Water-resistant latex coatings: tuning of properties by polymerizable surfactant, covalent crosslinking and nanostructured ZnO additive

0541857 - ÚTAM 2022 RIV CH eng J - Journal Article
Machotová, J. - Kalendová, A. - Steinerová, D. - Mácová, Petra - Šlang, S. - Šňupárek, J. - Vajďák, J.
Water-resistant latex coatings: tuning of properties by polymerizable surfactant, covalent crosslinking and nanostructured ZnO additive.
Coatings. Roč. 11, č. 3 (2021), č. článku 347. E-ISSN 2079-6412
Institutional support: RVO:68378297
Keywords : acrylic latex * crosslinking * keto-hydrazide reaction * polymerizable surfactant * ZnO nanoparticles * water resistance * water whitening * antibacterial activity
OECD category: Polymer science
Impact factor: 3.236, year: 2021
Method of publishing: Open access
https://doi.org/10.3390/coatings11030347

This paper deals with the development of acrylic latexes providing high-performance water-resistant coatings. For this purpose, mutual effects of anionic surfactant type (ordinary and polymerizable), covalent intra- and/or interparticle crosslinking (introduced by allyl methacrylate copolymerization and keto-hydrazide reaction, respectively) and ionic crosslinking (provided by nanostructured ZnO additive) were investigated. The latexes were prepared by the standard emulsion polymerization of methyl methacrylate, butyl acrylate and methacrylic acid as the main monomers. The addition of surface-untreated powdered nanostructured ZnO was performed during latex synthesis, resulting in stable latexes comprising dispersed nanosized additive in the content of ca 0.9-1.0 wt.% (based on solids). The coating performance with emphasis on water resistance was evaluated. It was determined that the application of the polymerizable surfactant improved coating adhesion and water-resistance, but it was not able to ensure high water-resistance of coatings. Highly
water-resistant coatings were obtained provided that covalent intra- and interparticle crosslinking together with ionic crosslinking were employed in the coating composition, forming densely crosslinked latex films. Moreover, coatings comprising nanostructured ZnO additive displayed a significant antibacterial activity and improved solvent resistance.
Permanent Link: http://hdl.handle.net/11104/0319364