Crosslinked polyurethane–epoxy hybrid emulsion with core–shell structure / Wen Xiufang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 3 (05/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 3 (05/2010) . - p. 373-381 Titre : Crosslinked polyurethane–epoxy hybrid emulsion with core–shell structure Type de document : texte imprimé Auteurs : Wen Xiufang, Auteur ; Ruilian Mi, Auteur ; Huang Ying, Auteur ; Jiang Cheng, Auteur ; Pi Pihui, Auteur ; Zuohru Yang, Auteur Année de publication : 2010 Article en page(s) : p. 373-381 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Polyuréthanes Réticulation (polymérisation) Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : An epoxy resin was used to prepare crosslinked polyurethane hybrid emulsion through the blocked NCO prepolymer mixing process. Due to their hydrophobicity, the amine chain extender, blocked –NCO, and epoxy are located inside the emulsion particles. Thus, the crosslinking reaction occurs mostly in the interior of the particles. In this way, the crosslinking density of the resin is increased without the use of solidifying agents or heating during film formation, and the stability of the emulsions remains uninfluenced. The effects of the type of amine chain extender and the type, dosage, and addition mode of the epoxy resin were studied in terms of mechanical properties and swelling properties in water and toluene of the cast films. Additionally, the stability of the single-pack hybrid emulsion was studied. The results showed that the sample prepared with diethylene triamine had good stability, chemical resistance, and high mechanical strength. The modulus and water resistance of the films increased with the epoxy resin content, which could reach 20 wt %. The type of amine chain extender affected the stability of the emulsions significantly. The molar ratio of NH/NCO at 1:1 led to the best film performance. The optimal temperature of the chain-extension reaction was approximately 80°C. The hybrid emulsions could be stored for at least 6 months without apparent performance changes. DOI : 10.1007/s11998-009-9196-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9196-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9816 [article]

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Flooding and floating in latex paint / Huang Ying in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 3 (07/2004)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 3 (07/2004) . - p. 213-218 Titre : Flooding and floating in latex paint Type de document : texte imprimé Auteurs : Huang Ying, Auteur ; Jiang Cheng, Auteur ; Wen Xiufang, Auteur ; Yang Zhuoru, Auteur Année de publication : 2004 Article en page(s) : p. 213-218 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Applications extérieures Latex Revêtement mural:Peinture murale Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits Résumé : Flooding and floating are problems in many paint applications. If pigment concentration is uniform on the surface but not through the thickness of the film, one refers to 'flooding' (horizontal separation). If, however, concentration differences are visible across the surface of the paint film, one refers to 'floating' (vertical separation). In this article, the influence of pigment, filler, additives, and processing conditions on the flooding and floating of colored latex paint were investigated. It was discovered that too broad a distribution of pigment and filler particle size can lead to flooding and floating. Different levels of pigment (TiO2) or filler (kaolin) loading cause diverse degrees of flooding and floating. Waterborne coatings that do not exhibit flooding or floating may show these conditions when diluted. Using dispersants or thickeners with hydrophobic constituents, increasing viscosity, reducing surface tension, etc., all help to prevent or reduce flooding and floating. Comparison tests revealed little influence of processing conditions on flooding or floating. DOI : 10.1007/s11998-004-0014-2 En ligne : https://link.springer.com/article/10.1007/s11998-004-0014-2 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3901 [article]

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Preparation and characterization of ambient-temperature self-crosslinkable water-soluble acrylic resin for PE film ink / Pi-Hui Pi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 1 (01/2016) . - p. 73-80 Titre : Preparation and characterization of ambient-temperature self-crosslinkable water-soluble acrylic resin for PE film ink Type de document : texte imprimé Auteurs : Pi-Hui Pi, Auteur ; Xi Chen, Auteur ; Wen Xiufang, Auteur ; Shouping Xu, Auteur ; Jiang Chen, Auteur Année de publication : 2016 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Adipique dihydrazide, Acide L'acide dihydrazide adipique (ADH) est un produit chimique utilisé pour la réticulation à l'eau des émulsions . Il peut également être utilisé en tant que durcisseur pour certains résines époxydes. L'ADH est une molécule symétrique avec un squelette C4 et le groupe réactif est C = ONHNH 2. Les dihydrazides sont fabriqués par la réaction d'un acide organique avec de l'hydrazine . Il existe d'autres dihydrazides avec différents squelettes, également fréquents, y compris isophtalique dihydrazide (IDH) et dihydrazide sébacique (SDH). Copolymère diacétone acrylamide Couches minces Polyacryliques Polyéthylène Polymères -- Synthèse Polymères hydrosolubles Réticulation (polymérisation) Index. décimale : 667.9 Revêtements et enduits Résumé : An ambient-temperature self-crosslinkable acrylic resin was synthesized by solution polymerization, with ethanol as solvent; butyl acrylate (BA), methyl methacrylate (MMA), acrylic acid (AA), hydroxypropyl acrylate (HPA), and diacetone acrylamide (DAAM) as monomers; and adipic acid dihydrazide (ADH) as crosslinker. The resin could be diluted by water. The resin was used for PE film ink, and its curing behavior and film properties were studied. FTIR and DSC results indicated that the reaction between ketone carbonyl and hydrazine groups could occur during film curing at ambient temperature and improved glass transition temperature (T g) of the film by 12.67°C. Crosslinking density of film increased with DAAM content and m(ADH)/m(DAAM) ratio. Adhesion on PE film increased with DAAM content, while it first increased then decreased with m(ADH)/m(DAAM) ratio. Water absorption of film decreased with DAAM content, while it first decreased then increased with m(ADH)/m(DAAM) ratio. The optimal m(ADH)/m(DAAM) ratio and DAAM content in this experiment are 0.8:1 and 2%, respectively. Compared with ambient-temperature self-crosslinkable emulsion, this water-soluble resin shows film not only with the same adhesion, but also without any shrinkage void, indicating better film-forming ability on PE film. The ambient-temperature self-crosslinkable water-soluble acrylic resin shows excellent potential application in water-based ink for PE film because of good film-forming ability and adhesion and low water absorption. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of ambient-temperature self-crosslinkable acrylic resin - Preparation of ink film - Characterization - RESULTS AND DISCUSSION : FTIR spectra analysis - DSC analysis - GPC analysis - Influence of DAAM content on the properties of films - Influence of ADH/DAAM ratio on the properties of films - Influence of surface tension of PE film - Curing temperature and time DOI : 10.1007/s11998-015-9742-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9742-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25377 [article]

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Synthesis and characterization of fluorine-containing poly-styrene-acrylate latex with core–shell structure using a reactive surfactant / Guilong Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 3 (05/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 3 (05/2011) . - p. 401-407 Titre : Synthesis and characterization of fluorine-containing poly-styrene-acrylate latex with core–shell structure using a reactive surfactant Type de document : texte imprimé Auteurs : Guilong Xu, Auteur ; Lili Deng, Auteur ; Wen Xiufang, Auteur ; Pi Pihui, Auteur ; Dafeng Zheng, Auteur ; Jiang Cheng, Auteur ; Yang Zhuoru, Auteur Année de publication : 2011 Article en page(s) : p. 401-407 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère styrène acrylique Core-Shell Fluorine Latex Surfactants réactifs Index. décimale : 667.9 Revêtements et enduits Résumé : Fluorine-containing poly-styrene-acrylate (PSA) latex with core–shell structure was successfully synthesized by seeded semicontinuous emulsion polymerization using fluorine monomer Actyflon-G04 and reactive emulsifier DNS-86. The chemical composition, morphology of latex, and surface composition of the latex film were characterized by Fourier transform infrared spectra, transmission electron microscopy, and X-ray photoelectron spectroscopy, respectively. The stability properties of latex were tested by Ca2+, centrifugal and mechanical stability tests, and the latex film was studied by water contact angle, water absorption ratio, and thermo-gravimetric analysis. The results show that fluorine-containing PSA latex particles with crosslinked core and crosslinked shell structure have excellent stability properties, and the film of latex has excellent water repellency, thermal stability, and chemical resistance properties when the amount of fluorine monomer was only 8.0 wt %. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the fluorine-containing PSA latex latex nanoparticles with core-shell structure - Characterization. - RESULTS AND DISCUSSION : FTIR analysis - Effect of crosslinking - Micromorphology of the core-shell latex nanoparticles - XPS analysis - Stability of the prepared latex - Water repellency and chemical resistance properties of the latex film - Thermal stability of the prepared latex film. DOI : 10.1007/s11998-010-9308-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9308-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11679 [article]

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