Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness / Daidong Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 415-428 Titre : Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness Type de document : texte imprimé Auteurs : Daidong Wei, Auteur ; Bing Liao, Auteur ; Qiwen Yong, Auteur ; Huiyi Wang, Auteur ; Tao Li, Auteur ; Jianheng Huang, Auteur ; Hao Pang, Auteur Année de publication : 2019 Article en page(s) : p. 415-428 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère uréthane acrylate Dureté (matériaux) Formulation (Génie chimique) Huile de ricin et constituants Humidité -- Absorption:Eau -- Absorption Polyesters Polymères -- Synthèse Polymères en émulsion Résistance chimique Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements en phase aqueuse Rhéologie Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Synthesis, characterization, and coating performance of castor oil (CO)-based waterborne hyperbranched polyurethane acrylate (WHPUA) emulsions are highlighted in this work. Herein, a second-generation CO-based hyperbranched polyester (C20) was synthesized by introducing the renewable CO as a B3 core and dimethylolpropionic acid as an AB2 monomer via a pseudo-one-pot condensation procedure. Three types of CO-based WHPUA emulsions were prepared through the addition of the hyperbranched C20 with maleic anhydride (MA) and the isocyanate-bearing semiadduct (IPDI-HEA) at different MA/IPDI-IH molar ratios without the addition of any emulsifiers. The prepared emulsions were further formulated into UV-curable coating formulations and exposed to a medium-pressure mercury lamp. Consequently, the obtained UV-cured coatings exhibited outstanding adhesion performance, excellent transparency, and an acceptable degree of final double bond conversion. Owing to a relatively low concentration of hydrophilic units and a large number of acrylate functionalities in the waterborne oligomer, the obtained films were endowed with high crosslinking density and low hydrophilic nature, thus producing enhanced tensile strength, pencil hardness, water resistance, and chemical resistance. Due to their combination of renewable materials, a waterborne system and a UV-curing technique, these CO-based WHPUA emulsions offer promising opportunities to be used as environmentally friendly coatings. Note de contenu : - EXPERIMENTAL : Materials - Materials - Synthesis of the second-generation hyperbranched polyester (C20) - Synthesis of the CO-based WHPUA emulsions (WCM&.5I8.5s WCM2I88, and WCM2.4I7.5) - UV-curable coating formulations and UV-curing - Characterization - RESULTS AND DISCUSSION : Synthesis and structure characterization - Appearance, stability, viscosity, and particle diameter distribution - Rheological behavior - Curing kinetics and boule bond conserson - Mechanical properties and performance of the UV-cured coatings - Gel content and water absortion of the UV-cured films - Chemical resistance of the UV-cured films - Thermal properties and transparency of the UV-cured films - COMPLIANCE WITH ETHICAL STANDARDS DOI : 10.1007/s11998-018-0120-1 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32413 [article]

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Structure and surface properties of a novel bulk-matte waterborne polyurethane coating composite / Qiwen Yong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 993-1002 Titre : Structure and surface properties of a novel bulk-matte waterborne polyurethane coating composite Type de document : texte imprimé Auteurs : Qiwen Yong, Auteur ; Bing Liao, Auteur ; Guo Ying ; Liang Caizhen ; Hao Huang ; Hao Pang Année de publication : 2018 Article en page(s) : p. 993-1002 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Epoxydes Matité État de ce qui est mat : La matité d'un son, d'une couleur. (Larousse) Polymères réticulés Polyuréthanes Réaction de couplage Revêtements en phase aqueuse Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : This paper reports on a novel self-matte or bulk-matte waterborne polyurethane coating composite with inherently extremely low gloss. The coating composite was comprised of a siloxane-containing waterborne polyurethane (SPU) resin and a crosslinked waterborne polyurethane (CPU) resin. The CPU resin was mainly responsible for fabricating the micro-rough surface of the film, which was achieved by a crosslinking reaction between the waterborne polyurethane and bisphenol A-type epoxy E-44 resin. The SPU resin was used to improve the comprehensive properties of the film, which was ascribed to the addition of silane coupling agent KH792. Compared with traditional matte coatings, this coating composite made it possible to avoid high loadings of matting agent and to arrive at highly flexible low-gloss finishes. Gloss levels of as low as a few tenths of a percent, even at high incidence angles, have been achieved with zero loading of extraneous dulling agent. The chemical structures of the SPU and CPU resins were characterized by FTIR-ATR and NMR spectra. The micro-rough topographies and surface rough degrees of the SPU, CPU and their 50%/50% composite films were measured by SEM and MSP, respectively. The particle sizes and particle morphologies of the SPU and CPU resins were imaged by TEM. Finally, the comprehensive properties of the SPU, CPU and their 50%/50% composite resins were evaluated, including the water contact angle, film transparency, tensile strength and storage stability. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the siloxane-containing waterborne polyurethane (SPU) resin - Synthesis of the crosslinked waterborne polurethane (CPU) resin - Preparation of the individual SPU, CPU and composite films - Characterization - RESULTS : Chemical structural characterization - Particle morphology observation - Film surface analysis - Films transparency - Film tensile property - Water contact angle - Physical properties DOI : 10.1007/s11998-017-0030-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0030-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31123 [article]

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