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Synthesis of acrylic-modified water-reducible alkyd resin: improvement of corrosion resistance in painting formulations / Figen Aynali in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)
[article]
Titre : Synthesis of acrylic-modified water-reducible alkyd resin: improvement of corrosion resistance in painting formulations Type de document : texte imprimé Auteurs : Figen Aynali, Auteur ; Gürcan Sakar, Auteur ; Elif Suna Kocyigit, Auteur ; Alper Kades, Auteur Année de publication : 2023 Article en page(s) : p. 2007-2017 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylique
Adhésion
Anticorrosifs
Anticorrosion
Caractérisation
Matériaux -- Modifications chimiques
Monomères
Organosilanes
Polyalkydes
Polymères -- Synthèse
Revêtements -- Effets de l'humidité:Peinture -- Effet de l'humidité
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements organiques
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, we investigated the effect of organosilane monomer on the adhesion strength and corrosion protection of the water-reducible alkyd coatings. For this purpose, firstly, alkyd resin was synthesized and modified with acrylic monomers by changing organosilane monomer content in the range of 4–16 wt% in all acrylic monomer compositions. Then, the carboxyl groups on the hybrid resins were neutralized with a base and the coating recipes were formulated using these water-reducible resins. The chemical structure and composition of the synthesized polymers were confirmed using 1H-NMR and FTIR spectroscopies. Mechanical properties of coatings applied on the cold-rolled steel surfaces were investigated via crosshatch adhesion, pendulum hardness, gloss, impact, and conical mandrel bend tester. According to the results, it can be said that water-reducible acrylic-modified alkyd coatings offer a good balance of hardness and flexibility. Then, the line was scratched parallel to the coating system and the surface coating properties of the coated panels, such as the adhesion strength after being exposed to humidity and corrosion resistance, were comparatively investigated. The best results for corrosion resistance and adhesion strength were obtained with the coating which was formulated with the resin having organosilane monomer of 8 wt% in all acrylic monomer mixtures. As the organosilane monomer amount increased to 16 wt%, the coatings’ corrosion resistance and adhesion strength decreased. As a result, it was observed that organosilane modification is significantly effective in improving the adhesion strength and corrosion resistance of water-reducible alkyd coatings. However, increasing the amount of silane monomer may reverse the positive results obtained. This study also reveals significant results about the correlation between the adhesion strength and corrosion resistance of coatings by presenting visual results. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of water-reducible acrylic-modified alkyd resin - Characterization
- RESULTS AND DISCUSSION : Resin - Coating
- Table 1 : The recipe for acrylic modification of alkyd resin
- Table 2 : The properties of synthesized acrylic-modified alkyd resins, VTMS % (wt.) in acrylic monomer composition
- Table 3 : Mechanical properties of coatings applied on the CRS surfaces
- Table 4 : Adhesion results of all panels after exposure to humidityDOI : https://doi.org/10.1007/s11998-023-00795-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00795-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40177
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 2007-2017[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24337 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of conducting PANi/SiO2 nanocomposites and their effect on electrical and mechanical properties of antistatic waterborne epoxy coating / Anh Son Nguyen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
[article]
Titre : Synthesis of conducting PANi/SiO2 nanocomposites and their effect on electrical and mechanical properties of antistatic waterborne epoxy coating Type de document : texte imprimé Auteurs : Anh Son Nguyen, Auteur ; Thuy Duong Nguyen, Auteur ; Thu Thuy Thai, Auteur ; Anh Truc Trinh, Auteur ; Gia Vu Pham, Auteur ; Hoang Thai, Auteur ; Dai Lam Tran, Auteur ; Thi Xuan Hang To, Auteur ; Duy Trinh Nguyen, Auteur Année de publication : 2020 Article en page(s) : p. 361-370 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antistatiques
Dioxyde de silicium
Epoxydes
Matériaux hybrides
Polyaniline
Polymères -- Propriétés électriques
Polymères en émulsion
Revêtements -- Propriétés mécaniques
Revêtements en phase aqueuse -- Additifs
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyaniline (PANi) has been intensively incorporated in epoxy coatings as a conducting material. However, epoxy coatings containing PANi have poor mechanical properties. In this study, polyaniline/silica (PANi/SiO2) nanocomposites with different contents of silica were prepared via in situ chemical oxidative polymerization method. Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and zeta potential measurements were used to examine the structure and the morphology of synthesized PANi/SiO2 nanocomposites. The thermal and electrical properties of the nanocomposite were studied by thermogravimetric analysis (TGA) and standard four-probe electrode method. It was shown that silica (SiO2) nanoparticles were covered by PANi in PANi/SiO2 nanocomposites and the electrical conductivity of nanocomposites decreased with the increase in SiO2 content. The PANi/SiO2 nanocomposite with 4.1 wt% SiO2 had a conductivity of 7.6 x 10-2 S/cm and that of PANi was 8.7 x 10-2 S/cm. Consequently, epoxy coatings containing 30 wt% PANi/SiO2 nanocomposites displayed a higher surface and volume resistance than the one containing pure PANi. In contrast, the increase in SiO2 content in PANi/SiO2 nanocomposite enhanced the mechanical properties of the epoxy coating, compared to epoxy coating containing pure PANi. The coating containing PANi/SiO2 nanocomposite with 17.2 wt% silica presented good mechanical properties (20 L/mil abrasion resistance, 100 kg cm impact strength) and admissible surface and volume resistivity (1.3 x 1011 Ω/cm2 and 6.6 x 10 10 Ω cm, respectively) for antistatic coatings. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PANi/Sio2 nanocomposites - Preparation of Coatings - Analytical characterization - Conductivity measurement - Mechanical resistance measurement
- RESULTS AND DISCUSSION : Characterization of PANi/SiO2 nanocompositeEn ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00279-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33987
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Code-barres Cote Support Localisation Section Disponibilité 21658 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of a curing agent containing trifunctional epoxy groups for powder coatings and its curing reaction kinetics / Qiuping Su in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)
[article]
Titre : Synthesis of a curing agent containing trifunctional epoxy groups for powder coatings and its curing reaction kinetics Type de document : texte imprimé Auteurs : Qiuping Su, Auteur ; Zilun Tang, Auteur ; Jiajian He, Auteur ; Yuxin Gu, Auteur ; Yong Li, Auteur ; Jing Xie, Auteur ; Shaoshun Wang, Auteur ; Ruijun Lin, Auteur ; Xiaofeng Lin, Auteur ; Wenjing Lin, Auteur ; Guobin Yi, Auteur Année de publication : 2022 Article en page(s) : p. 907-917 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cinétique chimique
Composés organiques -- Synthèse
Morphologie (matériaux)
Polyesters
Polymérisation
Réticulants
Revêtements organiques
Revêtements poudre
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work, tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC) was synthesized by a new two-step method without using harmful epichlorohydrin and served as a curing agent for polyester powder coatings. The chemical structure of TOTC was determined by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The curing behavior and the curing reaction kinetics of TOTC/polyester resin (NH-3307) system were studied by dynamic differential scanning calorimetry. The activation energy Ea was 71.75 kJ mol-1 according to Flynn–Wall–Ozawa method, and the curing reaction of TOTC/NH-3307 system was described by Friedman method. It was found that the curing reaction of TOTC/NH-3307 system was a two-parameter autocatalysis which followed the Å estάk–Berggren model. The nonisothermal curing reaction rate was simulated according to the Å estάk–Berggren model and the experimentally parameters. What is more, the thermogravimetric analysis results showed that the TOTC/NH-3307 system had good thermal stability with an initial decomposition temperature of 374.92°C. The TOTC/NH-3307 cured film exhibited excellent leveling performance by SEM. The results demonstrated that TOTC has efficient curing ability and huge market potential. Note de contenu : - Experimental : Materials
- Methods : Synthesis of triallyl benzene-1,3,5-tricarboxylate (TATC)
- Synthesis of tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC)
- Preparation of powder coatings
- Characterization and instrumentation
- Results and discussion : Synthesis and characterization of TOTC
- Curing kinetics and mechanism analysis : Nonisothermal DSC cure
- Curing kinetics
- Curing mechanism
- Thermal stability analysis
- Surface morphology analysis
- Table 1 : Characteristic parameters of TOTC/NH-3307 powder coating system
- Table 2 : Characteristic peak conversion values and calculated kinetic parameters for autocatalytic model at different heating ratesDOI : https://doi.org/10.1007/s11998-021-00578-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00578-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38085
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Code-barres Cote Support Localisation Section Disponibilité 23605 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of epoxy resins using phosphorus-based precursors for flame-retardant coating / Siddhesh Mestry in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
[article]
Titre : Synthesis of epoxy resins using phosphorus-based precursors for flame-retardant coating Type de document : texte imprimé Auteurs : Siddhesh Mestry, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2019 Article en page(s) : p. 807-818 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dichlorure de phénylphosphonique
Epoxydes
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Polymères -- Synthèse
Revêtements -- Analyse
Revêtements -- Propriétés mécaniques
Revêtements organiques
Revêtements protecteurs
Trichlorure de phosphoryleLe trichlorure de phosphoryle, ou oxychlorure de phosphore, est un composé chimique de formule brute POCl3.
Le trichlorure de phosphoryle réagit avec l'eau et les alcools pour donner du chlorure d'hydrogène et respectivement de l'acide phosphorique et des esters de phosphate : POCl3 + 3 H2O → H3PO4 + 3 HCl.
POCl3 peut également réagir avec une base de Lewis pour former des composés d'addition avec différents acides de Lewis tels que le tétrachlorure de titane : Cl3P+-O- + TiCl4 → Cl3P+-O--TiCl4.
Le composé POCl3·AlCl3 résultant de l'addition de chlorure d'aluminium sur le trichlorure de phosphoryle est assez stable, de sorte que POCl3 peut être utilisé pour éliminer le chlorure d'aluminium du mélange résultant d'une réaction de Friedel-Crafts.
POCl3 réagit avec le bromure d'hydrogène en présence de chlorure d'aluminium pour former le tribromure de phosphoryle POBr3.Index. décimale : 667.9 Revêtements et enduits Résumé : Materials imparting flame retardancy play a pivotal role in the development of advanced materials due to their ability to reduce the annihilating effect of fire on man and environment. Realizing the commercial significance of epoxy resins, an attempt has been made to enhance their flame retardancy even under demanding conditions. Among the various flame-retardant materials, phosphorus-containing compounds are gaining interest both in academic and industrial areas due to their simple mechanism of action which involves char formation, a barrier between the substrate and the fire which protects the substrate from being burnt. In the present research work, unconventional starting material—diethanolamine—was used to synthesize phosphorus-based flame-retardant precursors. Intermediates formed in first step were reacted with epichlorohydrin to form epoxy resins. Structure of the compounds was confirmed by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, hydroxyl, and epoxy values. Resins were cured with commercial polyamide, and properties were compared with commercial epoxy resin. Coating films were characterized by various physical, mechanical, and thermal properties like impact resistance, pencil hardness, gloss, solvent resistance, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The TGA and DSC results showed that the char yield value has increased from 3.36 to 8.53%, and the glass transition temperature (Tg) has increased from 72.86 to 82.05°C while the initial degradation temperature decreased. Coatings showed excellent flame retardancy with maximum Limiting Oxygen Index value of 35 and a self-extinguishing behavior as confirmed by the UL-94 test. Note de contenu : - EXPERIMENTAL : Materials - Reaction of DEA with PPDC/POCl3 - Synthesis of epoxy resin from P-1 and P-2 - Preparation of FR coating
- CHARACTERIZATION : Physicochemical analysis - Fourier transform infrared (FTIR) spectroscopy - Nuclear magnetic resonance (NMR) spectroscopy - Thermogravimetric analysis (TGA) - Differential scanning calorimetry (DSC) analysis - Mechanical properties - Gel content - Water absorption - Solvent scrub resistance and gloss - ILimiting Oxygen Index (LOI) - UL-94 vertical burning test
- RESULTS AND DISCUSSION : Physicochemical analysis - FTIR spectroscopy - NMR spectroscopy - Thermogravimetric analysis (TGA) - DSC analysis - Mechanical properties - Gel content - Water absorption - Solvent scrub resistance and gloss - LOI - UL-94 vertical burning testDOI : 10.1007/s11998-018-00157-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00157-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32592
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Code-barres Cote Support Localisation Section Disponibilité 20953 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of fluorinated polyacrylic acrylate oligomer for the UV-curable coatings / Jianbing Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
[article]
Titre : Synthesis of fluorinated polyacrylic acrylate oligomer for the UV-curable coatings Type de document : texte imprimé Auteurs : Jianbing Wu, Auteur ; Ruofei Zhang, Auteur ; Ping Li, Auteur ; Guozhang Ma, Auteur ; Caiying Hou, Auteur ; Hui Zhang, Auteur Année de publication : 2019 Article en page(s) : p. 681-688 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Copolymère acrylate polyacrylique fluoré
Essais (technologie)
Fourier, Spectroscopie infrarouge à transformée de
Hydrophobie
Oléophobie
Oligomères
Résistance à l'humidité:Résistance à l'eau
Résistance chimique
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Stabilité thermique
Surfaces (technologie)Index. décimale : 667.9 Revêtements et enduits Résumé : A series of novel fluorinated polyacrylic acrylate oligomers with different fluorine contents were successfully prepared by acid–epoxy reaction between acrylic acid and a glycidyl methacrylate (GMA)-functional acrylic copolymer, which was presynthesized by traditional free radical polymerization in solvent with ethyl methacrylate, n-butyl acrylate, dodecafluoroheptyl methacrylate, and GMA. The UV-curable coatings were prepared with various amounts of the obtained fluorinated polyacrylic acrylate oligomer. The influences of fluorine content on the properties of UV-curable films were investigated by the tests of hydrophobicity, oleophobicity, thermal stability, water absorption, hardness, and chemical resistance. The results showed that the water contact angle of cured films increased from 78.5° to 104.5°, n-hexadecane contact angles increased from 12.3° to 43.4°, the water absorption decreased from 1.27% to 0.63%, while the fluorine content of the cured films increased from 0 to 5.7 wt%. In addition, thermal stability and chemical resistance of the curable films containing fluorinated oligomer were also clearly improved. Note de contenu : - EXPERIMENTAL : Materials - Preparation of fluorinated polyacrylic acrylate oligomer (FPAO) - Preparation of UV-curable coatings - Instrument and characterization
- RESULTS AND DISCUSSION : Synthesis and characterization of the FPAO - Effect of the content of FPAO on the properties of UV filmsDOI : 10.1007/s11998-018-0145-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0145-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32581
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