1000-h aging test, the color difference (∆E) and rate of loss of gloss (∆G) of varnish coatings were 2.96% and 62%, respectively, and the impact strength and flexibility of color paint coatings were 420 N cm and 2 mm, respectively. Moreover, the chemically bonded free-radical-catching agent (TMPM) showed a more enduring performance for producing nitroxides than the simple blend. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the resins and coatings - Characterizations
- RESULTS AND DISCUSSION : FTIR analysis - X-ray photoelectron spectroscopy (XPS) analysis - Ultraviolet absorption properties - Free-radical-catching performance - Water contact angle (CA) - Weather resistance - Mechanical propertiesDOI : 10.1007/s11998-018-0078-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0078-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30858
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 809-817[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20078 - Périodique Bibliothèque principale Documentaires Disponible 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