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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