Antistatic and antibacterial two-component waterborne polyurethane coating / Xianwen Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 869-881 Titre : Antistatic and antibacterial two-component waterborne polyurethane coating Type de document : texte imprimé Auteurs : Xianwen Li, Auteur ; Xinmeng Xu, Auteur ; Faai Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 869-881 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Antistatiques Caractérisation Cuivre Nanoparticules Polyaniline Polyuréthanes Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Zircone Le dioxyde de zirconium ou oxyde de zirconium(IV) couramment appelée zircone est un composé inorganique du zirconium de formule ZrO2. Ce matériau est une céramique technique d'aspect opaque. Appelé CZ (Cubic Zirconia) lorsque transparent, il est utilisé pour imiter le diamant. Il ne faut pas le confondre avec le zircon (ZrSiO4). Sous sa forme tétragonale, l'oxyde de zirconium est un matériau a vocation mécanique, cette évolution cristallographique lui confère une dureté très élevée (1200Hv) ainsi qu'une bonne résistance aux sollicitations mécaniques (700Mpa en traction et 2000Mpa en compression). Une fois polie, la zircone tétragonale peut atteindre un Ra de 0,02, ce qui permet de l'utiliser pour des pièces de frottement. Index. décimale : 667.9 Revêtements et enduits Résumé : Hydroxyl acrylate emulsion was prepared firstly by the semicontinuous seeded emulsion polymerization, and then adding polyaniline (PANI)/Cu/ZrO2 ternary nanocomposites, two-component waterborne polyurethane (2 K WPU) composite coatings with antistatic and antibacterial properties were obtained by mixing the emulsion with hydrophilic modified polyisocyanate. The structure and morphology of the PANI/Cu/ZrO2 were observed by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffractometer. The thermal, antistatic, antibacterial, anticorrosion, and mechanical properties of the 2 K WPU composite coatings were determined. The results showed that the addition of the ternary nanocomposites increased the antistatic, antibacterial, anticorrosion, and mechanical properties of the 2 K WPU coating. The initial decomposition temperature increased from 200 to 225°C, and the tensile strength increased by 44.4%. The coatings still maintained good impact strength of 50/50 kg cm, adhesion of grade 2, flexibility of 1 mm, pendulum hardness of 293 s, and the gloss (60°) of 119.4. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of PANI/Cu and PANI/Cu/ZrO 2 nanocomposites - Preparation of hydroxyl acrylate emulsion - Preparation of 2 K WPU film - Preparation of antibacterial and antistatic - 2 K WPU coatings - Preparation of culture medium - Characterization - Determination of surface electric resistance - Qualitative antibacterial test - Quantitatively antibacterial test - Coating anticorrosion resistance testing - Tinplate surface analysis - Adhesion, pendulum hardness, impact resistance, and gloss of films testing - Mechanical properties test - RESULTS AND DISCUSSION : FTIR - SEM images - XRD - Thermogravimetric analysis (TGA) - Antistatic property - Antibacterial property - Anticorrosion performance of the composite coatings - Coating performance of 2 K WPU composite - Table 1 : Effect of PANI/Cu/ZrO2 content on film performance of 2 K WPU DOI : https://doi.org/10.1007/s11998-022-00708-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00708-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39434 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24069	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Imidization of styrene-maleic anhydride copolymer for dispersing nano-SiO2 in water / Tao Xue in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1867-1880 Titre : Imidization of styrene-maleic anhydride copolymer for dispersing nano-SiO2 in water Type de document : texte imprimé Auteurs : Tao Xue, Auteur ; Caili Yu, Auteur ; Zhongqun Zhou, Auteur ; Faai Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 1867-1880 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie) Analyse thermique Caractérisation Copolymère styrène-maléimide Copolymères -- Synthèse Dioxyde de silicium Nanoparticules Poids moléculaires Solutions aqueuses (chimie) Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Achieving functional styrene-maleic anhydride (SMA) copolymer dispersant is highly attractive but still remains a challenge. Conventional modified SMA dispersants have complex modification steps, poor performance, and limited applications. Thus, a series of styrene–maleimide (SMI) copolymers with different functionality as amphiphilic dispersants for dispersing nano-SiO2 in an aqueous solution were synthesized using a simple preparation process. The changes in the maleic anhydride groups during imidization were tracked using FTIR spectroscopy, 1H-NMR, and GPC. A rotational viscometer and an inverted bottle method were used to measure the viscosity and coagulation time of the nano-SiO2 aqueous dispersion system, respectively, after adding the SMI dispersants. The particle size, size distribution, and dispersant adsorption amount of the dispersion were analyzed using laser particle size analysis ; FTIR spectroscopy and SEM; and TGA, respectively. The results showed that the hydrogen bonds formed between the amino groups in the dispersant and the hydroxyl groups on the SiO2 surface during stirring allowed the dispersant to be adsorbed onto the SiO2 surface after being added to the nano-SiO2 aqueous system. The addition of the SMI dispersant enhanced the steric hindrance and electrostatic repulsion between the nanoparticles, thus making it possible for the SiO2 nanoparticles not to easily aggregate in water, improving their dispersity and stability. Additionally, the type and amount of SMI dispersant used significantly affected the SiO2 nanoparticles' ability to disperse in water. This makes SiO2 particles convenient to use and transport, not produce dust pollution, and easy to store. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of styrene–maleimide dispersants - Preparation of nano-SiO2 aqueous system - Characterization - RESULTS AND DISCUSSION : Synthesis and characterization of the styrene-maleimide (SMI) copolymers - TGA analysis - DSC analysis - Dispersion of the nano-SiO2 aqueous system - Solubility of polymeric dispersant in different solvents - Table 1 : Recipe and properties of SMI dispersant - Table 2 : Molecular weight and PDI of SMA and SMI - Table 3 : Solubility of polymers in different solvents DOI : https://doi.org/10.1007/s11998-023-00783-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00783-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40167 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24337	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings / Aohuan Guo 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. 1311-1320 Titre : Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Aohuan Guo, Auteur ; Jianben Xu, Auteur ; Caili Yu, Auteur ; Faai Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 1311-1320 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluoropolymères Polyacrylates Polymérisation en émulsion Polyuréthanes Résistance à l'humidité:Résistance à l'eau Revêtements -- Propriétés mécaniques Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Traditional two-component waterborne polyurethane (2K WPU) has low water resistance, which limits its application in the wide field. In this work, fluorine-modified 2K WPU films (2K-WFPUs) were successfully prepared using a fluorine-modified acrylate emulsion as hydroxyl component and a hydrophilically modified polyisocyanate as curing agent. Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy analysis indicate that hexafluorobutyl acrylate (HFBA) was successfully introduced into the 2K-WFPUs. The effects of HFBA content on the surface, thermal stability, water resistance, mechanical, and application properties of 2K-WFPUs were investigated. Compared with the unmodified film, with the increase in HFBA level from 0 to 8%, the static water contact angle of 2K-WFPUs increased from 66° to 92°, the surface-free energy decreased from 42.7 to 28.4 mJ m−2, the water absorption reduced from 15.9 to 9.9%. Thermogravimetric analysis shows that the thermal stabilities of 2K-WFPUs were improved remarkably. Meanwhile, adding HFBA did not weaken the impact resistance, flexibility, and adhesion of 2K-WFPUs and maintained the highest level. The fluorine-modified 2K WPU coatings have potential application in wood furniture and automotive finishing. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the fluorine-containing acrylate emulsion - Preparation of 2K-WFPUs - Characterization - RESULTS AND DISCUSSION : Characterization of the emulsion - FTIR analysis - TGA analysis - DSC analysis - Surface analysis - Water resistance - Coating properties - Table 1 : Feeding monomer mixture recipe for preparation of emulsion - Table 2 : Mechanical and film properties of the 2K-WFPU coatings DOI : https://doi.org/10.1007/s11998-023-00893-1 En ligne : https://drive.google.com/file/d/1bSiVfzJh9q7RBxYlzKJWwxD3GjMFwWv_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41299 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24738	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)