Epoxy silanes in reactive polymer emulsions / Ming J. Chen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 875 (12/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 875 (12/1997) . - p. 49-55 Titre : Epoxy silanes in reactive polymer emulsions Type de document : texte imprimé Auteurs : Ming J. Chen, Auteur ; Fred D. Osterholtz, Auteur ; Antonio Chaves, Auteur ; Philbert E. Ramdatt, Auteur ; Bruce A. Waldman, Auteur Année de publication : 1997 Article en page(s) : p. 49-55 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Réticulants Réticulation (polymérisation) Revêtements Revêtements -- Additifs Revêtements en phase aqueuse:Peinture en phase aqueuse Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy silanes are effective additives for the crosslinking of carboxy and amino latexes and polyurethane dispersions. A series of epoxy silane additives have been evaluated in both one-pack and two-pack systems. It is found that the structure and water solubility of the epoxysilane as well as the pH of the latex determine silane stability. New water insoluble epoxy silanes achieve long-term shelf stability in emulsions yet crosslink upon application of the coating. Formulating principles, performance improvements, and catalytic cure profiles are reported. Carboxyl-modified waterborne polymer dispersions with post-added epoxy silanes provide curable coatings, in which properties such as mar, chemical and solvent resistance, adhesion, and durability are dramatically improved. In many applications, this approach is a potential candidate for crosslinkable waterborne systems free of aziridines and formaldehyde. Note de contenu : - EXPERIMENTAL : Preparation of a 40% β-(3,4-epoxycyclohexy)ethyltriethoxysilane emulsion - Preparation of a 40% glycidoxypropylmethyldiethoxysilane emulsion - Preparation of epoxysilane/reactive emulsion polymer admixtures - Testing methods - RESULTS AND DISCUSSION : The role of epoxysilane curing in performance improvement - Stable one-pack epoxycyclohexysilane emulsion/reactive latex system - Glycidoxy silanes for two-packs systems - Formulation principles - Wood coating applications - Time-temperature cure profile - Catalytic effects on the cure behavior - Improvement of solvent resistance in polyurethane dispersions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18069 [article]

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Silanes in high-solids and waterborne coatings / Ming J. Chen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 870 (07/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 870 (07/1997) . - p. 43-51 Titre : Silanes in high-solids and waterborne coatings Type de document : texte imprimé Auteurs : Ming J. Chen, Auteur ; Fred D. Osterholtz, Auteur ; Eric R. Pohl, Auteur ; Philbert E. Ramdatt, Auteur ; Antonio Chaves, Auteur ; Valerie Bennett, Auteur Année de publication : 1997 Article en page(s) : p. 43-51 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Haut extrait sec Réticulants Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : Silanes have been used effectively in solvent-based or waterborne coatings to crosslink binder resins, increase pigment dispersion and improve end use properties, such as mar and solvent resistance and durability. A series of silylated styrene acrylic order to have been prepared and studied in order to understand the chemical and physical parameters that influence the mar resistance and weathering properties of the cured coatings. It was found that the silane content affects the indentation hardness, coefficient of friction, modulus, and toughness of the cured coatings. A relationship between these coating characteristics and mar resistance is demonstrated. In water dispersed and emulsion polymer systems, silanes maximize properties, such as adhesion and solvent resistance. Silanes are incorporated into these systems via copolymerization or post addition. Recent advances in waterborne silane technologies are discussed, including methods of improving formulation stability. Note de contenu : - INTRODUCTION : Silanes in high-solids systems - EXPERIMENTAL : Characteristics of silylated acrylic clearcoats - Coating tests - RESULTS AND DISCUSSION : Tensile properties, siloxane crosslinking, and coating properties - Correlation of modulus, friction, and hardness on mar resistance of clearcoats - The influence of difunctional silane ester on clearcoats - Silanes in waterborne systems - EXPERIMANTAL : Preparation of silylated vinyl acrylic latexes - RESULTS AND DISCUSSION : Stable sylilated acrylic and vinyl acrylic latexes - Performance improvements of silylated emulsion polymer coatings - Effects of catalysts in the silylated vinyl acrylic systems - Siloxane crosslinkage of silylated vinyl acrylic films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18261 [article]

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