Nano-silica-containing acrylic polyurethane and acrylic-polyester hybrid polyurethane coatings for direct-to-metal (DTM) coating applications – a comparative study / Sukanya Gangopadhyay 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. 1773-1786 Titre : Nano-silica-containing acrylic polyurethane and acrylic-polyester hybrid polyurethane coatings for direct-to-metal (DTM) coating applications – a comparative study Type de document : texte imprimé Auteurs : Sukanya Gangopadhyay, Auteur ; Prakash A. Mahanwar, Auteur Année de publication : 2022 Article en page(s) : p. 1773-1786 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Application directe sur le métal Chimie analytique Copolymère ester acrylique Copolymère uréthane acrylique Formulation (Génie chimique) Matériaux hybrides Nanoparticules Résistance aux conditions climatiques Résistance chimique Revêtements -- Propriétés mécaniques Revêtements -- Propriétés optiques Revêtements organiques Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : In the era of sustainability, direct-to-metal coatings have proven to be a promising solution as it eliminates the need for underneath primer coating layers. In the present study, two coating systems, viz. acrylic polyurethane and acrylic-polyester hybrid polyurethane nano-composite coatings, were prepared by addition of nano-silica in various loadings for direct-to-metal coating applications. The addition of nano-silica along with selected resin systems enables to meet desired mechanical properties, chemical resistance along with weathering and corrosion resistance of DTM coating system. Incredible improvement in the overall mechanical properties of the coating including pencil hardness and scratch resistance has been observed by the addition of nano-silica. SEM technique was employed to evaluate the nano-silica dispersion into the coating system along with its morphology. SEM studies revealed thorough dispersion of the nanoparticles within the coating matrix for both the coating systems. Thermal properties were studied by thermogravimetric analysis along with structural characterization by Fourier transform infrared spectroscopy. Thermal stability of both the coating systems increased with the addition of nano-silica; however, acrylic-polyester hybrid polyurethane coatings revealed better thermal stability at 8% nano-silica loading. Color and gloss changes were studied before and after 500 h exposure to a QUV chamber. Anticorrosive properties were evaluated by salt spray exposure for 700 h. At 8% nano-silica loading, acrylic-polyester hybrid polyurethane coatings revealed better weathering performance along with anticorrosive properties and chemical resistance owing to the presence of hybrid polymer chains. Note de contenu : - EXPERIMENTAL : Materials - Preparation of nano-composite DTM coating - polyurethane (PPT) nano-composite DTM coating - Application - Coating characterization - RESULTS AND DISCUSSION : Fourier transfer infrared spectroscopy (FTIR) analysis - Mechanical properties of coating formulations - Scanning electron microscopy (SEM) - Thermogravimetric analysis (TGA) of coatings - Chemical resistance of APT and PPT coatings - Optical properties - Corrosion and weathering resistance - Table 1 : Formulations of acrylic polyurethane (APT) nano-composite DTM coating - Table 2 : Formulations of acrylic-polyester hybrid - Table 3 : Mechanical properties of APT and PPT coatings at various nano-silica loadings - Table 4 : TGA of acrylic polyurethane (APT) DTM coating - Table 5 : TGA of acrylic-polyester hybrid polyurethane (PPT) DTM coating - Table 6 : Chemical resistance properties of APT and PPT coating systems at various nano-silica loading - Table 7 : Gloss reading at 60° inclination for APT and PPT coating systems at various nano-silica loading - Table 8 : Gloss measured 60° inclination before and after weathering test at various nano-silica loadings for APT and PPT coatings - Table 9 : Color changes (ΔE values) of specimens (APT and PPT coatings) before and after the QUV chamber exposure test DOI : https://doi.org/10.1007/s11998-022-00647-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00647-5.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38496 [article]

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Preparation of amphiphilic acrylate copolymer containing active epoxy group and its fatliquoring : Effect on aldehyde-tanned leather / Huang Yingying in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 93-97 Titre : Preparation of amphiphilic acrylate copolymer containing active epoxy group and its fatliquoring : Effect on aldehyde-tanned leather Type de document : texte imprimé Auteurs : Huang Yingying, Auteur ; Jinxia Du, Auteur ; Xu Zhang, Auteur ; Biyu Peng, Auteur ; Chunxiao Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 93-97 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Copolymère ester acrylique Copolymères -- Synthèse Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Epoxydes Glutaraldéhyde Huiles et graisses Polymères amphiphiles Polymérisation en émulsion Produits de nourriture du cuir Résistance à la déchirure Tannage chrome free Tannage organique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acrylic-acrylic long-chain ester amphiphilic copolymers are a class of leather retanning and fatliquoring materials with superior properties. However, these types of copolymers lack reactive groups and possess weak binding ability to organically-tanned leather. In this paper, a terpolymer Poly(AA-LA-GMA) containing reactive epoxy groups was prepared by emulsion copolymerisation of acrylic acid (AA), dodecyl acrylate (LA) and glycidyl methacrylate (GMA) monomers. The effect of the GMA content on its binding ability to leather fibres and its fatliquoring properties was investigated. The results showed that the introduction of the epoxy group can significantly improve the combination of copolymer with glutaraldehyde-tanned leather. When the content of GMA monomer reached 10% of the total monomer amount (mol), the dichloromethane extraction rate and fogging value of the fatliquored leather were reduced by about 34% and 53%, respectively. And the excellent binding ability improved the softness and tear strength of the fatliquored leather. Note de contenu : - INTRODUCTION : Materials - Synthesis of epoxy-modified amphiphilic copolymers - Determination of the content of the residual monomer - Fourier Transform Infrared spectroscopy (FTIR) - Application of Poly(AA-LA-GMA) in the fatliquoring process - Determination of the absorption rate of fatliquor - Determination of softness and tear strength of crust leather - Determination of dichloromethane extraction rate - Determination of fogging value - RESULTS AND DISCUSSION : Preparation and characterisation of Poly(AA-LAGMA) - Fatliquoring effects of Poly(AA-LA-GMA) on chrome-tanned leather - Fatliquoring effect of Poly(AA-LA-GMA) to glutaraldehyde-tanned leather - Action mechanism between epoxy-modified amphiphilic copolymer and leather - Table 1 : Fatliquoring effects of amphiphilic copolymers to chrome-tanned leather - Table 2 : Fatliquoring effects of amphiphilic copolymers to glutaraldehyde-tanned leather - Fig. 1 : Schematic of the copolymerisation reaction - Fig. 2 : Action mechanism between epoxy-modified amphiphilic copolymer and leather En ligne : https://drive.google.com/file/d/1KByCAQkl2D1o3TmoIgqbuA3ZMjFh8hZt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39579 [article]

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Promotion from within in ADHESIVE TECHNOLOGY, Vol. 18, N° 3 (09/2001)

[article]  inADHESIVE TECHNOLOGY > Vol. 18, N° 3 (09/2001) . - p. 14-15 Titre : Promotion from within Type de document : texte imprimé Année de publication : 2001 Article en page(s) : p. 14-15 Langues : Anglais (eng) Catégories : Adhésifs -- Additifs Adhésifs -- Séchage sous rayonnement ultraviolet Copolymère ester acrylique Polybutadiène Promoteurs d'adhésion Stratifiés Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The adhesives industry is finding an incrasingly prominent role for ultraviolet curable laminating adhesives as a method of bonding films and foil substrates. The role fo the adhesion promoter has never been more crucial, but making the right choice is vital. Note de contenu : - UV cured lamination - Polyester acrylates - Polybutadiene additives - Table 1 : Standard laminating adhesive formulation - Fig. 1 : Polyester acrylate adhesion polymers - Fig. 2 : Polybutadiene adhesion polymers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37341 [article]

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Properties and anticorrosion application of acrylic ester/epoxy core–shell emulsions: effects of epoxy value and crosslinking monomer / Ke Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1315-1324 Titre : Properties and anticorrosion application of acrylic ester/epoxy core–shell emulsions: effects of epoxy value and crosslinking monomer Type de document : texte imprimé Auteurs : Ke Zhu, Auteur ; Xiaorui Li, Auteur ; Jingyi Li, Auteur ; Haihua Wang, Auteur ; Guiqiang Fei, Auteur Année de publication : 2017 Article en page(s) : p. 1315-1324 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Copolymère ester acrylique Copolymères en émulsion Core-Shell Dispersions et suspensions Epoxydes Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : We first prepared an unsaturated epoxy resin ester (EM) by addition–esterification reaction with acrylic acid and then synthesized a series of acrylic ester/epoxy hybrid latexes (AE) with core–shell structure by semicontinuous emulsion polymerization method. The resultant AE emulsions are utilized as anticorrosion coatings of metals. The influences of EM content and crosslinking agent (PEG(400)DA) content on the physicochemical properties of the resultant emulsions and anticorrosion coatings of metals are investigated in detail. The AE emulsion displays better anticorrosion properties when it is prepared under the following conditions: the EM content of 30 wt% and PEG(400)DA content of 2.0 wt%. The relationships between the AE structure and anticorrosion properties of AE coatings are clearly illustrated. The corrosion resistances of AE coatings are not only depend on the crosslinking density, hydrophilic, and polarity among the AE chains, but also rely on the stability of the emulsion and the integrality and homogeneity of the coatings. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of waterborne acrylic ester/epoxy core–shell emulsions - Preparation of the films - Preparation of samples - Measurements - RESULTS AND DISCUSSION : FTIR analysis - TEM - Effect of EM content - Effect of PEG(400)DA content DOI : 10.1007/s11998-017-9930-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9930-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29636 [article]

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UV curable PSAs augment existing adhesive technologies / Tom Kauffman in ADHESIVES AGE, Vol. 41, N° 7 (07/1998)  

[article]  inADHESIVES AGE > Vol. 41, N° 7 (07/1998) . - p. 29-33 Titre : UV curable PSAs augment existing adhesive technologies Type de document : texte imprimé Auteurs : Tom Kauffman, Auteur ; Jim Chappell, Auteur ; Marga Acevedo, Auteur ; Mark Mitry, Auteur Année de publication : 1998 Article en page(s) : p. 29-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs -- Séchage sous rayonnement ultraviolet Adhésifs en phase solvant Adhésifs sensibles à la pression Copolymère ester acrylique Monomères Polymères ramifiés Réseaux neuronaux (informatique) Réticulation (polymérisation) Tackifiant (adhésifs) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Solvent-based, water-based and hot melt adhesives have a long history of success for pressure sensitive adhesive (PSA) tape and label applications. These technologies are seemingly well entrenched with adequate performance and low cost. Several market trends, however, are opening up new opportunities for UV curable PSAs. In contrast to solvent-based adhesives, UV curable PSAs contain no fugitive solvent and are therefore VOC compliant. In contrast to hot melts, UV curable adhesives offer a crosslinked network upon cure and therefore are capable of higher heat resistance and plasticizer resistance. Finally, in contrast to water-based technologies, UV curable PSAs offer immediate cure and can be formulated to exhibit much better blushing resistance upon exposure to water. The lack of a need for drying capability is also a significant advantage of UV curable adhesives over water-based technology. Note de contenu : - Market drivers - In-house coating of PSAs - Unique applications - Low VOC - UV curable warm melt adhesives - Room temperature applied UV PSAs - Experimental design techniques - Use of neural networks - Development of room temperature applied PSAs En ligne : https://drive.google.com/file/d/16Xy1FKRQ4JkQJB4aunNXyziUJg8fznaA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20312 [article]

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