Preparation and characterization of self-crosslinking acrylate emulsion modified by divinyl silane / Xiaolong Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 887-895 Titre : Preparation and characterization of self-crosslinking acrylate emulsion modified by divinyl silane Type de document : texte imprimé Auteurs : Xiaolong Chen, Auteur ; Shusen Cao, Auteur ; Wangting Zhao, Auteur ; Lijun Chen, Auteur Année de publication : 2022 Article en page(s) : p. 887-895 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate d'hydroxyéthyle Auto-réticulation Caractérisation Emulsifiants Granulométrie Latex Polyacrylates Réticulants en phase aqueuse Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : The divinyl silane modified self-crosslinking polyacrylate latex was successfully prepared by semicontinuous seeded emulsion polymerization. Methyl methacrylate (MMA) and butyl acrylate (BA) were used as main monomers and the reaction was initiated by potassium persulfate (KPS). The modified monomer 1, 3-divinyltetramethyldisiloxane (DVMS) and crosslinked monomer hydroxyethyl acrylate (HEA) were introduced into the basic dispersion. Sodium dodecyl sulfonate (SDS) anionic surfactant and alkyl polyglycoside (APG) nonionic emulsifier were utilized as composite emulsifiers. The structure of latex film was characterized by Fourier transform infrared spectroscopy (FTIR). The latex films were tested by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and contact angle (CA) and apparent crosslinking percentage. The particle size of the emulsion was measured by Zetatrac dynamic light scattering instrument. The optimum conditions are as follows: the amount of composite emulsifier is 5.0%, the mass ratio of SDS to APG is 1:1, the amount of initiator is 0.5%, the amount of DVMS is 5.0%, and the amount of HEA is 1.0%. The emulsion has good mechanical stability and chemical stability, and the storage stability is ideal. The dispersion is blue and translucent, with a small particle size. The apparent crosslinking percentage of the latex film is above 89%, and the highest contact angle was more than 98°. The polyacrylate colloidal film prepared in this paper has outstanding thermal stability and hydrophobicity. Note de contenu : - EXPERIMENTAL : Materials - Preparation of self-crosslinking acrylic latex and its film - Characterizations - RESULTS AND DISCUSSION : FTIR and DSC film analysis of the films - Influence of amount of initiator on conversion percentage and coagulation percentage - The effect of functional monomers on the apparent crosslinking percentage - Water absorption and contact angle of film - Thermal properties of the prepared latex films - Table 1 : Recipe of self-crosslinking acrylic latex - Table 2 : Influence of mass ratio of emulsifier on properties of latex - Table 3 : Particle size of latex DOI : https://doi.org/10.1007/s11998-021-00566-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00566-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38083 [article]

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